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Electro acoustic resonator with suppressed transversal gap mode excitation and reduced transversal modes

A transverse mode, resonator technology, applied in the field of electroacoustic resonators, can solve problems such as disturbing filter performance

Pending Publication Date: 2021-07-23
RF360新加坡私人有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in some material systems (e.g., TFSAW), conventional piston mode schemes are not sufficient to achieve acceptable lateral mode suppression and can excite additional modes in the lateral gap region (termed lateral gap modes) that significantly disturb the filter performance

Method used

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  • Electro acoustic resonator with suppressed transversal gap mode excitation and reduced transversal modes
  • Electro acoustic resonator with suppressed transversal gap mode excitation and reduced transversal modes
  • Electro acoustic resonator with suppressed transversal gap mode excitation and reduced transversal modes

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Embodiment Construction

[0069] figure 1 A general aspect of an electroacoustic resonator EAR is shown. The resonator has a piezoelectric material PM on which interdigitated structures IDS are arranged. The interdigitated structure IDS includes interdigitated electrode fingers EF. Each electrode finger EF is connected to one of the two bus bars BB. The interdigitated structure IDS is arranged between acoustic reflectors R comprising reflector fingers. Substantially parallel to the busbar BB, the electroacoustic resonator EAR has a gap short-circuit structure GSS, the effect of which is that the area between the gap short-circuit structure GSS and its corresponding busbar BB is substantially free of electric fields. The gap short-circuit structure GSS comprises conductor strips which are substantially parallel to the conductor strips of the busbar BB and which are arranged in the transverse gap region G between the ends of the electrode fingers EF and the busbar BB of opposite polarity.

[0070] By...

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PUM

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Abstract

An electro acoustic resonator is provided. The resonator has a gap short structure (GSS) to electrically short at least an area of the transversal gap to suppress transversal gap mode excitations. The gap short structure may be provided by a conductive stripe in the gap and parallel to or inclined with respect to the bus bar (BB) shorting adjacent IDT fingers. Additional connectors between the stripe and the bus bar may be provided. The connectors may have different pitch or metallization ratio with respect to the ID fingers. The connectors may be offset from the position of the fingers and my be inclined with respect to the bus bars. Multiple parallel stripes in the gap may provide a transversal reflector. By using a gap short structure a further improved transversal mode suppression of piston mode designs can be achieved.

Description

technical field [0001] The present invention relates to electroacoustic resonators with suppressed excitation of transverse gap modes and reduced transverse modes, to electroacoustic filters, to methods of manufacturing resonators and to methods of reducing the aforementioned spurious modes. Background technique [0002] Electroacoustic resonators can be used to create RF filters, for example, for wireless mobile communication devices. [0003] Electroacoustic resonators have electrode structures and piezoelectric materials. Electroacoustic resonators convert between electromagnetic and acoustic RF signals due to the piezoelectric effect. From publication WO 2011 / 088904 A1, a transducer structure for obtaining an electroacoustic resonator in piston mode is known. A transverse acoustic waveguide with reduced transverse modes is achieved by tuning the transverse acoustic velocity distribution. [0004] Transverse acoustic waveguiding is achieved by using a transverse gap wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H9/02
CPCH03H9/02858H03H9/02881H03H9/02992H03H9/0274H03H9/25H03H9/02H03H3/08H03H9/145H03H9/6406
Inventor C·许克
Owner RF360新加坡私人有限公司
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