Meaning
Indoor facilities designed to simulate far-field conditions within a confined space allow for the precise evaluation of antenna performance. A compact antenna test range uses a parabolic reflector to transform spherical waves into plane waves. This setup allows for the measurement of 77 ghz sensors without requiring the massive distances of a traditional outdoor range.
The boundary of the facility is defined by the anechoic chamber walls.
Reflector Mechanism
Precise machining of the metal surface ensures that the reflected wave remains coherent. In a compact antenna test range, the reflector must be larger than the antenna under test to create a quiet zone.
Measurement Fidelity
Eliminating outside interference and reflections is necessary for high-quality data. A compact antenna test range provides a controlled environment where gain and phase can be recorded with extreme accuracy. This data is used to validate the design of the antenna array before it enters mass production.
The stability of the range allows for repeatable tests across different prototypes.
Chamber Design
Absorber material on the walls prevents stray energy from returning to the sensor. The size and shape of a compact antenna test range are determined by the lowest operating frequency and the required quiet zone size.