Horizontally polarized wideband antenna based on quarter-wavelength slot elements

Abstract

A horizontally polarized (HP) wideband antenna is designed and analyzed for wireless communication in this communication. The HP antenna is a combination of four quarter-wavelength slot elements, and fed by a wideband power divider with equal amplitude and zero phase difference output signals. Equivalent to the current loop, four slot elements rotate around the center of proposed structure, which gives rise to a monopolar radiation pattern. A prototype is designed, fabricated and measured. The results show that a deep null more than 20 dB appears in the broadside of the elevation plane radiation pattern. And a small ripple less than 2 dB in azimuth plane radiation pattern is obtained. The antenna has a wide impedance band of 33.3% for S11 <−10 dB and a cross-polarization level lower than 15 dB.