A. Yu. Grinev – Dr.Sc. (Eng.), Professor, Moscow Aviation Institute (National Research University) E-mail: grinevau@yandex.ru

E. V. Ilyin – Ph.D. (Eng.), Associate Professor, Moscow Aviation Institute (National Research University) E-mail: jenyay.ilin@gmail.com

D. A. Evseev – Engineer, JSC “MIC Mashinostroyenia”

E-mail: dima-evs16@mail.ru

This paper discusses polarization properties of electronically scanned array (ESA) antennas aimed for linear polarization waves radiation which utilize microstrip patch elements. The reasons of cross-polarization radiation emission and its effect on accuracy characteristics of monopulse ESAs are also discussed. Approaches to suppression of interfering cross-polarization radiation are considered including symmetrical out-of-phase patches' excitation, introduction of artificial defect in ground structure, polarizer arrangement in front of ESA. The polarizer gives additional 28 dB suppression of cross-polarization at 45° scan angle and 11 dB suppression at 60°.

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