Design of an X-Band PIN Diode Phase Shifter by Computer Optimization (Ontwerp van een X-Band PIN-Diode Fasedraaier m.b.v. Computeroptimalisatie).

摘要

This report describes the design and experimental results of a four bit microstrip diode phase shifter in the frequency band of 9.0 to 10.0 GHz. The phase shifter has been built on an alumina substrate and the desired differential phase shift is reached by switching transmission lines by PIN diodes. The lay-out of the circuits was designed for minimum physical dimensions. Three circuits have been realized with good results. The circuit containing the 22.5 and 45 degree bit, gives an insertion loss of 0.75 dB and a maximum phase deviation of less than 3.5 degrees. The circuit containing the 90 and 180 degree bits, gives an insertion loss of 1.3 dB. The average phase shift of the 90 degree bit is not optimal (98 degrees) but the phase deviation in regard to the average phase shift is less than 1.7 degrees. The 180 degree bit gives a phase deviation of less than 4.5 degree. The four bit phase shifter good results for both insertion loss and differential phase shift, but still has serious problems with the input impedance match. Netherlands. (rh)