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公开(公告)号：US3596211A
公开(公告)日：1971-07-27
申请号：US3596211D
申请日：1967-11-06
Applicant: ZENITH RADIO CORP
Inventor： DIAS FLEMING , VRIES ADRIAN J DE
CPC classification number: H03H9/02842 , H03H9/14597
Abstract: Undesired time-delayed and reduced-amplitude output signal components or ''''ghosts,'''' due to reflected surface waves arriving at the output transducer of an acousto-electric surface-wave filter, are inhibited or cancelled by providing an additional transducer suitably located to reflect compensating surface waves which arrive at either the input transducer or the output transducer in appropriate amplitude and phase to nullify the effect of the undesired surface waves. The amplitude of the compensating surface waves is controlled by the configuration of the additional transducer and the magnitude of its associated external load impedance.
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公开(公告)号：US3581248A
公开(公告)日：1971-05-25
申请号：US3581248D
申请日：1969-03-26
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE , WOJCIK THOMAS J
CPC classification number: H03H9/14597 , H03H9/02574 , H03H9/02622 , H03H9/02842
Abstract: A body of piezoelectric material propagates acoustic surface waves. Coupled to a surface of the body is a first transducer that launches the waves. Spaced on the same surface from the first device is a second transducer that responds to the launched waves. In order to reduce interference from reflections and increase efficiency, an end surface of the body is selectively located with respect to the adjacent transducer and is formed to define a particular angle with respect to the wave propagating surface. With the transducer elements in the form of interleaved combs of electrodes, absorption of reflections from an end surface is increased by effectively locating the end surface a precise fraction of an acoustic wavelength from the nearest comb electrode or tooth. Moreover, the response of the combined apparatus to signals being transmitted may be altered by changing either the angle that the end surface forms with respect to the propagating surface or by changing the spacing of the end surface from the transducer. The response also may be altered by depositing a different material on the wave propagating surface.
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公开(公告)号：US3662293A
公开(公告)日：1972-05-09
申请号：US3662293D
申请日：1971-03-17
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE
CPC classification number: H03H9/02842 , H03H9/02622 , H03H9/02653
Abstract: Acoustic-surface-wave transducers are spaced apart on the surface of a wave-propagating substrate. In response to an input signal, one transducer launches surface waves toward the other which responds thereto by developing an output signal. Without more, an undesired time-delayed output signal or ''''ghost'''' may be produced by reason of surface waves reflected back to the input transducer from the output transducer. In order to inhibit the development of ghosts, a plurality of surface discontinuities, such as grooves, are formed in the wave-propagating surface alongside the output transducer. These grooves also reflect surface waves and they are spaced from the input transducer by such a distance that surface waves reflected from the grooves reach one of the transducers in a predetermined time and phase relation with respect to an acoustic surface wave reflected by the output transducer to cause cancellation so that the development of ghosts is inhibited.
Abstract translation: 声表面波换能器在波传播基板的表面上间隔开。 响应于输入信号，一个换能器通过显影输出信号向另一个发射器发射响应于其的表面波。 不用多说，由于从输出变换器反射回输入变换器的表面波，可能产生不期望的时间延迟的输出信号或“重影”。 为了抑制重影的发展，在输出变换器旁边的波传播面上形成有诸如凹槽的多个表面不连续部。 这些沟槽还反映表面波，并且它们与输入传感器间隔一定距离，使得从凹槽反射的表面波以相对于由输出换能器反射的声表面波的预定时间和相位关系到达其中一个换能器， 导致取消，使幽灵的发展受到抑制。
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公开(公告)号：US3659231A
公开(公告)日：1972-04-25
申请号：US3659231D
申请日：1971-03-17
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE
CPC classification number: H03H9/6426
Abstract: Undesired signal feed-through, due to inherent coupling between the input and output transducers of an acousto-electric surfacewave filter, is substantially attenuated by connecting two or more such filters in series and arranging the effective intertransducer spacings so that the sum of feed-through components in the different filters add to a minimum. The required effective spacings are obtained either by using different actual physical spacings of the transducer pairs in the filters, or by providing different acoustic wave propagation velocities in the different stages. In a special case wherein the system consists of three filters in series, time-delayed output signals, due to reflected surface waves, also are compensated.
Abstract translation: 由于声电表面波滤波器的输入和输出换能器之间的固有耦合，不期望的信号馈通通过串联连接两个或更多个这样的滤波器并且布置有效的换能器之间的间隔而基本衰减，使得总和 的不同过滤器中的馈通组件最小化。 通过使用滤波器中的换能器对的不同的实际物理间隔，或者通过在不同的阶段提供不同的声波传播速度来获得所需的有效间隔。 在系统由串联的三个滤波器组成的特殊情况下，由于反射的表面波而被延时的输出信号也被补偿。
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公开(公告)号：US3694676A
公开(公告)日：1972-09-26
申请号：US3694676D
申请日：1971-03-17
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE
CPC classification number: H03H9/17
Abstract: A rectangular block of piezoelectric material serves as a filter for electric signals, presenting series resonance at a selected frequency between a pair of terminals. The block has a length and height substantially greater than its thickness and is poled in the direction of the thickness. A pair of electrodes on opposing faces of the block are coupled respectively to the terminals for developing a signal field transverse to the thickness direction and, in response to which, shear waves are propagated in the block. The thickness is one-half the shear wavelength. To prevent the development of spurious wave modes, the ratio of the height to the thickness is an odd integer.
