An Optically Transparent Metasurface-Based Resonant Cavity Fed by Patch Antenna for Improved Gain

Area of Science:

• Electromagnetics and Metamaterials
• Optoelectronics
• Antenna Engineering

Background:

• Metasurfaces (MS) offer unique electromagnetic properties.
• Transparent conducting films (TCF) are crucial for integrating electronics with optical transparency.
• Patch antennas require performance enhancements for various applications.

Purpose of the Study:

• To propose and design an optically transparent metasurface (MS) for a 5.6 GHz patch antenna.
• To enhance the gain of a resonant cavity antenna using the transparent MS.
• To investigate the optical and electrical properties of the metasurface.

Main Methods:

• Design and simulation of a metasurface using a transparent micro metal mesh conductive (MMMC) film.
• Integration of the MS with a patch antenna and a half-wavelength cavity.
• Analysis of antenna performance, including gain and impedance bandwidth (IMBW), using CST software.
• Evaluation of optical transmittance and sheet resistance of the MMMC film.

Main Results:

• The transparent MS achieved a simulated boresight gain of 13.2 dBi, an 8.5 dB improvement over the antenna without MS.
• The metasurface exhibited high optical transmittance (>75%) and low sheet resistance (0.7 Ω/sq).
• The impedance bandwidth was minimally affected by the addition of the metasurface.
• Losses were found to be minimal for the MMMC-based MS.

Conclusions:

• The proposed optically transparent metasurface effectively enhances patch antenna gain.
• The MMMC film provides a viable solution for TCFs in transparent antenna designs.
• The metasurface antenna demonstrates potential for applications requiring both high gain and optical transparency.