Loaded series resonators for adjusting frequency response of acoustic wave resonators

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United States of America Patent

PATENT NO 11894827
APP PUB NO 20210359659A1
SERIAL NO

17379304

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Abstract

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An acoustic wave filter device is disclosed. The device includes an acoustic wave filter element, and a first resonator and a second resonator coupled to the acoustic wave filter element. The acoustic wave filter element includes interdigited input electrodes and output electrodes located on a top surface of a piezoelectric layer. Each of the first and the second resonators includes a top electrode on the top surface, and a bottom electrode on the bottom surface of the piezoelectric layer. At least one of each of the first and the second resonators' electrodes is electrically connected to the acoustic wave filter element. The first resonator has a first notch in resonator impedance at a first frequency. The second resonator includes a first mass loading layer on the second resonator electrode such that the second resonator has a second notch in resonator impedance at a second frequency different from the first frequency.

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Patent Owner(s)

Patent OwnerAddress
VTT TECHNICAL RESEARCH CENTRE OF FINLAND LTDTEKNIIKANTIE 21 ESPOO 02150

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Dekker, James Espoo, FI 14 99
Makkonen, Tapani Espoo, FI 14 33
Pensala, Tuomas Espoo, FI 34 736
Ylilammi, Markku Espoo, FI 19 301

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