A Self-Packaged Tunable LC Fourth-Order Filter With Cross-Coupling and Bandwidth Compensation

0 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE microwave and wireless technology letters Pub Date : 2025-02-04 DOI:10.1109/LMWT.2025.3535706

Longchuan Liu;Qianyin Xiang;Quanyuan Feng

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Abstract

This letter presents a cross-coupled lumped LC tunable bandpass filter (BPF) based on novel LC electric coupling circuits and magnetic dominant mixed coupling circuits. The design enables control over the slope and magnitude of the electric and magnetic coupling coefficients to compensate the bandwidth. The magnetic dominant mixed coupling, serving as cross-coupling, generates a pair of adaptive transmission zeros (TZs) on either side of the passband and an additional mixed coupling TZ at low frequency. To validate this concept, two tunable LC filters—Filter I, based on low-cost FR4 substrate-integrated suspended line (SISL), and Filter II, based on low loss microwave substrate-integrated microstrip, are designed and fabricated. Both filters showcase a wide tuning range and compact size. The SISL filter is with a tuning range of 0.36–0.77 GHz and a size of

$0.09\lambda _{\mathbf {g}} \times 0.04\lambda _{\mathbf {g}}$

, which stands out for its self-packaging capabilities and cost-effectiveness.

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具有交叉耦合和带宽补偿的自封装可调谐LC四阶滤波器

本文提出了一种基于新型LC电耦合电路和磁主导混合耦合电路的交叉耦合集总LC可调谐带通滤波器。该设计可以控制电磁耦合系数的斜率和幅度，以补偿带宽。磁主导混合耦合作为交叉耦合，在通带两侧产生一对自适应传输零点（TZs），并在低频处产生额外的混合耦合TZ。为了验证这一概念，设计并制造了两个可调谐LC滤波器——基于低成本FR4衬底集成悬吊线（SISL）的滤波器I和基于低损耗微波衬底集成微带的滤波器II。这两个过滤器展示了广泛的调谐范围和紧凑的尺寸。SISL滤波器的调谐范围为0.36-0.77 GHz，尺寸为$0.09\lambda _{\mathbf {g}} \乘以$ 0.04\lambda _{\mathbf {g}}$，以其自封装能力和成本效益脱颖而出。

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

自引率

0.00%

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