Compact Multi-Band Bandpass Filters With Mixed Electric and Magnetic Coupling Using Multiple-Mode Resonator

Compact Multi-Band Bandpass Filters With Mixed Electric and Magnetic Coupling Using Multiple-Mode Resonator
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使用多模谐振器具有混合电磁耦合的紧凑型多频带带通滤波器

DOI:
10.1109/tmtt.2015.2488643
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发表时间:
2015-10
影响因子:
4.3
通讯作者:
Wei Gao
Wei Gao
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu Jin;Wu Wen;Wei Gao

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提出了一种多短截线加载环形谐振器(MSLRR),用于设计直接耦合的电磁混合耦合多带通滤波器(BPF)。建议MSLRR表现出多模谐振行为。增加的负载短截线的数量激发了更多有用的谐振模式,但是这些谐振模式仍然可以被独立地控制。作为示例,设计并制造了使用不同类型的MSLRR的双频带通滤波器、三频带通滤波器、四频带通滤波器和五频带通滤波器。这些多频带BPF的通带频率和回波损耗(RL)可以被独立地控制。然后在五带通滤波器中引入一个双模开环谐振器,以增强MSLRR的第六谐振模式,从而产生第六通带,从而也提出了一个六带通滤波器。由于MEMC和MSLRR中的虚地的抵消效应,可以在通带周围观察到多个传输零点,从而导致尖锐的通带选择性和高的带间隔离。此外,所有制作的多频带带通滤波器具有紧凑的尺寸,良好的RL,和低插入损耗。模拟结果与实测结果吻合较好。
In this paper, a multiple stubs loaded ring resonator (MSLRR) is proposed to design directly coupled multi-band bandpass filters (BPFs) with mixed electric and magnetic coupling (MEMC). The proposed MSLRR exhibits multiple-mode resonant behavior. The increased number of loaded stubs excite many more useful resonant modes, but these resonant modes can be still independently controlled. As examples, a dual-band BPF, a tri-band BPF, a quad-band BPF, and a quint-band BPF using different types of MSLRRs are designed and fabricated. The passband frequencies and return losses (RLs) of these multi-band BPFs can be independently controlled. A dual-mode open loop resonator is then introduced in the quint-band BPF to enhance the sixth resonant mode of the MSLRR to produce the sixth passband so that a sext-band BPF is also presented. Multiple transmission zeros due to the cancelling effect of MEMC and virtual grounds in the MSLRR can be observed around the passbands resulting in sharp passband selectivity and high band-to-band isolation. Moreover, all of the fabricated multi-band BPFs have compact sizes, good RLs, and low insertion losses. Good agreements are observed between the simulated and measured results.
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