A family of two-reflector antennas with identical dielectric primary feeds
Abstract
A family of three types of confocal two-reflector antennas using the same dielectric feed technique are described. The dielectric rod for C/V approximately equal to 1 is a primary feed with excellent cross-polarization properties. It also serves as a small reflection carrier, i.e., there is no need for support struts which overshadow the antenna aperture. Experiments have shown cross-polarization levels of less than -30 dB. All the antennas described have almost identical cross-polarization characteristics, but they are somewhat different in gain. While the usual dielectric antenna has a typical gain of 10-15 DB and the backfire antenna has a typical gain of 18-25 dB, the Cassegrain and Gregory antennas are more suitable when gains higher than 35-40 dB are required.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf..358K
- Keywords:
-
- Antenna Feeds;
- Antenna Radiation Patterns;
- Cassegrain Antennas;
- Dielectrics;
- Parabolic Reflectors;
- Reflector Antennas;
- Two Reflector Antennas;
- Apertures;
- Backfire Antennas;
- Cross Polarization;
- Far Fields;
- Communications and Radar