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Cryogenic Ka-Band 180 ^{\circ} Phase Switch Based on Schottky Diodes

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5 Author(s)
Villa, E. ; Dept. of Commun. Eng., Univ. of Cantabria, Santander, Spain ; Aja, B. ; Cano, J.L. ; de la Fuente, L.
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A Ka-band hybrid 0/180° phase switch working at cryogenic temperature is presented. The circuit is designed on an alumina substrate using uniplanar hybrid technology, combining air-bridged coplanar waveguides and slotlines. Schottky diodes are used as switching elements, taking advantage of their cryogenic behavior, with low equivalent series resistance and low capacitance. Cryogenic performance at 15 K shows a phase difference response of 177 ±2°, average insertion losses of 1 dB and amplitude imbalance of less than 0.2 dB between states in the frequency range from 24 to 37 GHz (40% relative bandwidth) with a low-power consumption of 10.5 mW. The low insertion loss and small phase error make the designed phase switch suitable to be used on radioastronomy receivers (QUIJOTE experiment 26-36 GHz band) minimizing the total system noise temperature.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:22 ,  Issue: 2 )