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).
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Guo et al. (2007) studied this question.