A Cross Polarization Suppressed Sequential Array with L-Probe Fed Rectangular Microstrip Antennas

Kazuki IKEDA  Keigo SATO  Ken-ichi KAGOSHIMA  Shigeki OBOTE  Atsushi TOMIKI  Tomoaki TODA  

IEICE TRANSACTIONS on Communications   Vol.E94-B   No.9   pp.2653-2655
Publication Date: 2011/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E94.B.2653
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Antennas and Propagation
cross polarization suppression,  sequential array,  rectangular patch,  

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In this paper, we present a sequentially rotated array antenna with a rectangular patch MSA fed by an L-probe. Since it's important to decrease couplings between patch elements in order to suppress the cross-polarization level, rectangular patches with aspect ratio of k are adopted. We investigate the cross-polarization level of the sequential array and discuss the relationship between the cross-polarization level and the mutual coupling. As a result, the bandwdith of the antenna element is obtained 14.6% when its VSWR is less than 1.5, and the directivity and cross-polarization level of a 4-patch sequential array are 10.8 dBic and 1.7 dBic, respectively, where k=0.6 and the patch spacing of d=0.5 wave length. These characteristics are 5.6 dB and 5.8 dB better than the corresponding values of a square patch sequential array antenna.