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    • 3. 发明申请
    • Acoustic wave transducer with transverse mode suppression
    • 具有横向模式抑制的声波换能器
    • US20070018755A1
    • 2007-01-25
    • US10563890
    • 2004-06-16
    • Markus MayerRalph StommerGunter KovacsAndreas BergmannPasi Tikka
    • Markus MayerRalph StommerGunter KovacsAndreas BergmannPasi Tikka
    • H03H9/64
    • H03H9/02992H03H9/02881H03H9/14532H03H9/1455
    • The invention relates to a transducer that works with surface acoustic waves in which interfering transversal modes are suppressed. This is accomplished by mutually adapting to one another the transversal excitation profile of the acoustic wave and the transversal basic mode of the waveguide formed by the acoustic spur and adjacent exterior areas. This adaptation is accomplished by dividing the acoustic spur into an excitation area and marginal areas, whereby the width of a marginal area is approximately one-quarter wavelength of the transversal basic mode, and whereby the wave number of the transversal basic mode in the excitation area is zero. In one advantageous further development of the invention, an excitation strength that is a function of the transversal coordinate can be attained that is optimally adapted to the basic mode by dividing the excitation area in the transversal direction into partial spurs that are wired to one another serially and/or in parallel.
    • 本发明涉及一种能够抑制干扰横向模式的表面声波工作的换能器。 这是通过彼此相互适应的声波的横向激励分布和由声学支线和相邻的外部区域形成的波导的横向基本模式来实现的。 这种适应是通过将声学刺激分成激发区域和边缘区域来实现的,由此边缘区域的宽度大约是横向基本模式的四分之一波长,并且由此激励区域中的横向基本模式的波数 是零。 在本发明的一个有利的进一步发展中,可以获得作为横向坐标的函数的激励强度,其通过将横向方向上的激励区域划分为相互连接的部分马刺来最佳地适应于基本模式 和/或并行。