C. K. Campbell Publications - Alloy to Z-Transform

COLIN KYDD CAMPBELL - FOR PERIOD FROM 1953

BOOKS, PATENTS , PATENTS PENDING, JOURNALS, AND CONFERENCE PUBLICATIONS:
ELECTRICAL ENGINEERING AND PHYSICS COVERAGE - "ALLOY TO Z-TRANSFORM"

(Most recent first. Theses are listed at end)

ALSO SEE MY MAIN SAW WEB PAGE AT

http://www3.sympatico.ca/colin.kydd.campbell/

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KEY WORDS INCLUDE: - Alloy, Amplifier, Antenna, Array, Barium titanate, Barker codes, Binary phase-shift keying, Biolayer, Biosensor, Biosensing, Bulk wave, Capacitor, Ceramic, Charge coupled device, Communications, Conductance, Convolver, Delay line, Dielectric, Diode, Electromagnet, Electron beam lithography, Energy gap, Ferrite, Ferroelectricity, Filter, Fluidic chamber, FM discriminator, Harmonic, High voltage, IDT, Interconnects, Interferometer, Laser, Leaky SAW, Lithium niobate, Log periodic, Maser, Microwave, Millimeter wave, Minicomputer, Mobile radio, Multipath, Neural, Oscillator, Paramagnetic cooling, Patent, Permeability, Phase noise, Piezoelectric, Power electronics, Quadraphase codes, RC filter, Reflector, Remez algorithm, Resonator, Resonator-filter, RFID, SAW, Scanning microscope, Schottky, Semiconductor, Sensor, Spread spectrum, Strip line, Superconductivity, Surface acoustic wave, Thin film, Transducer, Tunneling, Transmission line, Waveguide, Wireless, Z-transform.

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UNITED STATES PATENT

Patent Number: US 7,158,763

Date of Patent: January 2, 2007:
Title: "MULTI-IDT SAW HYBRID COMMUNICATION SYSTEM"

Inventors: Edmonson; Peter J. (Hamilton, CA), Campbell; Colin K. (Ancaster, CA)
Assignee: P. J. Edmonson Ltd. (Hamilton, CA)

Appl. No.: 10/428,094
Filed: May 2, 2003

ABSTRACT:
"A SAW communication device has a main IDT mounted on an SAW substrate to receive an RF signal received by an antenna and convert the RF signal to an acoustic wave which travels along the SAW substrate in opposite directions from the main IDT. At least two secondary IDTs are mounted on the SAW substrate on opposite sides of and spaced from the main IDT to receive and reflect the acoustic wave in a modulated form such that the modulated acoustic wave from one secondary IDT is delayed relatively to the modulated acoustic wave from a secondary IDT on the opposite side of the main IDT to the one secondary IDT. The main IDT is also operable to receive and convert the reflected modulated acoustic waves to a further RF signal with a concatenated waveform corresponding to the two modulated acoustic waves and transmit the further RF signal from the antenna."

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UNITED STATES PATENT:

Patent Number: US 7,053,524 B2
Date of Patent: May 30, 2006
Title "SURFACE ACOUSTIC WAVE SENSOR OR IDENTIFICATION DEVICE WITH BIOSENSING CAPABILITY"

Inventors: Edmonson; Peter J. (Hamilton, CA), Campbell; Colin K. (Ancaster, CA), Hunt; William D. (Decatur, GA)
Assignee: P.J. Edmonson Ltd. (Hamilton, CA)

Appl. No.: 11/139,477
Filed: May 31, 2005

ABSTRACT:
"A surface acoustic wave sensor or identification device has a piezoelectric material, and an interdigital transducer (IDT) input/output mounted on the piezoelectric material for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the piezoelectric material. An IDT finger electrode array is mounted on the piezoelectric material and is operable to communicate with the IDT input/output for transmission of a modified RF signal from the device. The IDT finger electrode array has at least one finger electrode segment whose propagating characteristics are controlled to control the nature of the modified RF signal. A biolayer is mounted on the piezoelectric material and is associated with the finger electrode segment, and a fluidic chamber is associated with the biolayer. In use, the fluidic chamber contains fluid which, if a predetermined substance to be sensed or detected is present, operates to modify the biolayer which in turn controls the nature of the modified RF signal."
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UNITED STATES PATENT

Patent Number: US 7,005,964 B2
Date of Patent: February 28, 2006:
Title: "DUAL TRACK SURFACE ACOUSTIC WAVE RFID SENSOR"

Inventors: Peter J. Edmonson and Colin K. Campbell
Assignee: P. J. Edmonson Ltd

ABSTRACT:
"A SAW RFID tag or sensor has an antenna for receiving and propagating an RF signal, an input/output IDT electrically connected to the antenna, and a dual track reflective IDT having a first track and a second track located adjacent and acoustically coupled to the input/output IDT. An RF signal received from the antenna by the input/output IDT is transformed by the input/output IDT into an acoustic way which is propagated to the dual track IDT. One track of the dual track IDT is in-phase with the phase reference of the input/output IDT and the other track is in quadrature phase with said phase reference. The input/output IDT receives two orthogonal complex modulated acoustic waves reflected from the first and second tracks and transforms them to a modulated orthogonal complex RF signal which is propagated from the antenna. "

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UNITED STATES PATENT:

Patent Number: US 6,967,428
Date of Patent: November 22, 2005
Title: "SELECTABLE REFLECTOR ARRAYS FOR SAW SENSORS AND IDENTIFICATION DEVICES"

Inventors: Edmonson; Peter J. (Hamilton, CA), Campbell; Colin K. (Ancaster, CA)
Assignee: P. J. Edmonson Ltd. (Hamilton, CA)

Appl. No.: 10/729,920
Filed: December 9, 2003

ABSTRACT:
"A surface acoustic wave sensor or identification device has a piezoelectric substrate, an interdigitated transducer (IDT) input/output mounted on a substrate for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the substrate. An IDT reflector array is mounted on the substrate and operable to receive a surface acoustic wave and reflect the surface acoustic wave in modified form back to the IDT input/output for transmission of a corresponding modified RF signal from the device. The IDT reflector array has at least one reflector segment whose reflectivity characteristics are controlled to control the nature of the modified RF signal."

