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Research Focus
| Our work is aimed at developing high-power, broadband
solid-state microwave and millimeter-wave amplifiers for communications
and radar transmitters, as an alternative to vacuum-electronic (tune)
systems. Our approach is to develop novel circuits or combiner
structures that integrate a large number of semiconductor devices,
addressing fundamental limitations in
device output power at high frequencies (the classic Pf 2=constant
limitation). Our most successful efforts have centered on the use
of broadband antenna arrays for power distribution and collection, a
so-called "spatial" combining technique. We have
demonstrated GaAs-based combiners with up to 150Watts
output power at X-band (8-11GHz) using this technique,
integrating 32 commercial MMICs. Currently we
are exploring new architectures for improved bandwidth, increased power
capacity, and high efficiency, and are adapting these technologies to
wide-bandgap (Sic and GaN) devices for ultra high power systems. |
Project Descriptions
References
 | J. Harvey, E.R. Brown, D.B. Rutledge and R.A. York, "Spatial
Power Combining for High-Power Microwave and Millimeter-Wave Transmitters",
to appear in IEEE Microwave Magazine. |
| R.A. York, "Some
Considerations for Optimal Efficiency and Low Noise in Large Power Combiners",
to appear in IEEE Trans. Microwave Theory Tech. |
| P. Jia, L.-Y. Chen, N.-S. Cheng and R.A. York, "Design
of waveguide finline arrays for spatial power combining", to appear
in IEEE Transactions on Microwave Theory and Techniques. |
| N.-S. Cheng, T.-P. Dao, M.G. Case, D.B. Rensch and R.A.
York, "A 120-Watt X-Band
Spatially Combined Solid State Amplifier", IEEE Trans. Microwave
Theory Tech, vol. MTT-47, pp. 2557-2561, December, 1999. |
| D.B. Rutledge, N.-S. Cheng, R.A. York, R. M. Weikle II,
M.P.DeLisio, "Failures
in power-combining arrays", IEEE Trans. Microwave Theory Tech. ,
vol. MTT-47, pp. 1077-1082, July 1999. |
| N.-S. Cheng, A. Alexanian, M.G. Case, D.Rensch, and R.A.
York, "40 watt CW broadband
spatial power combiner using dense finline arrays", IEEE Trans.
Microwave Theory Tech. , vol. MTT-47, pp. 1070-1076, July 1999. |
| E.S. Shapiro, J. Xu, A.S. Nagra, F. Williams Jr., U.K.
Mishra, and R.A. York, "A
high-efficiency traveling wave power amplifier topology using improved power
combining techniques", IEEE Microwave Guided Wave Lett. , vol. 8,
pp. 133-135, March 1998. |
| A. Alexanian and R.A. York, "Broadband
spatially combined amplifier array using tapered slot transitions in
waveguide", IEEE Microwave Guided Wave Lett. , vol. 7, no. 2, pp.
42-44, Feb 1997. |
Related Work
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