Dr. Richard V. Snyder
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Dr. Richard V. Snyder is the President and founder of RS Microwave Company Inc., an internationally respected 30 year old manufacturer of RF and Microwave filters. He is the author of 115 papers, three book chapters and holds 21 patents, with other applications on file. His interests include E-M simulation, network synthesis, dielectric and suspended resonators, high power notch and bandpass filters and active filters. He received his BS, MS and PhD degrees from Loyola-Marymount, USC and Polytechnic Institute of New York University, respectively. His current research areas include electromagnetic simulation as applied to filters and networks, dielectric resonators, suspended resonators and active filter networks. Dr. Snyder’s contributions have led to improved performance and decreased size for communication and electronic countermeasure systems. In the area of bandpass filters, he has been instrumental in the development of evanescent mode designs with ratios of stopband width to passband center frequency of up to 40:1. A classical comb-line design displayed ratios of only 8:1. He has developed dielectric resonator bandpass filters with very wide stopbands by combining evanescent mode filters with dielectric resonators, imbedding one into the other. His high-power bandstop filters have helped to make the Link-16 military communication system a production success. With his current successful efforts in miniaturization, they are leading to a new generation of airborne, miniaturized Link-16 related systems.
Dr. Snyder served the North Jersey Section as Chairman and 14 year Chair of the MTT-AP chapter, as well as chair of the North Jersey EDS and CAS chapters. He twice received the Region 1 award. In January 1997 he was named a Fellow of the IEEE "For contributions to the development of high power miniature stopband filters and extremely wideband bandpass filters for microwave applications." He is now a LIFE Fellow. In January 2000, he received the IEEE Millennium Medal for outstanding contributions in his field. Dick served as General Chairman for the very successful IMS2003 and is Emeritus Chair for IMS2018 also in Philadelphia. He was elected to ADCOM in 2004. Within the ADCOM, he served as Chair of the TCC and Liaison to the EuMA.
Dr. Snyder served as an MTT-S Distinguished Lecturer, from 2007-2010, as well as continuing as a member of the Speakers Bureau. Dr. Snyder was recipient of the best paper presentation notice at the 1991 MTT-S Symposium. He was an Associate Editor for the IEEE Transactions on Microwave Theory and Techniques, responsible for most of the filter papers submitted. He is a member of the American Physical Society, the AAAS and the New York Academy of Science. He was the MTT-S President for 2011.
Also a reviewer for IEEE-MTT and EMC publications, Dr. Snyder teaches and advises at the New Jersey Institute of Technology (NJIT). He is also a Visiting Professor at the University of Leeds, in the U.K. He served as Standards Chairman for the MTT ADCOM. He served 7 years as Chair of MTT-8 and continues in MTT-8/TPC work. He is the organizer of the annual IWS conference in China.
Previous positions held included Research Engineer at ITT-Gilfillan, Chief Engineer for Merrimac Industries, Vice-President of FEL where he ran the Microwave Division, and Chief Engineer for Premier Microwave.
Main Technical Work
September 2010: Wide Passband, Wide Stopband, High Power, Reduced Size Bandpass Filters
(in ascending date order through 2005)
1. First use of embedding transistor parameters into matching networks and filters. This 1965 work enabled the design of broad band amplifiers with flat gain over octave and greater bandwidths.
Relevant publication: “Broadband impedance-matching techniques applied to design of UHF transistor amplifers”, Proc. IEEE, Jan, 1967
2. First work determining simultaneous realizability conditions for stability and conjugate (maximum power transfer) match in amplifiers driven by networks of various bandwidths. This work enabled further improvements in achievement of gain- bandwidth product in wide-band amplifier circuits.
Relevant publication: “Simultaneous stability and conjugate match”, Electronic Communicator, Dec., 1967.
3. Development of tangent-sensitive phase-lock detector, leading to wide-slew compatible phase lock loops for use in receivers. This led to a U.S. patent called “Tanlock-a new phase detector”, in 1962 (with Mike Balodis).
4. Extension of alternating low- and high-impedance line cascade design to low pass filters up to 26 GHz cut-off using an inverted structure. This work allowed the application of known low-pass synthesis methods to very high frequency cut-off low pass filters without the problems of other designs using extremely small parts. An entire line of lowpass and bandpass filters was developed that is still in use extensively. These are the so-called “tubular filters”.
Relevant publication: “A new Microwave low-pass structure”, IEEE MTT-S Transactions, April, 1968.
Relevant publication: “ Apractical tubular bandpass at 18 GHz”, Electronic Communicator, Jan. 1969.
