Circularly polarized printed crossed-dipole antenna using branch-line feed network for GPS applications

摘要

This paper presents a printed crossed-dipole antenna with circular polarization for global positioning system (GPS) L1 (1575 MHz) receivers. The antenna structure composed of two printed dipoles located orthogonally, two printed baluns to feed the dipoles and a feed network connected to the baluns. A branch-line coupler with two differential outputs creates the feed network. Accordingly, two orthogonal dipoles are feeding with a 90 degrees phase difference leads to circularly polarization which is suitable for GPS applications. Experimental results confirm that the proposed GPS antenna has an impedance bandwidth of 950 MHz with S11 < -10 dB from 1260 MHz to 2210 MHz, the 3-dB axial ratio bandwidth of 631 MHz with AR < 3 dB, from 1307 MHz to 1938 MHz and a maximum gain of 5.72 dBic. The proposed GPS antenna implemented and tested in the antenna laboratory. (C) 2020 Elsevier GmbH. All rights reserved.