Diplexers with low pass filter having distributed and non-distributed (lumped) elements
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United States of America Patent
Stats
-
Mar 29, 2005
Grant Date -
Oct 21, 2004
app pub date -
Apr 15, 2003
filing date -
Apr 15, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A low pass filter comprises a first series of transmission line elements connected between an input and an output; and a second series of shunt elements connected from the transmission line elements to a ground of the filter. At least one of the shunt elements has a distributed portion and a lumped portion. The distributed portion may comprise a tube mounted tangentially on a printed circuit board. The lumped portion may comprises a coil with a first lead connected to the first series of transmission line elements, and a second lead extending into the tube. A tuning element is moveably disposed in the tube. The tuning element may have an opening for receiving the second lead of the coil. The low pass filter may be used in a diplexer with one or more high pass filters. The diplexer may include power transmission apparatus.
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