A reverberation chamber capable of performing an EMS test having high accuracy in a wider frequency band is provided. There is provided a reverberation chamber including an electromagnetic stirrer, in which the electromagnetic stirrer includes: a first stirring blade; and a holding body disposed on a first wall face of the reverberation chamber, extending in a first direction intersecting with the first wall face, and configured to hold the first stirring blade, and the first stirring blade is electrically insulated from the first wall face.

A fixture and a measurement system are provided. The fixture is adapted for electrically connecting a measurement device with a device under test, DUT, in particular a wireless DUT, and for mechanically holding the DUT. The fixture comprises a clamp for clamping the DUT; a male plug for engaging a mating socket of the DUT; and an electrical cable connected to the plug on one end and connectable with the measurement device at its other end. The fixture is arranged to mechanically hold the DUT such that the DUT can be rotated relative to the measurement device. The fixture reduces a shielding effect in respect of antenna modules of the DUT.

A radio channel generator has a radio channel model predistorted on the basis of a predetermined chamber model. An emulator receives the weights of the radio channel model predistorted on the basis of the chamber model. A transmitter feeds a communication signal to the emulator. The emulator weights the communication signal with the radio channel model predistorted on the basis of the chamber model. The over-the-air antennas receive the weighted communication signal and transmit it to a device under test. The chamber model is based on a simulation or a measurement. The chamber model takes into account undesired interactions in the over-the-air chamber for cancelling them during the radio channel emulation.

A method and system for selectively varying the performance of a test chamber are disclosed. According to one aspect, the performance is affected by a variable absorbing structure of the test chamber. The absorbing structure enables selective exposure of absorbing material to achieve a specific performance.

The present invention discloses a test method and arrangement for testing GNSS signals within a test chamber. The test chamber inner walls are supplied with transmitting antennas supplying simulated satellite signals, originating from a signal generator. Dynamic satellite movements are simulated by interpolating several transmitted signals in order to create a single true satellite transmission signal. All visible satellites are taken into account in order to create simulated GPS signals across the whole virtual sky. Phantom objects may be used near the device under test and the phantom object may be moved or rotated in preset patterns within the test chamber. Radio channel information can be modelled according to several different real-life environments, and also reflections from any surfaces and different multipath options are taken into account in the modeling, and also in the transmission antenna angles towards the device under test. Main application areas of the invention comprise sports watches, health related or any other monitoring devices, or any devices benefiting from the positioning information, also relating to animal applications. The device may be carried or worn by the human user or any other living creature, as a wearable positioning device.

A method for emulating an electromagnetic environment, EME, in an anechoic chamber comprises the steps of: receiving, by a first receiving unit, an input signal outside the anechoic chamber; generating, by a signal generating unit, an emulated signal based on the input signal; transmitting, by a transmitting unit, the emulated signal inside the anechoic chamber to emulate the EME; receiving, by a second receiving unit, the emulated signal inside the anechoic chamber; and adjusting, by the signal generating unit, the emulated signal generated by the signal generating unit based on the emulated signal received by the second receiving unit.

An EMC test system for a rotating load includes a shielded chamber, a rotating load, a first connecting shaft, a compressor, a fluid pipeline, a fluid motor, a second connecting shaft and a motor load. The rotating load, the first connecting shaft and the compressor are arranged inside the shielded chamber. The fluid motor, the second connecting shaft and the motor load are arranged outside the shielded chamber. The rotating load is connected to the compressor through the first connecting shaft. The compressor is connected to the fluid motor through the fluid pipeline. The fluid motor is connected to the motor load through the second connecting shaft. The fluid pipeline passes through the shielded chamber. The compressor is employed such that energy is transferred to the outdoors through the transmission of fluid, and then converted into electric energy.

An electronic device may include a shaft insertable into a target area, and an electronic component configured to generate a signal. The electronic component may be on or within the shaft. The electronic device may also include at least one antenna on or within the shaft. The electronic device may also include a receiver operatively coupled to the antenna. The receiver may monitor an electrical characteristic of the antenna to identify an effect of an electromagnetic field on the electrical characteristic of the antenna. The electronic device may also include a processor communicatively coupled to the receiver. At least one of the receiver and the processor may predict an effect of the electromagnetic field on the signal generated by the electronic component, based at least in part on the effect of the electromagnetic field on the electrical characteristic of the antenna.

An RF shield for enclosing a robotic tester unit while testing mobile devices. In some embodiments, the RF shield includes at least two conductive RF shield layers separated by an insulator material. In some embodiments, an inner surface of the RF shield is further lined with a RF absorbing material to absorb EM radiation generated within the RF Shield enclosure. In some embodiments, the internal components required for testing, e.g. the robot, are powered via a power conditioner that removes from the power source frequencies above a threshold, e.g. 100 Hz, to eliminate RF signals absorbed into the power lines via radio towers and/or intentionally induced into the power lines to control power equipment.

A system and method are provided to determine equivalent isotropic radiated power (EIRP), effective isotropic sensitivity (EIS) and/or signal quality of a DUT in a test chamber, where the DUT has an AUT that has beam-forming capability and is offset from a center of a quiet zone of the test chamber. The method includes establishing a connection with the DUT using a far-field probe antenna in a far-field of the test chamber relative to the AUT so that the AUT forms a beam in a beam peak direction towards the far-field probe antenna; locking the beam of the AUT in the beam peak direction to prevent subsequent beam forming; and performing a near-field measurement of the EIRP, the EIS and/or the signal quality of the AUT with the beam locked in the beam peak direction using a near-field probe antenna in a near-field of the test chamber.