This paper presents an optically controlled broadband phase‐shifter using a parallel‐line coupler, that takes advantage of high‐resistivity silicon photo‐absorption at 840 nm. A continuously variable phase‐shifting of 120° is achieved at 11 GHz with Δ|S21| < 5 dB and with |S11| < −15 dB in a large frequency band (6–15 GHz).
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Khaldi et al. (2005) studied this question.
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