Beam-waveguide feed - With frequency-reuse diplexer for satellite communication earth station
Abstract
The principal design considerations for the feed horn, beam-waveguide mirror geometry, and diplexer configuration for a new Cassegrain antenna feed are given, in relation to achieving a system with greater than 40 dB polarization purity near boresight and negligible loss in efficiency. For circular polarization, this corresponds to an axial ratio of less than 1.06. The beam-waveguide feed characteristics measured on a one-third scale model verified isolation between the predicted 40-dB co-polarized and cross-polarized patterns in the vicinity of boresight. The measured results on the feed horn/diplexer assembly show that the desired polarization isolation is maintained over the entire band.
- Publication:
-
Microwave Journal
- Pub Date:
- November 1975
- Bibcode:
- 1975MiJo...18...51S
- Keywords:
-
- Antenna Design;
- Antenna Feeds;
- Beam Waveguides;
- Diplexers;
- Frequency Reuse;
- Optical Waveguides;
- Satellite Communication;
- Antenna Radiation Patterns;
- Circular Polarization;
- False Alarms;
- Frequency Distribution;
- Ground Stations;
- Horn Antennas;
- Polarization Characteristics;
- Scale Models;
- Communications and Radar