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Selectivity and in-band impedance enhancement of a compact slot antenna with defected ground structures

Published online by Cambridge University Press:  27 May 2019

Hailong Yang
Affiliation:
Faculty of Automation and Information Engineering, Shaanxi Key Laboratory of Complex System Control and Intelligent, Xian University of Technology, Xian, 710048, People's Republic of China
Xiaoli Xi*
Affiliation:
Faculty of Automation and Information Engineering, Shaanxi Key Laboratory of Complex System Control and Intelligent, Xian University of Technology, Xian, 710048, People's Republic of China
Lili Wang
Affiliation:
Faculty of Automation and Information Engineering, Shaanxi Key Laboratory of Complex System Control and Intelligent, Xian University of Technology, Xian, 710048, People's Republic of China
Yuchen Zhao
Affiliation:
Faculty of Automation and Information Engineering, Shaanxi Key Laboratory of Complex System Control and Intelligent, Xian University of Technology, Xian, 710048, People's Republic of China
Xiaomin Shi
Affiliation:
Communication Engineering Department, Xi'an Shiyou University, Xi'an, People's Republic of China
*
Author for correspondence: Xiaoli Xi, E-mail: xixiaoli@xaut.edu.cn

Abstract

In this study, a new ultra-wideband (UWB) band-edge selectivity antenna with a modified radiation slot using defected ground structure (DGS) is presented to obtain bandpass filtering reflection coefficient and gain performance. The well-designed DGS is designed on backside metallic of the substrate and can be seen as a low-pass filter that provides a good roll-off at a higher frequency. By connecting the DGS and the stepped slot and making them merge with each other, good cut-off property in the upper passband and better in-band impedance characteristics are obtained. Measured results show that the proposed design not only shows good band-edge selectivity in reflection coefficient and gain performance but also has a good impedance matching of −13.5 dB reflection coefficients and a good radiation efficiency of 90% in the operating frequencies. The measured bandwidth defined with the reflection coefficient less than −10 dB is from 3.1–11.2 GHz. Furthermore, the size of the filtering UWB antenna is 22 mm × 12 mm, which is smaller than many individual UWB antennas and UWB filters.

Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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