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Surface acoustic wave transducer and filter with same

A surface acoustic wave and transducer technology, applied to electrical components, impedance networks, etc., can solve problems such as complex matching circuits, poor amplitude-frequency characteristics of filters, and difficulties, and achieve small group delay fluctuations and frequency response squareness Improve the effect of small group delay fluctuation

Active Publication Date: 2015-06-24
CHINA ELECTRONICS TECH GRP CORP CHONGQING ACOUSTIC OPTIC ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For large-bandwidth filters or delay lines, when the relative bandwidth (above 40%) is achieved, the traditional uniform transducer is used. The filter has poor amplitude-frequency characteristics and inherent high loss. If the device is matched, then Matching circuits are complex and difficult

Method used

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  • Surface acoustic wave transducer and filter with same
  • Surface acoustic wave transducer and filter with same
  • Surface acoustic wave transducer and filter with same

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Embodiment

[0022] In the prior art, alloy materials such as aluminum copper can be formed on a piezoelectric substrate by means of magnetron sputtering or electron beam evaporation to form a SAW dispersive transducer, and the sum P of the finger width and the space width changes with its position. For a single-finger transducer, 2P is equal to the wavelength of the instantaneous frequency. If the time-bandwidth product is large enough, the frequency modulation rule is determined by the position of the transducer finger. In the surface acoustic wave transducer of this embodiment, the performance of the dispersion transducer is improved by simply modifying the position of the fingers.

[0023] Surface acoustic wave transducers such as Figure 1~3 As shown, the surface acoustic wave transducer includes a dispersion region 2 in the middle, high-frequency uniform region 1 and low-frequency uniform region 3 respectively located at both ends; the high-frequency uniform region 1 and low-frequenc...

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Abstract

Provided is a surface acoustic wave transducer. The surface acoustic wave transducer comprises a chromatic dispersion area in the middle, a high-frequency even area and a low-frequency even area, and the high-frequency even area and the low-frequency even area are located at the two ends respectively. The high-frequency even area and the low-frequency even area are both non-chromatic-dispersion areas. Due to the fact that the structure of the non-chromatic-dispersion tail end is adopted in the surface acoustic wave transducer, a transition belt is steeper through the non-chromatic-dispersion tail end, the frequency response rectangularity is remarkably improved, and group delay fluctuation is small. The invention further provides a filter formed by the surface acoustic wave transducer. The filter is small in group delay fluctuation.

Description

technical field [0001] The invention relates to the field of surface acoustic wave devices, in particular to a surface acoustic wave transducer and a filter containing the surface acoustic wave transducer. Background technique [0002] A transducer is a device that converts electrical, mechanical, or acoustic energy from one form of energy to another. Surface acoustic wave dispersive transducers can be combined into a variety of surface acoustic wave devices, such as pulse stretching and compression lines, wideband filters and wideband delay lines, etc. [0003] SAW pulse broadening and compression lines can be applied to pulse compression, the core technology in modern radar. This pulse compression system generates a long pulse coded in a certain way. In the receiving system, a dispersive transducer is used to form a matched filter. After correlation processing, it becomes a short pulse signal, thus maintaining the resolution of the radar. Generally, the amplitude of the ...

Claims

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Application Information

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IPC IPC(8): H03H9/64
Inventor 姚远曹亮彭锦婕罗丹陈婷婷张铃
Owner CHINA ELECTRONICS TECH GRP CORP CHONGQING ACOUSTIC OPTIC ELECTRONICS CO LTD
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