Title :
Acoustic Wave Resonator-Based Absorptive Bandstop Filters With Ultra-Narrow Bandwidth
Author :
Psychogiou, Dimitra ; Goamez-Garcia, Roberto ; Peroulis, Dimitrios
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA
Abstract :
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.
Keywords :
Q-factor; band-stop filters; surface acoustic wave resonators; surface mount technology; ABSF design; FBW stopbands; Q lumped-element components; SAW resonators; SMD; absorptive bandstop filters; fractional-bandwidth stopbands; frequency 418 MHz; hybrid RF-design; quality-factor; surface acoustic wave resonators; surface mounted devices; ultranarrow bandwidth; Microwave filters; Prototypes; Resonant frequency; Surface acoustic waves; Transmission line matrix methods; Wireless communication; AW resonator; Absorptive bandstop filter (ABSF); acoustic wave (AW) filter; bandstop filter; high-quality-factor (Q) filter; narrowband filter;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2015.2451357
