A measurement system is provided. The measurement system comprises a device under test comprising at least two signal paths, at least two measurement antennas being spatially separated in the near-field of the device under test, and a signal analysis unit. Whereas each of the at least two signal paths of the device under test comprises an antenna and a power amplifier, noise of the power amplifiers of the at least two signal paths of the device under test is not phase-coherent. In this context, the signal analysis unit is configured to perform at least two time-coherent measurements with the aid of the at least two measurement antennas with respect to the device under test in near-field. In addition to this, the signal analysis unit is further configured to calculate at least one signal characteristic, especially error vector magnitude and/or signal-to-noise ratio, in far-field on the basis of the at least two time-coherent measurements in the near-field.

Method for evaluating electromagnetic performance of a permanent-magnet machine, wherein the method is implemented in a computer processer or in a controller of a permanent-magnet machine, calculating the magnetic field distribution by a sub-domain method; using current density of the equivalent current sheet to represent the boundary condition, iterating by the sub-do-main method and by the magnetic circuit method until a convergent result is obtained, calculating the electro-magnetic performance parameters on basis of the convergent result, so as to evaluate the electromagnetic performance.

The present disclosure provides an over-the-air measurement system for testing a device under test. The over-the-air measurement system includes an orthomode transducer (OMT) assembly having several separately formed orthomode transducer components that form at least two orthomode transducers. The orthomode transducer assembly has at least two output interfaces for feed antennas. Each of the at least two output interfaces is connected with one dedicated orthomode transducer. Two input interfaces are associated with each of the orthomode transducers. Each of the input interfaces merge into a corresponding waveguide transition that ends up in the respective orthomode transducer that is associated with the corresponding input interface. The several orthomode transducer components are stacked together linearly.

A mounting apparatus for a modular antenna is described, wherein the mounting apparatus is attachable to a plurality of different radiation apparatus or modules and/or to a plurality of different feeding apparatus or modules. The mounting apparatus has a surface facing a measurement direction, wherein the surface is configured such that a surface parameter of the mounting apparatus is smaller than a predefined threshold, wherein the surface parameter is associated with a ratio of a first projected area and a second projected area. The first projected area corresponds to an area confined by the surface of the mounting apparatus facing the measurement direction and projected onto a plane being perpendicular to the measurement direction. The second projected area corresponds to an aperture of the modular antenna projected onto the plane being perpendicular to the measurement direction. Further, a modular antenna and an over-the-air measurement system are described.

The present disclosure relates to a calibration device, a calibration setup, and a calibration method for measuring a radio frequency (RF) signal generator. The calibration device comprises an input configured to receive an RF signal of the RF signal generator, wherein the RF signal is output for the purpose of calibration and has discrete frequency lines. The calibration device further comprises a mixer configured to mix the RF signal with a first local oscillator (LO) signal and a second LO signal. The mixing may comprise a logical AND combination of the RF and LO signals, and obtains an intermediated frequency (IF) signal. The IF signal has discrete frequency lines and has a smaller bandwidth than the RF signal.

The present invention relates to a positioning apparatus for positioning a device under testDUT, the positioning apparatus comprising: a support structure extending over an horizontal plane, and a mast structure, which is elongated in shape and configured to contact the support structure, wherein the mast structure is movable along a pivoting axis between a first position, where the mast structure is perpendicular to the horizontal plane, and a second position, where the mast structure is parallel to the horizontal plane.

The present disclosure provides a vehicle auxiliary installation fixing device and a fixing method, wherein the device comprises a frame body, the frame body comprises a pair of side brackets and a pair of end brackets, the pair of side brackets are parallel to each other and both extend along a first direction, the pair of end brackets are arranged along a second direction, the end brackets are arc-shaped and connected with the ends of the same ends of the pair of side brackets, and the second direction is perpendicular to the first direction; the frame body is lined with wave-absorbing material; two groups of fixing components arranged in a first direction. The device can prevent the position of the vehicle under test from moving when the rotating bracket rotates, and avoid the problem of inaccurate test result caused by the scattering of electromagnetic waves by the device itself.

A mounting apparatus for a modular antenna is described, wherein the mounting apparatus is attachable to a plurality of different radiation apparatus or modules and/or to a plurality of different feeding apparatus or modules. The mounting apparatus has a surface facing a measurement direction, wherein the surface is configured such that a surface parameter of the mounting apparatus is smaller than a predefined threshold, wherein the surface parameter is associated with a ratio of a first projected area and a second projected area. The first projected area corresponds to an area confined by the surface of the mounting apparatus facing the measurement direction and projected onto a plane being perpendicular to the measurement direction. The second projected area corresponds to an aperture of the modular antenna projected onto the plane being perpendicular to the measurement direction. Further, a modular antenna and an over-the-air measurement system are described.

A test and/or measurement system includes a signal generator circuit, wherein the signal generator circuit includes a processing circuit. The processing circuit is configured to generate and/or process a predetermined waveform, wherein the predetermined waveform includes at least one critical portion. The processing circuit is configured to control the signal generator circuit to generate a radio frequency, RF, signal, based on the predetermined waveform, wherein the generated RF signal includes the predetermined waveform. The processing circuit is configured to adapt operational parameters of the signal generator circuit such that a signal level of the at least one critical portion of the RF signal generated fulfills at least one predefined criterion.

The present invention relates to a positioning apparatus for positioning a device under testDUT, the positioning apparatus comprising: a support structure extending over an horizontal plane, and a mast structure, which is elongated in shape and configured to contact the support structure, wherein the mast structure is movable along a pivoting axis between a first position, where the mast structure is perpendicular to the horizontal plane, and a second position, where the mast structure is parallel to the horizontal plane.