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Distributed analog phase shifters with low insertion loss

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2 Author(s)
A. S. Nagra ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; R. A. York

This paper describes the design and fabrication of distributed analog phase-shifter circuits. The phase shifters consist of coplanar-waveguide (CPW) lines that are periodically loaded with varactor diodes. The circuits are fabricated on GaAs using standard monolithic processing techniques. The phase velocity on these varactor diode-loaded CPW lines is a function of applied reverse bias, thus resulting in analog phase-shifting circuits. Optimally designed circuits exhibit 0°-360° phase shift at 20 GHz with a maximum insertion loss (IL) of 4.2 dB. To the best of our knowledge, this is the lowest reported IL for a solid-state analog phase shifter operating at 20 GHz

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:47 ,  Issue: 9 )