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US 2019/0103855 A1Published application
Switch module
AssigneeMurata Manufacturing Co., Ltd.
InventorsTakayuki TOMITA, Daisuke WATANABE
Life of this patent
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Abstract
A switch module includes a first terminal, first and second filters, and first and second switches. Impedance of the first filter for a signal in a stop band is capacitive. When the first switch is turned OFF, impedance of the first switch is capacitive, and impedance of the first filter seen from an end portion of the first switch connected to the first filter is not in a short state and impedance of the first filter seen from the first terminal is in an open state.
Claims16
A switch module comprising:
- a first terminal;
- a first filter that allows a signal in a first frequency band to pass through the first filter and stops a signal in a second frequency band from passing through the first filter;
- a first switch that controls an electrical connection between the first terminal and the first filter, the first terminal and the first filter being connected when the first switch is ON and the first terminal and the first filter being disconnected when the first switch is OFF;
- and
- a sixth switch that controls an electrical connection between ground and a third node between the first switch and the first filter, the third node being connected to ground when the sixth switch is ON and the third node being disconnected from ground when the sixth switch is OFF, wherein:
- the sixth switch is OFF regardless of whether the first switch is ON or OFF,
- the first filter has a capacitive impedance for a signal in the second frequency band.
4 more elements
A switch module comprising:
- a first terminal;
- a first filter that allows a signal in a first frequency band to pass through the first filter and stops a signal in a second frequency band from passing through the first filter;
- a first switch that controls an electrical connection between the first terminal and the first filter, the first terminal and the first filter being connected when the first switch is ON and the first terminal and the first filter being disconnected when the first switch is OFF;
- a second terminal;
- and
- a seventh switch that controls an electrical connection between the second terminal and the first filter, the second terminal and the first filter being connected when the seventh switch is ON and the second terminal and the first filter being disconnected when the seventh switch is OFF, wherein
- the first filter is connected between the first switch and the seventh switch, and
- when the seventh switch is OFF:
- the seventh switch has a capacitive impedance,
- an impedance of the first filter as seen from the seventh switch is not shorted, and
- an impedance of the first filter as seen from the second terminal is open.
8 more elements
Dependencies are inferred from the claim text.