Novel Varactor-Tuned Balanced Bandpass Filter with Continuously High Common-Mode Suppression

Qing-Yuan Lu; Jian-Xin Chen; Li-Heng Zhou; Hui Tang

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Novel Varactor-Tuned Balanced Bandpass Filter with Continuously High Common-Mode Suppression

机译：具有连续高共模抑制能力的新型变容调谐平衡带通滤波器

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摘要

In this letter, a novel balanced varactor-tuned bandpass filter (BPF) designed by using the half-wavelength microstrip resonators is proposed. The frequency-tuning mechanism of the resonator is analytically investigated for designing the proposed balanced BPF. By adding a tunable capacitor to the center of the resonator, it is noted that the common mode can be suppressed to a great extent in the frequency-tuning range of the differential-mode passband. Also, it has no effect on the differential-mode response. For demonstration, a balanced BPF is designed and fabricated. The simulated and measured results with good agreement show that the center frequency of the differential-mode passband can be tuned from 0.725 GHz to 0.811 GHz, while the common-mode suppression in this frequency range is always more than 25 dB.

机译：在这封信中，提出了一种使用半波长微带谐振器设计的新型平衡变容二极管调谐带通滤波器（BPF）。为了设计提出的平衡BPF，对谐振器的频率调谐机制进行了分析研究。通过在谐振器的中心增加可调电容器，可以注意到，在差模通带的频率调谐范围内，可以在很大程度上抑制共模。而且，它对差模响应没有影响。为了演示，设计并制造了平衡的BPF。仿真和测量结果吻合良好，表明差模通带的中心频率可以从0.725 GHz调谐到0.811 GHz，而在该频率范围内的共模抑制总是大于25 dB。

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来源
《Applied Computational Electromagnetics Society journal》 |2013年第7期|628-632|共5页
作者
Qing-Yuan Lu; Jian-Xin Chen; Li-Heng Zhou; Hui Tang;
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作者单位

School of Electronics and Information Nantong University, Nantong, 226019, China;

School of Electronics and Information Nantong University, Nantong, 226019, China;

School of Electronics and Information Nantong University, Nantong, 226019, China;

School of Electronics and Information Nantong University, Nantong, 226019, China;

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正文语种 eng
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关键词
Balanced bandpass filter (BPF); common-mode suppression; half-wavelength resonator, and tunable filter;

机译：平衡带通滤波器（BPF）;共模抑制半波长谐振器和可调滤波器;

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Novel Varactor-Tuned Balanced Bandpass Filter with Continuously High Common-Mode Suppression

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