Multiplexer, radio frequency front-end circuit, communication device, and multiplexer design method
AssigneeMurata Manufacturing Co., Ltd.
InventorsJunpei YASUDA, Morio TAKEUCHI
Life of this patent
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Abstract
A multiplexer includes a n number (n is an integer equal to three or more) of filters that are individually provided in the n number of paths commonly connected at a common junction point, and that have different pass bands from one another. In the multiplexer, (n−1) filters among the n number of filters except for the first filter have impedances of which imaginary components cancel each other at a pass band frequency of the first filter when viewed from the common junction point in a state of the n number of paths being not commonly connected.
Claims29
A multiplexer comprising:
- n number of filters that are individually provided in n number of paths commonly connected at a common junction point, and that have different pass bands from one another;
- wherein
- n is an integer equal to three or more;
- (n−1) filters among the n number of filters except for a first filter have impedances of which imaginary components cancel each other at a pass band frequency of the first filter when viewed from the common junction point in a state of the n number of paths being not commonly connected.
A method of designing a multiplexer including n number of filters that are individually provided in n number of paths commonly connected at a common junction point, and that have different pass bands from one another, where n is an integer equal to three or more, the method comprising:
- a first step of designing a first filter among the n number of filters;
- and
- a second step of designing (n−1) filters among the n number of filters except for the first filter;
- wherein
- in the second step, the (n−1) number of filters are designed such that imaginary components of impedances of the (n−1) number of filters cancel each other at a pass band frequency of the first filter when viewing a side including the n number of filters from a point, which is part of the n number of paths and which is to be the common junction point.
Dependencies are inferred from the claim text.