A dual mode filter with wideband suppression

作者：Xia, B^*; Mao, J

来源：Journal of Electromagnetic Waves and Applications, 2012, 26(11-12): 1470-1475.

DOI：10.1080/09205071.2012.703032

• Coupling coefficient
• Discriminating couplings
• Dual-mode bandpass filter
• Fundamental resonant frequencies
• Harmonic response
• Harmonic suppression
• High order harmonics
• Passband frequencies

This paper presents a novel method to suppress the harmonic responses of dual mode bandpass filters. The harmonic suppression is based on discriminating coupling. The coupling coefficient at fundamental resonant frequency can be tuned to desirable value whereas it is approaching to zero at high-order harmonic. The coupling region blocks the high-order harmonic but still allows the transmission of signals at passband frequency. Benefiting from this feature, the high order harmonic can be suppressed without degrading the passband performance. Furthermore, no additional circuit is needed. An example filter is implemented, and experimental results are presented to verify the proposed method.

• 出版日期2012
• 单位中国人民解放军镇江船艇学院; 上海交通大学