Miniaturization of Broadband Stub Bandpass Filters Using Bridged-T Coils
Miniaturization of Broadband Stub Bandpass Filters Using Bridged-T Coils
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DOI：
10.1109/access.2018.2818938
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发表时间：
2018
期刊：
影响因子：
3.9
通讯作者：
Chia-Ching Huang;Wei-Ting Fang;Yo-Shen Lin
中科院分区：
文献类型：
--
作者：
Chia-Ching Huang;Wei-Ting Fang;Yo-Shen Lin
本文提出了一种电路尺寸非常紧凑的宽带短截线带通滤波器。具体地，通过用桥接T线圈替换所有传输线部分，大大减小了传统宽带短截线BPF的电路尺寸。此外，关于使用级联桥式T线圈的设计考虑进行了详细研究。所提出的宽带BPF设计仅基于集总元件，并且它们可以使用集成无源器件工艺来实现，以实现非常紧凑的电路尺寸。作为一个例子，给出了一个用于射电天文接收机混频器中频输出端的小型7阶宽带带通滤波器，其通带为4 ~ 12 GHz。带内插入损耗在2.46 ± 0.46 dB以内，电路尺寸仅为2.30 mm × 2.03 mm，解决了传统短截线带通滤波器电路尺寸大的问题。
In this paper, broadband stub bandpass filters (BPFs) with very compact circuit sizes are proposed. Specifically, the circuit size of the conventional broadband stub BPF is largely reduced by replacing all transmission line sections with bridged-T coils. In addition, the design consideration regarding the use of cascaded bridged-T coils is investigated in detail. The proposed broadband BPF designs are based on lumped elements only, and they can be implemented using the integrated passive device process to achieve very compact circuit sizes. As an example, a miniature 7th-order broadband BPF with a passband from 4 to 12 GHz, which is to be used at the mixer’s IF output of a radio astronomical receiver, is presented. The in-band insertion loss is within 2.46 ± 0.46 dB and the circuit size is only 2.30 mm $\times$ 2.03 mm. The long-lasting problem of large circuit size for conventional stub BPFs is thus solved.