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Design of a miniature dual-band bandpass filter with interlocked stepped-impedance resonators for 5G new radio access technology

Part of: EuMW Special issue 2019

Published online by Cambridge University Press:  30 July 2020

Wei-Lun Hsu ,
Pei-Yu Lyu Open the ORCID record for Pei-Yu Lyu [Opens in a new window]  and
Sheng-Fuh Chang
Wei-Lun Hsu
Affiliation:
Department of Electrical Engineering, National Chung Cheng University, Chia-Yi County, Taiwan
Pei-Yu Lyu*
Affiliation:
Department of Electrical Engineering, National Chung Cheng University, Chia-Yi County, Taiwan
Sheng-Fuh Chang
Affiliation:
Department of Electrical Engineering, National Chung Cheng University, Chia-Yi County, Taiwan Center for Telecommunication Research, National Chung Cheng University, Chia-Yi County, Taiwan AIM-HI, National Chung Cheng University, Chia-Yi County, Taiwan
*
Author for correspondence: Pei-Yu Lyu, E-mail: jade9197@gmail.com
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Abstract

A miniature dual-band bandpass filter with interlocked stepped-impedance resonators (SIRs) is presented in this paper, which was designed for the student design competition held in European Microwave Week 2019. This bandpass filter is required to have two concurrent passbands, namely, the first passband at 900–1000 MHz and the second passband at 1427–1518 MHz bands, which cover six designated bands in sub-6 GHz range of fifth generation (5G) New Radio Access Technology. Three stopbands are required at 500–850, 1050–1350, and 1600–2000 MHz, respectively. To achieve the best figure of merit, an interlocked configuration of two SIRs is proposed. One advantage is that the impedance ratio of the inter-locked SIR can be controlled to have two passbands at the required frequencies. Second, the coupling section of the interlocked SIR gives three transmission zeros distributed to every stopbands such that the stopband suppression are dramatically enhanced. The measured results show that the passband insertion losses are 2.16 dB at the first passband and 1.33 dB at the second passband, and the return losses are greater than 10 dB. The stopband suppression at the transmission zeros are greater than 38 dB. The circuit is very compact as 41.40 × 19.96 mm2, equivalent to $0.25 \times 0.12\,\lambda _g^2$.

Keywords

Microstrip filterstepped-impedance resonators (SIR)
Type
Research Paper
Information
International Journal of Microwave and Wireless Technologies , Volume 12 , Special Issue 8: Special Issue EuMW 2019. Part II , October 2020 , pp. 733 - 737
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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