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Impedance tuning with photoconductors to 40 GHz



Jasper A. Drisko, Ari D. Feldman, Franklyn J. Quinlan, James C. Booth, Nathan D. Orloff, Christian J. Long


Light has been widely used to control a variety of microwave devices, including switches, antennas, and detectors. Here, we present a photoconductive device integrated into a coplanar waveguide to tune complex impedances at microwave frequencies with applied light. We measured the direct-current current-voltage characteristics of the device as a function of the applied light intensity and fit the behavior to a known model. We also measured the frequency dependent scattering parameters and extracted the device impedances in a Pi-network model. We show wide impedance tunability over the entire frequency range investigated and develop a circuit model to fit the frequency-dependent impedances. This simple device has applications in microwave electronics, microwave metrology, and multi-state calibrations.
IEEE Microwave and Wireless Components Letters


microwave switches, antennas, waveform generation, detectors, mixers


Drisko, J. , Feldman, A. , Quinlan, F. , Booth, J. , Orloff, N. and Long, C. (2019), Impedance tuning with photoconductors to 40 GHz, IEEE Microwave and Wireless Components Letters, [online], (Accessed April 17, 2024)
Created January 22, 2019, Updated January 27, 2020