Surface acoustic wave transducer and filter containing the surface acoustic wave transducer

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

Active Publication Date: 2018-02-02
CETC CHIPS TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 containing the surface acoustic wave transducer
  • Surface acoustic wave transducer and filter containing the surface acoustic wave transducer
  • Surface acoustic wave transducer and filter containing the surface acoustic wave transducer

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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

The surface acoustic wave transducer provided by the present invention, the surface acoustic wave transducer includes a dispersion region located in the middle, and a high-frequency uniform region and a low-frequency uniform region respectively located at both ends; the high-frequency uniform region and the low-frequency uniform region are both non-dispersive area. Since the surface acoustic wave transducer adopts a non-dispersive structure at the end, the non-dispersive end makes the transition zone steeper, that is, the squareness of the frequency response is significantly improved, and the group delay fluctuation is small. The invention also provides a filter composed of the surface acoustic wave transducer, which has smaller 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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Patent Type & Authority Patents(China)
IPC IPC(8): H03H9/64
Inventor 姚远曹亮彭锦婕罗丹陈婷婷张铃
Owner CETC CHIPS TECH GRP CO LTD
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