Abstract: A scanning antenna diversity system for mobile FM radio having an antenna system with controllable logic switch (2), wherein a different high-frequency reception signal (5), in terms of diversity, is passed to a receiver (3). An IF signal (9), derived from this reception signal turns on a diversity processor (4), which switches the logic switch (2) into a different switching position in response to reception interference. The diversity processor (4) has a first interference detector (6) whose momentary interference indicator signal (10) is obtained without delay from the momentary value of the IF signal (9), which is limited to the IF bandwidth, by means of determining the interference-related occurrence of impermissible momentary values of the frequency and amplitude of this signal.

Abstract: A combination antenna arrangement is provided for at least two wireless communication services, wherein a closely tolerated directional diagram is configured for the first wireless service, in a frequency range assigned to it. Antenna conductor parts are provided only for the function of the additional wireless communication services, and are radiation-coupled with the antenna assigned to the first wireless communication service. The conductor parts are divided into segments forming interruption points designed to be smaller than ⅜ &lgr; for this first wireless service. The interruption points are bridged by low-loss, frequency-dependent reactance circuits (8), in order for the combination antenna arrangement to function. These circuits possess a sufficiently high impedance in the frequency range of the first service and an impedance that is predetermined for proper functioning for the frequency range of the frequency range of the additional communication services.

Abstract: A radio antenna arrangement disposed in the conductive surface of a vehicle consisting of a substantially rectangular aperture having aperture length L and width B, wherein said aperture length L is sufficiently small so that the self-resonant frequency of the aperture is greater than the center frequency of the operating frequency range. There is a capacitive tuning element disposed in the aperture for tuning the aperture to a resonant frequency to approximately the center frequency of the operating frequency range. The capacitive tuning element serves as capacitive connection between the edges of the aperture, and is formed as a low-inductance element, so that due to the residual inductive effect, the remaining magnetic reactive power is as small as possible relative to the magnetically generated reactive power from the magnetic fields in the aperture. An input coupling element is also disposed in the aperture for coupling the antenna connection point to the resonance like high electromagnetic fields.

Abstract: A monopole antenna for use with at least two wireless communication services, having a monopole element (10) disposed along a straight line (11) and connected with a roof capacitor (1) that is designed as a flat area, the area normal line (12) pointing in the direction of the straight line (11). The roof capacitor (1) has rotational symmetry, and is formed by flat ring structures (2) that are separated from one another by ring-shaped gaps (3), the structures being oriented concentric to the straight line (11). Reactance circuits (4) connect the ring structures (2) with one another so that they are active for a wireless communication service having the lowest frequency, and the outermost ring structure (2) is essentially ineffective for the wireless communication service having the next higher frequency, because of the high impedance of the reactance circuit (4).

Abstract: The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in a frequency range above 1 GHz. The system includes an antenna arrangement which supplies the reception signal to a radio receiver. The antenna arrangement is an antenna system having several individual antennas and several antenna components, and contains a controllable logic switching device. The individual antennas and the several antenna components are positioned on the vehicle so that different reception signals are available at the antenna connection point via discrete switching positions of a controllable logic switch. A reception level testing device comparatively determines the reception level contained in the data flow in the HF-channel with an HF channel bandwidth B.

Abstract: An active broad-band reception antenna, in which the internal amplification of the active antenna is lowered if a predetermined signal level is exceeded, and which consists of a passive antenna part having output connectors that are connected with the input connectors of an amplifier circuit. The input circuit of the amplifier circuit contains a three-pole amplification element with its impedance control connector being connected with the first connector of the passive antenna part, at high frequency. The input admittance of a transformation network having the nature of a low loss filter for low amplitude, high-frequency reception signals, has a counter-coupling and linearizing effect in the high-frequency connection between the source connector of the three-pole amplification element and the second connector of the passive antenna part. The transformation network is loaded with a continuing circuit at its output.

