Surface acoustic wave filter
A surface acoustic wave and high-frequency surface acoustic wave technology, applied in the field of filters, can solve the problem that the relative bandwidth of SAW cannot be enlarged, and achieve the effect of improving performance and saving costs
Inactive Publication Date: 2021-09-03
TIANTONG RUIHONG TECH CO LTD
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Problems solved by technology
[0004] The embodiment of the present invention provides a surface acoustic wave filter, which aims to solve the technical problem that the relative bandwidth of conventional SAW cannot be enlarged
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[0037] The present invention is further detailed in conjunction with the accompanying drawings and examples. It will be appreciated that the specific embodiments described herein are merely illustrative of the invention and are not limited thereto. It will also be noted that in order to facilitate the description, only the parts associated with the present invention are shown in the drawings rather than all structures.
[0038] In the case of an unable conflict, the features and embodiments in the present invention can be combined with each other.
[0039] The term "comprising" as used in the present invention and its deformation is open to include, ie, including but not limited to. The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment".
[0040] Note that, in the present invention, reference to "first," "second," "third," and so only used to distinguish the respective contents, or in order not to limit the interdependence. ...
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The embodiment of the invention discloses a surface acoustic wave filter. The surface acoustic wave filter comprises two surface acoustic wave band elimination filters, a low-pass filter and a high-pass filter; the surface acoustic wave band elimination filters, the low-pass filter and the high-pass filter are cascaded to form a surface acoustic wave filter, and frequency bands blocked by the two surface acoustic wave band elimination filters are different. According to the surface acoustic wave filter designed by utilizing the technical scheme, the two surface acoustic wave band elimination filters are used for clamping a required pass band, and then the low-pass filter and the high-pass filter are used for inhibiting low-frequency signals and high-frequency signals, so that the surface acoustic wave filter meets the requirement of an ultra wide band of any frequency band; therefore, the technical problem that the relative bandwidth of the conventional SAW cannot be increased is solved, the performance of the surface acoustic wave filter is improved, and the cost of the surface acoustic wave filter is saved.
Description
Technical field [0001] Embodiment of the invention relates to a filter technical field, particularly to a surface acoustic wave filter. Background technique [0002] In recent years, the fifth generation of mobile communications technology (5th Generation Mobile CommunicationTechnology, 5G) rapid development, used the SAW filter (Surface AcousticWave, SAW) in many products. Such as mobile phones, the medium navigator, and SAW technology nowadays ushered in new needs and challenges. [0003] Currently, the design of the SAW, using conventional bandpass filter design methods. The design method is due to the limitations of the material, so that the electromechanical coupling coefficient can not do high, resulting in a further relative bandwidth can not be bigger, to do more than 9% has been very difficult, and with the relative bandwidth expansion, costs rise sharply. Inventive content [0004] Embodiment of the present invention provides a surface acoustic wave filter, to solve th...
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IPC IPC(8): H03H9/64H03H9/02
CPCH03H9/64H03H9/02535
Inventor 弗兰克·李黄磊
Owner TIANTONG RUIHONG TECH CO LTD