A New and Simple Design Approach for Harmonic Suppression in Bandpass Filter

作者：Li, Yun-Li; Chen, Jian-Xin; Lu, Qing-Yuan; Qin, Wei; Li, Wenhua; Bao, Zhi-Hua^*

来源：IEEE Microwave and Wireless Components Letters, 2017, 27(2): 126-128.

DOI：10.1109/LMWC.2016.2646922

• Balanced
• bandpass filter (BPF)
• harmonic suppression
• single-ended
• uniform-impedance resonator (UIR)

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 voltagenull 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.

• 出版日期2017-2
• 单位南通大学