The tight field system is a far-field test system, but the tight field can achieve better plane wave than the far-field in a shorter distance, and have better static area performance and dynamic range. The tight field system transforms the spherical wave generated by the point source into a plane wave within the near moment away, to realise the far-field test conditions required in the test and to obtain a better quality of the background level of the darkroom by focusing the electromagnetic wave beam.
The tight field system is mainly composed of reflecting surface system, feeder system, turntable system, RF link system and antenna darkroom system.