Joseph R. Flemish

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A silicon-based photoconductive switch and attenuator for microwave signals has been demonstrated and optimized for low insertion loss and high attenuation response upon illumination from a standard infrared LED. This device is fabricated within a coplanar waveguide for easy integration into a planar antenna for photonic control of an array. A general(More)
Several plasma and wet-chemical surface treatments have been tested to determine their effectiveness in improving SiN passivation of the AlGaN surface in HEMT devices. Mitigation of RF dispersion was evidenced by dramatic improvements in pulsed IV data after various plasma surface treatments and SiN passivation were applied to gate-level processed HEMTs. To(More)
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