Analysis of beam tilting behaviour for the measurement of EUT radiating slots

Abstract

In this paper, beam tilting behavior of radiating slots is introduced. When the radiating field intensity is measured in EMI/EMC test, the receiving antenna or probe must be moved along its vertical axis because of its beam tilting behavior. The radiation pattern is measured by near-field measurement system and verified by the finite difference time-domain (FDTD) method. The far-field pattern was obtained from near far field transformation by using near-field data. The beam tilted about 18 /spl deg/ at 10.82 GHz and the FDTD method provides a good result to this measurement.