X-BAND SEMICONDUCTOR SWITCHING AND LIMITING USING WAVEGUIDE SERIES TEES
ARMY ELECTRONICS LABS FORT MONMOUTH NJ
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A new microwave semiconductor switching technique X-band is described. This technique uses various types of varactor diodes operating in a series mode. Series mode switching is obtained by cascading several E-plane tee junctions. Each tee is terminated in a fixed tuned crystal mount. A diode when inserted in its holder is spaced in an integral half guide wavelength from the junction of the series arm and the main waveguide, and each series arm is separated by odd integers of quarter wavelengths. Isolations of 30 to 48 db and insertion losses of 0.3 to 0.8 db were obtained at a frequency of 9375 mcs. Details of a semiconductor X-band power limiter are given. The limiter consists of the same configuration as the switch except that it is not externally biased. Isolations of 20 to 30 db over a bandwidth of 180 to 250 mcs and insertion loss of 1.2 db and less over a 500 mcs bandwidth were noted.
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