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SAW (Surface Acoustic Wave) device of bus bar doubled as reflecting grating type IDT (Interdigital Transducer) structure

A technology of bus bars and reflection grids, applied in electrical components, impedance networks, etc., can solve the problems of large insertion loss, poor side lobe suppression, and unsatisfactory waveform band steepness, and achieve the effect of reducing the die area.

Inactive Publication Date: 2010-10-13
GUANGXI DONGXING DINGKANG PLASTIC IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a SAW device in which the bus bar doubles as a reflective grid IDT structure, so as to overcome the poor sidelobe suppression of the surface acoustic wave filter or the surface acoustic wave resonator in the prior art. Deficiencies such as large loss and unsatisfactory out-of-band steepness of the waveform

Method used

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  • SAW (Surface Acoustic Wave) device of bus bar doubled as reflecting grating type IDT (Interdigital Transducer) structure
  • SAW (Surface Acoustic Wave) device of bus bar doubled as reflecting grating type IDT (Interdigital Transducer) structure
  • SAW (Surface Acoustic Wave) device of bus bar doubled as reflecting grating type IDT (Interdigital Transducer) structure

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Embodiment 1. The structure of the triangular IDT die in which the bus bar doubles as a reflective grid is as follows: Figure 4 As shown, the mark 1 in the figure indicates that the figure in the dotted line box is an IDT in which the bus bar doubles as a reflective grid (and is also a part of the die structure); the mark 2 in the figure represents the input IDT; the mark in the figure 3 represents the output interdigital transducer; the mark 4 in the figure represents the structural diagram in the dotted line frame, and the IDT of the triangular structure of the bus bar of the present invention doubles as the reflective grid is etched on the surface of the piezoelectric substrate or piezoelectric film and made The core of the surface acoustic wave filter (or surface acoustic wave resonator) (the packaging shell, layout and the outline of the piezoelectric substrate or piezoelectric film are not drawn). The width of the interdigitated electrodes is a, the electrode int...

Embodiment 2

[0032] Embodiment 2, the structure of the circular IDT tube core in which the bus bar doubles as a reflective grid is as follows: Figure 7 As shown, the mark 1 in the figure indicates that the figure in the dotted line box is an IDT in which the bus bar doubles as a reflective grid (and is also a part of the die structure); the mark 2 in the figure represents the input IDT; the mark in the figure 3 represents the output interdigital transducer; the mark 4 in the figure represents the structural diagram in the dotted line frame, and the IDT of the circular structure that the bus bar of the present invention doubles as the reflection grid is etched on the surface of the piezoelectric substrate or piezoelectric film and made The tube core of the surface acoustic wave filter (or surface acoustic wave resonator) (the packaging shell, layout and the outline of the piezoelectric substrate or piezoelectric film are not drawn). The width of the interdigitated electrodes is a, the elec...

Embodiment 3

[0033] Embodiment 3, the structure of the elliptical IDT tube core in which the bus bar doubles as a reflection grid is as follows: Figure 10 As shown, the mark 1 in the figure indicates that the figure in the dotted line box is an IDT in which the bus bar doubles as a reflection grid (and is also a part of the die structure); the mark 2 in the figure indicates that the bus bar doubles as an elliptical input finger of the reflection grid Transducer; Mark 3 in the figure represents the elliptical output interdigital transducer that bus bar doubles as reflection grid; Mark 4 in the figure represents the structural figure in the dotted line frame is that bus bar of the present invention doubles as the elliptical structure of reflection grid The IDT is etched on the surface of the piezoelectric substrate (or piezoelectric film) and the core of the surface acoustic wave filter or the surface acoustic wave resonator (packaging shell, layout and the wheel of the piezoelectric substra...

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Abstract

The invention discloses an SAW (Surface Acoustic Wave) device of a bus bar doubled as a reflecting grating type IDT (Interdigital Transducer) structure, comprising a surface acoustic wave filter and a surface acoustic wave resonator. The surface acoustic wave filter and the surface acoustic wave resonator comprise a packaging shell and tube cores of the surface acoustic wave filter and the surface acoustic wave resonator, wherein the two tube cores are electrically connected in the packing shell by using a conducting wire; and the tube cores comprise an input interdigital transducer with a bus bar doubled as a reflecting grating and an output interdigital transducer with a bus bar doubled as a reflecting grating, and the input interdigital transducer and the output interdigital transducer are etched on the surface of a piezoelectric monocrystal or a piezoelectric film. The bus bar doubled as the reflecting grating is in a triangular, circular or elliptic structure. Under the condition of same tube core areas, interdigital numbers and coupling hole diameters of the surface acoustic wave filter and the surface acoustic wave resonator with the IDT structure design, the sidelobe suppression is improved by more than 9dB, and the insertion loss is lowered by more than 12dB.

Description

technical field [0001] The invention relates to a surface acoustic wave device, in particular to a surface acoustic wave device comprising a surface acoustic wave band-pass filter or a surface acoustic wave resonator. Background technique [0002] Since there is no center of symmetry in the crystal structure of piezoelectric materials (piezoelectric single crystal or piezoelectric film), when a voltage is applied to the piezoelectric material, the crystal lattice in the piezoelectric single crystal or piezoelectric film will be deformed. If the applied voltage is the input voltage signal, a surface acoustic wave (SurfaceAcousticWave, referred to as SAW) will be generated in the surface lattice of the piezoelectric single crystal or piezoelectric film. Propagation, an elastic wave whose amplitude decays rapidly with increasing depth into a crystalline material. [0003] The filtering of surface acoustic wave filter or surface acoustic wave resonator, the realization of res...

Claims

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Application Information

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IPC IPC(8): H03H9/25H03H9/64
Inventor 王代强徐稀嫔杨发顺刘桥
Owner GUANGXI DONGXING DINGKANG PLASTIC IND
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