Duplexer and communication apparatus with a matching circuit including a trap circuit for harmonic suppression
First Claim
Patent Images
1. A duplexer comprising:
- a transmitting filter and a receiving filter which are connected in parallel to an antenna terminal; and
a matching circuit provided between the antenna terminal and at least one of the transmitting filter and the receiving filter;
whereina portion of the matching circuit defines a trap circuit for harmonic suppression;
the trap circuit includes at least one open stub corresponding to a harmonic to be suppressed;
the matching circuit includes a parallel inductor connected between the antenna terminal and a ground; and
the parallel inductor is a wound-type chip coil.
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Accused Products
Abstract
A duplexer includes a transmitting filter and a receiving filter which are connected in parallel to an antenna terminal, and a matching circuit connected between the antenna terminal and at least one of the transmitting filter and the receiving filter. A portion of the matching circuit defines a trap circuit for harmonic suppression.
23 Citations
18 Claims
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1. A duplexer comprising:
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a transmitting filter and a receiving filter which are connected in parallel to an antenna terminal; and a matching circuit provided between the antenna terminal and at least one of the transmitting filter and the receiving filter;
whereina portion of the matching circuit defines a trap circuit for harmonic suppression; the trap circuit includes at least one open stub corresponding to a harmonic to be suppressed; the matching circuit includes a parallel inductor connected between the antenna terminal and a ground; and the parallel inductor is a wound-type chip coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A duplexer comprising:
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a transmitting filter and a receiving filter which are connected in parallel to an antenna terminal; and a matching circuit provided between the antenna terminal and at least one of the transmitting filter and the receiving filter, at least one package for housing at least one of the transmitting filter and the receiving filter; and a multi-layer substrate having the package and a portion of the matching circuit mounted thereon;
whereina portion of the matching circuit defines a trap circuit for harmonic suppression; the matching circuit includes a parallel inductor connected between the antenna terminal and a ground; and the parallel inductor of the matching circuit includes a chip coil. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification