Abstract
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 metal 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 passband are achieved. The proposed antenna is implemented to demonstrate an impedance bandwidth of 7.6% from 3.41 to 3.68 GHz and a maximum gain of 4.6 dBi.
Highlights
In recent years, optical transparent antennas are gaining increasing attention in both the academia and industry due to their see-through characteristic. Since they can be seamlessly attached to automotive windscreens, solar panels, display panels, building windows as well as indoor ceilings and walls, they present great potential for applications in satellite communications, mobile communications and indoor wireless communications
The proposed antenna features threefold advantage of enhanced impedance bandwidth, good filtering response and good optical transparency compared to the traditional proximity-coupled-fed patch antenna
Featuring no requirement of drilling and intact ground plane, the transparent proximity-coupled-fed patch antenna is undoubtedly a good candidate to be attached to indoor ceilings and walls for indoor wireless communications or on windshields of vehicles for vehicle-to-vehicle communications
Summary
Optical transparent antennas are gaining increasing attention in both the academia and industry due to their see-through characteristic. One common approach to design transparent antenna is the use of the transparent conducting oxides (TCOs) such as indium tin oxide (ITO) [1], [2] and silver-coated polyester (AgHT) films [3], [4]. These films always suffer from high sheet resistance subject to their intrinsic characteristic. The proposed antenna features threefold advantage of enhanced impedance bandwidth, good filtering response and good optical transparency compared to the traditional proximity-coupled-fed patch antenna
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