An optically transparent coplanar L-probe fed antenna based on capacitively coupled array of patches

Abstract

An optically transparent antenna fed by a coplanar L-probe is proposed in this paper. Indium-doped tin oxide (ITO) with a sheet resistance of 3.5 Ω/sq etched on a soda-lime glass substrate is used as radiation array and ground to achieve high optical transmittance. TM${}_{10}$ and TM${}_{20}$ modes are excited simultaneously to expand work bandwidth. The fabricated antenna achieves a –10 dB reflection bandwidth of 27.5% from 4.7 to 6.2 GHz with the overall size of 42 mm × 42 mm × 3.3 mm. Different from many antennas composed of ITO, the proposed antenna exhibits directional radiation patterns with the maximum realized gain of 4.6 dBi and the maximum efficiency of 61%. Meanwhile, the optical transmittance of the antenna can reach above 58%.

Keywords:

• Optical transmittance
• antenna
• gain
• indium-doped tin oxide (ITO)

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Shaanxi Natural Science Basic Research Project of Shaanxi science and Technology Office[No. 2023-JC-QN-0673]the National Natural Science Foundations of China[No. 61971340 and 62122061].

Notes on contributors

Pingle Liang

Pingle Liang received the B.E. degree in electronic and information engineering from Chongqing University, Chongqing, China, in 2021. He is currently working toward the M.E. degree in Information and communication Engineering with the School of Information and communications Engineering, Xi'an Jiaotong University, Xi'an, China. His research interests include optically transparent antennas and ground penetrating radar antennas.

Juan Chen

Juan Chen was born in Chongqing, China. She received the Ph.D. degree from Xi'an Jiaotong University, Xi'an, China, in 2008, in electromagnetic field and microwave technology. She is currently working in Xi'an Jiaotong University, Xi'an, China, as a professor. Her research interests include the computational electromagnetics, microwave device design, etc.