Feeds for reflector antennas - A review
Abstract
A review of progress made in feed modes for satellite broadcasting is presented. Hybrid mode feeds are discussed in terms of performance characteristics and current usage. They feature both electric and magnetic longitudinal field components, thus allowing radiation pattern symmetry and low cross polarization in the 45 deg planes. The most common hybrid mode antenna is presently the corrugated horn, such as on COMSTAR. It is noted that hybrid modes have azimuthal dependence, while circularly symmetric fields are constrained to pure modes. Cylindrical or conical wave guides are employed to receive and transmit pure modes. Component characteristics of pure and mixed mode feeds are described, and advantages which array feeds hold over single element feeds are outlined, as are projections of future improvements in feed designs.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf..309C
- Keywords:
-
- Antenna Design;
- Antenna Feeds;
- Broadcasting;
- Horn Antennas;
- Microwave Antennas;
- Reflector Antennas;
- Satellite Antennas;
- Antenna Arrays;
- Antenna Components;
- Antenna Radiation Patterns;
- Cross Polarization;
- Hybrid Circuits;
- Technological Forecasting;
- Waveguide Antennas;
- Communications and Radar