Filter and multiplexer
AssigneeMurata Manufacturing Co., Ltd.
InventorsMasanori KATO, Minoru IWANAGA, Hiroshi MATSUBARA
Life of this patent
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Abstract
A filter includes a resonant circuit defining at least a portion of a signal path connected between a first terminal and a second terminal, an elastic wave resonator including one end that is grounded, a first inductor including one end connected to one end of the resonant circuit and another end connected to another end of the elastic wave resonator, and a second inductor including one end connected to another end of the resonant circuit and another end connected to the other end of the elastic wave resonator. The resonant circuit is an LC series resonant circuit in which a third inductor and first and second capacitors are connected in series with each other.
Claims20
A filter comprising:
- a series arm resonant circuit defining at least a portion of a signal path connected between a first terminal and a second terminal;
- a parallel arm resonator including one end that is grounded;
- a first inductor including one end connected to one end of the series arm resonant circuit and another end connected to another end of the parallel arm resonator;
- and
- a second inductor including one end connected to another end of the series arm resonant circuit and another end connected to the another end of the parallel arm resonator;
- wherein
- the series arm resonant circuit is an LC series resonant circuit in which a third inductor and a capacitor are connected in series with each other.
Dependencies are inferred from the claim text.