Acoustic Wave Resonator-Based Absorptive Bandstop Filters With Ultra-Narrow Bandwidth
Acoustic Wave Resonator-Based Absorptive Bandstop Filters With Ultra-Narrow Bandwidth
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DOI：
10.1109/lmwc.2015.2451357
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发表时间：
2015-07
影响因子：
3
通讯作者：
D. Psychogiou;Roberto Goamez-Garcia;D. Peroulis
中科院分区：
文献类型：
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作者：
D. Psychogiou;Roberto Goamez-Garcia;D. Peroulis
本文介绍了超窄带吸收带阻滤波器（ABSF）。它们基于混合RF设计方法，其中高无载品质因数（Q）声波（AW）谐振器和低Q集总元件元件有效地组合以创建窄分数带宽（FBW）阻带，其理论上表现出无限衰减和千阶有效品质因数（Qeff）。所提出的ABSF的设计方法进行了实验验证，在418 MHz，由市售的表面声波（SAW）谐振器和表面贴装器件（SMD）的两个制造的原型。测量的窄至0.02%的FBW对应于10，000的Qeff和68 dB的最大阻带隔离验证了所设想的ABSF设计概念。
Ultra-narrowband absorptive bandstop filters (ABSFs) are presented in this letter. They are based on a hybrid RF-design approach in which high-unloaded quality-factor (Q) acoustic wave (AW) resonators and low-Q lumped-element components are effectively combined to create narrow fractional-bandwidth (FBW) stopbands that exhibit theoretically infinite attenuation and effective quality factor (Qeff) of the order of a thousand. The proposed ABSF design approach is experimentally validated with two manufactured prototypes at 418 MHz that consist of commercially-available surface acoustic wave (SAW) resonators and surface mounted devices (SMDs). Measured FBWs as narrow as 0.02% that correspond to a Qeff of 10,000 and maximum stopband isolation of 68 dB validate the conceived ABSF design concept.