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UNITED STATES PATENT:

Patent Number: US 6,827,281 B2
Date of Patent: December 7, 2004

Title: "ENCODED SAW RFID TAGS AND SENSORS FOR MULTI-USER DETECTION USING IDT FINGER PHASE MODULATION"

Inventors: Edmonson; Peter J. (Hamilton, CA), Campbell; Colin K. (Ancaster, CA)
Assignee: P. J. Edmonson Ltd. (Hamilton, CA)

Appl. No.: 10/323,827
Filed: December 20, 2002

ABSTRACT:
"A group of SAW RFID tags or sensors each has a transducer with interdigitated fingers, a different set of fingers in each tag or sensor to provide a unique identifier in a returned impulse response produced by the tag or sensor when interrogated by an interrogation signal."
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UNITED STATES PATENT:

Patent Number: 5,825,794
Date of Patent: November 30, 2004
Title: "WIRELESS COMMUNICATION SYSTEM USING SURFACE ACOUSTIC WAVE (SAW) SECOND HARMONIC TECHNIQUES"

Inventors: Edmonson; Peter J. (Hamilton, CA), Campbell; Colin K. (Ancaster, CA)
Assignee: Research In Motion Limited (Waterloo, CA)

Appl. No.: 09/863,944
Filed: May 23, 2001

ABSTRACT:
SAW devices such as interdigital transducers (IDTs) have been widely used in RADAR applications and as filters. An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communication device. However, internal dimensions of IDTs are inversely proportional to operating frequency, such that high frequency IDTs present significant manufacturing difficulties. Fabrication of IDTs for high frequency applications is simplified by exploiting a harmonic frequency SAW generated by IDTs. An IDT may therefore be designed according to fundamental frequency internal dimension criteria but can operate at a multiple of the fundamental frequency, thereby providing much higher frequency operation than conventional SAW systems. A communication system based on SAW harmonic techniques would be low-cost, low-power, small and simple alternative to known short range communications schemes, including for example the Bluetooth.TM. solution. Operation of a second harmonic SAW system at 2.4 GHz based on a fundamental frequency of 1.2 GHz is contemplated.

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UNITED STATES PATENT:

Patent Number: US 6,462,698
Date of Patent: October 8,2002

Title: WIRELESS COMMUNICATION SYSTEM USING SURFACE ACOUSTIC WAVE (SAW) SINGLE-PHASE UNIDIRECTIONAL TRANSDUCER (SPUDT) TECHNIQUES"

Inventors: Colin K. Campbell (Ancaster, CA) and Peter J. Edmonson (Hamilton, CA)

Assignee: Research in Motion Limited ( Waterloo, CA)

Appl. No.: 09/864,507

Filed: May 24, 2001

ABSTRACT:

SAW devices such as interdigital transducers (IDTs) have been widely used in RADAR applications and as filters. An IDT produces a SAW when excited by a single electrical pulse and can be fabricated to embody a code, which code provides for a passive autocorrelation of a SAW input to the IDT and thereby lends itself to further application as a signal generator in a communication device. However, conventional SAW expanders and compressors typically have insertion losses greater than 20 dB, which can have a profound effect on an RF link budget in a communication system. Insertion losses are drastically reduced by using a single phase unidirectional transducer (SPUDT-type) instead of a conventional IDT as a SAW expander/compressor. A SPUDT-type reflects SAW components which are lost in conventional IDT designs so that a stronger SAW is directed toward a transmission element. In a receiver, a SPUDT-type directs a stronger SAW toward a compressor IDT. A communication system based on SPUDT-type techniques would be low-cost, low-power, small and simple alternative to known short range communications schemes, including for example the BLUETOOTH.TM. solution. Operation of a SAW system at a frequency of 2.4 GHz is contemplated.

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UNITED STATES PATENT:

Patent Number: US 6,570,462
Date of Patent: May 27, 2003

Title: "ADAPTIVE TUNING DEVICE AND METHOD UTILIZING A SURFACE ACOUSTIC WAVE DEVICE FOR TUNING A WIRELESS COMMUNICATION DEVICE"

Inventors: Edmonson; Peter J. (Hamilton, CA), Campbell; Colin K. (Ancaster, CA)
Assignee: Research In Motion Limited (Waterloo, CA)

Appl. No.: 09/867,189
Filed: May 29, 2001

ABSTRACT:
An adaptive tuning method for a wireless communication device determines the impedance of a matching circuit relative to an impedance to be matched and adjusts the impedance of the matching circuit accordingly. A passive surface acoustic wave (SAW) device includes multiple terminated interdigital transducers (IDTs) which generate reflected SAWs when excited by incident SAWs, each reflected SAW having magnitude and phase characteristics dependent upon the particular IDT termination. According to the invention, the IDT terminations include the impedance matching circuit and the impedance to be matched. Input IDTs in the SAW device are excited with electrical signals, which are converted to generate the incident SAWs. The resultant reflected SAWs are converted by output IDTs into output electrical signal signals which can then be analyzed to determine magnitude and phase differences between the output electrical signal signals and generate an impedance matching circuit control signal based thereon.

