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Compact wideband filtering Balun Based on SISL Technology

Published online by Cambridge University Press:  29 June 2023

Yongliang Zhang Open the ORCID record for Yongliang Zhang [Opens in a new window] ,
Huan Zhou ,
Linping Feng ,
Xianfang Zhang ,
Xiaoping Zhang  and
Weimin Shi
Yongliang Zhang
Affiliation:
Department of Transportation Institute, Inner Mongolia University, Inner Mongolia, China Department of Electronics and Information Engineering, Inner Mongolia University, Inner Mongolia, China
Huan Zhou
Affiliation:
Department of Electronics and Information Engineering, Inner Mongolia University, Inner Mongolia, China
Linping Feng*
Affiliation:
Department of Electronics and Information Engineering, Xi’an Jiaotong University, Xi’an, China Department of Microelectronics, Xi’an Jiaotong University, Xi’an, China
Xianfang Zhang
Affiliation:
Department of Electronics and Information Engineering, Inner Mongolia University, Inner Mongolia, China
Xiaoping Zhang
Affiliation:
Department of the State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau, China
Weimin Shi
Affiliation:
Department of Microelectronics and Communication Engineering, Chongqing University, Chongqing, China
*
Corresponding author: Linping Feng; Email: fenglinpingee@126.com
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Abstract

A new compact wideband filtering balun based on substrate-integrated suspended line technology is presented in this brief. The proposed device is composed of a λg/4 suspended stripline open-circuited stub, a λg/2 suspended stripline resonator, and a λg/2 suspended slotline resonator. These striplines and slotline are encapsulated in an electromagnetic (EM) shielding box consisting of air cavity, surrounding substrate layers, and metal layers to achieve EM shielding performance. By properly exciting the suspended stripline and slotline resonators, three transmission poles are generated to achieve high frequency selectively. The intrinsic 180∘ phase difference between the two output ports can be obtained by using the electric field distribution caused by the perpendicular coupling between the suspension stripline and the slotline resonator. The wideband passband is achieved with magnitude balance and out-of-phase properties. To validate our proposal, a wideband filtering balun operating at 2.56 GHz with fractional bandwidth of 65.6% is designed and fabricated.

Keywords

filtering balunsubstrate-integrated suspended linetriple-mode resonatorwideband
Type
Passive Components and Circuits
Information
International Journal of Microwave and Wireless Technologies , Volume 15 , Special Issue 10: JNM 2022 Special Issue , December 2023 , pp. 1656 - 1661
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Copyright
© The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association

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