Title: Acoustic resonator and filter
Application Number: 200510056227 Application Date: 2005.03.30
Publication Number: 1677842 Publication Date: 2005.10.05
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H03B5/30
Applicant(s) Name: Matsushita Electric Ind Co., Ltd. Address:
Inventor(s) Name: Nakatsuka Hiroshi, Onishi Keiji, Nakamura Hiroyuki
Attorney & Agent: qian weimin
Abstract:
     The area of an opening C of a cavity 31 is equal to or greater than the area of a horizontal cross section D of a vibrating section 10. The vibrating section 10 is placed on a support section 20 at a position such that a vertical projection of the vibrating section 10 onto a substrate 30 is accommodated within the opening C of the cavity 31. Moreover, the sum of a vertical thickness t1 of the vibrating section 10 and a vertical thickness t2 of the support section 20 is equal to one wavelength of a resonance frequency fr of the acoustic resonator 1 (one wavelength=t1 t2), while the thickness t1 of the vibrating section 10 and the thickness t2 of the support section 20 are different from each other (t1<>t2). Thus, neither the thickness t1 of the vibrating section 10 nor the thickness t2 of the support section 20 is equal to the half wavelength of the resonance frequency fr.
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