High Selectivity Wideband Superconducting Filter Design Based on Feed Line Resonator (FLR) Method

0 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE microwave and wireless technology letters Pub Date : 2024-07-24 DOI:10.1109/LMWT.2024.3415074

Xilong Lu;Xueyang Fang;Guangsong Wei;Shigang Zhou;Li Sun;Xudong Bai;Bokai Weng;Yanhong Gao;Dongbo Chen

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Abstract

This letter presents the new concept and method of feed line resonator (FLR). Unlike the conventional filter feed lines, which serve solely for external coupling, the proposed feed line resonators can not only introduce additional transmission poles within the passband, but also generate transmission zeros at both sides of the passband, thereby significantly augmenting the filter’s performance without enlarging its physical dimensions. A novel and systematic method for constructing multimode resonators, called the connected line resonator (CLR) method has been proposed, two parallel lines are connected to obtain three resonant modes for filter design. The key advantage of this proposed CLR is its ability to exhibit a substantial attenuation slope at the higher band edge. To demonstrate the FLR and CLR method, two wideband filters were designed based on the high-temperature superconducting film, with the center frequency at 7.3 GHz, and the fractional bandwidth of about 59%. The measured results agree well with the simulation ones.

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基于馈线谐振器 (FLR) 方法的高选择性宽带超导滤波器设计

本文介绍了馈线谐振器（FLR）的新概念和新方法。与仅用于外部耦合的传统滤波器馈电线不同，所提出的馈电线谐振器不仅能在通带内引入额外的传输极点，还能在通带两侧产生传输零点，从而在不扩大物理尺寸的情况下显著提高滤波器的性能。有人提出了一种新颖、系统的多模谐振器构造方法，即连接线谐振器（CLR）方法，通过连接两条平行线来获得三个谐振模式，从而实现滤波器的设计。这种连接线谐振器的主要优点是能在较高的频带边缘表现出很大的衰减斜率。为了演示 FLR 和 CLR 方法，我们设计了两个基于高温超导薄膜的宽带滤波器，其中心频率为 7.3 GHz，分数带宽约为 59%。测量结果与模拟结果非常吻合。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE microwave and wireless technology letters

CiteScore

6.00

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0.00%

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