Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths
Compact Dual Band Bandpass Filter Using Novel E-Type Resonators With Controllable Bandwidths
复制标题
DOI：
10.1109/lmwc.2008.2007696
复制
发表时间：
2008-12
影响因子：
3
通讯作者：
Mingqi Zhou;Xiaohong Tang;F. Xiao
中科院分区：
文献类型：
--
作者：
Mingqi Zhou;Xiaohong Tang;F. Xiao
本文提出了一种采用新型E型谐振器的小型化微带双频带通滤波器。E型谐振器是一种短路短截线加载的发夹型谐振器，其两个通带频率可以通过调节发夹和短截线的特性阻抗和电长度来调节。通过组合伪叉指耦合结构，可以在较宽的范围内将两个频带的耦合系数调节到期望值。此外，引入钩形馈线，以获得两个频带的期望的外部耦合度。因此，可以实现可控的分数带宽（FBW）。设计了两个2阶2.45/5.25 GHz双频带通滤波器，其3 dB FBW分别为7%/7%和5%/5%。实测结果与仿真结果吻合较好。
A compact microstrip dual band bandpass filter (BPF) using novel E-type resonators is presented in this letter. The E-type resonator is a short-circuited stub loaded hairpin resonator, two passband frequencies of which can be regulated by adjusting the characteristic impedance and electrical length of the hairpin and the stub. By combining pseudo-interdigital coupling structure, the coupling coefficients of two bands can be adjusted to a desired value in a relatively wide range. In addition, hook feed line is introduced to obtain desired external coupling degrees for two bands. Thus, controllable fractional bandwidths (FBWs) can be achieved. Two two-order 2.45/5.25 GHz dual band BPFs with 3 dB FBW 7%/7% and 5%/5%, respectively, are designed. The measured result agrees well with the simulation.