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UNITED STATES PATENTS PENDING

Inventors: Peter J. Edmonson and Colin K. Campbell:
Application Number: 20030016735:
Filing Date: July 23, 2001.
Title: COMMUNICATION SYSTEM FOR TWO-WAY EXCHANGE OF INFORMATION

ABSTRACT:
"A communication system for two-way exchange of information using a binary coded waveform has a base unit operable to transmit and receive electromagnetic radiation waveforms modulated by binary coded voice or data message signals, and a hybrid unit remote from the base unit and operable to receive and transmit binary coded electromagnetic radiation waveforms from and to the base unit. The hybrid unit has a first surface acoustic wave device with an input to receive a binary coded electromagnetic radiation waveform from the base unit and cause a corresponding binary coded surface acoustic wave to travel from the input to an output thereof and be reflected back to the input. A first transducer is connected to the output to receive further information from a source thereof and modify the reflected surface acoustic waveform, whereby the reflected surface acoustic waveform incorporates such further information and becomes a modified reflected surface acoustic waveform which travels to the input and then travels as a modified binary coded electromagnetic waveform to the base unit. "
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CANADIAN PATENT

Canadian Patent No: 922813:
Date of Patent: March 13, 1973.
Inventors: Colin K. Campbell and Pieter L. Swart,\
Title: VOLTAGE-CONTROLLED TUNABLE DISTRIBUTED RC FILTER

ABSTRACT:
"This invention relates to a tunable distributed RC filter, and the like, and more particularly to a voltage-controlled distributed RC filter utilizing a semiconductor sandwiched between insulating and conductive materials. Such device has application to a voltage-controlled tunable distributed low-pass filter, high-pass notch filter attenuator, a voltage-controlled distributed RC notch filter amplifier, and the like."

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BOOKS:

Colin Campbell, "Surface Acoustic Wave Devices for Mobile and Wireless Communications," Academic Press: Boston, 631 pages, 1998.

Colin Campbell, "Surface Acoustic Wave Devices and Their Signal Processing Applications," Academic Press: Boston, 475 pages, 1989.

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JOURNAL AND CONFERENCE PUBLICATIONS:

125. C. K. Campbell, J. D. van Wyk, R. Chen, "Effect of current crowding on frequency response of a stepped planar RF transmission-line lowpass filter for power electronics," IEEE Trans. on Advanced Packaging, vol. 29, pp. 798-803, November 2006

124. J. D. van Wyk Jr, W. A. Cronje, J. D. van Wyk, C. K. Campbell, P. J. Wolmarans, "Power electronic interconnects: skin- and proximity effect-based frequency selective multipath propagation," . IEEE Trans. on Power Electronics, vol. 20, pp. 600-610, May 2005.

123. C. K. Campbell, J. D. van Wyk, P. Wolmarans, "Improved transmission-line attenuators for integrated power filters in the RF band," . IEEE Trans. on Components and Packaging Technologies, vol. 27, June 2004.

122. P. J. Wolmarans, J. D. van Wyk, J. D. van Wyk jr, C. K. Campbell, "Technology for integrated RF-EMI transmission line filters for integrated power modules," IEEE Industry Applications Society Meeting, Pittsburgh, Pennsylvania, October 2002 .(WINNER OF "WILLIAM M. PORTNOY" AWARD FROM IEEE INDUSTRY APPLICATIONS SOCIETY, FOR YEAR 2002).

121. C. K. Campbell and P. J. Edmonson "An empirical method for obtaining the harmonic response coefficients of a SAW interdigital transducer," 2002 IEEE Ultrasonics Symposium, Munich, Germany, vol. 1, pp. 283-287, October 2002, .

120. J. D. van Wyk, Jr., W. A. Cronje, J. D. van Wyk, P. Wolmarans, C. K. Campbell, "Integrated power filters utilizing skin- and proximity effect based low-pass interconnects," Second International Conference on Integrated Power Systems (CIPS 2002), Bremen, Germany, June 2002.

119. C. K. Campbell, J. D. van Wyk, R. Chen, "Experimental and theoretical characterization of an antiferroelectric ceramic capacitor for power electronics," IEEE Trans. on Components and Packaging Technologies, vol. 25, June 2002. (WINNER OF IEEE "BEST PAPER AWARD" FOR YEAR 2002).

118. J. T. Strydom, J. D. van Wyk, C. K. Campbell, J. A. Ferreira, M. F. K. Holm, "Packaging of an integrated planar power passive module for a power electronics converter: a 1 MHz case study," IEEE Trans. on Components and Packaging Technologies, vol. 25, June 2002.

117. Colin K. Campbell, "SAW devices satisfy varied wireless system needs," Applied Microwave and Wireless, vol. 14, No. 3, pp. 24-36, March 2002

116. C. K. Campbell and P. J. Edmonson, "Modeling a longitudinally coupled dual-mode leaky-SAW resonator filter with enhanced upper-sideband suppression," IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 48, pp. 1298-1301, September 2001. .

115. J. D. van Wyk, C. K. Campbell, and J. T. Strydom, "Integrated resonators for power electronics: An example and some material requirements," Passive Components for Power Electronics Workshop, Penn State University, April 26-27 2000.

