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Multiplexer, transmission apparatus, and reception apparatus

  • US 10,476,532 B2
  • Filed: 01/29/2018
  • Issued: 11/12/2019
  • Est. Priority Date: 02/24/2016
  • Status: Active Grant
First Claim
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1. A multiplexer which transmits and receives high-frequency signals in a plurality of frequency bands via an antenna element, the multiplexer comprising:

  • a common terminal connected to an impedance matching element at a connection path connected to the antenna element;

    a plurality of filter elements including different pass bands and connected to the antenna element with the common terminal therebetween;

    an inductance element arranged in series between a first filter element with a largest capacitance when viewed from a side of the antenna element among the plurality of filter elements and the common terminal; and

    a circuit element arranged in series or in parallel between the inductance element and the first filter element with the largest capacitance;

    whereinwhen the circuit element is arranged in parallel between the inductance element and the first filter element, the circuit element is connected to a reference terminal on a first side and to a connection point of the inductance element and the first filter element on a second side;

    the inductance element is a first inductance element;

    the circuit element includes a second inductance element or a capacitance element;

    an inductive component of the inductance element, a capacitive component of the first filter element, and an inductive component or a capacitive component of the circuit element define an LC series resonant circuit; and

    a resonant frequency of the LC series resonant circuit is lower than any of the pass bands of the plurality of filter elements.

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