Electronic component and communication apparatus
An electronic component includes a first input/output port, a second input/output port, a third input/output port, a first circuit that is a characteristic impedance converter circuit provided between the first input/output port and the second input/output port, a second circuit that is a characteristic impedance converter circuit provided between the first input/output port and the third input/output port, and a third circuit provided between the second input/output port and the third input/output port, the third circuit having a circuit configuration where a complex conjugate relationship is made with each of the first and second circuits.
1 . An electronic component comprising:
a first input/output port;
a second input/output port;
a third input/output port;
a first circuit that is a characteristic impedance converter circuit provided between the first input/output port and the second input/output port;
a second circuit that is a characteristic impedance converter circuit provided between the first input/output port and the third input/output port; and
a third circuit provided between the second input/output port and the third input/output port, wherein:
each of the first to third circuits includes at least one inductor and at least one capacitor;
the at least one inductor in the third circuit is provided in the third circuit so as to be in a complex conjugate relationship with the at least one capacitor in each of the first and second circuits;
the at least one capacitor in the third circuit is provided in the third circuit so as to be in a complex conjugate relationship with the at least one inductor in each of the first and second circuits;
the first circuit includes, as the at least one inductor and the at least one capacitor, a first inductor provided in a first path that connects the first input/output port and the second input/output port, and a first capacitor;
the second circuit includes, as the at least one inductor and the at least one capacitor, a second inductor provided in a second path that connects the first input/output port and the third input/output port, and a second capacitor; and
the third circuit includes, as the at least one inductor and the at least one capacitor, a third capacitor connected in series with the first inductor, a fourth capacitor connected in series with the second inductor, and a third inductor.
2 . The electronic component according to claim 1 , wherein the electronic component is a divider and combiner.
3 . The electronic component according to claim 1 , wherein:
the third circuit further includes a resistor element; and
the third inductor and the resistor element are provided in parallel between the third capacitor and the fourth capacitor.
4 . The electronic component according to claim 3 , wherein the circuit configuration of the third circuit is a configuration that is symmetrical about the third inductor and the resistor element.
5 . The electronic component according to claim 1 , wherein:
the first capacitor and the second capacitor are connected to each other.
6 . The electronic component according to claim 1 , further comprising a matching circuit provided between the first input/output port and the first and second circuits.
7 . The electronic component according to claim 6 , wherein:
the first circuit, the second circuit, and the matching circuit branch from one node; and
the matching circuit includes a matching circuit capacitor provided in a third path that connects the first input/output port and the node, and a matching circuit inductor provided between the third path and a ground.
8 . The electronic component according to claim 1 , wherein the first circuit and the second circuit are each connected to a ground.
9 . The electronic component according to claim 1 , wherein the first circuit and the second circuit are connected through a plurality of paths without via the third circuit.
10 . The electronic component according to claim 9 , wherein each of the first circuit and the second circuit is not connected to a ground.
11 . The electronic component according to claim 1 , further comprising:
a fourth input/output port;
a fourth circuit that is a characteristic impedance converter circuit provided between the first input/output port and the fourth input/output port; and
a fifth circuit provided between the third input/output port and the fourth input/output port, the fifth circuit having a circuit configuration where a complex conjugate relationship is made with each of the second and fourth circuits.
12 . The electronic component according to claim 11 , wherein the second circuit is connected to the first circuit through a plurality of paths without via the third circuit, and is connected to the fourth circuit through a plurality of paths without via the fifth circuit.
13 . The electronic component according to claim 1 , wherein:
the first capacitor is provided between the first path and the ground; and
the second capacitor is provided between the second path and the ground.
14 . A communication apparatus comprising:
an electronic component; and
at least one antenna that is connected to the electronic component, wherein:
the electronic component comprises:
a first input/output port;
a second input/output port;
a third input/output port;
a first circuit that is a characteristic impedance converter circuit provided between the first input/output port and the second input/output port;
a second circuit that is a characteristic impedance converter circuit provided between the first input/output port and the third input/output port; and
a third circuit provided between the second input/output port and the third input/output port;
each of the first to third circuits includes at least one inductor and at least one capacitor;
the at least one inductor in the third circuit is provided in the third circuit so as to be in a complex conjugate relationship with the at least one capacitor in each of the first and second circuits;
the at least one capacitor in the third circuit is provided in the third circuit so as to be in a complex conjugate relationship with the at least one inductor in each of the first and second circuits;
the first circuit includes, as the at least one inductor and the at least one capacitor, a first inductor provided in a first path that connects the first input/output port and the second input/output port, and a first capacitor;
the second circuit includes, as the at least one inductor and the at least one capacitor, a second inductor provided in a second path that connects the first input/output port and the third input/output port, and a second capacitor; and
the third circuit includes, as the at least one inductor and the at least one capacitor, a third capacitor connected in series with the first inductor, a fourth capacitor connected in series with the second inductor, and a third inductor.