114. C. K. Campbell and P. J. Edmonson, "Conductance measurements on a leaky-SAW harmonic one-port resonator," IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 47, pp. 111-116, January 2000.

113. C. Campbell, "One-port leaky-SAW resonators: building blocks for low-loss RF front-end systems," RF Design, pp. 22-28, October 1999.

112. P. J. Edmonson and C. K. Campbell "Effect of stray coupling on the balance of a differential LSAW front-end resonator filter for wireless/mobile circuits," 1999 IEEE Ultrasonics Symposium, Lake Tahoe, Nevada, Oct. 1999, vol. 1, pp. 361-364.

111. C. K. Campbell, "Surface acoustic wave convolvers for spread-spectrum mobile and wireless communications," 1999 International Symposium on Electromagnetic Compatibility, Tokyo, Japan, May 17-21 1999, pp. 686-689.

110. C. K. Campbell, "Obtaining the fundamental and harmonic radiation conductances of a reflective SAW interdigital transducer," 1998 IEEE Ultrasonics Symposium, Sendai, Japan, Oct. 5-8, 1998, pp. vol. 1, 169-173.

109. C. K. Campbell, "Beneficial effect of diffraction on the frequency response of a 250-MHz SAW mobile IF resonator-filter with long IDTs and triple longitudinal modes on quartz," 1998 IEEE Ultrasonics Symposium, Sendai, Japan, Oct. 5-8, 1998, vol. 1, pp. 159-163.

108. C. K. Campbell, J. D. van Wyk, and M. F. K. Holm, "Development of large-area BaTiO3 ceramics with optimized depletion regions as dielectrics for planar power electronics," IEEE Trans. on Components, Packaging and Manufacturing Technology - Part A, vol. 21, pp. 492-498, Sept. 1998,

107. C. K. Campbell and P. J. Edmonson, "Operation of a SAW reflection grating at harmonic frequencies," 1997 IEEE Ultrasonics Symposium, Toronto, Canada, 5-8 Oct. 1997 vol. 1, pp. 5-9.

106. J. D. van Wyk, C. K. Campbell, and M. F. K. Holm, "Dielectric ceramic technology for high power integrated hybrid converters," 7th European Conference on Power Electronics and Applications, Trondheim, Norway, Sept. 1997.

105. C. K. Campbell, "Observations of the frequency response of a leaky-SAW reflection grating," Progress in Electromagnetics Research Symposium (PIERS 1997), Cambridge, Massachusetts, July 1997.

104. C. K. Campbell, J. D. van Wyk, and M. F. K. Holm, "Improving the frequency response of ceramic dielectrics for high power applications in power electronic converters," IEEE Trans. on Components, Packaging, and Manufacturing Technology -- Part A, vol. 19, pp. 508-515, Dec. 1996.

103. C. K. Campbell, "Longitudinal-mode leaky SAW resonator-filters on 64^o Y-X lithium niobate," IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 42, pp. 883-888, Sept. 1995.

102. C. K. Campbell, "Applications of surface acoustic wave and pseudo surface acoustic wave devices for mobile/wireless communications," Proc. 150th Committee of Japan Society for the Promotion of Science, Tokyo, Japan, pp. 17-23, May 1995, (Invited Paper).

101 C. K. Campbell, "Admittance parameter modelling of a dual longitudinal mode RF leaky SAW resonator filter for mobile communication," Proc. of Technical Meeting of Institute of Electronics, Information and Communication Engineering, Chiba University, Japan, pp. 43-48, 27 June 1995. (Invited Paper).

100. C. K. Campbell, J.D. van Wyk and M. F. K. Holm, "Observations on competing mechanisms governing the C-V response of nonlinear ceramic capacitors," IEEE Trans. on Components, Hybrids, and Manufacturing Technology, vol. 18(1), Pt. A, pp. 226-229, March 1995.

99. P. J. Edmonson and C. K. Campbell, "Radiation conductance and grating reflectivity weighting parameters for dual mode leaky-SAW resonator filter design," 1994 IEEE Ultrasonics Symposium, Cannes, France, 1-4 Nov. 1994, vol. 1, pp. 75-79.

98. C. K. Campbell, "Scattering and transmission analysis of SAW resonator-filters with long-pair IDTs and triple composite longitudinal modes on quartz," 1994 IEEE Ultrasonics Symposium, Cannes, France, 1-4 Nov. 1994, vol. 1, pp. 309-312.

97. P. J. Edmonson, C. K. Campbell and P.M. Smith, "Periodic pulse generator employing a driven unlocked surface acoustic wave oscillator," Electronics Letters, vol. 30, pp. 1101-1103, June 1994.

96. P. J. Edmonson, P.M. Smith and C. K. Campbell, "SAW injection locked oscillators: dynamic behaviour and application to neural networks," 1993 IEEE Ultrasonics Symposium, Baltimore, Maryland, 31 Oct.-3 Nov., vol. 1, pp. 131-135, 1993.

95. C. K. Campbell, "A new method for obtaining the harmonic response coefficients of a SAW interdigital transducer," Acoustoelectronics'93: 6th Conference with International Participation, Varna, Bulgaria, September 1993 (Invited paper).

94. C. K. Campbell, J.D. van Wyk, M. F. K. Holm, J. J. R. Prinsloo, J. J. Schoeman, "Relaxation effects in high-voltage barium titanate nonlinear ceramic disk capacitors," IEEE Trans. on Components, Hybrids and Manufacturing Technology, vol. 16, pp. 418-423, June 1993.

