CST – Computer Simulation Technology

Optically controlled phase-shifter for antenna beam-forming
Mohamed El Khaldi, Florence Podevin, Anne Vilcot
SPIE Digital Library; Proc. SPIE 5971
Volume 5971, September 28, 2005
Phased array antenna, optical control, coupler, phase-shifter, photoconductivity
We propose here to apply the technique of the optical control of microwave devices to perform phase-shifting for microstrip phased arrays. The physical principle used is the photoconductive effect which enables the creation of a variable microwave load, when a gap in a line is illuminated with an optical signal of adequate wavelength. This principle is applied on a hybrid microwave ring. We have designed a phase-shifter with continuously varying phase and quasi-constant |S21|, with few return losses. The measurements have given interesting results. A low cost and small size microstrip phased array antenna has been designed. By illuminating the phase-shifter under different optical powers, the main beam can be scanned in the H-plane continuously from -25° to 25°.

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