Abstract: A portable anechoic chamber for testing a device under test, comprises a number of test antennas, each test antenna having at least one polarization, an antenna positioning means for positioning at least one of the test antennas in elevation direction relative to the device under test, and a device positioning means for positioning the device under test in azimuth direction.

Abstract: A test system is used for testing multiple input multiple output capabilities. The system comprises a device under test, a movable antenna and a signal simulation unit. Furthermore, the signal simulation unit simulates at least two multiple input multiple output channels in order to test the multiple input multiple output capabilities of the device under test.

Abstract: A calibration system for calibrating an antenna array comprising antenna elements comprises a measuring unit, and a calibration antenna connected to the measuring unit. The measuring unit sequentially excites each antenna element of the antenna array with an input signal and receives the corresponding output signal through the calibration antenna. Furthermore, the measuring unit measures a transfer function of each antenna element of the antenna array.

Abstract: A system for testing and/or calibrating an antenna array. The system comprises a device under test comprising the antenna array and at least one active radio frequency device for transmitting a test signal being known and always the same on each of at least two signal paths, and a measurement device comprising at least one probe for receiving the test signal on each of the at least two signal paths. The test signal is a non-repeatable one.

Abstract: A measuring system for calibrating an antenna array is provided. A parameter setting unit modifies an input signal of a first antenna or a first antenna group, using operating parameters. A signal generator generates a first measuring signal and provides it to the parameter setting unit and to a second antenna or a second antenna group of the antenna array. A measuring antenna receives a second measuring signal composed of a signal emitted by the first antenna or first antenna group and a signal emitted by the second antenna or second antenna group. A power meter measures the power of the second measuring signal. An evaluation device determines a measured interference signal from the measured power of the second measuring signal, and preferably also determines the operating parameters used by the parameter setting unit based upon the measured interference signal and position information.

Abstract: A test arrangement for wirelessly testing a device under test comprises a test antenna for receiving wireless signals from the device under test, a movable test antenna carrier that carries the test antenna and is movable to adjust the distance between the test antenna and the device under test, a transformation processor that is coupled to the test antenna and performs a near-field to far-field transformation based on the wireless signals received from the device under test and outputs respective transformed signals, and a signal processor that is coupled to the transformation processor and calculates a minimum far-field distance for the device under test based on the transformed signals, wherein the signal processor evaluates if the distance between the test antenna and the device under test is equal to or larger than the calculated minimum far-field distance.

Abstract: A test device for a wireless communication device comprises a device support that accommodates the wireless communication device, a movable position determination device, a number of wireless probes for communicating with the wireless communication device, and a mechanical probe support, wherein the wireless probes are mechanically coupled to the probe support and the probe support is mechanically coupled to the position determination device.

Abstract: A measuring device for direction finding of an electromagnetic signal includes an antenna-element for receiving the electromagnetic signal and processing means for determining the direction of the electromagnetic signal and displaying the direction of the electromagnetic signal. The processing means further include direction uncertainty determination means (322) for determining a direction uncertainty angle of the direction of the electromagnetic signal. The processing means are set up for displaying the direction uncertainty angle on display means.

Abstract: A test system for testing a device under test is described, which comprises an antenna array having a plurality of antenna elements and an adjustment unit having a Fresnel structure. The adjustment unit is placed between the antenna array and the device under test. Further, a method for testing a device under test is described.

Abstract: A system for testing and/or calibrating an antenna array. The system comprises a device under test comprising the antenna array and at least one active radio frequency device for transmitting a test signal being known and always the same on each of at least two signal paths, and a measurement device comprising at least one probe for receiving the test signal on each of the at least two signal paths. The test signal is a non-repeatable one.

Abstract: An antenna array is described which comprises a plurality of antenna elements. Said antenna elements are grouped in at least two antenna groups. Said antenna elements of each antenna group emit coherent signals. Said antenna groups are arranged symmetrically to a central point of said antenna array. Further, a method for testing a device under test and a test system are described.

