"JOURNAL OF RADIO ELECTRONICS"  N 3, 2015

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INVESTIGATION OF THE INFLUENCE OF REGULAR PHASE ERRORS ON CHARACTERISTICS OF AN AUTO-TRACKING MIRROR PARABOLIC ANTENNA

 

 . I. Lavretski 1, V. S. Chernyshov 2
1 ╬└╬ ź╠╩B Kompas╗, oscow
2 OAO NII of Precise Constructions, Moscow

 

The paper is received on March 11, 2015

 

Abstract: The electrodynamic model was developed and the numerical investigation was performed for a receiving mirror antenna having a multimode conical horn as a fed. We obtained graphs of dependences of magnitudes and phases for circular horn modes , , áand áduring conical scanning around the antenna focal axis. Analysis was performed both for the reflector with a shape of an ideal paraboloid of revolution, and for the same paraboloid with regular surface distortions. It was shown that the phase distortions in antenna produce the oscillations of magnitudes and phases of received horn modes and, as a result, create the distortions of the bearing characteristic of the auto-tracking antenna. We found the maximum allowed level of the phase error giving the 3-dB decrease of the higher modes magnitudes for some angle directions. We estimated the maximum allowed root-mean square deviation of paraboloid reflector surface for using in the auto-tracking mirror antenna.

Key words: a mirror parabolic antenna, regular phase errors, auto-tracking, a circular conical horn, high-order modes.