Unlock instant, AI-driven research and patent intelligence for your innovation.

SF14003 type surface acoustic wave filter

A SF14003, surface acoustic wave technology, applied in electrical components, impedance networks, etc., can solve the problems of low out-of-band suppression and large filter insertion loss, and achieve the effects of improving out-of-band suppression, reducing insertion loss and reducing loss.

Inactive Publication Date: 2009-06-24
BEIJING ZHONGXUN SIFANG SCI & TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The surface acoustic wave devices in the prior art have at least the following disadvantages: the insertion loss of the filter is large, and the out-of-band rejection is low

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • SF14003 type surface acoustic wave filter
  • SF14003 type surface acoustic wave filter
  • SF14003 type surface acoustic wave filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] The SF14003 type surface acoustic wave filter of the present invention, its preferred specific implementation is as follows figure 1 As shown, it includes a substrate 8, an input transducer 9 and an output transducer 10 are arranged on the substrate 8, the input transducer 9 and the output transducer 10 are coupled to each other, and the input transducer 9 is a finger-weighted transducer The output transducer 10 is an apodization weighted transducer, which can reduce the loss, reduce the insertion loss of the entire filter, and improve the out-of-band suppression.

[0012] The substrate 8 can be a 112° lithium tantalate substrate, that is, the substrate 8 is made of 112° lithium tantalate (112° LT), and its temperature coefficient is 18ppm / °C, and the transducers 9, 10 and 112° LT The coupling coefficient is large, which can further achieve low loss. Other materials can also be used as required.

[0013] like Figure 2a , Figure 2b As shown, the present invention i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a SF14003 surface acoustic wave filter, which comprises 112 degrees lithium tantalate substrate, an input transducer and an output transducer arranged on the substrate; wherein, the input transducer and the output transducer are respectively a withdrawal-weighted transducer and an apodized-weighted transducer. The center frequency of the filter is 139.9-140.1MHz, and -1dB bandwidth is 1.39-1.41MHz. The SF14003 surface acoustic wave filter has low loss, narrowband and high out-of-band rejection, and can satisfy the application requirements in radio stations or other occasions.

Description

technical field [0001] The invention relates to a surface acoustic wave filter, in particular to a SF14003 type surface acoustic wave filter. Background technique [0002] When a crystal with piezoelectric effect is subjected to mechanical action, an electric field proportional to the pressure will be generated; when a crystal with piezoelectric effect is subjected to electrical signals, it will also produce elastic deformation and emit mechanical waves (sound waves), The electrical signal can be converted into an acoustic signal. Since this kind of sound wave only propagates on the surface of the crystal, it is called surface acoustic wave. [0003] Surface Acoustic Wave Filter (SAWF) has the advantages of small size, light weight, reliable performance, and does not require complex adjustment. It is a key device for signal reception and processing in wireless communication. [0004] The surface acoustic wave device in the prior art has at least the following disadvantages...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64H03H9/02
Inventor 张敬钧
Owner BEIJING ZHONGXUN SIFANG SCI & TECH