H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/15
H05K 1/11 (2006.01) H03H 9/145 (2006.01) H05K 1/02 (2006.01) H05K 1/16 (2006.01) H05K 9/00 (2006.01) H05K 3/34 (2006.01)
Patent
CA 1088211
ABSTRACT OF THE DISCLOSURE An acoustic surface wave filter element provided with two input and two output pins connected with input and the out- put interdigital electrodes, respectively, and an earth pin connected with a filter element shield casing is disposed on one surface of a circuit board, with the five pins extending through corresponding through holes in the circuit board to the other surface of the circuit board on which the pins are connec- ted with corresponding conductive circuit patterns of the cir- cuit board. The circuit patterns include a first signal pattern connected with one of the input pins, a first earth pattern connected with the other of the input pins, a second and a third signal pattern connected with one and another of the output pins respectively, and a second earth pattern connected with the earth of the filter element. In order to reduce stray capaci- tance and to equalize mutual inductance between the first and the second and third signal patterns respectively, the first and the second signal patterns have end portions opposedly positioned to each other, and an earth pattern portion is posi- tioned between the opposed end portions of the first and the second signal pattern to connect the first and the second earth pattern with each other. Portions of the patterns positioned beneath the filter element are arrayed symmetrically about an axis passing through the end portion of the first signal pat- tern and extending between the second and third signal patterns.
299242
Ridout & Maybee Llp
Tokyo Shibaura Electric Co. Ltd.
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