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Published March 1987 | Published
Journal Article Open

A Low-Loss Ku-Band Monolithic Analog Phase Shifter


A GaAs monolithic Ku-band analog phase shifter integrating 90° branch line coupler with planar varactor diodes has been fabricated for the first time. A phase shift of 109° +- 3° with an insertion loss of 1.8+-0.3 dB was measured from 16 to 18 GHz. A 360° phase shifter with 4.2+-0.9 dB insertion loss was realized in the same frequency range by connecting three phase-shifter chips in series. To our knowledge, this is the lowest insertion loss obtained by a 360° Ku-band phase shifter using monolithic circuits. In addition, hyperabrupt varactors using nonuniform doping profiles increased the phase shift by more than 30° and produced a more linear dependence of phase shift on control voltage.

Additional Information

© 1987 IEEE. Manuscript received July 12, 1986; revised October 10, 1986. This work was supported in part by the Department of the Army and the Department of the Air Force. The authors wish to thank K. M. Molvar and D. J. Burrows for circuit fabrications, L. Cociani for RF measurements, J. R. LaFranchise for mask design, D. J. Landers for packaging, and W. F. Dinatale for the SEM work. The authors are also indebted to R. W. Sudbury and R. A. Murphy for many helpful discussions.

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