Abstract: In a first embodiment, the invention relates to an arrangement for operating a plurality of terminal devices (6) on a common antenna (4) with a coupling network (2) comprising a first separator (8) associated with the antenna (4) and a second separator (10) associated with the respective terminal (6). In a second embodiment, the invention relates to an arrangement for operating a plurality of terminal devices (6) on a common transmitting antenna (4?) and on a common receiving antenna (4) which is separate from the common transmitting antenna (4?) with a coupling network (2) comprising a separator (10) which is associated with the respective terminal.

Abstract: A multi-targeting method for locating short-range target objects in terms of distance and angle. The method includes the following steps: a) a characteristic signal is emitted by a transmitting antenna of a first sensor element; b) the reflected characteristic signal is received by at least two adjacent reception antennae of the first sensor element; c) the difference in transit time of the reflected characteristic signal to the two adjacent reception antenna of the first sensor element is measured in order to determine the distance between the target objects and the first sensor element; and d) the phase differences of the characteristic signal between the two adjacent reception antenna of the first sensor element are measured in order to determine the angles between the target objects and the first sensor element. In addition, a device for implementing the above-mentioned method.

Abstract: In order to improve the signal-to-noise ratio for broadcast radio reception in a vehicle, the invention provides an arrangement (1) for digital reception of a signal (S), in particular of a broadcast radio signal, having two or more antennas (2) each of which has an associated receiver element (4), with the receiver elements (4) being connected via a data bus (6) to a central control unit (8) for synchronization and superimposition of antenna signals (S) which are emitted from the antennas (4).

Abstract: In a first embodiment, the invention relates to an arrangement for operating a plurality of terminal devices (6) on a common antenna (4) with a coupling network (2) comprising a first separator (8) associated with the antenna (4) and a second separator (10) associated with the respective terminal (6). In a second embodiment, the invention relates to an arrangement for operating a plurality of terminal devices (6) on a common transmitting antenna (4″) and on a common receiving antenna (4) which is separate from the common transmitting antenna (4″) with a coupling network (2) comprising a separator (10) which is associated with the respective terminal.

Abstract: A method of receiving data signals having identical contents and different frequencies. The frequency position of the data signals is analyzed by means of an FFT, and the signals are down-converted to the same intermediate frequency. The frequencies are selected such that the partial waves are constructively superpositioned, thereby improving the signal-noise ratio in the sum.

Abstract: A method for analog-to-digital conversion of an analog signal includes decomposing the signal in the time domain into intervals, and transforming these intervals one after another using orthogonal functions, the coefficients corresponding to the orthogonal functions being defined and digitized. The transformed signal is then inversely transformed in the digital domain using the digitized coefficients and the same or different orthogonal functions. A high level of performance with respect to bandwidth and resolution may be achieved.

Abstract: A method for digital-to-analog conversion of a digital signal (xd(ti)) comprises resolving the signal (xd(ti)) in the time region into intervals and successively transforming these intervals on the basis of orthogonal functions (gjd(t)). Coefficients (ajd) associated with the orthogonal functions (gjd(t)) are determined and converted from digital to analog and the signal (xa(t)) is transformed back in the analog region on the basis of analog coefficients (aj), which result therefrom, by means of orthogonal functions (hj(t)).

Abstract: A method for digital-to-analog conversion of a digital signal (xd(ti)) comprises resolving the signal (xd(ti)) in the time region into intervals and successively transforming these intervals on the basis of orthogonal functions (gjd(t)). Coefficients (ajd) associated with the orthogonal functions (gjd(t)) are determined and converted from digital to analog and the signal (xa(t)) is transformed back in the analog region on the basis of analog coefficients (aj), which result therefrom, by means of orthogonal functions (hj(t)).

Abstract: A method for analog-to-digital conversion of an analog signal includes decomposing the signal in the time domain into intervals, and transforming these intervals one after another using orthogonal functions, the coefficients corresponding to the orthogonal functions being defined and digitized. The transformed signal is then inversely transformed in the digital domain using the digitized coefficients and the same or different orthogonal functions. A high level of performance with respect to bandwidth and resolution may be achieved.

Abstract: A silicon-germanium heterobipolar transistor has a silicon emitter 1, a silicon-germanium base 2 and a silicon collector 3 such that, starting from the emitter 1, the base 2 includes a change in the Ge content in the form of a step-wise increase, and a likewise step-wise, but opposing, change in the doping concentration, with a step height that is larger, seen in terms of energy, than the energy of the optical phonon energy of the semiconductor material.

Abstract: An active receiving antenna for vehicles, including a slot-shaped antenna cut into the metallic vehicle body, and having small-depth cavity filled with a dielectric material which closes off the antenna toward the back or interior of the vehicle. A low-noise preamplifier, which is integrated into the dielectric material, is connected to the antenna via two feed lines of different length. The desired polarizations of the received signals are set via this preamplifier, which can be changed over and be switched off.

Abstract: A transmit-receive switch which can be integrated. The receive diplexer of the switch comprises a parallel resonant circuit which can be completed or connected into the switch via a heterobipolar transistor. The transmit diplexer includes a series resonant circuit or a parallel resonant circuit which is connected into the switch circuit via a further heterobipolar transistor. Each of the heterobipolar transistors is rendered conductive or non-conductive via the applied HF power. That is, a high HF power, as is present in the transmission case, causes the respective transistor to become conductive and via the respective resonant circuits, cause the receive diplexer to become high impedance and block any signal, and cause the transmit diplexer to become low impedance and pass the high HF power substantially undampened.

Abstract: A method for manufacturing semiconductor components contactable on both sides, in particular IMPATT diodes. The active silicon layers of the IMPATT diode are grown onto a silicon substrate. The first silicon layer grown onto the silicon substrate has a high boron/germanium doping level and acts as an etch atop layer when the substrate is removed. The boron/germanium doping of the first silicon layer compensates for the mechanical stress in the silicon layer generated by the boron doping.

Abstract: An IMPATT diode having Si-SiGe heterostructure grown on a Si substrate with the SiGe layer being disposed in the generation zone of the IMPATT diode. The SiGe layer may be replaced by a Si/SiGe superlattice.