Ladder-type acoustic wave filter
An elastic wave filter and filter technology, applied in impedance networks, electrical components, etc., can solve the problems of insufficient reduction of passband loss and deterioration of frequency band loss, so as to reduce loss, reduce loss, and realize broadband the effect of
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[0029] Hereinafter, in order to clearly understand the present invention, specific embodiments of the present invention will be described with reference to the drawings.
[0030] figure 1 It is a diagram showing a circuit configuration of a ladder-type elastic wave filter according to an embodiment of the present invention.
[0031] Ladder elastic wave filter 1 has a series arm connecting input terminal 2 and output terminal 3 . In this series arm, a plurality of series arm resonators S1 to S4 are connected in series with each other. Here, from the input terminal 2 side to the output terminal 3 side, these series arm resonators S1- S4.
[0032] In addition, a first parallel arm is formed to connect the connection point between the output terminal 3 and the first series arm resonator S1 to the ground potential, and the first parallel arm has the first parallel arm resonator P1.
[0033] Similarly, the second parallel arm connecting the connection point between the resonator...
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