Filter

A filter and resonator technology, applied in impedance networks, electrical components, multi-terminal-pair networks, etc., can solve problems such as increasing process steps

Pending Publication Date: 2018-06-15
湖北宙讯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a filter to solve the problem in the related art that parallel resonators require multiple layers of mass-loaded layers to increase the number of process steps

Method used

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Embodiment Construction

[0027] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiment of the application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the application. Obviously, the described embodiment is only It is an embodiment of a part of the application, but not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0029] It should be noted that the terms "first" and "second" in ...

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Abstract

The invention discloses a filter. The filter comprises at least a series resonator and at least two parallel resonators. The parallel resonator or the series resonator comprises a weight load layer, wherein the density of the weight load layer is adjustable. According to the filer provided by the invention, the effect that the parallel resonator can adjust the resonant frequency of the resonator in the filter by only needing one weight load layer is achieved.

Description

technical field [0001] The present invention relates to the communication field, in particular to a filter. Background technique [0002] Duplexer or filter is one of the important components of handheld mobile communication products. At present, handheld mobile communication products mainly use duplexers or filters based on piezoelectric materials, such as film bulk acoustic wave duplexers or filters. Thin film bulk acoustic resonator is the basic unit of piezoelectric bulk acoustic wave filter and duplexer. The working area of ​​thin film bulk acoustic resonator is composed of metal bottom electrode-piezoelectric film-metal upper electrode, and the device works in thickness vibration mode. The operating frequency is inversely proportional to the thickness of the piezoelectric material. When an electrical signal is loaded on the film bulk acoustic resonator, the piezoelectric film in the device converts the electrical signal into an acoustic signal through the inverse pie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/075
CPCH03H7/075
Inventor 周冲周文喜
Owner 湖北宙讯科技有限公司
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