Composite filter device
AssigneeMurata Manufacturing Co., Ltd.
InventorsJunpei Yasuda, Morio Takeuchi
Life of this patent
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Abstract
A composite filter device includes bandpass filters whose respective one ends are electrically connected in common. A first bandpass filter of the bandpass filters includes a first filter, a switch, a second filter, and an impedance element that is electrically connected to the switch and having an impedance value larger than the input impedance value of the second filter. The switch is configured to be switched between a first state in which the first filter and the second filter are electrically connected and a second state in which the first filter and the impedance element are electrically connected.
Claims20
A composite filter device, comprising:
- bandpass filters having different pass bands;
- wherein
- each of the bandpass filters includes one end and another end;
- the one ends of the bandpass filters are electrically connected in common;
- at least one of the bandpass filters includes a switch electrically connected between the one end and the another end, a first bandpass filter electrically connected between the one end and the switch, a second bandpass filter electrically connected between the switch and the another end, and an impedance element electrically connected to the switch and having an impedance value larger than an input impedance value of the second bandpass filter;
- and
- the switch is configured to be switched between a first state in which the first bandpass filter and the second bandpass filter are electrically connected and a second state in which the first bandpass filter and the impedance element are electrically connected.
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 bandpass filter electrically connected to the one end, a second bandpass filter electrically connected between the first bandpass filter and the another end, and a switch electrically connected between the first bandpass filter and the second bandpass filter;
- and
- complex impedances of the first bandpass filter and the second bandpass 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 bandpass filter and the second bandpass filter.
Dependencies are inferred from the claim text.