Multiplexer, transmission apparatus, and reception apparatus
First Claim
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; and
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;
whereina capacitance of the largest capacitance is greater than capacitances of the remaining ones of the plurality of filter elements;
an inductive component of the inductance element and a capacitive component of the first filter element define an LC series resonant circuit;
a resonant frequency of the LC series resonant circuit is lower than any of the pass bands of the plurality of filter elements; and
the resonant frequency of the LC series resonant circuit satisfies the equation
1 Assignment
0 Petitions
Accused Products
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.
33 Citations
20 Claims
-
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; and 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;
whereina capacitance of the largest capacitance is greater than capacitances of the remaining ones of the plurality of filter elements; an inductive component of the inductance element and a capacitive component of the first filter element define an LC series resonant circuit; a resonant frequency of the LC series resonant circuit is lower than any of the pass bands of the plurality of filter elements; and the resonant frequency of the LC series resonant circuit satisfies the equation - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 17, 18, 19, 20)
-
-
14. 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; and 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;
whereina capacitance of the smallest capacitance is smaller than capacitances of the remaining ones of the plurality of filter elements; an inductive component of the inductance element and a capacitive component of the second filter element define an LC series resonant circuit; a resonant frequency of the LC series resonant circuit is higher than any of the pass bands of the plurality of filter elements; and the resonant frequency of the LC series resonant circuit satisfies the equation - View Dependent Claims (15, 16)
-
Specification