A Filtering Antenna Based on Etched Interdigital Structure for Dual-Band High Selectivity

Abstract

A dual-band filtering antenna, comprising a quasi-Yagi antenna and similar etched interdigital structures featuring high selectivity and wide impedance bandwidth, is proposed and analysed in this paper. Differing from the existing filtering antennas, the performance of the novel one can be improved with the help of the proposed interdigital structure etched on metallic ground instead of adding parasitic strips connected to the feedline of the top layer. Moreover, the proposed low-profile antenna performs as expected; the peak gain is 5.1 dBi and relative impedance bandwidth surpasses 36.4% in the former band within 3.6–5.2 GHz compared to conventional antennas. Meanwhile, it will work with the similar performance in multi-band due to the arrangement of symmetric etched interdigitals. For verification, a 35 × 55 × 1-mm³ prototype operating in dual-band is fabricated and experimented to compare with simulated results. In the end, the measured results are found in a good agreement with those of the simulated ones in designed band.

Keywords:

• Dual-band
• Filtering antenna
• High selectivity
• Interdigital structure

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

This work was supported by National Natural Science Foundation of China [grant number 61961006].

Notes on contributors

Xiaokun Yang

Xiaokun Yang was born in Hubei, China, in 1993. He received the BEng degree from Wuhan Institute of Technology University in 2016, and the MEng degree from Guizhou University in 2019, respectively. He is currently pursuing PhD from the Guizhou University, Guiyang, China. His research interests include antennas, WPT and NFC. Email: [email protected]

Ding Zhao

Zhao Ding was born in Guizhou, China. He received the BE degree in Physics from Wuhan University, Wuhan, China, in 1985, and the PhD degree in Physics from the University of Arkansas, Fayetteville, AR USA, in 2002. He is currently a professor with the College of Big Data and Information Engineering, Guizhou University, Guiyang, China. His research interests include low dimension semiconductor materials and microwave power devices. Email: [email protected]

Zhengping Zhang

Zhengping Zhang was born in Guizhou, China. He received the BE degree from Tongji University, Shanghai, China, in 1985, and the PhD degree in microelectronics and solid state electronics from Zhejiang University, Hangzhou, China, in 2003. He is currently a professor with the College of Big Data and Information Engineering, Guizhou University, Guiyang, China. His research interest includes the theory of antennas.