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公开(公告)号：US4281301A
公开(公告)日：1981-07-28
申请号：US74694
申请日：1979-09-12
CPC分类号： H03H9/6473 , H03H9/02779 , H03H9/6436 , H03H9/6459 , H03H9/1455
摘要： In an acoustic wave device having a pair of spaced apart reflectors forming a resonant cavity, each reflector consists of an array of parallel reflective elements. At least one of the reflectors is weighted not by simple withdrawal of reflecting elements from a nominal uniform array but instead by substituting reflective elements of the uniform array with elements providing both net-zero reflection at required positions and also at least partial compensation for the velocity perturbation which would be produced by such simple withdrawal. Such weighting may be used to suppress the side lobes of the reflector response and hence improve the stopband performance of the acoustic wave device and, for example, a coupled resonator filter in which that device is incorporated.
摘要翻译： 在具有形成谐振腔的一对间隔开的反射器的声波装置中，每个反射器由平行的反射元件阵列组成。 反射器中的至少一个不是通过从标称均匀阵列简单地撤回反射元件来加权，而是通过用在所需位置提供净零反射的元件代替均匀阵列的反射元件，并且还对速度进行至少部分补偿 这种简单撤回将产生扰动。 可以使用这种加权来抑制反射器响应的旁瓣，并且因此改善声波装置和例如其中结合有该装置的耦合谐振滤波器的阻带性能。
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公开(公告)号：US4254387A
公开(公告)日：1981-03-03
申请号：US947141
申请日：1978-09-29
CPC分类号： H03H9/6436 , H03H9/02842 , H03H9/25
摘要： An acoustic wave resonator device comprises a substrate carrying a pair of spaced apart reflectors forming a resonant cavity that supports only three adjacent distinct resonant mode frequencies. An interdigital transducer is disposed on the substrate between the reflectors and includes an array of electrodes symmetrically arranged relative to a central point of the cavity to form a plurality of electrode pairs with the electrodes of each pair equally spaced on opposite sides of the central point. The central point of the cavity coincides with a node or an anti-node of the standing wave. If the two electrodes of each electrode pair are connected to the same terminal then the transducer has zero net coupling with one set of alternate modes of the cavity, whereas if said two electrodes are connected to opposite terminals then the transducer has zero net coupling with the other set of alternate modes.
摘要翻译： 声波谐振器装置包括承载一对间隔开的反射器的基板，其形成仅支撑三个相邻的不同谐振模式频率的谐振腔。 叉指换能器设置在反射器之间的基板上，并且包括相对于腔的中心点对称地布置的电极阵列，以形成多个电极对，每对的电极在中心点的相对侧上等间隔开。 腔的中心点与驻波的节点或反节点重合。 如果每个电极对的两个电极连接到相同的端子，则换能器与空腔的一组交替模式具有零网络耦合，而如果所述两个电极连接到相对的端子，则换能器具有零网络耦合 其他一组备用模式。
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3.发明授权Acoustic surface wave filter device with asymmetric transducers and method of manufacturing same 失效具有不对称传感器的声表面波滤波器及其制造方法
公开(公告)号：US4910483A
公开(公告)日：1990-03-20
申请号：US720191
申请日：1985-04-05
申请人： Richard F. Mitchell , Paul A. Moore
发明人： Richard F. Mitchell , Paul A. Moore
CPC分类号： H03H9/1452 , H03H9/6426
摘要： In order to obtain greater flexibility in the design of a linear-phase electrical filter comprising an acoustic surface wave device including a pair of apodized transducers intercoupled by means of a multi-strip coupler, for example to obtain more equal contributions by the two transducers to the gain versus frequency characteristic of the filter, the transducers are apodized differently but have mutually complementary non-linear phase characteristics. First a transfer characteristic corresponding to the collective contribution to the desired overall gain versus frequency characteristic of the filter, is derived in terms of the z-transform and the roots or the reciprocals of the roots of the resulting polynomial in z.sup.-1 are found. These roots or reciprocals are then divided into two groups so that at least one pair of non-identical roots or reciprocals which have equal ratios between their real and imaginary parts and the product of the moduli of which is equal to unity are included one in each group. Two further polynomials are then found which have as their roots or the reciprocals of their roots those of the first group and those of the second group. The two transducers include successive active electrode pairs which have relative weights proportional to the coefficients of the successively increasing powers of the variable in one further polynomial and the variable in the other further polynomial. The active electrode pairs are connected with polarities in accordance with the signs of the corresponding coefficients.
