NDLI: Characteristics of the unique modes in HBARs

Content Provider	IEEE Xplore Digital Library
Author	Shih-Yung Pao Zuoqing Wang Zi-Neng Huang Min-Chiang Chao Lam, C.S. Pei-Zen Chang
Copyright Year	2003
Description	Author affiliation: Inst. of Appl. Mech., Nat. Taiwan Univ., Taipei, Taiwan (Shih-Yung Pao)
Abstract	Simulation results for three kinds of HBARs with different piezo-film and substrate combinations are presented. Based on the distributions of the resonance frequency spacing and the effective coupling factor k/sub eff//sup 2/(m) , which significantly rely on the acoustic impedance ratio of the piezo-film to substrate, a unique mode with maximum k/sub eff//sup 2/(m) can be chosen. For the unique mode of the HBARs, the variations of the Q-value of the series resonance frequency, Q/sub s/, the effective coupling factor k/sub eff//sup 2/(m), the motional resistance R/sub 1/, the capacitance ratio r=C/sub 0//C/sub 1/, the F.O.M.=Q/sub s/C/sub 1//2C/sub 0/, and Q/sub s//spl middot/k/sub eff//sup 2/(m), with the thickness of the substrate are calculated. Those data give some guidelines to choose the thickness of the substrate for compromising the parameters of the operating mode. Results showed that it is unnecessary to choose very thick substrate for obtaining high Q. Actually, high Q can be obtained when the thickness ratio to the film reaches about 50 to 150 for the three different kinds of samples.
Sponsorship	IEEE Ultrasonics, Ferroelectrics, and Frequency Control Soc. Piezoelectric Devises Association
Starting Page	785
Ending Page	793
File Size	280647
Page Count	9
File Format	PDF
ISBN	0780376889
ISSN	10756787
DOI	10.1109/FREQ.2003.1275192
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-04
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Substrates Resonance Resonant frequency Oscillators Capacitance Frequency control Chaos Cities and towns Impedance Guidelines
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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