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Design of dual-band filtering patch antenna slot coupling feed

Published online by Cambridge University Press:  03 February 2025

Tiezhen Jiang Open the ORCID record for Tiezhen Jiang [Opens in a new window] ,
Long Zhuang Open the ORCID record for Long Zhuang [Opens in a new window] ,
Jianhua Wang Open the ORCID record for Jianhua Wang [Opens in a new window]  and
Qi An Open the ORCID record for Qi An [Opens in a new window]
Tiezhen Jiang
Affiliation:
School of Integrated Circuits, Anhui University, Hefei, China
Long Zhuang*
Affiliation:
School of Integrated Circuits, Anhui University, Hefei, China
Jianhua Wang
Affiliation:
School of Integrated Circuits, Anhui University, Hefei, China
Qi An
Affiliation:
School of Integrated Circuits, Anhui University, Hefei, China
*
Corresponding author: Zhuang Long; Email: longzhuang21@126.com
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Abstract

A novel microstrip filtering antenna with slot coupling feed is presented in this work. An asymmetric interdigital coupling structure is used for the feed to excite the patch antenna through gap-fed coupling. Introducing a U-shaped slot on the patch surface modifies the current path to attain different resonant modes. The asymmetric coupled fingers in the low-frequency band generate a radiation null of −64 dBi, while additional resonances introduced in the high band broaden the bandwidth from 4.9 to 5.3 GHz. A horizontally shorted microstrip branch produces another null point of −28 dBi between the bands, enabling steeper roll-off and further improvement in frequency selectivity. The proposed filtering antenna provides a flexible filter response without requiring extra filtering circuits, with appreciable peak gains (6.1 dBi and 7.1 dBi) and stable radiation characteristics. This makes it suitable for WLAN (Wireless Local Area Network) and ISM (Industrial Scientific Medical) systems applications.

Keywords

dual-bandfiltering patch antennaU-shaped slotasymmetric

Information

Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 16 , Special Issue 10: Swedish microwave days 2023 , December 2024 , pp. 1730 - 1738
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Copyright
© The Author(s), 2025. Published by Cambridge University Press in association with The European Microwave Association.

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