Abstract: An electromagnetic wave absorber, having two or more magnetic layers for broadening the reduced reflectivity frequency bands, and formed of materials with staggered magnetic dispersion loss spectra. A high permeability nickel-zinc ferrite, rich in zinc, e.g., 0.7 molZn, 0.3 molNi is used as a reference absorber layer adjacent to a ground plane. The successively higher frequency spectra are related to the outer layers and the successively higher loss spectra are achieved by using higher magnetization soft ferro or ferrimagnetics, higher anisotropy semi-hard or hard ferro-ferrimagnetic material, or synthesized "smart" materials, for simulating magnetic loss dispersion. The successive layers are decoupled one from another by any of electrical, magnetic, and/or structural arrangements. The decoupling may be implemented by a significant difference in the frequencies at which the maximum values of the magnetic loss vs. frequency occurs for each layer.

Abstract: A four-pole or three-pole structure adapted to propagate an electromagnetic wave, such as an electrical line or cable or electronic component, comprises a lossy non-linear dielectric material distributed in a wave propagation direction. This material has a non-linear conduction characteristic whereby it is substantially non-conductive at any rated applied voltage of the structure and substantially conductive at any abnormally high applied voltage. It consists of a polycrystaline material comprising thin interstitial layers procuring a tunneling or Schottky type effect in response to a high electric field resulting from such abnormally high applied voltages. It absorbs both voltage surges (varistor effect in the time domain) and high-speed transients (lowpass filter effect in the frequency domain). The structure can be used to provide protection against lightning strikes, nuclear electromagnetic pulses, electrostatic discharges and radio-frequency interference in general.

Abstract: Absorptive tape or gasket for microwave ovens, set up in the leakage path of microwave energy, and filling at least partially such passage, consisting in an absorptive magnetic compound:where the compound consists in a powder or mixture of powders of ferrites, in an organic matrix (such as a plastic, rubber, polymer, etc.), where this or these ferrite(s) is (are) represented by the general formula MO(Fe.sub.2 O.sub.3),where M represents a bivalent metal, or mixture of bivalent metals, such as Fe, Ni, Cu, Zn, Mg, with a weight percentage of over 80%, and where this compound does present no resonance effects, i.e. presents a Q-factor substantially equal or less than unity, over the frequency range of 2,45 to over 12 GHz.

Abstract: A transmission line for the transmission of electrical energy and signals, including at least one electrical conductor exhibiting high frequency skin effect; a low conductivity magnetic composite layer surrounding the at least one conductor and exhibiting an inductance characteristic; a resistive layer coupled to the magnetic composite layer and having a predetermined capacitance relative to ground potential, the resistive layer exhibiting a longitudinal resistance characteristic matched at least to the inductance characteristic of the magnetic composite layer to obtain a correspondingly determined low pass frequency characteristic wherein within a predetermined transition frequency range, current flow switches from the at least one conductor to the resistive layer.

Abstract: A cable with at least two insulated conductors wherein the symmetrical mode electromagnetic field between the conductors is essentially confined in a low loss dielectric medium and globally surrounded at least partially by a magnetic absorptive insulating composite, attenuating the asymmetrical current mode and providing a magnetic shielding effect against outside electromagnetic interference.The electromagnetic field of the symmetrical mode is confined between the two conductors while the electromagnetic field of the common mode is absorbed in the magnetic absorptive insulating composite.

Abstract: An apparatus for controlling a device such as a motor vehicle in which a signal representing a manually controlled function is compared with a function signal, and the manually controlled signal is then modified in accordance with the function signal. The function signal is developed by analyzing human functions of the operator, environmental conditions, and vehicle conditions, etc.

Abstract: A power activation device is provided which is controlled by an electrical signal so that the effective power activation signal wave form is made independent of the control input signal wave form through the use of a precise activation threshold so that the control input signal and the power activation signal are directly correlated through the same two input terminals. The precise activation threshold is determined by threshold elements such as a zener diode and the effective control signal which is supplied from the zener diode is independent of the input signal in both shape and duration.

Abstract: An electric cable comprising a plurality of separate screenings (3, 8), immunized against external parasites, particularly of high amplitude (common mode current, EMP etc.), wherein the screenings are separated by one or more insulating or slightly conducting magnetic layers (7), formed from magnetic compositions and applied by extrusion.

Abstract: At least one conductive element combined with a magnetic absorbing mixture surrounding at least part of the conductor has a composite structure: a core is formed by a filament or fiber (rayon, nylon, glass) and a conductive coating (metal or metallic glass). There is so provided a high resistance element, with good mechanical properties and a great absorption of high frequencies.Applications: antiparasitic cables for ignition of internal combustion engines, instrumentation and low-pass cables, coaxial cables, shields and screens.

Abstract: For optimizing the manufacturing cost of the magnetic torus of a differential transformer, the volume is reduced in that the free volume of the central aperture is fully filled: only one turn for each primary conductor, the section of which is reduced, the adjacent parts of larger section forming heat sinks, the central part of the conductors having the form of circular sectors. An important saving is secured on the most expensive part of the relay.

Abstract: An electric filter includes a first conducting strip, a second conducting strip and two dielectric strips. The first and second conducting strips are rolled up together and are separated by the dielectric strips. The filter also includes a first terminal, a second terminal and a third terminal. One end or a point close to it of the first conducting strip is connected to the first terminal and the other end or a point close to it of the first conducting strip is connected to the second terminal so that at least a substantial part of the inductance of the first conducting strip due to its being rolled up is in series with the first and second terminals. The third terminal is connected to the second conducting strip.

Abstract: A speed limit system providing a passing of a given limit is disclosed. The speed-limit indicator comprises a frequency-voltage converter receiving at its input a signal which is produced by a sensor indicative of vehicle speed. A detection circuit comprising a frequency-voltage converter and a comparator followed by a gate circuit and signaling means are provided. The comparator utilizes the output of the voltage from the converter and a reference voltage which represents the speed limit. The gate circuit is interposed between the output of the comparator and the signaling means. A control signal is provided to the gate circuit, and in accordance with the state of that control signal, the gate circuit transmits or blocks the output signal of the comparator to the signaling means.