Title:
表面弾性波フィルタ
Document Type and Number:
Japanese Patent JP2010519813
Kind Code:
A
Abstract:
An electric filter has a band-pass filter that includes a track with acoustically coupled electroacoustic transducers. The filter includes a band-stop filter with at least one electroacoustic series element and at least one electroacoustic parallel element. The series element of the band-stop filter is connected in series to at least one of the transducers of the band-pass filter. The parallel element of the band-stop filter is arranged in a shunt arm that is electrically connected to at least one of the transducers of the band-pass filter. In at least one of the electroacoustic elements of the band-stop filter, the resonance frequency and the anti-resonance frequency lie outside the passband of the band-pass filter.
Inventors:
Kubat, Franz
Bower, thomas
Bower, thomas
Application Number:
JP2009549776A
Publication Date:
June 03, 2010
Filing Date:
February 15, 2008
Export Citation:
Assignee:
EPCOS AG
International Classes:
H03H9/64; H03H9/17; H03H9/54
Domestic Patent References:
| JP2001230657A | 2001-08-24 | |||
| JP2004048283A | 2004-02-12 | |||
| JPH07122970A | 1995-05-12 | |||
| JP2006074749A | 2006-03-16 | |||
| JPH07131290A | 1995-05-19 |
Foreign References:
| WO2007007476A1 | 2007-01-18 | |||
| WO2007006375A1 | 2007-01-18 |
Attorney, Agent or Firm:
Kimura Mitsuru
Takanori Mamoru
Taiji Morikawa
Johei Nakamura
Takanori Mamoru
Taiji Morikawa
Johei Nakamura