93. C. K. Campbell, "SAW resonators and oscillators," Proc. International Conference on SAW Devices for Mobile Communications, Sendai, Japan, 3-5 December 1992, pp. 171-178 . (Invited Paper).

92. C. K. Campbell, P.M. Smith and P. J. Edmonson, "Aspects of modelling the frequency response of a two-port waveguide-coupled SAW resonator filter," IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 39, pp. 768-771, November 1992.

91. C. K. Campbell, P. J. Edmonson and P.M. Smith, "Transverse modes in one-port SAW resonators," IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 39, pp. 785-787, November 1992.

90. P. J. Edmonson, P.M. Smith and C. K. Campbell, "SAW-based carrier recovery without phase ambiguity for 915 MHz BPSK wireless digital communications," Proc. 1992 IEEE Ultrasonics Symposium, Tucson, AZ, 20-23 Oct. 1992, vol. 1, pp. 241-244.

89. C. K. Campbell, P. J. Edmonson and P.M. Smith, "Effect of saturation on the one-sided beat spectrum of a driven unlocked oscillator," Electronics Letters, vol. 28, pp. 1121-1122, 4 June 1992.

88. P. J. Edmonson, P.M. Smith and C. K. Campbell, "A SAW based carrier recovery scheme for a 915 MHz BPSK Wireless System," Proc. 16th Biennial Symposium on Communications, Queen's University, Kingston, Ontario, May 1992.

87. P. J. Edmonson, P.M. Smith and C. K. Campbell, "Injection-locking techniques for a 1 GHz digital receiver using acoustic wave devices," IEEE Trans. on Ultrasonics, Ferroelectrics, and Frequency Control, vol. 39, pp. 631-637, September 1992.

86. J. J. R. Prinsloo, J.D. van Wyk, R. Swanepoel, M. F. K. Holm and C. K. Campbell, "Manufacture, behaviour and modelling of BaTiO3 nonlinear ceramic disc capacitors for high voltage applications," Proc. 2nd Electronic Components and Technology Conference (ECTC), San Diego, California, 18-20 May 1992.

85. C. K. Campbell, J.D. van Wyk, M. F. K. Holm, J. J. R. Prinsloo, J. J. Schoeman, "Steady-state and transient response of a high-voltage nonlinear barium titanate ceramic-disc power-snubber capacitor," Proc. 2nd Electronic Components and Technology Conference (ECTC), San Diego, California, 18-20 May 1992.

84. C. K. Campbell, J.D. van Wyk, M. F. K. Holm and J. J. Schoeman, "Aspects of modelling of high-voltage nonlinear ceramics capacitors," IEEE Trans. Components, Hybrids and Manufacturing Technology, vol. 15, pp. 245-251, April 1992.

83. P.M. Smith, P. J. Edmonson and C. K. Campbell, "Automatic gain controlled oscillating amplifier," Electronics Letters, vol. 27, pp. 1919-1920, 10 Oct. 1991.

82. C. K. Campbell, "Modelling the transverse-mode response of a two-port SAW resonator," IEEE Trans. Ultrasonics Ferroelectrics and Frequency Control, vol. 38, pp. 237-242,1991.

81. J.D. van Wyk, C. K. Campbell, M. F. K. Holm and J. J. Schoeman, "Studies of non-linear capacitors in snubber modules for power electronic switches," Proc. 6th conference on Power Electronics and Motion Control (PEMC '90), Budapest, Hungary, October 1990.

80. P. J. Edmonson, C. K. Campbell and C.B. Saw, "Cascaded SAW filters with single-phase unidirectional transducers," Canadian Conference on Electrical and Computer Engineering, Ottawa, 4-6 September 1990.

79. C.B. Saw and C. K. Campbell, "Sampling effect of distributed reflector arrays within a single-phase unidirectional SAW transducer," IEEE Trans. Ultrasonics, Ferroelectrics and Frequency Control, vol. 37, pp. 116-117, 1990.

78. C. G. Bailey and C. K. Campbell, "Design of phase-locked multimode SAW oscillator," IEEE Trans. Ultrasonics, Ferroelectrics, and Frequency Control, vol. 37. pp. 277-278, 1990.

77. C. K. Campbell, J. D. van Wyk, M. F. K. Holm and J. J. Schoeman, "High-field capacitance-temperature behaviour of BaTiO3 ceramic disc capacitors," IEEE Trans. Components, Hybrids and Manufacturing Technology, vol. 13, pp. 1124-1127, 1990.

76. C. Campbell, "Applications of surface acoustic and shallow bulk acoustic wave devices," Proceedings of IEEE, vol. 77, pp. 1453-1484, 1989. (Invited review paper with 322 references).

75. P.M. Smith and C. K. Campbell, "A theoretical and experimental study of low-loss SAW filters with interdigitated interdigital transducers," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 36, pp. 10-15, 1989.

74. C. K. Campbell and C.B. Saw, "Low-loss SAW filters with 70 dB sidelobes using cascaded and weighted single-phase unidirectional transducers," Electronics Letters, vol. 24, pp. 904-905, 1988.

73. P. J. Edmonson, C. K. Campbell and S.F. Yuen, "Study of SAW pulse compression using 5 x 5 Barker codes with quadraphase IDT geometries," 1988 IEEE Ultrasonics Symposium, Chicago, 2-5 Oct. 1988, vol. 1, pp. 219-222.

