Patent ID: 6750737
Filing Date: 2004-06-15
Classification: H03H,H05K

Abstract:
A high-frequency switch having a plurality of signal paths corresponding to a plurality of frequency bands,the high-frequency switch, comprising: a branching filter circuit which combines transmitted signals from the plurality of signal paths during transmission and distributes received signals to the plurality of signal paths during reception, a plurality of transmit-receive switch circuits of switching the plurality of signal paths to a transmitting part and a receiving part, and a plurality of filters disposed in the signal paths, wherein at least one of a strip line and a capacitor which constitute the branching filter circuit, the plurality of transmit-receive switch circuits, and the plurality of filters is formed as an electrode in a layered body, at least one of the plurality of filters is constituted by the SAW filter, the SAW filter is mounted on a surface of the layered body, and the layered body is a layered body of mounting at least one SAW filter comprising: a surface dielectric layer having a surface layer electrode pattern formed thereon, and a first dielectric layer having a pair of electrode patterns and a first ground electrode pattern formed thereon, wherein a pair of balanced output terminals of the SAW filter of unbalanced input-balanced output are connected respectively to the pair of electrode patterns via the surface layer electrode pattern, and a part of the first ground electrode pattern is disposed between the pair of the electrode patterns.