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Radial cavity-fed spatial power combiner with retrodirective array behavior

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2 Author(s)
Subbarao, B. ; Sch. of Electr. & Electron. Eng., Queens Univ. of Belfast, UK ; Fusco, V.F.

This paper discusses the design and operational properties of a circular array of slot coupled active GaAs metal-semiconductor field-effect transistor (MESFET) rectangular microstrip patch antennas arranged for quasioptical power combining at X band. The active antenna radiating elements are injection locked by slot coupling to a radial cavity waveguide. Spatial power combining efficiency of 75% and dc to radio frequency (RF) conversion efficiency of 10% at 28 dBm EIRP was achieved at 10.38 GHz. Retrodirective action was also demonstrated by using the active elements as self-oscillating mixers pumped at 20.76 GHz.

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Antennas and Propagation, IEEE Transactions on  (Volume:52 ,  Issue: 5 )