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.
, Feldman, A.
, Quinlan, F.
, Booth, J.
, Orloff, N.
and Long, C.
Impedance tuning with photoconductors to 40 GHz, IEEE Microwave and Wireless Components Letters, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925456
(Accessed April 22, 2021)