A Transparent Proximity Coupled Fed Patch Antenna with Enhanced Bandwidth and Filtering Response

This paper introduces a novel transparent proximity-coupled-fed patch antenna with enhanced impedance bandwidth and good filtering response. The proposed antenna consists of a ground plane, a specific feeding structure, and a slotted patch. All the conducting surfaces are realized with silver meshes printed on glass substrates. Optical transparency of the antenna depends on the mesh density. The feed line of a traditional proximity-coupled-fed patch antenna is terminated with a driven stub etched with a half-wavelength U-shaped slot. This modification introduces an additional resonant mode but also a radiating null. By further etching a pair of quarter-wavelength open slots on the radiating patch, another resonant mode accompanied with an extra radiation null is generated. Finally, three resonant modes within the operating band along with two radiation nulls near the two edges of the pass band are achieved.

Keywords:  Transparent antenna, filtering antenna, proximity coupled fed, Bandwidth enhancement.