72. C.B. Saw, P.M. Smith, P. J. Edmonson and C. K. Campbell, "Mode selection in a multimode SAW oscillator using FM chirp mixing signal injection," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. 35, pp. 390-395, 1988.

71. C. K. Campbell, "Beat-frequency spectra in a driven unlocked multimode SAW oscillator," 1987 IEEE Ultrasonics Symposium, Denver, 14-16 Oct. 1987, vol. 1, pp. 69-71.

70. C.B. Saw and C. K. Campbell, "Improved design of single-phase unidirectional transducers for low-loss SAW filters," 1987 IEEE Ultrasonics Symposium, Denver, 14-16 Oct. 1987, vol. 1, pp. 169-172.

69. C. K. Campbell and C.B. Saw, "Analysis and design of low-loss SAW filters using single-phase unidirectional transducers," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. UFFC-34, pp. 357-367, 1987.

68. C.B. Saw, C. K. Campbell and P. J. Edmonson, "Multifrequency pulsed injection-locked oscillator using a novel low-loss SAW comb filter," 1986 IEEE Ultrasonics Symposium, Williamsburg, 17-19 Nov. 1986, vol. 1, pp. 273-276.

67. C. K. Campbell, P.M. Smith, C.B. Saw and P.M. Naraine, "Design of a harmonic-mode SAW delay line with split-electrode and stepped-finger geometry," 1986 IEEE Ultrasonics Symposium, Williamsburg, 17-19 Nov. 1986, vol. 1, pp. 43-46.

66. C. K. Campbell, J.D. van Wyk, J. Pieters and B. Lacquet, "A study of the fabrication and performance of a high-speed thin-film Schottky power diode," Thin Solid Films, vol. 144, pp. 193-200, 1986.

65. P.M. Smith and C. K. Campbell, "The design of linear phase SAW filters using the Remez exchange algorithm," IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, vol. UFFC-33, pp. 318-323, 1986.

64. P.M. Smith, C. K. Campbell and P. J. Edmonson, "Studies of the complex impulse response of a two-port SAW resonator," 1985 IEEE Ultrasonics Symposium, San Francisco, 16-18 Oct. 1985, vol. 1, pp. 262-265.

63. C. K. Campbell, P. J. Edmonson and P.M. Smith, The phase noise characteristics of a driven SAW oscillator in the threshold vicinity for injection locking," 1985 IEEE, Ultrasonics Symposium, San Francisco, 16-18 Oct. 1985, vol. 1, pp. 283-286.

62. R.I. Amorosi and C. K. Campbell, "Studies of a tunable SAW oscillator using a differential SAW delay line with MOSFET control," IEEE Transactions on Sonics and Ultrasonics, vol. SU-32, pp. 574-582, 1985.

61. C. K. Campbell, "Narrow-band filter design using a staggered multi-mode SAW resonator," IEEE Transactions on Sonics and Ultrasonics, vol. SU-32, pp. 65-70, 1985.

60. P. Naraine and C. K. Campbell, "Gigahertz SAW filter on yz-lithium niobate without the use of sub-micron lines," 1984 IEEE Ultrasonics Symposium, Dallas, 14-16 Nov., vol. 1, pp. 93-96.

59. P. J. Edmonson, C. K. Campbell and P.M. Smith, "Narrow-band SAW filters using stepped-resonators with tapered gratings," 1984 IEEE Ultrasonics Symposium, Dallas, 14-16 Nov. 1984, vol. 1, pp. 235-238.

58. C. K. Campbell, "Simplified computer-aided modelling of SAW transducer pattern masks," IEEE Transactions on Sonics and Ultrasonics, vol. SU-31, pp. 185-187, 1984.

57. N.J. Slater and C. K. Campbell, "Improved modelling of wide-band linear phase SAW filters using transducers with curved fingers," IEEE Transactions on Sonics and Ultrasonics, vol. SU-31, pp. 46-50, 1984.

56. C. K. Campbell, J. Sferrazza Papa and P. J. Edmonson, "Study of a UHF mobile radio receiver using a voltage-controlled SAW local oscillator," IEEE Transactions on Sonics and Ultrasonics, vol. SU-31, pp. 40-46, 1984.

55. J. Sferrazza Papa, C. K. Campbell and T. Chu, "Design of a UHF SAW resonator using harmonic mode excitation," 1983 IEEE Ultrasonics Symposium, Atlanta, 31 Oct. - 2 Nov. 1983, vol. 1, pp. 113-116.

54. P. Naraine and C. K. Campbell, "Wide band linear phase SAW filters using apodized slanted finger transducers," 1983 IEEE Ultrasonics Symposium, Atlanta, 31 Oct. - 2 Nov. 1983, vol. 1, pp. 113-116.

53. C. K. Campbell, P. J. Edmonson and J. Sferrazza Papa, "Multi-band SAW filter design using the Remez exchange algorithm," 1983 IEEE Ultrasonics Symposium, Atlanta, 31 Oct. - 2 Nov., 1983, vol. 1, pp. 1-4.

52. C. K. Campbell, "A layman's guide to surface acoustic wave devices," Proceedings of Academy of Science of Royal Society of Canada, Series IV, vol. XXI, pp. 117-123, 1983. (Invited paper as winner of Thomas W. Eadie Medal of The Royal Society of Canada, for major contributions to Engineering/Applied Science in Canada).

51. C. K. Campbell, "Z-transform analysis of a SAW delay line oscillator," IEEE Transactions on Sonics and Ultrasonics, vol. SU-30, pp. 313-317, 1983.

