Investigations of a New Design Concept for Wide-Band Hybrid Ladder Filters

Titelangaben

Wagner, Michael ; Grossmann, Timo ; Tomasik, Jakob ; Weigel, Robert ; Hagelauer, Amelie:
Investigations of a New Design Concept for Wide-Band Hybrid Ladder Filters.
In: 2019 IEEE International Ultrasonics Symposium (IUS). - Piscataway, NJ : IEEE , 2019 . - S. 2564-2567
ISBN 978-1-7281-4596-9
DOI: https://doi.org/10.1109/ULTSYM.2019.8925929

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Abstract

In this paper, a new design concept for wide-band hybrid ladder filters is investigated. The concept enables manipulation of the fixed behavior and limited electromechanical coupling coefficient (k eff 2 ) of acoustic-wave resonators by additional lumped-element resonators. This hybrid approach allows for resonance spreading of single acoustic-wave resonators, which corresponds to an increased k eff 2 . An illustration of the concept is given, as well as an example for the application to wide-band filter design. Measurements of one of two proposed basic structures show an effective increase of k eff 2 by a factor of more than 4, demonstrating that the concept is feasible in practice.