Title :
A planar circular phase conjugated array with full scanning range
Author :
Chiu, Leung ; Xue, Quan ; Chan, Chi Hou
Author_Institution :
Department of Electronic Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, China
Abstract :
A 12-element circular retrodirective array is proposed for a full 360deg scanning range. Each radiating element is a modified end-fire quasi-Yagi antenna with a low profile, 21% impedance bandwidth and 4.5 dBi peak gain at a center frequency of 5.8 GHz. Resistive field effect transistor (FET) mixers are employed to provide the required phase conjugation. The mixers offer a low 4.8 dB conversion loss at 3.5 dBm LO power via the use of a non-linear optimization technique of multi-harmonic loads. The whole retrodirective array was implemented on a single circular printed circuit board with a central LO feed, providing a low-cost solution. The full-range coverage was experimentally confirmed by measuring both the bi- and mono-static radiation patterns.
Keywords :
Yagi antenna arrays; microwave field effect transistors; microwave mixers; bistatic radiation patterns; circular phase conjugated array; circular retrodirective array; end-fire quasiYagi antenna; frequency 5.8 GHz; loss 4.8 dB; monostatic radiation patterns; multiharmonic loads; nonlinear optimization; phase conjugation; planar phase conjugated array; printed circuit board; resistive field effect transistor mixers; retrodirective array; Antenna arrays; Dipole antennas; FETs; Feeds; Frequency; Impedance; Microstrip antennas; Mixers; Phased arrays; Receiving antennas; Circular Antenna Array; Resistive FET Mixer; Retrodirective Phase Conjugated Array;
Conference_Titel :
Microwave Symposium Digest, 2008 IEEE MTT-S International
Conference_Location :
Atlanta, GA
Print_ISBN :
978-1-4244-1780-3
Electronic_ISBN :
0149-645X
DOI :
10.1109/MWSYM.2008.4632953