5. Application of lumped element filter design techniques to active filters in the VHF-UHF range. This seminal work made practical the achievement of stable bipolar active filters using conventional y-parameters. This work is still one of the most highly referenced works in bibliographies of new active filter papers. The continuation of this work will still be a major portion of Snyder’s new research, as extension to FET-based MMIC’s has the potential to revolutionize receiver design in both military and wireless commercial applications.
Relevant publication: “Analysis and Design of a Microwave Transistor Active Filter”, IEEE MTT-S Transactions, Jan. 1970.
6. Derivation of conditions for one-to-one mapping of phase information from an RF to an IF domain. This work proved the accuracy of phase measurement test sets using a heterodyne conversion process and allowed for the design of such test sets from almost DC to an arbitrarily high RF input frequency. The result was production of an line of such test sets.
Relevant publication: “One-to-one Mapping of Phase information, R.F. to I.F. Frequency Transformation”, as an Appendix in the BSTJ, 1966, to an article by H. Seidel.
7. Development of odd-number isolated power division in stripline power dividers. This applied to the design of feed structures for electronically scanned arrays. The structures were used in the SPS-48, TPS-32, and other radar systems requiring isolated feeds.
Relevant publication: “Odd-number Power Division in a Stripline Configuration”, ITT Technical Publication, Jan. 1967.
8. Development of non-N P/2 phase related hybrids, such as a 3-way, 1200 relative-phased output hybrid based on a Snyder- Scott Tee. This has led to hybrid-coupled amplifier chains using three way isolated splitters with low input VSWR.
Relevant publication: “A new Broad-Band Multiport Differential Phase Shift Network...” Proc. IEEE, Aug. 1971 Relevant US Patent: “ Wide Band Phase Splitting Network”.....” US Patent 3,622,920
9. Development of feed-forward cancellation circuitry for antenna feed harmonic and intermodulation distortion cancellation, as well as improving equivalent isolation for orthomode transducers used in such feeds. This has led to adaptive cancellation schemes in antenna feeds used for satellite communication today.
Relevant US patent: “Feed Forward Passive Coupling System and Method”, US Patent 4,072,913.
10. Development of sidewall-coupled dual mode bandpass filters used in tunable and fixed application. These filters are part of most of today’s military digital radio and troposcatter radio systems.
Relevant publication: “The Dual Mode Filter-A Realization”, Microwave Journal, Dec., 1974.
Relevant US Patent: “ Multicavity Dual Mode Filter”, US Patent 3,936,775
11. Development of dual-mode band rejection filters. These filters are used in today’s compact radar and communication receivers.
Relevant publication: “Realization of Dual Mode Band Rejection Filter”, Proc. of 1979 MTT-S International Symposium, Orlando, Fl.
Relevant US Patent: “Dual-Mode Band Rejection Filter”, US Patent 4,218,666.
12. Development of a new low-pass absorbing filter for very high power application in radar systems. This new approach reduced size and cost for megawatt-level absorbers used with most high power ASR and ARSR radars.
Relevant publication: “An Improved Low-Pass Harmonic Absorber”, Proc. of 1976 MTT-S International Symposium, Cherry Hill, NJ.
Relevant US Patent: “Low-Pass Harmonic Absorber”, US Patent 4,096,457.
13. Development of evanescent-mode bandpass filters. These are used in ECM receivers and systems, as they are the smallest, most efficient filters developed for braodband applications.
Relevant publications: “New Application of Evanescent Mode Waveguide to Filter Design”, Proc. of 1977 MTT-S Int. Symposium and in December 1977 Transactions, MTT-S;
“Broadband Waveguide filters with Wide Stopband using a Stepped-Wall Evanescent mode approach”, Proc. 1983 Int. MTT-S Symposium.
Also similar on evanescent mode filters in Microwave Journal, Dec. 1983, ESA-ESTEC Conference (Noordvjik, Holland), Nov. 1995., and a new symmetrical response configuration in the Proc. Int. MTT-S Symposium, June 1996.
14. Development of very narrowband dielectric resonator filters with wide stopbands.
Relevant Publication: “NB D.R. filters with wide...”, Transactions. MTT-S, Nov. 1992, and Proc. of M-94 Conference, Wembley, U.K.
Relevant US Patent: US Patent 5,220,300.
15. Very compact, high power notch filters for JTIDS applications. This has reduced the size of the band reject filters needed for high power airborne spread-spectrum systems, to previously unachievable levels.
Relevant Publication: Transactions. MTT-S, July, 1994.
16. Flat-response octave-bandwidth quadrature hybrid (“the Equad”).
Relevant Publication: “The Equad...”, Proc. Int. MTT-S Symp., 1982.
