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Circular monopole filtering antenna with improved sideband selectivity and in-band impedance using circular-stub-load resonator

Published online by Cambridge University Press:  13 June 2022

Hailong Yang Open the ORCID record for Hailong Yang [Opens in a new window] ,
JinSheng Zhang ,
Xuping Li ,
Rongji Li ,
Yunqi Zhang ,
Yapeng Li ,
Xueyan Song  and
Xiaomin Shi
Hailong Yang*
Affiliation:
Department of Electronic and Information Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China Control Science and Engineering from the Xi'an Research Institute of High-Tech, Xi'an 710024, China
JinSheng Zhang*
Affiliation:
Control Science and Engineering from the Xi'an Research Institute of High-Tech, Xi'an 710024, China
Xuping Li
Affiliation:
Department of Electronic and Information Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China
Rongji Li
Affiliation:
Department of Electronic and Information Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China
Yunqi Zhang
Affiliation:
Department of Electronic and Information Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China
Yapeng Li
Affiliation:
Department of Electronic and Information Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China
Xueyan Song
Affiliation:
Department of Electronic and Information Engineering, Xi'an University of Posts & Telecommunications, Xi'an 710121, China
Xiaomin Shi
Affiliation:
Xi'an Shiyou University, Xi'an 710300, China
*
Authors for correspondence: Hailong Yang, E-mail: yanghl68@163.com; JinSheng Zhang, E-mail: 35118796@qq.com
Authors for correspondence: Hailong Yang, E-mail: yanghl68@163.com; JinSheng Zhang, E-mail: 35118796@qq.com
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Abstract

In the design of the filter antenna, the filter unit with the same structure as the radiation patch not only improves the selectivity of the band edge, but also helps to improve the in-band impedance. In this design, a compact circular monopole filtering antenna with improved sideband selectivity and in-band impedance using a circular-stub-load resonator is proposed. To obtain better sideband selection characteristics and in-band impedance characteristics, and reduce the mismatch problem caused by the introduction of the filter, a branch-loaded filter with the same resonance mode as the antenna radiation patch is designed. In addition, different shape branch loading structures of the bandpass filter are also studied. The experimental results show that when the loading unit of the filter and the radiation structure of the antenna have the same structure, both good in-band impedance characteristics and sideband selectivity characteristics can be obtained from the filter antenna. The antenna reflection coefficient bandwidth is from 3 to 11 GHz (114%), and the maximum reflection coefficient is only −15 dB, showing good in-band impedance characteristics and sideband selection characteristics. The filter antenna realizes the integration of antenna filtering without increasing the size, and the final size of the antenna is 30 × 25 mm2.

Keywords

Circular-stub-load resonator (CSLR)monopole antennasideband selectivity
Type
Antenna Design, Modeling and Measurements
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Issue 4 , May 2023 , pp. 665 - 673
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Copyright
© The Author(s), 2022. Published by Cambridge University Press in association with the European Microwave Association

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