Wang-shaped Patch Antenna with a Simple Feed Network

Abstract— Microstrip patch antennas have attracted much attention of antenna engineers due to its low production cost and low profile. Its narrow bandwidth is a major disadvantage that limits its applications. Bandwidth broadening techniques such as the inclusion of U-slot [1] on a rectangular patch, the E-shaped patch [2], or the patch added with a pair of wide-slits [3] have been reported for the purposes of enhancing impedance bandwidth. These techniques are all about to generate the additional nearby resonances by creating the extra current paths on the patch so that a wide impedance/return-loss bandwidth can be obtained by merging the resonant frequencies whilst pushing the return losses above 10-dB (reflection coefficient below −10 dB). The U-slotted the E-shaped patch and/or the patch included a pair of wide-slits designs are capable of achieving more than
10-dB return-loss of 25% at the centre frequency but suffering from the asymmetrical radiation pattern in E-plane and/or high cross-polar levels in H-plane [1–3].