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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2018-11-12
Reflectionless High-Selective Bandpass Filter Based on Acoustic Wave Resonators
By
Jordi Verdú Tirado,

    Dr. Jordi Verdú Tirado

    Telecommunications and Systems Engineering

    Universitat Autonoma de Barcelona

    Spain

    Homepage

Daniel Ulinic,

    Dr. Daniel Ulinic

    Telecommunications and Systems Engineering Department

    Universitat Autonoma de Barcelona (UAB)

    Spain

    Homepage

Pedro de Paco

    Dr. Pedro de Paco

    Telecommunication and System Engineering Department

    Universitat Autônoma de Barcelona

    Spain

    Homepage

Progress In Electromagnetics Research Letters, Vol. 80, 15-22, 2018
doi:10.2528/PIERL18072407 | Google Scholar

Abstract
Reflective filters are characterized by a frequency response with good matching at the band of interest and usually reactive impedance out of those frequencies which may adversely affect the system performance. On the other hand, reflectionless filters are characterized by good matching characteristic not only at the interest frequencies, but in the whole frequency spectrum which improves the overall linearity, efficiency, and reduces instability scenarios at the system level. Although several reflectionless structures can be found in the literature, the concatenation of different reflectionless sections, combined with the use of acoustic resonators has not been exploited yet. The particular electrical behavior of acoustic wave resonators, where two different resonant frequencies are found, allow to obtain a frequency response with high selectivity due to the presence of transmission zeros below and above the passband. A bandpass filter has been designed following the described procedure with a fractional bandwidth FBW = 2%, a pair of transmission zeros below and above the bandpass, and an improved out-of-band rejection with respect conventional topologies.
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Citation
Jordi Verdú Tirado, Daniel Ulinic, and Pedro de Paco, "Reflectionless High-Selective Bandpass Filter Based on Acoustic Wave Resonators," Progress In Electromagnetics Research Letters, Vol. 80, 15-22, 2018.
doi:10.2528/PIERL18072407
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