Wave transmission lines and networks – Plural channel systems – Having branched circuits
Reexamination Certificate
2007-12-18
2007-12-18
Summons, Barbara (Department: 2817)
Wave transmission lines and networks
Plural channel systems
Having branched circuits
C333S186000, C333S193000
Reexamination Certificate
active
11538532
ABSTRACT:
A boundary acoustic wave filter includes a first medium layer, a second medium layer laminated on the first medium layer, and IDT electrodes that are disposed at the boundary between the first and second medium layers and that define an electroacoustic transducer. In the boundary acoustic wave filter, the sound velocity of boundary acoustic waves, which is the product of the wavelength determined by the period of the electrodes and the frequency at least the lower end of the stopband disposed at the high-frequency side of the passband, is less than the sound velocity of slow transverse waves propagating through the first medium layer and the second medium layer.
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Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Summons Barbara
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