At present, more and more attention is paid to the radiation performance of the whole machine in the RF test of mobile phones, which is ultimately reflected in the transmission and reception ability of mobile phones. At present, passive test and active test are mainly used. The passive test aims at the gain, efficiency, direction pattern and other radiation parameters of the mobile antenna. Although the influence of the overall environment on the antenna performance is considered, the final radiated transmitting power (TRP) and receiving sensitivity (TIS) after the antenna is combined with the overall device can only be evaluated through active test. It is usually carried out in a specific microwave darkroom, and the whole machine is sampled in 3D space through OTA. This test requires the linkage of two axes of the positioning device, and the test cost is high and the efficiency is low.

Directed refining

Oa-ntcx100 type source mixing reverberation chamber

In order to test the overall radiation performance of mobile phones efficiently and quickly, Rflight Communications has developed an OTA-NTCX100 source stirring reverberation chamber. The reverb room is suitable for the production line, focusing on the wireless communication test of miniaturized consumer electronic products such as mobile phones, tablets, smart watches, wireless headphones, CPE modules, drones, digital walkie talkies, smart speakers, etc., realizing multiple DUT parallel tests, using multiple sets of ultra-wideband probes to deduce TRP and TIS, ensuring the good operation of equipment communication functions.

Rflight OTA-NTCX100 source stirring reverberation chamber

OTA-NTCX100 reverberation chamber working principle

The source stirring reverberation chamber is a resonator. When the operating frequency, cavity size and boundary conditions of the reverberation chamber are unchanged, the weight of each mode in the effective mode combination can be affected by the disturbance of the excitation source, and the field distribution in the chamber will be stirred. The removal of the mechanical agitator in the chamber saves a lot of space in the reverberation chamber, increases the volume of the working area used for testing in the chamber, and improves the utilization efficiency of the chamber space.

The OA-NTCX100 uses multiple transmitting antennas. Compared with a single antenna, the advantage of multiple antennas is that in different stirring positions, there is no need to change the position of the antenna, only need to control the excitation state of the transmitting antenna through the electronic switch, you can choose to stimulate a single antenna at different times or stimulate multiple antennas at different times.

多探头布局

OTA-NTCX100 reverberation chamber features

• Consumer electronics 2G, 3G, 4G, 5G (FR1), WIFI, GPS, BT and other wireless communication test;

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• Multiple DUT parallel testing, test efficiency increased several times;

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• Ultra-wideband probe, multi-probe data acquisition and derivation of TRP, TIS, high test accuracy;

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• The data port and power line are equipped with EMI filter, supporting 700MHz-6GHz;

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• DUT can be introduced through wifi antenna or USB cable control, high degree of automation;

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• Manual or LAN remote operation for automated production lines;

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• Anti-clip safety device, drawer automatically opens in case of resistance.

OTA-NTCX100 reverberation chamber test and statistics

The dual-polarized antenna is placed in the DUT placement area, and the data of the two polarizations are collected by the vector network analyzer, and the statistics are observed in real time. It can be seen that the statistical data converges quickly, and the difference between different polarizations can be controlled within 1dB (regardless of the difference between antenna polarizations), and the whole test process can be completed within two minutes. Dozens of times more efficient than other production line test methods.

At present, the reverberation chamber has been accepted by IEC, MIL-STD-461E, RTCA DO-160E, EURO CAE ED90, 3Gpp, CTIA, ISO and other standards organizations, and is widely used in scientific research, production and other fields. Rflight Communication closely follows the development of The Times, and the joint ICT Institute has launched a reverberation chamber test system suitable for mobile communication base stations and terminals, and will be deeply applied in intelligent home appliance communication test, automobile EMC test, drone remote control distance test, satellite radiation power and stray applications, to help promote China's reverberation chamber performance optimization and technological innovation.