name: CATR
full_form: Compact Antenna Test Range
context: The CATR system does not require a measurement distance of to achieve a plane wave as in a standard far field range. For the CATR system, the far-field distance is seen as the focal length. The focal length is the distance between the feed and the reflector of the CATR. Further information on the focal length of a CATR system can be found in clause 5.2.3.2 of TR 38.810 [24]. The measurement distance for any CATR system implementation shall be adequate to meet the quiet zone dimensions defined in B.2.4.2. In a CATR, from the reflector to the quiet zone, there is a plane wave with no free space path loss. For CATR, free space path loss is calculated by applying the Free Space Loss formula with R equal to the far field distance based on the focal length: . A summary of the comparison of path losses which can be expected for the CATR compared to a Fraunhofer limit distance () for different antenna sizes and frequencies can be found in clause 5.2.3.2 of TR 38.810 [24]. The influence of
description: Compact Antenna Test Range (CATR) is a system used for measuring the radiation patterns and other characteristics of antennas in a controlled environment. It simulates far-field conditions without requiring large distances, allowing for precise and efficient antenna testing.
explanation: CATR is classified as Testing Equipment because its primary function is to evaluate and characterize the performance of antennas, a crucial component in telecommunications systems.
section_title: B.2.4.4Measurement Distance
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