AN OUT-OF-LINE SERIES-FED MICROSTRIP ARRAY FED BY NOVEL CURLED-HORN-SHAPED STUB WITH LOW CROSS-POLARIZATION

Abstract

A novel out-of-line series-fed patch array with low cross- polarization is presented in this paper. The element in the array is fed by a stub through one-port. The feeding stub is designed to be a novel curled-horn-shaped geometry, which can efiectively suppress the cross-polarization due to its symmetry. The linear array consists of two identical subarrays which are located oppositely. By the antiphase feeding of two subarrays, the cross-polarization is further reduced. Furthermore, the theory analyses of the series-fed array indicate that it is competent for being applied to phased array systems. The simulated results show the cross-polarization levels of the linear array with 20 novel elements in E and H plane are lower than i30dB and i60dB, respectively. And, a prototype array is fabricated. Its low cross- polarization levels conflrm the efiective performance of the proposed design.