A New and Simple Design Approach for Harmonic Suppression in Bandpass Filter
A New and Simple Design Approach for Harmonic Suppression in Bandpass Filter
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DOI：
10.1109/lmwc.2016.2646922
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发表时间：
2017-01
影响因子：
3
通讯作者：
Yunli Li;Jian‐Xin Chen;Q. Lu;W. Qin;Wenhua Li;Z. Bao
中科院分区：
文献类型：
--
作者：
Yunli Li;Jian‐Xin Chen;Q. Lu;W. Qin;Wenhua Li;Z. Bao
本文介绍了一种新的、简单的设计谐波抑制带通滤波器（BPF）的方法，该方法对单端和平衡带通滤波器都有效。根据平面传输线理论，四分之一波长谐振器在三次谐波处一定存在电压零点。选择该位置作为馈线的激励位置，使所设计的单端BPF的谐波不能被激发而被成功抑制，同时通过调谐谐振器的基频（$f_{0}$）可以优化BPF的通带并获得通带。该技术可以很容易地移植到平衡设计中，然后利用半波长谐振器可以有效地抑制平衡BPF的差模（DM）三次谐波。为了演示，设计和测量了两个设计实例，即单端和平衡bpf。给出了仿真和实验结果。
This letter introduces a new and simple approach for designing a harmonic-suppressed bandpass filter (BPF), which is effective for both single-ended and balanced BPFs. According to the planar transmission line theory, there must be a voltage-null point on the quarter-wavelength resonator at the third harmonic. It is chosen as the exciting location of the feeding line so that the harmonic of the designed single-end BPF cannot be excited and then is suppressed successfully, while the passband of the BPF operating at the fundamental resonant frequency ( $f_{0}$ ) of the resonator can be optimized and obtained by tuning other parameters. This technique can be easily transplanted to balanced design, and then the differential-mode (DM) third harmonic of the balanced BPF using the half-wavelength resonator can also be rejected effectively. For demonstration, two design examples, i.e. single-ended and balanced BPFs, are designed and measured. Their simulated and experiment results are presented.