Optimum design of waveguide E-plane stub-loaded phase shifters

Author

Dittloff, Joachim ; Arndt, Fritz ; Grauerholz, Dietrich

Author_Institution

Microwave Dept., Bremen Univ., West Germany

Volume

36

Issue

3

fYear

1988

fDate

3/1/1988 12:00:00 AM

Firstpage

582

Lastpage

587

Abstract

Broadband low-insertion-loss E-plane stub-loaded rectangular waveguide phase shifters are designed with the method of field expansion into normalized eigenmodes, which includes higher-order mode interaction between the step discontinuities. Computer-optimized three-stub prototypes of 90° differential phase shift with reference to an empty waveguide of appropriate length, designed for R140-band (12.4-18 GHz) and R320-band (26.5-40 GHz) waveguides, achieve typically ±0.5° phase shift deviation within about 20% bandwidth. For two-stub designs, the corresponding values are about +2.5°/-1° and 17%. Both designs achieve minimum return loss of 30 dB. The theory is verified by measurements of a compact R120-band (10-15 GHz) waveguide phase shifter design example milled from a solid block, showing measured insertion loss of about 0.1 dB and about +2.5°/-0.5° phase error between 10.7 and 12.7 GHz

Keywords

phase shifters; rectangular waveguides; waveguide components; 10 to 15 GHz; 10.7 to 12.7 GHz; 12.4 to 18 GHz; 26.5 to 40 GHz; 90° differential phase shift; E-plane stub-loaded rectangular waveguide phase shifters; R120-band; R140-band; R320-band; broadband phase shifter; computer optimised three stub prototypes; field expansion; insertion loss; normalized eigenmodes; optimum design; return loss of 30 dB; step discontinuities; two-stub designs; Bandwidth; Design methodology; Loss measurement; Phase measurement; Phase shifters; Prototypes; Rectangular waveguides; Solids; Waveguide discontinuities; Waveguide theory;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.3552

Filename

3552