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Indirect optical control of microwave circuits using monolithic optically variable capacitors

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5 Author(s)
Nafra, A.S. ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; Jerphagnon, O. ; Chavarkar, P. ; VanBlaricum, M.
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In this paper, we present an integrated circuit technology suitable for low-power bias-free optical control of microwave circuits and antennas. We have integrated miniature photovoltaic arrays with varactor diodes and thin-film resistors to form monolithic optically variable capacitors (OVCs). For the monolithic OVC described here, only 1.5 mW of optical power was required for more than 2:1 change in capacitance (0.9-0.4 pF). Optically controlled microwave circuits such as X-band analog phase shifters and tunable notch filters, which incorporated the monolithic OVC as the control element, were fabricated to demonstrate the potential of this technology

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:47 ,  Issue: 7 )