Broadband Horizontally Polarized Omnidirectional Antenna for Wi-Fi 6E Application

A broadband horizontally polarized omnidirectional antenna is presented, which consists of four symmetrically printed dipoles and a feeding network. In addition, four pairs of parasitic elliptical patches and four rectangular branches are introduced to produce additional resonant frequencies to broaden the impedance bandwidth. The proposed antenna exhibits a relative impedance bandwidth of 45.9% for
$\mathbf{S}_{11} < -15 \ \mathbf{dB}$
(4.94-7.88 GHz). Meanwhile, the maximum radiation direction of the antenna is around Theta
$=43^{\circ}$
, the gain variation in the horizontal plane (Theta
$=43^{\circ}$
) is less than 0.7 dB from 5.15 GHz to 7.125 GHz. Within this operating band, the cross-polarization level is less than -15.2 dB. Therefore, it can be well applied to indoor ceiling antenna working in Wi-Fi 6E band.