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1.发明授权Surface acoustic wave filter including saw resonators with transmission spaces therein 失效表面声波滤波器，包括带有传输空间的SAW谐振器
公开(公告)号：US5115216A
公开(公告)日：1992-05-19
申请号：US335140
申请日：1989-04-07
CPC分类号： H03H9/6483 , H03H9/02755 , H03H9/6463 , H03H9/6479 , H03H9/02921
摘要： Disclosed is a SAW filter employing a SAW resonator which is constructed of a plurality of pairs of electrode fingers formed on a piezoelectric substrate, and in which a plurality of SAW transmission spaces are included. The SAW transmission spaces do not have the function of exciting a SAW, and they have electric lengths which match the phases of SAWs excited by the resonator. In accordance with frequency characteristics required of the filter, such SAW transmission spaces are introduced into, for example, one of a plurality of SAW resonators located on the electric power input side of the filter.
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公开(公告)号：US5235234A
公开(公告)日：1993-08-10
申请号：US785524
申请日：1991-10-31
IPC分类号： H03H9/145
CPC分类号： H03H9/14502
摘要： A surface acoustic wave device comprises a piezoelectric substrate and a plurality of electrode fingers which are located on the piezoelectric substrate along the propagation direction of a surface acoustic wave. The electrode fingers are located on the piezoelectric substrate at a pitch of about 1.5.lambda.o/2 (where a symbol .lambda.o indicates a wavelength of a surface acoustic wave with a frequency equivalent to the center frequency of the surface acoustic wave device). The width of each of the electrode fingers is about 1.5.lambda.o/4. The electrode fingers are located on the substrate so as to be electrically independent of an external circuit and each other.Since the width of electrode fingers is about 1.5.lambda.o/4, the surface acoustic wave device can be produced without fine processing techniques.
摘要翻译： 表面声波装置包括压电基板和沿着声表面波的传播方向位于压电基板上的多个电极指。 电极指以约1.5λo/ 2的间距位于压电基板上（其中符号λo表示具有与声表面波装置的中心频率相当的频率的表面声波的波长）。 每个电极指的宽度为约1.5λo / 4。 电极指位于基板上，以便与外部电路彼此电独立。 由于电极指的宽度为约1.5λo / 4，所以可以在没有精细加工技术的情况下制造表面声波装置。
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3.发明授权Surface acoustic wave band-pass filter with different phase weighted transducers 失效带不同相位称重传感器的表面声波通带滤波器
公开(公告)号：US5087901A
公开(公告)日：1992-02-11
申请号：US490446
申请日：1990-03-08
CPC分类号： H03H9/6426 , H03H9/02748 , H03H9/1455
摘要： At least one electro-acoustic transducer of a first surface acoustic wave device and acousto-electric transducers of a second surface acoustic wave device are arranged symmetrically to the first surface acoustic wave device about a line parallel to a propagating direction of surface acoustic wave and is phase-weighted differently from the remaining transducers having common phase-weighting, to improve an attenuation for stop frequency.
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公开(公告)号：US5065065A
公开(公告)日：1991-11-12
申请号：US526508
申请日：1990-05-21
IPC分类号： H03H9/145
CPC分类号： H03H9/14502
摘要： A surface acoustic wave device comprises a piezoelectric substrate and a plurality of electrode fingers which are located on the piezoelectric substrate along the progagation direction of a surface acoustic wave. The electrode fingers are located on the piezoelectric substrate at a pitch of about 1.5.lambda.o/2 (where a symbol .lambda.o indicates a wavelength of a surface acoustic wave with a frequency equivalent to the center frequency of the surface acoustic wave device). The width of each of the electrode fingers is about 1.5.lambda.o/4. The electrode fingers are located on the substrate so as to be electrically independent of an external circuit and each other.Since the width of electrode fingers is about 1.5.lambda.o/4, the surface acoustic wave device can be produced without fine processing techniques.
