Bandwidth improvement of differential‐fed patch antenna with out‐of‐band rejection using SISL technology

Abstract

A coupled differential‐fed patch antenna printed on the low‐cost FR‐4 substrate based on substrate integrated suspended line technique is proposed for wireless applications. A stacked patch is introduced on the top of the proposed antenna for bandwidth enhancement. Two symmetrical rectangular parasitic patches are placed close to the stacked patch to further enhance the bandwidth. Thus, the radiation null at the high band‐edge is generated, and 12.5% of the fractional bandwidth is obtained. The front‐to‐back ratio is greater than 18 dB at operating frequencies from 4.73 to 5.36 GHz. The measured boresight gain of the antenna is 10.8 dBi, and the radiation efficiency is 92%.

Characteristic modal analysis in miniaturization and bandwidth‐enhancement of monopole antenna for WLAN/WiMAX/LTE applications

“…This improved the bandwidth from 107.7% to 135%. In Aminu et al, 11 a coupled differential‐fed patch antenna is proposed. The bandwidth of the antenna is improved from 5.4% to 8.5% by introducing a stacked patch on top of the main radiating patch.…”