Computation of antenna directivity from cylindrical near–field measurements

An effective technique is proposed in this paper for evaluating the directivity of an antenna under test from near-field measurements on a cylinder. It employs a closed-form formula for computing the total radiated power from the knowledge of the radiation intensity samples on the far-field sphere. These samples are determined via a probe-compensated near-field–far-field transformation and result to be even in number on each parallel. The effectiveness of such a procedure is assessed through numerical tests