Abstract: An antenna array for at least one of generating and receiving a plane wave in a certain distance is described, the antenna array comprising a plurality of antennas which are movable with respect to each other. The antenna array is configured such that plane waves are at least one of generated and received in the near field of the antenna array. Further, a test system and a method for testing a device under test are described.

Abstract: The present application is related to a method for detection of a signal, the method comprising the steps of performing continuously a direction finding in time-frequency intervals within a time range and a frequency range, determining for each frequency interval a distribution of the direction finding results, DFRs, for all time intervals and evaluating the determined distribution of direction finding results, DFRs, to detect the existence of a signal emitted by a signal source.

Abstract: A test arrangement for testing a device under test comprises a rotatable device support for carrying the device under test at least rotatable in one axis, a first test antenna and a second test antenna, a first antenna positioning means for moving the first test antenna relative to the device under test in elevation direction, and a second antenna positioning means for moving the second test antenna relative to the device under test in azimuth direction and elevation direction.

Abstract: A system for determining the radiation pattern of an antenna array comprising a plurality of antenna elements comprises a signal generator for generating a test signal, a number of probes for measuring a magnitude of the signals emitted by the antenna elements when driven with the test signal in a first surface and in a second surface, wherein the distance of the first surface to the antenna elements is smaller than the distance of the second surface to the antenna elements, and a pattern calculation unit for calculating the radiation pattern of the antenna array based on the magnitudes measured in the first surface and the second surface.

Abstract: A calibration system for calibrating an antenna array comprising a plurality of antenna elements comprises a signal generator for generating a predetermined test signal and, the signal generator being couplable to the antenna elements for providing the test signal to the antenna elements, a number of probes for measuring at least one physical parameter, which is influenced by emissions of the antenna elements, and providing respective measurement signals, and a position determination unit for determining based on the measurement signals the positions of the antenna elements as calibrated positions.

Abstract: A calibration system for calibrating a radio frequency, RF, device comprising a plurality of signal paths, each signal path comprising at least an amplifier and an antenna element, comprises a measurement system for driving the signal paths with a predetermined test signal and measuring an output of the signal paths in response to the test signal, a determination module for determining a first signal path, of which the antenna element provides the lowest output of all antenna elements, and a correction factor calculator for calculating based on output of the first signal path a correction factor for the further signal paths such that with the applied correction factor the output of all signal paths is equal within a predetermined acceptance interval.

Abstract: A calibration system for calibrating a radio frequency, RF, device comprising a plurality of signal paths, each signal path comprising at least an amplifier and an antenna element, comprises a signal generator for driving the signal paths with a predetermined test signal, at least two probes for measuring the output of the signal paths in reaction to the test signal, and a correction factor calculator for calculating respective correction factors based on differences in at least one characteristic of the measured outputs of the signal paths.

Abstract: A method for testing a multiple-input and multiple-output device is described, said device comprising at least two receiving antennas. A first test signal is transmitted via a first transmission antenna. The first test signal is measured via each receiving antenna of said device. At least a second test signal is transmitted via a second transmission antenna. The second test signal is measured via each receiving antenna of said device. Further transmitting signals are transmitted via the transmission antennas in pairs wherein a phase difference is set between the phases of said transmitting signals transmitted via the pair of transmission antennas. Measuring the further transmitting signals via each receiving antenna of said device. A channel matrix of said device is determined. Furthermore, a test system is described.

Abstract: A measuring device comprises a processing unit, a first antenna adapted to receive a first signal, and a second antenna, adapted to receive a second signal. The processing unit comprises a baseline unit adapted to determine a baseline variance of a first variable and/or a second variable. Moreover, it comprises a variance unit adapted to determine a variance of the first variable and/or the second variable. The first variable and the second variable are each at least initially derived from at least the first signal and the second signal. The processing unit furthermore comprises an error unit, adapted to determine if a systematic error is present, based on the baseline variance and the variance of the first variable and/or the second variable.