Loop Antenna for Wi-Fi 6/6E Application

This paper introduces a horizontally polarized, low-profile loop antenna. The antenna features a printed circular segmented loop loaded with capacitor varactors. By adjusting the capacitive varactors, the antenna has a broadband impedance bandwidth with a directive radiation pattern. The antenna's symmetrical design is fed by multiple coaxial cables, allowing electronic steering of the antenna beam in the azimuth plane by tuning the varactor diodes when it works in directive mode. Simulation shows an impedance bandwidth of 2.1 GHz (15<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf>1 < -10 dB) cover from 5.0 to 7.1 GHz. The maximum radiation efficiency of 95 % provides the realized gain of 2.5 dBi, making these antennas suitable for Wi-Fi 6/6E applications.