50. C. K. Campbell, "Observations on the spectral response of a driven unlocked SAW delay line oscillator," IEEE Transactions on Sonics and Ultrasonics, vol. SU-30, pp. 137-139, 1983.

49. C. K. Campbell, "FM demodulation at UHF frequencies using an injection-locked SAW oscillator," IEEE Transactions on Sonics and Ultrasonics, vol. SU-29, pp. 310-316, 1982.

48. C. K. Campbell, "Application of inverse discrete Fourier transform to the design of SAW filters with nonlinear phase response," 1982 IEEE Ultrasonics Symposium, San Diego, 27-29 Oct. 1982, pp. 46-49.

47. C. K. Campbell, Y. Ye and J. Sferrazza Papa, "Wideband linear phase SAW filter design using slanted transducer fingers," IEEE Transactions on Sonics and Ultrasonics, vol. SU-29, pp. 224-228, 1982.

46. P.L. Swart and C. K. Campbell, "Gate-voltage limitations for thin channel MIS and Schottky buried-channel charge-coupled devices," Microelectronics Journal, vol. 12, pp. 5-10, 1981.

45. P. Naraine, C. K. Campbell and Y. Ye, "A SAW step-type delay line for efficient high-order harmonic mode excitation, 1980 IEEE Ultrasonics Symposium, Boston, 5-7 Nov. 1980, vol. 1, pp. 322-325.

44. S. Nanayakkara and C. K. Campbell, "A surface acoustic wave application for a PAM-FM communication modem," 1980 IEEE Ultrasonics Symposium, Boston, 5-7 Nov. 1980, vol. 1, pp. 22-24.

43. C. K. Campbell, "Observations on the short-term stability of a SAW delay line oscillator," 1980 IEEE Ultrasonics Symposium, Boston, 5-7 Nov. 1980, vol. 1, pp. 260-263.

42. M.S. Suthers, C. K. Campbell and J.P. Reilly, "SAW bandpass filter design using Hermitian function techniques," IEEE Transactions on Sonics and Ultrasonics, vol. SU-27, pp. 90-93, 1980.

41. S. Nanayakkara and C. K. Campbell, "Evaluation of signal and noise performance of a sampling wideband SAW FM discriminator," 1979 IEEE Ultrasonics Symposium, New Orleans, 26-28 Sept. 1979 pp. 738-742.

40. M. Suthers and C. K. Campbell, "Use of a charge distribution model in SAW bandpass filter design," 1979 IEEE Ultrasonics Symposium, New Orleans, 26-28 Sept. 1979, pp. 565-569.

39. S. Nanayakkara and C. K. Campbell, "A method for converting frequency to voltage using a surface acoustic wave device," IEEE Transactions on Sonics and Ultrasonics, vol. SU-26, pp. 419-422, 1979.

38. D. G. Seiler and C. K. Campbell, "A pattern generator for E-beam lithography using a scanning electron microscope," IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. IECI-26, pp. 205-210, 1979.

37. D. G. Seiler and C. K. Campbell, "Fabrication of thin film interdigital transducers for surface acoustic wave devices operating at gigahertz frequencies," Thin Solid Films, vol. 62, pp. 109-114, 1979.

36. C. K. Campbell, "Free-space permittivity measurements on dielectric materials at millimeter wavelengths," IEEE Transactions on Instrumentation and Measurement, vol. IM-27, pp. 54-58, 1978.

35. P.L. Swart and C. K. Campbell, "The measurement of mobilities and doping concentrations in field-effect-controlled thin semiconductor films," Thin Solid Films, vol. 44, pp. 93-102, 1977.

34. S. Nanayakkara and C. K. Campbell, "A technique for modifying the aperture of an interdigital transducer finger pattern for a surface acoustic wave device," Thin Solid Films, vol. 6, pp. 75-80, 1977.

33. C. K. Campbell, I. Traboulay, M.S. Suthers and H. Kneve, "Design of a stripline log-periodic dipole antenna," IEEE Transactions on Antennas and Propagation, vol. AP-25, pp. 718-721, 1977.

32. J.P. Reilly, C. K. Campbell and M.S. Suthers, "The design of SAW bandpass filters exhibiting arbitrary phase and amplitude characteristics," IEEE Transactions on Sonics and Ultrasonics, vol. SU-24, pp. 301-305, 1977.

31. D. G . Seiler, C. K. Campbell and M.S. Suthers, "A technique for measuring and matching the input impedance of a narrow-band surface acoustic wave filter," IEEE Transactions on Instrumentation and Measurement, vol. IM-26, pp. 188-189, 1977.

30. M. H. El-Diwany and C. K. Campbell, "Modification of optimum impulse response techniques for application to SAW filter design," IEEE Transactions on Sonics and Ultrasonics, vol. SU-24, pp. 277-279, 1977.

29. C. K. Campbell and S.K. Sarna, "Minicomputer interfacing for electrical engineering undergraduates," IEEE Transactions on Education, vol. E-20, pp.; 13-17, 1977.

28. D. G. Seiler, C. K. Campbell and M.S. Suthers, "A low cost controller for an electron lithography system using a scanning electron microscope," IEEE Transactions on Industrial Electronics and Control Instrumentation, vol. ECI-23, pp. 325-328, 1976.

27. C. K. Campbell, "Rapid measurement of dielectric substrate permittivity at X-band," IEEE Transactions on Instrumentation and Measurement, vol. IM-24, pp. 82-83, 1975.

