A Novel Compact Tri-band Bandpass Filter with Good Selectivity
A novel tri-band bandpass filter(BPF)based on multi-mode resonators is presented.The resonant modes of the resonators can be analyzed by the even-and odd-mode analysis method.The bandwidths of first and second passbands can be independently controlled.Furthermore,five transmission zeros(TZ)are introduced at the adjacent of the passbands in a narrow frequency range to improve the selectivity,resulting sharp skirts.Due to the small multi-mode resonator and tight coupling structure,the overall size of the proposed filter is really compact(0:19λ0×0:18λ0).λ0 is the wavelength of the center frequency of first passband in the substrate.Finally,a prototype to demonstrate the performance of the filter is designed and fabricated.The measured 3-dB fractional bandwidths for the three passbands(2.22,2.98 and 3.5 GHz)are found to be 8.4%,2.7%and 6.1%,respectively.The measurement shows good agreement with the simulation.
D.-H.Jia Q.-Y.Feng X.-G.Huang Q.-Y.Xiang
School of Information Science and Technology Southwest Jiaotong University,Chengdu,Sichuan 610031,China
国际会议
Progress in Electromagnetics Research Symposium 2014(2014年电磁学研究新进展学术研讨会)
广州
英文
577-581
2014-08-01（万方平台首次上网日期，不代表论文的发表时间）