Filter apparatus
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United States of America Patent
Stats
-
Jul 30, 1991
Grant Date -
N/A
app pub date -
Mar 28, 1990
filing date -
Mar 30, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A filter apparatus comprised of a multi-layer printed circuit board has a shielded filter with input and output terminals protruding from the circuit board, when the filter is mounted on the printed circuit board. Two insulating substrates form the printed circuit board, and a connective conductive pattern is formed on an inner surface of one of the substrates that faces the other substrate. Conductive layers are formed on respective outer surfaces of the substrate opposing the connection conductive pattern, wherein at least one of the input and output terminals of the filter is connected to the connective conductive pattern and the conductive layers are grounded, thereby shielding the connective conductive pattern.
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