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3G high rectangle factor acoustic surface wave filter and uses thereof

A surface acoustic wave and filter technology, applied in electrical components, wireless communications, impedance networks, etc., can solve the problems of low rectangularity of filters and difficulty in adapting to 3G communication requirements, and achieve the effect of high rectangularity

Inactive Publication Date: 2009-10-07
BEIJING ZHONGXUN SIFANG SCI & TECH
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  • 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 filter has low rectangularity, and it is difficult to meet the requirements of 3G communication

Method used

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  • 3G high rectangle factor acoustic surface wave filter and uses thereof
  • 3G high rectangle factor acoustic surface wave filter and uses thereof
  • 3G high rectangle factor acoustic surface wave filter and uses thereof

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Experimental program
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Embodiment Construction

[0012] The preferred embodiment of the 3G high-rectangularity SAW filter of the present invention is as follows: figure 1 As shown, including a substrate, an electrode layer is provided on the substrate, and the electrode layer includes an input weighted transducer 1, an output weighted transducer 2, and a coupling electrode 3 is connected between the input weighted transducer 1 and the output weighted transducer 2 coupling.

[0013] The input weighted transducer 1 is provided with an input terminal 4 of a radio frequency circuit; the output weighted transducer 2 is provided with an output terminal 7 of a radio frequency circuit.

[0014] The input weighted transducer 1 and the output weighted transducer 2 are provided with ground electrodes 6, 5, respectively.

[0015] The material of substrate can be 128 ° lithium niobate; The material of electrode layer can be aluminum film, and the thickness of aluminum film can be

[0016] The center frequency of the filter of the pre...

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Abstract

The present invention discloses a 3G high rectangle factor acoustic surface wave filter and uses thereof, including a substrate, an electrode layer comprising an input weighted transducer and an output weighted transducer is provided on the electrode layer, and the input weighted transducer is coupled with the output weighted transducer through coupling electrode. Material of the substrate is lithium niobate of 128 degree; material of the electrode layer is an aluminium film of 4000 thickness. Center frequency of the filter is 70 MHz; 2dB passband is more than or equal to 24 MHz; the relative bandwidth is 34.3%; 40dB stop band is less than or equal to 25.2 MHZ. The rectangle factor is high and can be used for filtering intermediate frequency in base stations of the third generation mobile communication.

Description

technical field [0001] The invention relates to a surface acoustic wave filter, in particular to a 3G high-rectangularity surface acoustic wave filter and its application. Background technique [0002] When the crystal with piezoelectric effect is subjected to mechanical action, it will generate an electric field phenomenon proportional to the pressure; the crystal with piezoelectric effect will also produce elastic deformation and emit mechanical waves (sound waves) when it is acted on by an electrical signal. The electrical signal can be converted into an acoustic signal. Because this sound wave only propagates on the surface of the crystal, it is called surface acoustic wave. [0003] The surface acoustic wave filter (SAWF) has the advantages of small size, light weight, reliable performance, and no need for complicated adjustments. It is a key device for signal reception and processing in wireless communication. [0004] The surface acoustic wave devices in the prior a...

Claims

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Application Information

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IPC IPC(8): H03H9/64H04W88/00
Inventor 张敬钧
Owner BEIJING ZHONGXUN SIFANG SCI & TECH