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公开(公告)号：US3887887A
公开(公告)日：1975-06-03
申请号：US42947673
申请日：1973-12-28
CPC分类号： H03H9/30 , H03H3/08 , H03H9/02622 , H03H9/02866 , Y10T29/42 , Y10T29/49005
摘要： An acoustic surface wave device and a method of constructing such a device which has much lower spurious responses resulting in improved operation. In a specific embodiment, the back surface of the surface wave device is treated by sand blasting or the like to form a plurality of depressions therein which act to randomly scatter undesired modes in the substrate thereby materially improving the device response.
摘要翻译： 一种声表面波装置和一种构造这种具有低得多的寄生响应的装置的方法，导致改进的操作。 在具体实施例中，表面波装置的后表面通过喷砂等进行处理，以在其中形成多个凹陷，其作用是随机地散布基板中的不期望的模式，从而实质地改善了装置响应。
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公开(公告)号：US3675054A
公开(公告)日：1972-07-04
申请号：US3675054D
申请日：1970-12-02
CPC分类号： H03H9/14597 , H03H9/1455
摘要： In a transducer in which a plurality of acoustic sections are cascaded in series, a plurality of electrical sections are also cascaded in series to produce a relatively long interdigitated surface wave transducer having a relatively large input impedance. In one embodiment, electrical cascading is effected so that the interconnected acoustic sections are in phase with each other. In a different embodiment the series electrical cascading produces a phase reversal between the interconnected acoustic sections.
摘要翻译： 在其中多个声学部分串联级联的换能器中，多个电部分也串联级联以产生具有相对大的输入阻抗的相对长的交叉指示的表面波换能器。 在一个实施例中，实现电级联，使得互连的声学部分彼此同相。 在不同的实施例中，串联电级联在互连的声学部分之间产生相位反转。
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公开(公告)号：US3868595A
公开(公告)日：1975-02-25
申请号：US30191872
申请日：1972-10-30
CPC分类号： H03B5/326
摘要： A surface wave oscillator having a surface wave delay line device in its oscillator circuit is taught. The surface wave delay line device is used in the oscillator to fix the frequency of oscillation and to establish a phase slope which provides optimum frequency stability for the desired frequency modulation bandwidth.
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公开(公告)号：US3859608A
公开(公告)日：1975-01-07
申请号：US42925873
申请日：1973-12-28
CPC分类号： H03H9/14505 , H03H9/02842
摘要： An improved interdigital surface wave transducer which eliminates unwanted signals due to reflections to a degree sufficient to permit its use as a television band-pass filter. The reflectionless surface wave transducer is obtained by using a modified form of unidirectional transducer in which an interdigital transducer is placed in the center of a U-shaped multi-strip coupler with the transducer phased off center by a distance Delta d so as to satisfy an equation which will result in zero reflections.
摘要翻译： 改进的叉指表面波换能器，其消除了由于反射到不足以允许其用作电视带通滤波器的程度的不需要的信号。 无反射表面波换能器通过使用单向换能器的改进形式获得，其中叉指换能器放置在U形多带耦合器的中心，其中换能器中心离开距离DELTA d，以满足 这将导致零反射。
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