Patent ID: 11955931
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 17:
18. The power amplifier unit according to claim 11, wherein
the filter is between the fourth input terminal and the fourth output terminal and includes N-stage cascaded unit filter circuits, N being a natural number,
each of the unit filter circuits includes
a first terminal,
a second terminal,
a series resonant circuit or a parallel resonant circuit,

in the N-stage cascaded unit filter circuits,
the first terminal of the first-stage unit filter circuit is connected to the fourth input terminal,
the second terminal of the last-stage unit filter circuit is connected to the fourth output terminal, and
at least part of the even-ordered harmonic and the odd-ordered harmonic contained in the fifth radio-frequency signal input to the fourth input terminal of the filter is attenuated by resonance between the capacitor and the inductor included in the resonant circuit.