Document Type
Thesis
Date of Award
1-31-1989
Degree Name
Master of Science in Electrical Engineering - (M.S.)
Department
Electrical Engineering
First Advisor
Edip Niver
Second Advisor
Gerald Martin Whitman
Third Advisor
Yunjin Kim
Abstract
The design, fabrication and test of a 45 degree microstrip phase shifter capable of full Ka-band performance is presented. The design uses a Lange coupler with two ports terminated with beam-lead varactor diodes to provide continuous phase shift. Although this concept has been employed at X-band and below, this thesis demonstrates its feasibility for wideband use at frequencies as high as 40 GHz. The design uses thin-film capacitors, beam-lead diodes, simulated grounds, and air bridges to achieve a planar geometry and to simplify the production process. Detailed test results using various test circuits are shown for comparison to actual phase shifter performance. Phase shifter test results show a return loss better than 10 dB from 29.6 to 39.6 GHz, insertion loss less than 7 dB, and a maximum differential phase shift of 42 ±6 degrees for the entire 26.5 to 40 GHz Ka-band. Explanations of unexpected performance anomalies are also described, and methods of corrective action presented. Finally, phase shift enhancement techniques which can provide more than 90 degrees of phase shift are presented.
Recommended Citation
Tanis, William J., "A wideband continuous phase shifter for Ka-band" (1989). Theses. 2931.
https://digitalcommons.njit.edu/theses/2931