26. C. K. Campbell and C. H. Morgan, "Some studies of thin film diodes utilizing cadmium sulphide and sulphur," Thin Solid Films, vol. 26, pp. 213-220, 1976.

25. P.L. Swart and C. K. Campbell, "Effects of losses and parasitics on a voltage-controlled tunable distributed RC notch filter," IEEE Journal of Solid State Circuits, vol. SC-9, pp. 35-36, 1974.

24. K.O. Hill and C. K. Campbell, "A circular plane-mirror laser -interferometer containing an angular-limiting device," Canadian Journal of Physics, vol. 51, pp. 2114-2117, 1973.

23. C. K. Campbell, "The microwave permeability of a ferrite- filled parallel-plate transmission structure," Canadian Journal of Physics, vol. 51, pp. 2495-2497, 1973.

22. P. Dupuis and C. K. Campbell, "Characteristic impedance of surface strip coplanar waveguide," Electronics Letters, vol. 9, pp. 354-355, 1973.

21. C. K. Campbell, "The frequency response of a superconducting transmission line," Proceedings of the IEEE, vol. 61, pp. 799-800, 1973.

20. K.O. Hill and C. K. Campbell, "Lowest-order mode selection in a laser interferometer," Canadian Journal of Physics, vol. 51, pp. 624-628, 1973.

19. K.O. Hill and C. K. Campbell, "Studies of a porro-prism Q- switched giant pulse laser oscillator," Canadian Journal of Physics, vol. 51, pp. 2-24, 1973.

18. C. K. Campbell, "The use of magnetic fields in the electron beam evaporation of low-loss dielectric films," Thin Solid Films, vol. 12, pp. 519-520, 1972.

17. P.L. Swart and C. K. Campbell, "A voltage-controlled tunable distributed RC filter," IEEE Journal of Solid State Circuits, vol. SC-7, pp. 306-308, 1972.

16. C. K. Campbell and M. Thewalt, "Radio frequency dielectric dissipation measurements on yttrium oxide thin films," Thin Solid Films, pp. 195-198, 1972.

15. P.L. Swart and C. K. Campbell, "Effects of inductance on characteristics of a distributed RC notch filter," Proceedings of the IEEE, vol. 59, pp. 1371-1373.

14. C. K. Campbell, "Transmission line graphical analysis of a distributed RC notch filter," Proceedings of the IEEE, vol. 59, pp. 1362-1363, 1971.

13. J.A. Carson, C. K. Campbell, P.L. Swart and F. J. Vallo, "Effects of dielectric losses on the performance of evaporated thin-film distributed RC notch filters," IEEE Journal of Solid State Circuits, vol. SC-6, pp. 120-124,1971.

12. H. S. Douglass and C. K. Campbell, "Gain characteristics of an Nd3+-glass pulsed solid-state laser amplifier," Canadian Journal of Physics, vol. 48, pp. 2714-2719, 1970.

11. C. K. Campbell, "Some dielectric properties of electron-beam evaporated yttrium oxide thin films," Thin Solid Films, vol. 6, pp. 197-202, 1970.

10. R.C. Dynes, J.P. Carbotte, D. W. Taylor and C. K. Campbell, Tunneling study of superconductivity in Ti-Pb-Bi alloys," The Physical Review, vol. 178, pp. 713-724, 1969.

9. D, G. Walmsley, C. K. Campbell and R.C. Dynes, "Superconductivity of very thin aluminium films," Canadian Journal of Physics, vol. 46, pp. 1129-1132, 1968.

8. D. G. Walmsley and C. K. Campbell, "Tunneling measurements on superconductors with isotropic energy gaps," Canadian Journal of Physics, vol. 45, pp. 1541-1548, 1967.

7. C. K. Campbell and R. H. Hum, "Observations on paramagnetic cooling with synthetic ruby," Canadian Journal of Physics, vol. 45, pp. 1413-1415, 1967.

6. C. K. Campbell and D. G. Walmsley, "Tunneling investigations of energy-gap anisotropy in superconductors," Canadian Journal of Physics, vol. 45, pp. 159-177, 1967.

5. C. K. Campbell, R.C. Dynes and D. G. Walmsley, "Anisotropy of the energy gap in superconducting lead-bismuth alloys," Canadian Journal of Physics, vol. 44, pp. 2601-2604, 1966.

4. C. K., Campbell and J.P. van Nest, "The effects of scatter and diffraction on the spiking period of a ruby laser," Proc. IEEE, vol. 52, p. 210, 1964

3. C. K. Campbell and D. G. Walmsley, "Joule heat effects in superconducting electromagnets," Canadian Journal of Physics, vol. 41, pp. 416-419, 1963.

2. D. Bijl and C. K. Campbell, "Experiments with a two-level maser," Problems of Low Temperature Physics and Thermodynamics II, Pergammon Press, pp. 201-202, 1962.

1. C. K. Campbell," Magnetization nutations in maser oscillation pulses," Canadian Journal of Physics, vol. 39, pp. 1514- 1515, 1961

THESES BY COLIN CAMPBELL.

C. K. Campbell, "Investigation of a 0.5 Kilowatt Magnetic Amplifier With Short Response Time," S. M. Thesis in Electrical Engineering, Massachusetts Institute of Technology, 1953.

C. K. Campbell, "Design of a Two-Level Solid-State Maser," Ph.D. in Low-Temperature Physics, University of St. Andrews, Scotland, 1960.

C. K. Campbell, "Studies of Thin-Film and Solid-State Materials and Devices," D.Sc. in Engineering and Applied Science, University of Dundee, Scotland, 1984.

END