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Acoustic wave filter

An elastic wave filter and elastic wave technology, applied in electrical components, impedance networks, etc., can solve problems such as deterioration of attenuation characteristics, achieve good attenuation characteristics, and inhibit the deterioration of transmission response characteristics.

Inactive Publication Date: 2013-04-17
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the transmission response characteristic changes from the design value, and the attenuation characteristic deteriorates

Method used

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  • Acoustic wave filter
  • Acoustic wave filter
  • Acoustic wave filter

Examples

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Embodiment Construction

[0072] refer to Figure 1 to Figure 8 , a SAW filter as an example of an elastic wave filter according to an embodiment of the present invention will be described. The elastic wave filter is a bandpass filter, such as lithium niobate (LiNbO 3 ) etc. on a piezoelectric substrate 11, including tapered input-side IDT electrodes 12 and output-side IDT electrodes 13 spaced apart from each other in the propagation direction of the elastic wave (left-right direction), and as described below, in the passband The lower domain side and the higher domain side of the passband respectively form attenuation domains. In the example, the input-side IDT electrode 12 and the output-side IDT electrode 13 are respectively arranged on figure 1 the left and right sides of the . figure 1 Among them, 21 and 22 are input ports and output ports respectively, and 23 is a ground port. and, figure 1 Among them, 15 is a shield electrode (shield electrode), and 16 is a sound absorbing material (damp...

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Abstract

Disclosed is a pass band type acoustic wave filter capable of obtaining an excellent attenuation characteristic in attenuation bands, in which an IDT electrode having a meander structure is used as at least one of the input-side electrode and the output-side electrode, and the attenuation band is provided over / under the pass band. An electrode having a meander structure in which a plurality of IDT blocks are connected to each other in series between the input port or the output port and the ground port is arranged as the input-side IDT electrode and the output-side IDT electrode, and the electrode finger between the neighboring IDT blocks is removed, so as to suppress excitation of an undesired acoustic wave.

Description

technical field [0001] The present invention relates to an elastic wave filter, such as a surface acoustic wave (Surface Acoustic Wave, SAW) filter. Background technique [0002] As bandpass filters for various communications, filters using surface acoustic waves (SAW, hereinafter referred to as "elastic waves") are known. In recent years, with the high speed and large capacity of wireless data communication, the requirements for low loss, wide bandwidth, high flatness, high selectivity and miniaturization in this kind of bandpass filter Strengthened year by year. To cope with this requirement, a tapered filter is advantageous. [0003] The tapered filter is configured by arranging electrode finger groups between a pair of bus bars of interdigital transducer (IDT) electrodes in a cone shape, and placing the IDT electrodes along the They are arranged on the piezoelectric substrate along the propagating direction of the elastic wave to serve as input-side electrodes and out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/64H03H9/145
CPCH03H9/14535H03H9/14552H03H9/14558
Inventor 津田忠秋
Owner NIHON DEMPA KOGYO CO LTD
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