Antenna Measurement on Cylindrical Surface in Fresnel Region Using Direct Far‐Field Measurement System

The small anechoic chambers built by many small‐/medium‐sized companies and universities present difficulties in testing electrically large antennas because the chamber size cannot satisfy the far‐field criterion of large antennas. In this paper, a method for Fresnel‐region measurement on a cylindrical surface with variation of the measurement height is proposed and verified by both calculations and experiments. We implement the proposed method using a direct far‐field measurement system by adding a few supporting structures. The results show good accuracy.