Near-axis cross-polarization improvement of centre-fed parabolic antennas by partial shaping of the aperture distribution

Autor:	Katsumasa Miyata
Rok vydání:	1983
Předmět:	Physics Parabolic reflector antenna Optics business.industry Dielectric plate Cross polarization Electric field Dielectric Electrical and Electronic Engineering Feed horn business Polarization (waves)
Zdroj:	International Journal of Electronics. 54:847-859
ISSN:	1362-3060 0020-7217
DOI:	10.1080/00207218308938780
Popis:	An attempt to obtain a near-axis cross-polarization suppression of a parabolic reflector antenna has been made with the knowledge that a π-radian phase-difference dielectric plate rotates the polarization of the incident electric field. The antenna used was illuminated at the focus by a conventional simple-structure TE-11 mode feed horn. This was facilitated by mounting dielectric plates on portions of the reflector aperture and then by rotating the principal electric field opposite to the cross-polarized field. Numerical results show that cross-polarization within a − 10 dB angle of the principal beam is remarkably (more than 10 dB) suppressed below − 40 dB if the principal polarization field is properly rotated. Measured results at f = 12.15 GHz, with and without the dielectrics, are presented in this paper for comparison.
Databáze:	OpenAIRE
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