摘要翻译： 为了在线性相电气滤波器的设计中获得更大的灵活性，该线性相电动滤波器包括声表面波装置，该声表面波装置包括通过多带耦合器相互耦合的一对变迹的换能器，例如以两个换能器获得更相等的贡献 滤波器的增益对频率特性，换能器被不同地变迹，但具有互补的非线性相位特性。 首先，根据z变换导出与对滤波器的期望的总体增益对频率特性的共同贡献相对应的传递特性，并且找到z-1中所得到的多项式的根的根或倒数。 这些根或倒数然后被分成两组，使得在它们的实部和虚部之间具有相等比率的至少一对不相同的根或倒数以及其模量等于1的乘积包括在每个 组。 然后发现另外两个多项式，它们的根或它们的根的倒数是第一组和第二组的倒数。 两个换能器包括连续的有效电极对，其具有与一个另外的多项式中的变量的连续增加的幂的系数成正比的另一个多项式的变量的比例的权重。 有源电极对根据相应系数的符号与极性连接。
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公开(公告)号：US4319222A
公开(公告)日：1982-03-09
申请号：US135962
申请日：1980-03-31
摘要： In order to form a first-come first-served queue in an information transmission system employing a common transmission channel when several transmitters of the system try to gain access to the channel when it is already occupied, without employing a further transmission channel to a point at which an account is kept of the order in which the various transmitters request access, each transmitter which tries to gain access in these circumstances is caused to delay after the channel subsequently free before it actually accesses the channel, this delay being inversely proportional to the time the corresponding transmitter has waited. Thus the transmitter which has waited the longest gains the channel first and causes the other waiting transmitters to continue to wait.
摘要翻译： 为了在采用公共传输信道的信息传输系统中形成先来先服务的队列，当系统的若干发射机已经被占用时尝试获得对该信道的接入，而不需要采用进一步的传输信道 在这种情况下，保持各种发射机请求接入的顺序的帐户，在这些情况下试图获得接入的每个发射机在其实际接入信道之后随后释放之后被延迟，该延迟与 相应的发射机等待的时间。 因此，等待最长的发射机首先增加信道，并使其他等待的发射机继续等待。
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公开(公告)号：US4065735A
公开(公告)日：1977-12-27
申请号：US648308
申请日：1976-01-12
CPC分类号： H03H9/6446
摘要： A surface acoustic wave band-pass filter comprising a piezoelectric substrate having on one surface first and second SAW resonators tuned to the same frequency and coupled together. An input transducer is coupled to the first resonator and an output transducer is coupled to the second resonator. Each resonator is preferably formed by two spaced apart aligned grating reflectors and the two resonators are preferably coupled by an array of discrete parallel metallic strips extending between the two cavity resonators.
摘要翻译： 一种表面声波带通滤波器，包括在一个表面上的第一和第二SAW谐振器被调谐到相同频率并耦合在一起的压电基片。 输入换能器耦合到第一谐振器，并且输出换能器耦合到第二谐振器。 每个谐振器优选地由两个间隔开的对准的光栅反射器形成，并且两个谐振器优选地通过在两个腔谐振器之间延伸的离散的平行金属条的阵列耦合。
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公开(公告)号：US5410342A
公开(公告)日：1995-04-25
申请号：US854637
申请日：1992-07-02
摘要： A printhead (1) for a continuous ink jet printer has a single pair of nozzles (3,3'). One or more oscillators for vibrating the ink (3,3') may be used to break up the twin streams (4,4') of droplets issuing from the nozzles. A pair (5) of charging gates is provided for applying, selectively and respectively, a charge to droplets in the two streams (4,4'). A pair of deflector means (7) apply respective electric fields across the streams (4,4') to deflect the droplets individually in accordance with the charge thereon. A gutter (10) or pair of gutters (11,11') receive droplets from the respective streams if they are not charged. The arrangement is such that the two streams of droplets are deflected in opposite directions so as to be printed.
摘要翻译： PCT No.PCT / GB90 / 02040 Sec。 371日期：1992年7月2日 102（e）日期1992年7月2日PCT 1990年12月21日PCT PCT。 公开号WO91 / 11327 日期为1991年8月8日。一种用于连续喷墨打印机的打印头（1）具有一对喷嘴（3,3'）。 用于使油墨（3,3'）振动的一个或多个振荡器可用于分离从喷嘴发出的液滴的双流（4,4'）。 提供一对（5）充电门，用于选择性地和分别地向两个流（4,4'）中的液滴施加电荷。 一对偏转器装置（7）跨越流（4,4'）施加相应的电场，以根据其上的电荷单独偏转液滴。 如果沟槽（10）或一对沟槽（11,11'）没有被充电，则从相应的流接收液滴。 这种布置使得两个液滴流在相反的方向上偏转以便被打印。
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公开(公告)号：US4204178A
公开(公告)日：1980-05-20
申请号：US892116
申请日：1978-03-31
申请人： Richard F. Mitchell
发明人： Richard F. Mitchell
CPC分类号： H03H9/6446 , H01L41/00 , H03H9/02236 , H03H9/02669 , H03H9/02779 , H03H9/64 , H03H9/6436 , H03H9/6459 , H03H9/02645
摘要： An acoustic surface wave device employs a substrate structurally orientated to enhance the propagation of acoustic surface skimming bulk waves. Multiple reflections from opposed end faces of the substrate establish an acoustic surface skimming bulk standing wave at a predetermined frequency. An interdigital transducer couples to the standing wave. A plurality of devices may be intercoupled to provide a bandpass filter.
