CPC H03H 9/0222 (2013.01) [H03H 7/075 (2013.01); H03H 7/38 (2013.01); H03H 7/46 (2013.01); H03H 9/6483 (2013.01); H03H 9/72 (2013.01)] | 18 Claims |
1. A composite filter device, comprising:
bandpass filters each including respective one ends and another ends; wherein
the one ends of the bandpass filters are electrically connected in common;
at least one of the bandpass filters includes a first filter electrically connected to the one end, a second filter electrically connected between the first filter and the another end, and a switch electrically connected between the first filter and the second filter; and
complex impedances of the first filter and the second filter have a same polarity in a pass band of another one of the bandpass filters different from the at least one of the bandpass filters when viewed from a same point in a circuit between the first filter and the second filter.
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