Dual-band surface acoustic wave filter and composite high-frequency component

摘要

A dual-band surface acoustic wave filter is mounted on a circuit board together with a high-frequency switch, constitutes a composite high-frequency component together with the high-frequency switch, and significantly reduces and prevents deterioration of filter characteristics of the composite high-frequency component. A first input terminal is located on a first corner portion of a second principal surface of a wiring board. A second input terminal is located on the second principal surface of the wiring board and along a first long side or a first short side so as to be next to the first input terminal. First and second output terminals are arranged on an edge portion of the second principal surface of the wiring board on a second long side and along the second long side.

主权项

1. A dual-band surface acoustic wave filter comprising:
a wiring board including first and second long sides, first and second short sides, a first corner portion defined by the first long side and the first short side, a second corner portion defined by the second long side and the second short side, and first and second principal surfaces; a first surface acoustic wave chip mounted on the first principal surface of the wiring board and including a first piezoelectric substrate and a first surface acoustic wave filter portion that is located on the first piezoelectric substrate; and a second surface acoustic wave chip mounted on the first principal surface of the wiring board and including a second piezoelectric substrate and a second surface acoustic wave filter portion that is located on the second piezoelectric substrate and has a band different from that of the first surface acoustic wave filter portion; wherein the first surface acoustic wave filter portion includes a first input pad electrode and a first output pad electrode; the second surface acoustic wave filter portion includes a second input pad electrode and a second output pad electrode; a first input terminal electrically connected to the first input pad electrode, a second input terminal electrically connected to the second input pad electrode, a first output terminal electrically connected to the first output pad electrode, and a second output terminal electrically connected to the second output pad electrode are located on the second principal surface of the wiring board; the first input terminal is located on the first corner portion of the second principal surface of the wiring board; the second input terminal is located on the second principal surface of the wiring board and along the first long side or the first short side so as to be next to the first input terminal; and the first and second output terminals are arranged on an edge portion on a second-long-side side of the second principal surface of the wiring board and along the second long side.