Theory and design of a Ku-band TE/21/-mode coupler
Abstract
A design procedure for a Ku-band TE(21)-mode tracking coupler for satellite earth station communication antennas which require autotrack capability is developed using mode-coupling theory. The TE(21) mode is generated by the coupler without a phase shift since it is geometrically symmetric. It is shown that the tracking mode does not interfere with the dominant mode due to an isolation of more than 40 dB between the two modes. Wideband (25% bandwidth) tracking with coupling loss variation from 0.3-1.3 dB is possible using this type of coupler, and a 40% bandwidth with less than 2.0 dB coupling loss has been measured. The VSWR of the coupler is found to be less than 1.06 for about 80% bandwidth.
- Publication:
-
IEEE Transactions on Microwave Theory Techniques
- Pub Date:
- November 1982
- DOI:
- 10.1109/TMTT.1982.1131335
- Bibcode:
- 1982ITMTT..30.1862C
- Keywords:
-
- Antenna Couplers;
- Antenna Design;
- Coupled Modes;
- Microwave Antennas;
- Satellite Ground Support;
- Superhigh Frequencies;
- Antenna Feeds;
- Antenna Radiation Patterns;
- Communication Satellites;
- Directional Antennas;
- Waveguide Antennas;
- Electronics and Electrical Engineering