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Multi-harmonic Suppression Band-Pass Filter for Communication System
Wenmei Zhang,Liping Han,Runbo Ma,Junfa Mao 한국전자통신연구원 2007 ETRI Journal Vol.29 No.4
For the purpose of decreasing intermodulation distortion, a new multi-harmonic suppression band-pass filter based on a microstrip radial stub is studied. Compared with traditional resonator filters, the new filter can suppress the second, third, and even fourth harmonics directly. The dimension of the filter is about 0.3 λg0×0.13 λg0 (λg0 is the guiding wavelength at the resonant frequency). Only one gap was introduced, so lower insertion loss can be obtained. Basic agreement between the measured and simulated results has been achieved.
A Co-design Study of Filters and Oscillator for Low Phase Noise and High Harmonic Rejection
Bing Zhang,Wenmei Zhang,Runbo Ma,Xiaowei Zhang,Junfa Mao 한국전자통신연구원 2008 ETRI Journal Vol.30 No.2
In this paper, we present a novel oscillator (OSC) design. Bandpass filters, which can suppress harmonics, are incorporated into a co-design with an OSC to improve the OSC phase noise and harmonic rejection. The proposed OSC/bandpass filter co-design achieves a phase noise of - 130.1 dBc/Hz/600 kHz and harmonic rejection of 37.94 dB and 40.85 dB for the second and third harmonics, respectively, as compared to results achieved by the OSC before co-design of - 101.6 dBc/Hz/600 kHz and 21.28 dB and 19.68 dB. Good agreement between the measured and simulated results is achieved.