Broadband low cross-polarization patch antenna
Article first published online: 23 OCT 2007
Copyright 2007 by the American Geophysical Union.
Volume 42, Issue 5, October 2007
How to Cite
2007), Broadband low cross-polarization patch antenna, Radio Sci., 42, RS5008, doi:10.1029/2006RS003595., , , and (
- Issue published online: 23 OCT 2007
- Article first published online: 23 OCT 2007
- Manuscript Accepted: 21 AUG 2007
- Manuscript Revised: 24 JUL 2007
- Manuscript Received: 27 NOV 2006
- microstrip antennas;
- wideband antennas;
- low cross-polarization antennas
 A broadband 180° microstrip balun is employed as a feed network for the L-probe square patch antenna. The broadband balun delivers impedance matching, equal amplitude power division, and consistent 180° (±10°) phase shifting over a wide band (∼45%). We demonstrate that the use of the 180° broadband balun affords significant H-plane cross-polarization suppression across the wide impedance bandwidth designed for L-probe patch antennas. The antenna using the 180° broadband balun exhibits a measured impedance bandwidth (SWR < 2) of 37.15%, from 1.6 to 2.33 GHz. Across our bandwidth of interest (1.7 to 2.3 GHz), the measured boresight gain ranges from 6.16 to 8.5 dBi, and the measured H-plane cross-polarization levels are consistently well suppressed (<−20 dB).