Abstract: An antenna for mobile satellite communication disposed on a substantially horizontally oriented conductive base surface having substantially linear conductor parts and an antenna connection point. The conductor parts have a substantially vertical extension portion, substantially horizontal extension portion which, together with the conductive base surface, form a high frequency conducting ring structure. The conductor parts are disposed in a plane, mounted perpendicular to the conductive base surface, and one of the vertical or horizontal extension portions is interrupted to form the antenna connection point. In a further interruption of one of the conductor parts, is provided at least one impedance connection point wired to an impedance.

Abstract: The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in the frequency range above 1 GHz. The system includes an antenna arrangement of which the reception signal is supplied to a radio receiver. The antenna arrangement is designed as an antenna system having several individual antennas and several antenna components, and contains a controllable logic switching device. The individual antennas and the several antenna components are positioned on the vehicle so that for discrete switching positions of the controllable logic switch, reception signals that are different in terms of diversity are available at the antenna connection point. A reception level testing device is provided for the comparative determination of the reception level contained in the data flow in the HF-channel with an HF channel bandwidth B.

Abstract: A reception antenna arrangement for motor vehicles for the GHz frequency range that is formed as a combined system for the reception of circularly polarized waves and/or vertically polarized waves by a plurality of dipole antennas. Their length is not greater than ¾ of the wavelength. To form a diversity function, at least one switching or reversing device (2) is provided so that at least two signals that are different in terms of diversity and received from the dipole antennas are alternatively supplied to at least one antenna connection point for diversity reception so that one or several more favorable reception signals can be selected and provided to the antenna amplifiers.

Abstract: A scanning antenna diversity system for motor vehicles having at least two antennas mounted in a multi-antenna installation, and connected to a switching logic circuit. The circuit has discrete switching positions, and a reversing position USmax. A receiver is coupled to logic circuitry for receiving a RF signal from one of switching positions or reversing position USmax. There is a diversity processor coupled to and controlled by receiver for producing a derived received signal from the RF signal, with diversity processor cyclically stepping the logic circuitry to another switching position during the presence of receiver interference. There is a maximum level indicator having its input coupled to the antennas, and having its output connected to the controllable logic circuitry for sensing the strongest actual levels of the antenna signals. Level indicator 39 continuously compares the received signals at antennas and activates the logic switching circuit in response to any interference.

Abstract: A diversity antenna for the meter and decimeter wave ranges installed on a conductively framed dielectric surface in the body of a motor vehicle and substantially assembled from rectangular part surfaces, for example in a roof cutout or trunk with a dielectric trunk lid. A substantially wire-shaped antenna conductor is installed parallel with the conductive frame and spaced from a part thereof of the dielectric surface less than one fourth of the width of the dielectric surface. The wire-shaped antenna conductor has an interruption site which define a pair of antenna connection terminals. A two-pole, electronically controllable impedance network is incorporated in series in at least one additional interruption site.

Abstract: The invention relates to an active reception antenna comprised of a passive antenna component with a frequency-dependent effective length le. The output connections of this passive component are connected to the input connections of an amplifier circuit. The amplifier circuit consists of a field effect transistor and a low-loss filter circuit with an input admittance. The low-loss filter circuit is connected on its input to the source connection of the field effect transistor. On its output, the high-frequency reception signal is de-coupled, and the low-loss filter circuit is loaded with an effective resistance or conductance acting on its output.

Abstract: A radiotelephone system for motor vehicles, having a group antenna system with a plurality of antenna elements, and a mobile radiotelephone with a high-frequency input for receiving radio signals. The group antenna system contains controllable phase and/or amplitude adjusting elements, which are set so that a directed reception with a main receiving direction is available. The controllable phase and/or amplitude adjusting elements are controlled by a processor for tracking the main receiving direction azimuthally in the direction of a fixed station with the help of a tracking signal. Controllable switching-elements for reversing antenna signals for diversity reception are integrated in the signal paths of the group antenna system so that the azimuthal main direction of reception is tracked with a defined tracking by setting a combination of the switching positions of the controllable switching elements.

