Dual mode resonator filter with improved feed-lines for
dual band applications

Shan Shan Gao – Jia Lin Li – Zhe Lin Zhu – Jia Li Xu – Yong Xin Zhao

   An improved feedline configuration for dual-mode resonator filter is investigated in this letter based on the introduced topology, a dual-mode dual-band bandpass filter with center frequencies of 1.8 and 2.4 GHz is optimally designed, fabricated and tested. The introduced dual-band bandpass filter has simple structure and enables high selectivity to be realized due to two pairs of transmission zeros located near to the lower and upper passband, respectively. Both measured and simulated performances are presented with good consistency.

Keywords: dual mode, dual band, bandpass, filter.

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