US 2017/0012600 A1 · TRANSMISSION AND RECEPTION DEVICE

Abstract

A transmission and reception device includes a control unit, an antenna duplexer, a transmission circuit, a reception circuit, a detection unit, an antenna matching circuit, and a load adjustment circuit. The detection unit is connected to an antenna side of the antenna duplexer. The detection unit detects a reflection signal generated as a transmission signal is reflected by the antenna. The control unit adjusts element values of a capacitor a resistance constituting the load adjustment circuit on the basis of the detected reflection signal. The load adjustment circuit is connected to the antenna duplexer. By adjusting the element value of the load adjustment circuit, the impedance of the antenna duplexer is adjusted and the impedance between the antenna and the antenna duplexer is matched.

Claims11

Dependent claims

A transmission and reception device, comprising:

an antenna duplexer that outputs, to an antenna terminal, a high-frequency signal that has been input through a transmission signal input terminal and outputs, to a reception signal output terminal, a high-frequency signal that has been input through the antenna terminal, the antenna duplexer comprising a plurality of inductors coupled to each other;
a load adjustment circuit connected to the antenna duplexer, the load adjustment circuit including a variable circuit element;
and
a control circuit that detects a variation in an impedance of an antenna connected to the antenna terminal, and controls a value of the variable circuit element in the load adjustment circuit.

1 more element

Dependencies are inferred from the claim text.

Transmission and reception device

Life of this patent

Transmission and reception device

Life of this patent

Abstract

Claims11