Balanced dual-wideband BPF utilizing quad-mode slotline resonator

Xu Jiang; Hong-Yu Liu; Xin-Peng Ding; Gang Jin; Feng Wei

doi:10.1515/freq-2024-0335

Article

Balanced dual-wideband BPF utilizing quad-mode slotline resonator

Xu Jiang , Hong-Yu Liu , Xin-Peng Ding , Gang Jin and Feng Wei

Published/Copyright: June 12, 2025

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From the journal Frequenz Volume 79 Issue 9-10

Abstract

In this paper, a balanced dual-wideband BPF based on a novel quad-mode slotline resonator is proposed, achieving flexible, wide differential-mode (DM) bandwidths and high intrinsic common-mode (CM) suppression. With the application of the quad-mode slotline resonator, four transmission poles (TPs) are generated, leading to the creation of two wide DM passbands. The positions of these TPs can be flexibly adjusted by controlling the length of resonator. Meanwhile, utilizing quad-mode slotline resonator avoids multiple energy conversions between the slotline and microstrip line, simplifying the design and reducing overall size. In order to achieve intrinsic CM suppression, the BPF utilizes a microstrip/slotline structure, enabling the DM circuit to be designed independently of the CM circuit model, which greatly simplified the design procedure and thereby achieving excellent CM suppression. For the purpose of demonstrating the theoretical design, a dual-band BPF operating at 1.60 GHz and 3.75 GHz with bandwidths of 1,072 MHz and 1,088 MHz is fabricated. The results show good agreement between the simulations and measurements.

Keywords: balanced BPF; dual-wideband BPF; intrinsic common-mode suppression; quad-mode slotline resonator

Corresponding author: Gang Jin, Faculty of Integrated Circuit, Xidian University, Xi’an 710071, China, E-mail: gjin@xidian.edu.cn

Funding source: Fundamental Research Funds for the Central Universities

Funding source: Innovation Fund of Xidian University

Research ethics: Not applicable.
Informed consent: Not applicable.
Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.
Use of Large Language Models, AI and Machine Learning Tools: None declared.
Conflict of interest: The author states no conflict of interest.
Research funding: None declared.
Data availability: Not applicable.

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Received: 2024-10-31

Accepted: 2025-05-19

Published Online: 2025-06-12

Published in Print: 2025-10-27

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Articles in the same Issue

https://doi.org/10.1515/freq-2024-0335

Keywords for this article

balanced BPF; dual-wideband BPF; intrinsic common-mode suppression; quad-mode slotline resonator