Abstract translation: 压电材料的矩形块用作电信号的滤波器，在一对端子之间以选定的频率呈现串联谐振。 该块的长度和高度基本上大于其厚度，并且在厚度方向上被极化。 块的相对面上的一对电极分别耦合到端子，用于形成横向于厚度方向的信号场，并且响应于此，剪切波在块中传播。 厚度是剪切波长的一半。 为了防止伪波模式的发展，高度与厚度之比是一个奇整数。
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Patent Agency Ranking
公开(公告)号：US3678364A
公开(公告)日：1972-07-18
申请号：US3678364D
申请日：1971-05-18
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE
CPC classification number: H03H9/64 , H03D3/16 , H03H9/1455
Abstract: An acoustic filter for use in an FM receiver includes a body of piezoelectric material propagative of acoustic surface waves, a pair of surface wave interaction devices and a diode arranged as a discriminator.
Abstract translation: 用于FM接收机的声滤波器包括传播声表面波的压电材料体，一对表面波相互作用装置和被配置为鉴别器的二极管。
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公开(公告)号：US3609602A
公开(公告)日：1971-09-28
申请号：US3609602D
申请日：1968-03-04
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE , DIAS FLEMING
CPC classification number: H03H9/02614
Abstract: A body of piezoelectric material propagates acoustic surface waves. For launching or absorbing those waves, an electrode array is coupled to a surface portion of the body. The array includes a bifilar coil comprising a pair of windings coiled over the surface. A source or load is coupled between one end of one winding and the remote end of the other winding, with the remaining ends of both windings coupled together. The spacing between adjacent turns of the windings is effectively one-half the wavelength of the acoustic waves at the operating frequency. The bifilar winding is shown either in a form where it is coiled around a cylinder or where it is nested concentrically on a surface. In one species, an input transducer launches waves in two directions around a cylinder, and an output transducer absorbs waves coming from both of the two directions. The bifilar coil contributes an inductive reactance to compensate the clamped capacitance of the transducer.
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公开(公告)号：US3600710A
公开(公告)日：1971-08-17
申请号：US3600710D
申请日：1968-08-12
Applicant: ZENITH RADIO CORP
Inventor： ADLER ROBERT , VRIES ADRIAN J DE
CPC classification number: H03H9/1455 , H03H9/14597
Abstract: A body of piezoelectric material propagates acoustic surface waves. A first surface wave interaction device is actively coupled to that surface to interact with the waves. Spaced on the same surface from the first device is a second such interaction device. The interaction devices are segmented into a plurality of interjacent arrays of electrode elements and the spacing between successive electrode elements is equal to an integral multiple of one-half wavelength at the desired operating frequency. The arrays are electrically coupled in series and are disposed to effect cumulative interaction with the surface waves.
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公开(公告)号：US3573673A
公开(公告)日：1971-04-06
申请号：US3573673D
申请日：1969-01-08
Applicant: ZENITH RADIO CORP
Inventor： VRIES ADRIAN J DE , DIAS FLEMING , WOJCIK THOMAS J
CPC classification number: H03H9/0038 , H03H9/0042 , H03H9/02622 , H03H9/02685 , H03H9/02842 , H03H9/02866 , H03H9/02874 , H03H9/64
Abstract: A body of piezoelectric material is capable of propagating acoustic surface waves and a first transducing device is coupled to a surface of the body to develop those waves. Spaced on the same surface from that first device is a second transducing device. The spacing is sufficiently small that crosstalk exists between the devices. To reduce the magnitude of that crosstalk, one or more of several different decoupling arrangements are included. These comprise the connection of diametrically opposite transducer electrodes to a common plane of reference potential, the connection of the mutually closest electrodes of the respective transducers to a plane of common reference potential, the disposition of one or more ground electrodes between the transducers and across the path of wave propagation, the development across the transducers of signals balanced with respect to such a plane, the physical shielding of the space generally above one of the transducers, the inclusion of a conductive shield on the surface opposite the wave-propagating surface and the formation of shielding channels in that surface opposite the wave-propagating surface. In addition, the wave propagation path advantageously is caused to be oriented at an angle relative to the end surfaces of the piezoelectric body in order to minimize reflected wave interference.
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10.发明授权Acousto-electric filter utilizing surface wave propagation in which the center frequency is determined by a conductivity pattern resulting from an optical image 失效ACOUSTO-ELECTRIC过滤器利用表面波传播，其中心频率由光学图像导致的电导率图形决定
公开(公告)号：US3446975A
公开(公告)日：1969-05-27
申请号：US3446975D
申请日：1966-11-07
Applicant: ZENITH RADIO CORP
Inventor： ADLER ROBERT , VRIES ADRIAN J DE
CPC classification number: H03H9/6403 , H03H9/02968
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