Multiplexer, transmission apparatus, and reception apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorMasato Araki
Life of this patent
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Abstract
A multiplexer includes a common terminal connected to an inductance element at a connection path with an antenna element, filter elements including different pass bands and connected to the antenna element with the common terminal therebetween, and an inductance element arranged in series between a transmission filter with a largest capacitance when viewed from the antenna side among the filter elements and the common terminal. An inductive component of the inductance element and a capacitive component of the transmission filter element define an LC series resonant circuit, and a resonant frequency of the LC series resonant circuit is lower than any of pass bands of the filter elements.
Claims20
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;
- wherein
- when 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.
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 second filter element with a smallest 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 second filter element with the smallest capacitance;
- wherein
- when the circuit element is arranged in parallel between the inductance element and the second 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 second 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 second 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 higher than any of the pass bands of the plurality of filter elements.
Dependencies are inferred from the claim text.