Surface acoustic wave duplexer and communication apparatus
First Claim
1. A surface acoustic wave duplexer comprising:
- a multi-layer substrate including a plurality of layers;
a branching section provided on said substrate, said branching section including a plurality of surface acoustic wave filters arranged to perform a branching function for transmission and reception;
an antenna terminal, a transmission terminal, a receiving terminal, and a ground terminal each connected to the branching section and provided at a peripheral portion of the substrate; and
a stripline having a matching function being provided on a single layer of the plurality of layers such that one end thereof is connected to the antenna terminal and the other end thereof is connected to a ground terminal disposed on at least one side other than a side opposite to a side where the antenna terminal is located.
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Accused Products
Abstract
A surface acoustic wave duplexer includes a branching section having a plurality of surface acoustic wave filters provided on a first electrode pattern on the front surface of a multi-layer substrate. An antenna terminal, a transmission terminal, and a receiving terminal are provided on peripheral portions of a fourth electrode pattern on the rear surface of the multi-layer substrate, and are connected to the branching section. A matching stripline disposed on a third electrode pattern in an intermediate layer of the multi-layer substrate, and connected to the antenna terminal is arranged such that it is grounded to at least one side other than the side opposite the side where the antenna terminal is located.
27 Citations
14 Claims
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1. A surface acoustic wave duplexer comprising:
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a multi-layer substrate including a plurality of layers;
a branching section provided on said substrate, said branching section including a plurality of surface acoustic wave filters arranged to perform a branching function for transmission and reception;
an antenna terminal, a transmission terminal, a receiving terminal, and a ground terminal each connected to the branching section and provided at a peripheral portion of the substrate; and
a stripline having a matching function being provided on a single layer of the plurality of layers such that one end thereof is connected to the antenna terminal and the other end thereof is connected to a ground terminal disposed on at least one side other than a side opposite to a side where the antenna terminal is located. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification