Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2005-04-05
2005-04-05
Tokar, Michael (Department: 2819)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C333S195000
Reexamination Certificate
active
06876275
ABSTRACT:
A surface acoustic wave device includes a plurality of interdigital electrode portions provided so as to have a balanced-unbalanced conversion function. A ratio N2/N1 is the range of about 50% to about 70%, where N1 represents the total number of electrode fingers of an interdigital electrode portion connected on a balanced signal terminal side, and N2 represents the total number of electrode fingers of the interdigital electrode portion connected on the unbalanced signal side, and the meshing width (W) of the interdigital electrode portions is in the range of about 43 λ to about 58 λ in which λ is the wavelength of a surface acoustic wave.
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Keating & Bennett LLP
Murata Manufacturing Co. Ltd.
Nguyen Linh V
Tokar Michael
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