摘要翻译： 声表面波装置采用结构上取向的基板，以增强声表面掠过体波的传播。 从衬底的相对端面的多次反射建立了以预定频率扫描体积驻波的声表面。 叉指换能器耦合到驻波。 可以将多个装置相互配合以提供带通滤波器。
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公开(公告)号：US4072915A
公开(公告)日：1978-02-07
申请号：US721967
申请日：1976-09-10
申请人： Richard F. Mitchell
发明人： Richard F. Mitchell
CPC分类号： H03H9/25 , H03H9/6446
摘要： An electrode structure within the cavity of an acoustic surface wave resonator, e.g. an interdigital transducer or a multistrip coupler, has two sections separated by an odd integral multiple of a quarter wavelength of the standing wave in the cavity and located with respect to the center of the cavity so that all the electrodes are midway between a node and an adjacent antinode of the standing wave. Distortion of the resonator response due to reflection by the electrodes of the transducer or coupler is suppressed by this arrangement.
摘要翻译： 在声表面波谐振器的腔内的电极结构，例如， 叉指式换能器或多通道耦合器具有两个部分，这些部分在空腔中与驻波的四分之一波长的奇数整数倍分开，并相对于腔的中心定位，使得所有电极都位于节点和 驻波的相邻波腹。 通过这种布置抑制由于换能器或耦合器的电极的反射引起的谐振器响应的失真。
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公开(公告)号：US4357584A
公开(公告)日：1982-11-02
申请号：US236424
申请日：1981-02-20
CPC分类号： H03H9/643 , H03H9/14552
摘要： A surface acoustic wave bandpass filter consists of input and output interdigital transducers (IP, OP) with an interposed track changing multistrip array (MSA). A conventional broadband array (MSA) is divided into two groups of strips with respect to a center of symmetry (C) separated by different distances along the input track (T1) and the output track (T2) such that the array (MSA) suppresses a predetermined frequency. If the input and output transducers (IP, OP) both have a double electrode configuration, electrode separation .lambda.o/4, providing a fundamental passband at a corresponding frequency f.sub.o and an equal amplitude passband at the third harmonic 3f.sub.o, then a separation difference of .lambda.o/6 between the groups of the array (MSA) in the two tracks (T1, T2) can suppress the third harmonic passband in the filter output. The two groups of the multistrip array may be further sub-divided to suppress more than one frequency (FIG. 5). Also a multistrip array arranged in groups to provide a shaped bandpass response may have each group divided to suppress a selected harmonic passband of the array (FIG. 6).
摘要翻译： 表面声波带通滤波器由输入和输出叉指式换能器（IP，OP）组成，具有插入的轨道更换多段阵列（MSA）。 传统的宽带阵列（MSA）相对于沿着输入轨道（T1）和输出轨道（T2）分开不同距离的对称中心（C）分成两组条带，使得阵列（MSA）抑制 预定频率。 如果输入和输出传感器（IP，OP）都具有双电极配置，电极分离λo / 4，在相应频率fo处提供基本通带，并在三次谐波3fo处提供等幅通带，则分离差 在两个轨道（T1，T2）中阵列组（MSA）之间的λo / 6可以抑制滤波器输出中的三次谐波通带。 多组阵列的两组可进一步细分以抑制多于一个频率（图5）。 同样，分组布置以提供成形带通响应的多频阵列可以将每个组划分以抑制阵列的所选谐波通带（图6）。
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公开(公告)号：US4352183A
公开(公告)日：1982-09-28
申请号：US201865
申请日：1980-10-29
CPC分类号： H04W84/08
摘要： In order to make optimum use of the available transmission channels in an information transmission system, such as a trunked mobile ratio transmission system, where a number of uncoordinated users may wish to signal to a central control point in addition to using the channels for another purpose, the central control point monitors the channels and, when a channel is or becomes free, sends a command signal on that channel. When a user who is waiting to signal receives the command signal he chooses one of a predetermined number of immediately following time slots in an effectively random manner and sends his request in that slot in digital message form. The central control point sends an acknowledgement in the next time slot if and only if it receives the request in an error-free manner. If a user does not receive such an acknowledgement in response to the transmission of such a request he tries again when he receives the next command. The channel is used for other purposes, if necessary, at times other than those occupied by a command signal plus the subsequent predetermined number of time slots. If requests from more than one user should clash in the same time slot they will not be received by the control point in an error-free manner, this being determined by means of error check bits provided in the request message.
摘要翻译： 为了最佳地利用诸如中继移动比传输系统的信息传输系统中的可用传输信道，除了将信道用于另一目的之外，多个未协调用户可能希望向中心控制点发信号 ，中央控制点监视通道，当通道为空闲时，在该通道上发送命令信号。 当等待信号的用户接收到命令信号时，他以有效的随机方式选择预定数量的紧随后续时隙中的一个，并以数字消息的形式在该时隙中发送他的请求。 当且仅当以无错误的方式接收请求时，中央控制点在下一个时隙发送确认。 如果用户响应于发送这样的请求而没有收到这样的确认，则当他接收到下一个命令时再次尝试。 如果需要，该信道用于其他目的，除了由命令信号占据的时间加上随后的预定数量的时隙之外的时间。 如果来自多个用户的请求在相同的时隙中冲突，则它们将不会以无错误的方式被控制点接收，这通过请求消息中提供的错误校验位来确定。
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