Abstract: A thin-film integrated circuit with tank circuit characteristics may comprise a surface acoustic wave transducer with appropriate geometry. A preferred embodiment of such integrated circuit includes, in addition to the surface acoustic wave transducer, surface acoustic wave reflecting means located adjacent the transducer, and preferably on opposite sides thereof. The reflecting means may include a pair of reflectors and be proportioned so that the device exhibits a single resonant-anti-resonant frequency pair, such as a single tank circuit. Alternatively, the reflectors may be proportioned such that the device exhibits multiple resonant-anti-resonant frequency pairs. The operating frequency may be as high as hundreds of megahertz to one gigahertz.Applications of the thin-film integrated circuit to thin-film filters and oscillators are also disclosed.

Abstract: A variable delay device for delaying an electrical signal includes a bar-shaped magnetostrictive member to be a transmitting path of a supersonic wave, an input transducer for converting an electric signal into a supersonic wave and an output transducer for converting a supersonic wave into an electric signal, the input and output transducers being provided at at opposite end portions of the magnetostrictive member, and a magnetic field producing device provided between the input and output transducers for supplying the magnetostrictive member with a magnetic field which varies in intensity along the elongated direction of the magnetostrictive member. The magnetic field supplied to the magnetostrictive member is controlled by a control signal applied to the magnetic field producing device to vary the Young's modulus of the magnetostrictive member. As a result, the velocity of the supersonic wave being transmitted therein is varied, to thereby control the delay time of the electric signal.

Abstract: A wound multi-capacitor filter for suppressing R.F. interference signals on power lines is formed by winding into a roll a floating sheet electrode that is sandwiched between two dielectric layers, a pair of spaced equal area sheet electrodes and another electrode being in contact with the outer surfaces of the sandwiching dielectric layers. The pair of electrodes are connected to two power lines that deliver energy to a device such as a motor, while the other electrode is connected to a grounded terminal. This filter provides either a reduction in AC leakage or an improvement in noise attenuation or both compared to a conventional delta-connected filter.

Abstract: An improved monolithic crystal filter arrangement is disclosed wherein a monolithic crystal filter device is formed on a wafer of quartz crystal, or other piezoelectric material, with two pairs of electrodes thereon, each pair cooperating with the wafer to form a resonating portion. Each pair of electrodes include an active electrode, i.e., input or output, and a ground electrode. The input and output electrodes are formed end-wise on alternate sides of the crystal wafer with the ground electrodes, likewise on alternate wafer sides, positioned along an axis perpendicular to that of the active electrodes and in a location so that at least a portion of each thereof extend into the gap between the in-board ends of the active electrodes.

Abstract: In illustrated embodiments, at least one analogue shift register has a number of parallel inputs and one series output. A number of individual evaluating circuits receive the signal to be filtered and supply respective output quantities of charge equal to the product of the difference between the relevant signal value and a predetermined minimum or maximum value, and a respective individual evaluation factor. The output of each evaluating circuit can be connected via a switching element to an associated parallel input. The capacity of every storage position of the shift register is at least such that it is always able to accommodate the maximum quantity of charge supplied by the preceding storage position, and when the storage position has a parallel input, can additionally accommodate the maximum quantities of charge supplied by the associated evaluating circuit (s). Various modifications are disclosed for reducing the space requirement of a transversal filter when implemented, for example, as a CCD.

Abstract: An electromechanical filter comprising resonators interconnected by couplers and at least one bridge strapping over several resonators in which said resonators are longitudinally vibrating, said couplers and bridge are bending and the number of strapped resonators is a multiple of four. Such a filter shows improved phase characteristic within the pass band.

Abstract: Input and output waveguides are each formed from an inner tubular conductor coaxially disposed within an outer tubular conductor. The proximal ends of the waveguides are coupled through relatively rotatable sleeves of a coupling assembly that maintains the waveguides coaxial with a central axis. The field strength of a wave at the distal end of the input waveguide defines two cycles of a sinusoid about the axis. The inner conductors each carry on their outer surface an equal number of evenly spaced ridges. The ridges in the input waveguide cause the field strength to be invariant at the proximal ends. The ridges in the output waveguide cause the field strength to define the two cycles of the sinusoid at the distal end of the output waveguide.

Abstract: A tapped delay line transversal filter utilizing both surface acoustic wave and charge coupled device technologies, the surface acoustic wave tapped delay line portion providing a coarse selection and the charge coupled device tapped delay line portion providing vernier weighting.

Abstract: An elastic surface wave device comprises an X-cut LiTaO.sub.3 substrate whose thickness satisfies the expression ##STR1## WHERE N: 1, 3, 5 . . . (ODD NUMBER)F.sub.l : a minimum frequency (MHz) of a filter pass bandF.sub.u : a maximum frequency (MHz) of a filter pass bandD: a thickness (mm) of the LiTaO.sub.3 substrate and transducers provided on one surface of the substrate.

