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112 条记录 (耗时 0.017 秒)

    Acoustic bulk mode suppressor
    91.
    发明授权
    Acoustic bulk mode suppressor 失效
    声学体模抑制器

    公开(公告)号：US3887887A

    公开(公告)日：1975-06-03

    申请号：US42947673

    申请日：1973-12-28

    申请人： TEXAS INSTRUMENTS INC

    发明人： WAGERS ROGERT S ,  BIRCH MICHAEL J ,  HARTMANN CLINTON S ,  WEIRAUCH DONALD F

    IPC分类号： H03H3/08 ,  H03H9/00 ,  H03H9/02 ,  H03H9/30 ,  H03H9/26 ,  H03H9/32

    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。

    Microwave acoustic delay line
    92.
    发明授权
    Microwave acoustic delay line 失效
    MICROWAVE声音延迟线

    公开(公告)号：US3857113A

    公开(公告)日：1974-12-24

    申请号：US43796874

    申请日：1974-01-30

    申请人： RCA CORP

    发明人： HUANG H

    IPC分类号： H03H9/30 ,  H03H7/30 ,  H01P1/10 ,  H01P1/32

    CPC分类号： H03H9/30

    摘要： A microwave signal is delayed for a predetermined time period with a minimal production of undesired spurious RF signals by providing a resistive termination for undelayed input microwave signals reflected by an acoustic delay means and an output conductive path from the input microwave signals delayed by the acoustic delay means.

    Apparatus for providing time-delay frequency selectivity and/or switching of wave energy
    93.
    发明授权
    Apparatus for providing time-delay frequency selectivity and/or switching of wave energy 失效
    提供时间延迟选择性和/或开关波能量的装置

    公开(公告)号：US3609596A

    公开(公告)日：1971-09-28

    申请号：US3609596D

    申请日：1968-06-27

    申请人： MASSACHUSETTS INST TECHNOLOGY

    发明人： MORGENTHALER FREDERIC R

    IPC分类号： C04B35/26 ,  H01F10/24 ,  H01P1/215 ,  H03F13/00 ,  H03H9/30 ,  H03H9/38 ,  H01P5/12

    CPC分类号： H01F10/245 ,  C04B35/2675 ,  H01P1/215 ,  H03F13/00 ,  H03H9/30 ,  H03H9/38

    摘要： Apparatus for providing time delay, frequency selectivity and/or switching of electromagnetic wave energy, that includes, a single- or multilayer magnetic material adapted, when magnetized, to convert electromagnetic wave energy in air, for example, to spin wave energy in the material, the electromagnetic wave energy being subjected to an abrupt discontinuity in the equilibrium environmental parameters to effect such conversion. The electromagnetic wave is converted within the material to a combination of evanescent and propagating spin waves. By controlling the abruptness of said discontinuity, it is possible, as discussed herein, to control the rate of decay ( Alpha ) of the evanescent wave and the wave number (k) of the spin wave thereby to control the rate of conversion and determine, further, the wavenumber of the spin wave. It has been found, for present purposes, that when Alpha k, the group velocity of the spin wave is minimum, thus making possible the use of thin films to provide substantial delay. There is also described apparatus and method in which the power within the material can be directed at some angle to the direction of the incoming wave to provide some time delay but, more importantly, to provide switching and/or filtration of an input signal; the latter apparatus and method do not ordinarily relate to thin film although thin film may be used. Further, operation is generally in the region of Alpha >>k.

    Active impedance matching of microwave acoustic devices
    94.
    发明授权
    Active impedance matching of microwave acoustic devices 失效
    微波声学器件的主动阻抗匹配

    公开(公告)号：US3594593A

    公开(公告)日：1971-07-20

    申请号：US3594593D

    申请日：1969-05-02

    申请人： STANFORD RESEARCH INST

    发明人： HO RAYMOND Y-C ,  BAHR ALFRED J

    IPC分类号： H03H9/30 ,  H03H11/28 ,  H03H7/38

    CPC分类号： H03H11/28 ,  H03H9/30

    摘要： The impedance of delay lines (particularly acoustic delay lines) is matched to the microwave source utilizing active networks synthesized from inverted common collector transistor circuits. The active inductance and negative resistance generated by the inverted common collector transistor circuits are connected across input terminals of the delay line and matching is improved by connecting an active negative resistance in series between source input terminal and a delay line input terminal.