This paper provides a review of various methods of optical control of microwave circuits by using p-i-n photodiodes. Theoretical and experimental studies have been carried out to investigate the effect of optical radiation on the capacitance and resistance of a p-i-n photodiode at low and high frequencies. Methods are discussed to increase the capacitance ratio and quality factor of a p-i-n photodiode operating as a varactor to implement optical control of microwave circuit.
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