DMS filter and duplexer for improving pass band flatness
A flatness and filter technology, applied in electrical components, impedance networks, etc., can solve problems such as increasing insertion loss, affecting device performance, and unreasonable interdigital parameters, eliminating passband notch and improving passband flatness. degree, reducing the effect of in-band insertion loss
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[0024] A reconstructed filter of the ultrawne adjustment range provided by the present invention will be described in detail below with reference to the accompanying drawings and examples. It should be noted that the specific embodiments of the present invention are not limited to the embodiments provided.
[0025] An DMS filter for improving the passage flatness of the present invention, including: a piezoelectric substrate, and N input and output of the piezoelectric substrate, alternately distributed along the acoustic surface wave propagation direction The IDT, the two sides of the n IDT are provided with a reflective gate, and the end electrode of the adjacent two IDT refers to the opposite; in the n IDT, the X-x Tt and the n + 1-x IDT are mirror symmetry relationships. N is an odd number greater than or equal to 5; the total number of electrodes of each IDT refers to an odd number greater than or equal to 3.
[0026] It will be appreciated that in the embodiment of the prese...
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