Abstract: A sidestepping acoustic surface wave filter device employing a 3 dB multistrip coupler between the input transducer and the offset output transducer. A reflector is located across the track associated with the input transducer in the region adjacent to the output transducer. The 3 dB coupler causes the output transducer and the reflector to receive equal acoustic surface wave energy. The reflector is designed so that the energy reflected by it is equal to the energy returned by the output transducer. Phase shifts produced in the returning acoustic surface waves by the coupler cause the returning acoustic surface waves to be suppressed in the track associated with the input transducer. Thus, triple transit signals are avoided.

Abstract: Method and apparatus for suppressing differential and common mode conducted electromagnetic interference emission in electrical equipment powered from a grounded A.C. line source without creation of a shock hazard. Differential mode interference is suppressed by connecting a capacitor across the power lines and common mode interference is suppressed by an inductor inserted in the ground lead, both positioned within the equipment case or housing. The capacitor and inductor can have substantially fixed values for a wide range of equipment. In the preferred embodiment, the inductor is constructed by winding a few turns of the ground lead itself through a high permeability, ferrite toroid positioned within the case or housing.

Abstract: An input stage for a transversal charge transfer filter, which suppresses parasitic image frequencies. It comprises two parallel channels to which the input signal is applied simultaneously. Sampling of the signal is performed in each channel with a periodicity Te, and a relative phase-shift of Te/2. The two samples are then added in order to eliminate components having periodicities in the neighborhood of Te.The present invention relates to low-pass filters using the phenomenon of electrical charge transfer occurring in a semiconductor. It relates more particularly to an input stage for this kind of CTD (Charge Transfer Device) filter, which attenuates parasitic frequencies.The design of CTD low-pass filters, often referred to as transversal filters, poses a classic problem due to the fact that the input stage is a sampling stage.

Abstract: The invention relates to hybrid filters comprising a recursive part and a non-recursive part which make it possible to synthesize the filter by splitting the desired pass-band into two. It consists in using for the design of such a filter a charge-coupled device (CCD) in which these two parts are directly linked by a simple charge transfer mechanism without any other connection.

Abstract: A surface acoustic wave filter for television or other video apparatus comprising a plurality of transducers, wherein at least one weighted transducer includes a pattern of interleaved metal fingers formed on a surface of a piezo-electric substrate, the filter including means for reducing spurious peak signals originating from within the transducer.

Abstract: Acoustic surface wave resonator structure in which coupling transducers are incorporated within reflecting arrays. Heretofore, acoustic surface wave resonator devices have included one or more interdigital transducers disposed in the resonant cavity between spaced arrays of reflectors in order to couple energy in and out of the device at resonance. The device disclosed incorporates the interdigital transducers into the reflector arrays themselves, rather than placing the transducers in the resonant cavity, thus allowing a total cavity size less than the total size of the transducers. The electrodes of the interdigital transducers incorporated into the reflector arrays are so arranged as to make these electrodes a periodic extension of the array.

Abstract: An electrical filter connector includes a housing in which a dielectric insert member is positioned. A plurality of pin contacts extend through the dielectric member in parallel-spaced alignment for engaging complimentarily positioned contacts on mating connectors. Ferrite sleeves positioned over the pin contacts coact with individual metal layers deposited on the front and rear surfaces of the dielectric block and a central metal layer within the block to form individual pi filter networks for each pin contact. Electrical connections are maintained between the pin contacts and the individual metal layers by means of solder bridges which extend over the ends of the ferrite sleeves.

Abstract: An acoustic surface wave interaction device includes a plate of dielectric material provided with two transducers each having at least one pair of comb-shaped electrode arrays having a plurality of teeth. The teeth in one comb-shaped electrode array of each pair are interleaved with the teeth of the other comb-shaped electrode array. At least one transducer has the pair of comb-shaped electrode arrays divided into two or more pairs of comb-shaped electrode arrays which are electrically connected in series, while the length of teeth is varied so that the tip ends thereof are enveloped by a curve representing the inverse Fourier transform of the transfer function of the device. The number of pairs of interleaving teeth to be included in one divided pair of electrode arrays is determined by the length of interleaving of the teeth in order to provide each divided pair of electrode arrays with the same impedance.

Abstract: A delay line for traveling wave tubes, in particular for the amplification of mm waves, has a wave guide which is provided with outward-leading transverse walls each of which has a central electron beam opening and at least one coupling opening and which form a line cell with the adjacent transverse wall. The delay line contains two portions having a different constant delay for the line wave, where the delay of the front line portion, considered in the direction of the electron beam, is lower than the delay of the rear line portion. A transition section is arranged between these two portions for matching and comprises a single matching cell in which at least one of the two transverse walls of the matching cell carries at least one matching pin which projects into the interior of the cell.

Abstract: An acoustic surface wave device having a substrate of a material capable of propagating acoustic surface wave energy. At least one electro-acoustic transducer coupled to a region of a surface of the substrate. The transducer has a first and a second bus bar positioned parallel and a distance from each other. A plurality of electrodes extend from each bus bar. The electrodes from the first bus bar are opposite to the electrodes of the second bus bar with the electrodes from one of the bus bars being forked and surrounding the electrode located in an opposite relationship thereto, thus, reducing substantially any synchronous reflections.

