Patent ID: 8917520

Claim:
A circuit substrate comprising: a laminate substrate in which a conductive layer and an insulating layer are laminated; a transmit filter chip and a receive filter chip that each have one or more of acoustic wave resonators, the transmit and receive filter chips being provided inside of the laminate substrate, the transmit filter chip being connected between a transmit node and a common node, the reception filter chip being connected between a receive node and the common node, the transmit filter chip and the receive filter chip thereby constituting a duplexer; and first and second chip components provided on a surface of the laminate substrate, the first chip component being connected to the common node, the second chip component being connected to one of the transmit filter chip and the receive filter chip through the transmit node or the receive node, wherein either or both of the following overlaps (a) and (b) are present: (a) the first chip component overlaps with at least one of the transmit filter chip and the receive filter chip in a plan view, (b) the second chip component overlaps with at least said one of the transmit filter chip and the receive filter chip to which the second chip component is connected in a plan view.