Design of a compact narrow band-pass filter with harmonics suppression

作者：Zhao Jian Zhong^*; Yang Jin Ping; Yang Guo; Wu Wen

来源：Journal of Xidian University, 2009, 36(3): 568-572.

• Design process
• Even
• and odd-mode
• Even
• and odd-more analysis
• Harmonic suppression
• Harmonics suppression
• Low insertion loss
• Measured results
• Narrow-band pass filters
• Parallel coupled line
• Pass bands
• Passband characteristics
• Second and third harmonics
• Stopband attenuation
• Through transmission
• Transmission line models

A compact narrow band-pass filter with a low insertion loss and multi-order harmonics suppression is proposed. The harmonic suppression is realized through transmission zeros of the parallel coupled lines loaded open-circuited resonator, and the filter passband characteristics are determined by the short-circuited stubs. By coupling of the transmission line model of this filter and even- and odd-mode analysis, the expressions for calculating element parameters are presented, and thus the design process in this paper is fast and accurate. Finally, a band-pass filter working in 2.4 GHz is developed. Simulation and measured results show that the passband insert-loss is 0.4 dB, that stopband attenuations at second and third harmonics frequency are more than 35 dB, and that stopband attenuations at fourth is about 20 dB.

• 出版日期2009
• 单位南京大学