A shaped offset dual reflector antenna with high gain and low sidelobe levels
Abstract
A shaped offset dual reflector antenna and an ancillary new synthesizing procedure for the reflectors are discussed. The procedure is described, including the determination of the r-theta and the bipolar coordinate relations, and the determination of a(r). The final reflector and main antenna characteristics are discussed along with the aperture field distribution and the beam steering through feed system deflections. The main characteristics are: high gain of only a few tenths of dBs below 100 percent: sidelobe levels below -22 dB: low crosspolarization of less than -38 dB linear or 0.025 deg squint angle for circularly polarized fields; steering capability of approximately + or - 2 beamwidths in elevation and azimuth through feed system deflections; and 'compact' geometry and minimal problems with snow accumulation in the main reflector in satellite systems.
- Publication:
-
2nd International Conference on Antennas and Propagation
- Pub Date:
- 1981
- Bibcode:
- 1981icap.conf..163B
- Keywords:
-
- Antenna Design;
- Satellite Antennas;
- Sidelobes;
- Steerable Antennas;
- Two Reflector Antennas;
- Antenna Feeds;
- Antenna Radiation Patterns;
- Apertures;
- Circular Polarization;
- Communications and Radar