Abstract: This invention relates to a surface acoustic wave device which is comprised of a single domain lithium niobate layer on a multiple domain lithium niobate substrate. On the single domain layer are launching and receiving interdigitated electrode patterns. Spurious responses generated by bulk waves from the launching electrode and transmitted to the receiving electrode are substantially reduced.

Abstract: A mechanical filter including resonators, a coupler for longitudinally coupling the resonators, electro-mechanical transducers coupled to the opposite ends of the coupler, and lead wires led out from the transducers. Each of the transducers comprises a piezoelectric ceramic resonator adapted for longitudinal resonance and having electrodes attached to the opposite end faces thereof, and one of the end faces of the piezoelectric ceramic resonator is formed with a coupling hole which is located substantially on the axis thereof and extends lengthwise of the ceramic resonator. Each end of the coupler is inserted into the coupling hole with an electrically conductive adhesive to thereby couple the coupler and ceramic resonators. The aforementioned lead wires may be connected to the electrodes and wound about the piezoelectric ceramic resonators through a predetermined number of turns, and may be secured to the ceramic resonators by an adhesive having rubber-like elasticity.

Abstract: A stub-tuner for hyperfrequency coaxial line operating at high energy levels, comprising a first annular plate and a second annular plate arranged parallel to and one below the other, the plates being joined together by an outer ring and an inner ring which are respectively fixed to the outer and inner circumferences of the first and second annular plates, the rings being strips of blade-type contacts made of an elastic metallic material, means being provided for displacing the second annular plate relative to the first plate, these means comprising n push-jacks associated with a fluid-tight chamber into a fluid under pressure may be introduced, the n push-jacks so applying to the second plate a thrust directed perpendicularly thereof for pushing the second annular plate towards the first annular plate and so modifying the radius of curvature of the blade which rest under a predetermined pressure against the central and peripheral conductor walls, or push inner and outer strips of contactors, which are fixed

Abstract: A monolithic multiple magnetic layer composite comprising a substrate of a magnetic-wave-inactive material and a layer of magnetic-wave-active material deposited on each of the two opposing sides of the substrate. The composition and, consequently, the internal magnetization of each layer of magnetic-wave-active material is different from that of the other layer. The composite can be used in a magnetostatic surface wave delay line having a ground plane and means for providing a uniform bias magnetic field for the composite. Along with the geometrical parameters of the composite and the delay line, the internal magnetizations of the two layers of magnetic-wave-active material are preselected to provide a time-delay versus frequency characteristic for the delay line which is either approximately linearly dispersive or nondispersive.

Abstract: A loading coil assembly comprises a casing with an end disc at the inlet end which carries a central column extending axially in the casing. At the end of the column remote from the inlet end a support member is mounted, and a plurality of magazines, each holding a number of coils, hangs from the support member. Additional support members in the form of rings can be mounted on the column, with further magazines hanging from the rings, in one or more circles. The size of casing varies with the number of support members and rings of magazines. The casing is closed by a further end disc and filled with an expanded plastic material. A plastic material outer casing is applied over the casing.

Abstract: An electromechanical resonator, in the form of a single planar body, comprises a flexurally vibrating resonating element coupled at its midplane to a pair of torsionally vibrating couplers. Unwanted flexural modes in the resonator are substantially reduced by selecting a length-to-width ratio of the resonating element ranging between 3 and 4. A bandpass filter comprising a plurality of such electromechanical resonators may operate essentially free of spurious responses over a band of at least 200 kHz.

Abstract: Telecommunications are conveyed between sub-stations of a high-voltage electricity distribution network by high-frequency carriers using the power lines as transmission media. The filtering device attenuates high frequencies spilling over from one line section to the next. Filter elements in series with the line are high-voltage units passing high currents and are therefore expensive. Coarse-tuned high-voltage filter elements include an HF drain path to earth. Fine-tuned low-voltage filter elements at the earth end of the Hf drain path prevent wanted signals from being lost.

Abstract: A compensation network for a passive filter which compensates for the variation of the loss attenuation of the filter dependent on ambient temperature variations consists of an L-section whose series arm is formed by a temperature dependent resistor and whose shunt arm is formed by another temperature dependent resistor in series with a resonant circuit. The resonance frequency value of the resonant circuit is chosen nearly equal to the band limit frequency of the filter.

Abstract: Short connection between a hf-gigahertz transmitter and a load with rectangular input is made through an elliptical, corrugated copper tube having inductive and capacitive diaphragms in the transition zone which compensate each other and the characteristic impedance of the wave guide and of the input are at least approximately equal.

Abstract: A surface acoustic wave device embodying a novel technique of weighting the tapping amplitude of an interdigital surface acoustic wave transducer, the amplitude weights being implemented by means of planar resistors deposited so that one is connected in series with each sampling electrode of the interdigital transducer.