The authors report a new optoelectronic technique for tuneable microwave matching. It is based on the illumination of a DC biased microstrip resonator on a silicon substrate. The matched frequency is tuned e.g. between 5 and 7 GHz, with a return loss over 45 dB, by varying the optical power and the DC bias.
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http://iet.metastore.ingenta.com/content/journals/10.1049/el_19960182
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