Cross-polarization characteristics of aperture antennas
Abstract
Degradation of the cross-polarization discrimination caused by antenna imperfections is discussed. Using a 20-GHz aperture antenna it is experimentally established that the cross-polarization characteristics are closely related to elliptical polarization of radiation fields. Theoretical results for the cross-polarization characteristics agree well with measurements, from which the existence of a geometrical distortion of the main reflector is observed. The cross-polarization characteristics are found to be very sensitive to misalignment of the paired antennas. The characteristics are improved by (1) eliminating field distortions at the aperture with azimuthal period of 180 deg, (2) letting the axis of symmetry for field distortion, if any, coincide with the plane of polarization, and (3) using scalar fields of the primary radiator.
- Publication:
-
Electronics Communications of Japan
- Pub Date:
- June 1976
- Bibcode:
- 1976JElCo..59...94T
- Keywords:
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- Cassegrain Antennas;
- Cross Polarization;
- Microwave Antennas;
- Polarization Characteristics;
- Antenna Arrays;
- Elliptical Polarization;
- Error Analysis;
- Horn Antennas;
- Pulse Communication;
- Reflectors;
- Communications and Radar