학술논문
Solidly mounted bulk acoustic wave filters for the GHz frequency range
Document Type
Conference
Author
Source
2002 IEEE Ultrasonics Symposium, 2002. Proceedings. Ultrasonics symposium Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE. 1:919-923 vol.1 2002
Subject
Language
ISSN
1051-0117
Abstract
Small sized, highly selective solidly mounted bulk acoustic wave (BAW) band pass filters are suitable for mobile and wireless systems operating in the frequency range 0.8 and 10 GHz. Both lattice and ladder BAW resonator filters have been designed and fabricated on 6" wafers using multilayer Bragg type acoustic reflectors. For the piezoelectric film highly oriented AlN has been deposited using an optimised sputter process. Resonators and filters were made and measured both on glass and silicon wafers. Resonators on glass and Si show different substrate loss. Dielectric loss in the AlN piezo-layer is small. The acoustic loss is found to be small in all the materials. The properties of the acoustic reflector can be monitored by a thorough examination of small details of the resonator's frequency response. Resonator and filter examples are shown for 2 GHz, 2.8 GHz, and 8 GHz.