Title :
Radial cavity-fed spatial power combiner with retrodirective array behavior
Author :
Subbarao, Bandaru ; Fusco, Vincent F.
Author_Institution :
Sch. of Electr. & Electron. Eng., Queens Univ. of Belfast, UK
fDate :
5/1/2004 12:00:00 AM
Abstract :
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.
Keywords :
III-V semiconductors; active antenna arrays; antenna feeds; antenna radiation patterns; directive antennas; gallium arsenide; microstrip antenna arrays; microwave mixers; power combiners; rectangular waveguides; slot antenna arrays; 10.38 GHz; 20.76 GHz; EIRP; GaAs MESFET rectangular microstrip patch antennas; active antenna radiating elements; microwave antenna; quasioptical power combining; radial cavity waveguide; radio frequency conversion efficiency; retrodirective array; self-oscillating mixers; slot coupled active antenna; spatial power combiner; Couplings; FETs; Gallium arsenide; MESFETs; Microstrip antenna arrays; Microstrip antennas; Patch antennas; Power combiners; Radio frequency; Slot antennas; Active antenna; retrodirective array; spatial power combining;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2004.827492
