Synthesis Design of Wideband Differential Bandpass Filter With Intrinsic CM Noise Rejection Using Branch-Line Configuration
Synthesis Design of Wideband Differential Bandpass Filter With Intrinsic CM Noise Rejection Using Branch-Line Configuration
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DOI：
10.23919/apmc55665.2022.9999904
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
Pin Wen;Zhewang Ma;Shuangshuang Zhu;Fan Liu;M. Ohira
中科院分区：
文献类型：
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作者：
Pin Wen;Zhewang Ma;Shuangshuang Zhu;Fan Liu;M. Ohira
提出了一种新型宽带等纹波差分带通滤波器（DBPF）。该宽带DBPF由3条横向微带线和4条支路结构构成，其差模（DM）等效电路具有带通特性，而共模（CM）等效电路具有带阻性能。因此，所提出的宽带DBPF具有固有的CM噪声抑制特性。此外，引入平行耦合线（PCL）结构，在DM通带的上下两端产生额外的传输零点，以提高选择性。为了演示，设计了一个4ghz的宽带原型。模拟结果与综合结果吻合较好。
In this paper, a novel wideband equal-ripple differential bandpass filter (DBPF) is proposed. The wideband DBPF is constructed by three transverse microstrip lines and four branch-line structures, and its differential mode (DM) equivalent circuit is a bandpass characteristic, while the common mode (CM) equivalent circuit shows a bandstop performance. Therefore, the proposed wideband DBPF has intrinsic CM noise rejection feature. Moreover, parallel coupled-line (PCL) structure was introduced to create additional transmission zeros at the lower and upper DM passband to enhance the selectivity. For demonstration, a wideband prototype is designed at 4 GHz. The simulated results agree well with those obtained through synthesis.