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公开(公告)号：US5010269A
公开(公告)日：1991-04-23
申请号：US282177
申请日：1988-12-09
CPC分类号： H03H9/14505 , H03H9/25
摘要： A SAW resonator includes resonating SAW transducer units formed on a piezoelectric substrate and juxtaposed in a direction of propagation of acoustic waves, and a unidirectionally reflecting SAW transducer unit provided in each end of the juxtaposed resonating SAW transducer units on the substrate. Each resonating SAW transducer unit includes first and second SAW transducers connected in series and/or in parallel with each other. Each unidirectionally reflecting SAW transducer unit includes first and second comb-like electrodes having a plurality of first second fingers, respectively, formed on the substrate, in which: two second fingers are interposed between each pair of adjacent two first fingers; at least one reflective stripe is provided between the two second fingers interposed between at least one pair of adjacent two first fingers; and the distances between the reflective stripe and the two second fingers and the widths of the two second fingers are determined such that acoustic waves produced by the fingers of the reflecting SAW transducer units and propagating in a first direction perpendicular to the direction of the length of the fingers and reflected by the reflective stripe in a second direction perpendicular to the first direction are in phase with acoustic waves propagating in the second direction and acoustic waves produced by the fingers of the reflecting SAW transducer units and propagating in the second direction and reflected by the reflective stripe in the first direction are out of phase with acoustic waves propagating in the first direction.
摘要翻译： SAW谐振器包括形成在压电基板上并且在声波传播方向上并置的谐振SAW传感器单元，以及设置在基片上并置的谐振SAW换能器单元的每一端的单向反射SAW换能器单元。 每个谐振SAW换能器单元包括彼此串联和/或并联连接的第一和第二SAW换能器。 每个单向反射SAW换能器单元包括分别形成在基板上的多个第一第二指状物的第一和第二梳状电极，其中：两个第二指状物插入在每对相邻的两个第一指状物之间; 在插入在至少一对相邻的两个第一指状物之间的两个第二指状物之间提供至少一个反射条纹; 并且确定反射条和两个第二指状物之间的距离和两个第二指状物的宽度，使得由反射SAW换能器单元的指状物产生的声波在垂直于第二指状物的长度方向的第一方向上传播 手指并且在与第一方向垂直的第二方向上由反射条纹反射，与在第二方向上传播的声波和由反射SAW换能器单元的指状产生的声波相同，并且在第二方向上传播并由第 在第一方向上的反射条纹与在第一方向上传播的声波不同相。
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6.发明授权Electrode material for surface acoustic wave devices and surface acoustic wave device using the same 失效表面声波装置的电极材料和使用其的声表面波装置
公开(公告)号：US4906885A
公开(公告)日：1990-03-06
申请号：US247339
申请日：1988-09-21
摘要： A surface acoustic wave device has its inter--digital transducers made of a 3--metal alloyed material consisting of aluminum, copper and magnesium.
摘要翻译： 表面声波装置具有由铝，铜和镁组成的3金属合金材料制成的数字间换能器。
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公开(公告)号：US4803449A
公开(公告)日：1989-02-07
申请号：US122325
申请日：1987-11-18
CPC分类号： H03H9/6479 , H03H9/02755 , H03H9/6443 , H03H9/6463 , H03H9/14597
摘要： This invention relates to the structure of a band-pass or band-rejection filters by combining a plurality of one-port surface acoustic wave resonators whose interdigital electrode fingers are disposed on a piezoelectric substrate. The filter combining surface acoustic wave resonators of the present invention consists of a series circuit of the one-port surface acoustic wave resonators disposed on a piezoelectric substrate for transmitting elastic surface wave and a plurality of circuit elements containing capacitance elements, and one-port surface acoustic wave resonators disposed between the electrodes of the plurality of circuit elements and the common ground. This structure can accomplish a filter having a low loss, high power handling capability and high design freedom of rejection- and passing-band.
摘要翻译： 本发明涉及通过组合多个单指示声表面波谐振器的带通或带阻滤波器的结构，其中叉形电极指配置在压电基片上。 组合本发明的表面声波谐振器的滤波器由布置在用于传播弹性表面波的压电基片上的单端口声表面波谐振器和包含电容元件的多个电路元件的串联电路和单端口表面 声波谐振器设置在多个电路元件的电极和公共地之间。 该结构可以实现具有低损耗，高功率处理能力和高排斥与通带设计自由度的滤波器。
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