Abstract: Applicants discovered that by employing selected transducer geometries, such as unbalanced dual-finger geometries, certain reflections, called "Mechanical electrical loaded" (MEL) reflections, can be generated which tend to cancel reflected waves inherently generated by surface acoustic wave devices.In particular, the disclosure is directed to a transducer for a surface acoustic wave device adapted for coupling to an electrical load and/or source. A pair of interdigitated comb electrodes are formed on an acoustic wave propagating substrate, for example a piezoelectric substrate. Means, such as input or output terminals, are provided for applying an electrical load and/or source across the pair of comb electrodes. Each of the comb electrodes has a plurality of interdigitated electrode fingers.

Abstract: Applicants have discovered that the performance of Surface Acoustic Wave Resonators can be markedly improved by digressing from the accepted techniques of sensing standing waves set up by resonation in the SAW device. Applicants have developed a SAW resonator which employs one or more unidirectional transducers which are sensitive to traveling rather than standing waves. This construction obviates the deletevious action of direct, broad band, input to output coupling and avoids the high position sensitivity which occurs when bidirectional transducers are utilized to sense standing wave patterns.

Abstract: Two groups of conductors are wound helically with opposite pitch around a core and are further intertwined to establish a mesh, braid or plait. The conductors of each group are interconnected to establish the signal line and the return path for the delay line.

Abstract: Apparatus for extracting the fundamental frequency from a complex audio wave form and for producing a pulse representation of said fundamental frequency includes a low pass filter having a frequency response characteristic which tends to exclude harmonics together with a control circuit including amplifier means, peak detector means and voltage to current converter means for supplying a control signal to the low pass filter thereby to vary the cutoff frequency of the filter and to maintain substantially constant amplitude of the fundmental wave form together with voltage comparator means for comparing the peaks of an alternating current quantity dependent upon the output of said filter with a direct current quantity proportional to the output of the filter, said comparator means thereby producing a pulse per cycle of said fundamental frequency.

Abstract: This specification describes a charge-transfer device transversal filter chip in which an input signal is fed in parallel into a number of channels the outputs of which are summed together to provide the desired transversal filter transfer function. Each channel contains an analog shift register, a signal splitter and a polarity selector. The shift registers are of unequal length to provide a different delay thru each channel. The signal splitter provides a plurality of signal paths thru each channel while the polarity selector determines whether a given path in a given channel is added or subtracted in the summation to determine the gain of the given channel in the summation.

Abstract: The invention involves in-phase power splitting from an input into separate pairs of paralleled input variable circuits which may be linear amplifiers or linear controlled attenuators. The outputs of these circuits feed the input branches of a pair of 180.degree. hybrid circuits, the outputs of those hybrids providing the inputs of a 3 db quadrature coupler. An output of this coupler then provides the overall output which is shifted in phase with respect to the original input as a function of the gain control signal applied differentially between the variable circuits of the aforementioned pairs as the cosine of the desired phase angle in respect to the first pair of circuits and in accordance with the sine of the desired phase angle at the control terminals of the second pair of circuits.

Abstract: Circuit components such as frequency filters, impedance transformers, and time delay elements are fabricated into an assembly which is electrically and mechanically coupled to the center conductor. A seamless dielectric material is telescoped over the assembly and then the assembly is telescoped into a seamless outer jacket of conductive material. Then the ID of the outer jacket is reduced into contact with the dielectric material surrounding said assembly and center conductor by drawing said jacket through a die.

Abstract: A system of shaping, mounting, and interconnecting Radio Frequency Coaxial cable transformers on a printed wiring board to minimize inductance of the interconnections for use at very high and ultra high frequencies.

Abstract: A delay-line has two essentially identical distributed parameter delay-line sections that have series connected solenoidal coils and mutually parallel axes. The winding directions of the two coils are such that an external observer traveling along the series connected coils from one free coil-end to the other will observe a winding direction reversal in going from one section to the other. Thus a uniform unidirectional magnetic field having a component parallel to the section axes will produce induced voltages in the two coils that are of opposite polarity and no net induced voltage will appear between the free ends of the series connected coils.

Abstract: An acoustic surface wave device wherein an interdigital transducer is provided which includes interdigitated electrodes of narrow width and fine spacing extending from parallel bus bars. Means are provided electrically to interconnect members of a set of electrodes at a location spaced from the bus bar from which they extend to provide multiple current paths between the bus bar and metallization elements forming the electrodes. In one embodiment, apodized electrodes are interconnected adjacent ends of electrodes of the opposite set. In split electrode transducers, the electrodes of each pair are also interconnected at the ends opposite the associated bus bar.

Abstract: The invention relates to transducer electrodes for filters or delay lines using surface wave principles on piezoelectric substrates wherein parallel mounted electrodes have interdigital fingers extending toward the electrodes and wherein feeders for the fingers have widths of one half the wave length of the surface wave at the mean filter frequency so as to equalize and eliminate reflections in the device.