A Surface Acoustic Wave Filter with High Power Capability

Abstract

The invention discloses a surface acoustic wave filter with high power endurance, which comprises a plurality of surface acoustic wave resonators, wherein each of the surface acoustic wave resonators comprises an interdigital transducer and a reflecting grating; at least part of surface acoustic wave resonators are high-resistance surface acoustic wave resonators; two interdigital transducers are arranged in parallel for the high-resistance surface acoustic wave resonators; two reflecting gratings are shared by two interdigital transducers; an output bus bar of a first interdigital transducer is electrically connected with an input bus bar of a second interdigital transducer; the input bus bar of the first interdigital transducer and the output bus bar of the second interdigital transducer are located at the same end; and the two reflecting gratings are located outside the two interdigital transducers. Under same resistance, the high-resistance surface acoustic wave resonators have more finger pairs or shorter pore diameters, the current on each transducer finger is reduced, and the power endurance of the surface acoustic wave filter is greatly increased under the condition of unchanging the electric property of the surface acoustic wave filter.

Description

technical field [0001] The invention relates to the improvement of surface acoustic wave filter technology, in particular to a low-loss surface acoustic wave impedance element filter with high power bearing capacity and working in the radio frequency band, which belongs to the technical field of surface acoustic wave filters. Background technique [0002] Surface acoustic wave filters have the characteristics of high operating frequency, small size, and suitable for mass production, and are widely used in the field of wireless communication. The surface acoustic wave impedance element filter is fabricated on a piezoelectric substrate, and the main body constituting the surface acoustic wave impedance element filter is a surface acoustic wave resonator. Existing surface acoustic wave resonator structures such as figure 1 As shown, it consists of an IDT with an input bus bar 1 and an output bus bar 2 and two reflection grids 4 and 5 located on both sides of the IDT, and its i...

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the surface acoustic wave filter in the prior art that the power bearing capacity is reduced when it works at high frequency, the purpose of the present invention is to provide a high-frequency, low-loss surface acoustic wave impedance element filter, the surface acoustic wave impedance element The filter can have higher power handling capacity under the premise of ensuring the excellent electrical performance of the filter

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