INVESTIGATION OF THE INFLUENCE OF REGULAR PHASE ERRORS ON CHARACTERISTICS OF
AN AUTO-TRACKING MIRROR PARABOLIC ANTENNA
I. Lavretski 1,
V. S. Chernyshov 2
OAO NII of Precise
The paper is
received on March
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.