Abstract: High-frequency device to generate a plasma arc (5) for the treatment of biological tissue (1), in particular in medicine, with a high-frequency generator (3) having an internal resistor (8) and, connected thereto by means of a flexible lead (10), an electrode (4) with which the plasma arc (5) is produced in a plasma segment (6) between the electrode (4) and the biological tissue (1), which is likewise electrically connected to the high-frequency generator (3), such that in the high-frequency generator (3) a high-frequency voltage source (7) is provided to which is connected a resonant circuit (2) that comprises a first reactance element (9a) with a capacitive action and, in series therewith, a second reactance element (9a) with an inductive action, and that has a resonant frequency at the frequency of the high-frequency oscillation emitted by the high-frequency voltage source (7), wherein the voltage to generate the plasma arc (5) is derived from the first or second reactance element (9a, 9b).

Abstract: The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in a frequency range above 1 GHz. The system includes an antenna arrangement which supplies the reception signal to a radio receiver. The antenna arrangement is an antenna system having several individual antennas and several antenna components, and contains a controllable logic switching device. The individual antennas and the several antenna components are positioned on the vehicle so that different reception signals are available at the antenna connection point via discrete switching positions of a controllable logic switch. A reception level testing device comparatively determines the reception level contained in the data flow in the HF-channel with an HF channel bandwidth B.

Abstract: The invention relates to an active reception antenna comprised of a passive antenna component with a frequency-dependent effective length le. The output connections of this passive component are connected to the input connections of an amplifier circuit. The amplifier circuit consists of a field effect transistor and a low-loss filter circuit with an input admittance. The low-loss filter circuit is connected on its input to the source connection of the field effect transistor. On its output, the high-frequency reception signal is de-coupled, and the low-loss filter circuit is loaded with an effective resistance or conductance acting on its output.

Abstract: The invention relates to a diversity reception system for motor vehicles for digitally modulated terrestrial and/or satellite radio signals in the frequency range above 1 GHz. The system includes an antenna arrangement of which the reception signal is supplied to a radio receiver. The antenna arrangement is designed as an antenna system having several individual antennas and several antenna components, and contains a controllable logic switching device. The individual antennas and the several antenna components are positioned on the vehicle so that for discrete switching positions of the controllable logic switch, reception signals that are different in terms of diversity are available at the antenna connection point. A reception level testing device is provided for the comparative determination of the reception level contained in the data flow in the HF-channel with an HF channel bandwidth B.

Abstract: A diversity antenna for the meter and decimeter wave ranges installed on a conductively framed dielectric surface in the body of a motor vehicle and substantially assembled from rectangular part surfaces, for example in a roof cutout or trunk with a dielectric trunk lid. A substantially wire-shaped antenna conductor is installed parallel with the conductive frame and spaced from a part thereof of the dielectric surface less than one fourth of the width of the dielectric surface. The wire-shaped antenna conductor has an interruption site which define a pair of antenna connection terminals. A two-pole, electronically controllable impedance network is incorporated in series in at least one additional interruption site.

Abstract: An antenna for mobile satellite communication disposed on a substantially horizontally oriented conductive base surface having substantially linear conductor parts and an antenna connection point. The conductor parts have a substantially vertical extension portion, substantially horizontal extension portion which, together with the conductive base surface, form a high frequency conducting ring structure. The conductor parts are disposed in a plane, mounted perpendicular to the conductive base surface, and one of the vertical or horizontal extension portions is interrupted to form the antenna connection point. In a further interruption of one of the conductor parts, is provided at least one impedance connection point wired to an impedance.

Abstract: A scanning antenna diversity system for motor vehicles having at least two antennas disposed in a multi-antenna installation. The diversity system also contains a controllable logic circuitry, and a receiver for receiving a signal from the antennas. Connected to the receiver is a diversity processor controlled by the receiver, for stepping the logic circuitry to another switching position during the presence of reception interference. This occurs during the shortest possible comparison times, which are initiated in cyclic repetition upon expiration of a longer time interval by level comparison circuitry for detecting signals. In this case, the level comparison circuitry determines a maximum level switching position associated with the greater actual received signal in an actual receive situation. Thus, the level comparison time is selected sufficiently short so that the reception is not audibly impaired by the level comparison time.