Relevant US Patent: US Patent Applied for.
17. Lossy, hybrid coupled amplitude equalizers.
Relevant publication: “Lossy, hybrid coupled....”, Proc. Int. MTT-S Symp., 1984.
Relevant US Patent: US Patent Applied for.
18. Development of planar, coplanar stripline mixer.
Relevant US Patent: US Patent 4,430,758.
19. Tunable Filter Workshop
Relevant Publication: “Mechanically Tunable Filters”, 1992 Intl. Symp. MTT-S.
20. Workshop on Filter and Passive Component Modeling
Relevant Publication: “Modeling of Microwave Filters and Passive Components”, Int. Symp. MTT-S, 1995.
1996 - Present
(not including Workshop papers, Speaker’s Bureau papers or other presentations)
R.V. Snyder, "Inverted Resonator Evanescent Bandpass filters", Proc. IEEE MTT-S Symposium, San Francisco, June, 1996.
R.V. Snyder, "Cross Coupled Evanescent Bandpass filters", Proc. IEEE MTT-S Symposium, Denver, June 1997.
R.V. Snyder, "Filters using both Active and Passive Resonators", IEEE - ICECS Conference, Cairo, Egypt, December 1997.
R.V. Snyder, "Filter Design Using Miultimode Lumped Equivalents Extracted from E-M Simulations", MTT-ED Workshop on Global Simulators, La Rochelle, France, April 1998.
R.V. Snyder, "Recent Advances in the Implementation of Quasi-Optimum Filters", European Microwave Conference, Amsterdam, Netherlands, October 1998.
"Generalized Cross-Coupled Filters Using Evanescent Mode Coupling Elements"
RV Snyder - Proc. 1996 IMS MTT-S, Denver, June 1997
"Quasi-elliptic compact high-power notch filters using a mixed lumped and distributed circuit"
RV Snyder, RS Microwave, NJ Butler - Microwave Theory and Techniques, IEEE Transactions, 1999
"Filters using a new type resonator: the partially-metallized dielectric slug"
RV Snyder, C Alvarez - IEEE MTT-S International Microwave Symposium Digest, 1999
"A wide-band tunable filter technique based on double-diplexing and low-Q tuning elements"
RV Snyder, RSMC Inc, NJ Butler - Microwave Symposium Digest, 2000 IEEE MTT-S International, 2000
"Filters with an almost constant stopband"
RV Snyder, RSMC Inc, NJ Butler - IEEE MTT-S International Microwave Symposium Digest, 2000
"360-degree linear analog phase shifter design using tunable short-circuit terminated combline"
S. Shin, RV Snyder, E Niver - Microwave Symposium Digest, 2001 IEEE MTT-S International, 2001
"Design Of Microwave Filters"
R Levy, RV Snyder, G Matthaei - IEEE Transactions on Microwave Theory and Techniques, 2002
"Suspended resonators for filters-reduced ? g excitation of evanescent cavities using high dielectric constant feedlines"
RV Snyder, E Niver, K Um, S Shin, RS Microwave, NJ … - Microwave Symposium Digest, 2002 IEEE MTT-S International, 2002
"Bandstop filter design using evanescent mode resonators"
RV Snyder, S Shin, K Keck - Microwave Symposium Digest, 2003 IEEE MTT-S International, 2003
"At least N+ 1 finite transmission zeros using frequency-variant negative source-load coupling"
S Shin, RV Snyder - Microwave and Wireless Components Letters, IEEE 2003
"Bandstop Filters Using Dielectric Loaded Evanescent Mode Resonators"
RV Snyder, S Shin, RSM Inc - Microwave Symposium Digest, 2004 IEEE MTT-S International, 2004
"Parallel Coupled Line Notch Filter with Wide Spurious-Free Passbands"
RV Snyder, S Shin,Microwave Symposium Digest, 2005 IEEE MTT-S International, 2005
- IEEE MTT-S 2011 President
- IEEE North Jersey Section (past Chairman)
- MTT & AP Societies (past Chairman- 14 yrs)
- METSAC (Chairman 95-96)
- Co-Chairman MTT-8 (Theory & Techniques Technical Committee)
- Co-Chair MTT-AP 2003 Symposium
- MTT ADCOM TCC Chair
- MTT ADCOM Standards Chairman
- IEEE Associate Editor and Reviewer for Transactions & Microwave and Guided Wave Letters
- Adjunct Professor New Jersey Institute of Technology
- Visiting Professor at the University of Leeds (U.K.)
- Honors: IEEE Life Fellow; MTT-S Symposium Best Paper 1991