Surface acoustic wave filter

Details Surface acoustic wave filter Surface acoustic wave filter

2007-02-27

2007-02-27

Summons, Barbara (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S193000

Reexamination Certificate

active

10526919

ABSTRACT:
A surface acoustic wave filter having a plurality of the transmission lines, each with one end connected to the surface acoustic wave element and the other end thereof connected to a ground. The transmission lines are divided by an additional transmission line which has multiple connections to a ground electrode at an interval equal to or lower than a wavelength of a using frequency. This structure provides grounds among a plurality of transmission lines and thus isolation among terminals can be increased to improve the filter characteristic.

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G. Ponchak et al., The Use of Metal Filled Via Holes for Improving Isolation in LTCC RF and Wireless Multichip Packages, IEEE Transactions on Advanced Packaging, vol. 23, No. 1, Feb. 2000, pp. 88-99.

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