NUMERICAL ANALYSIS OF LINEAR DIPOLE ARRAY ANTENNAS USING A REFINED DISTANCE APPROXIMATION

Türkçe

This study investigates the accuracy limitations of classical far-field approximation methods commonly employed in linear array antenna analysis, particularly in regions close to the far-field boundary. In the classical approach, the distances between array elements and the observation point are represented by approximate expressions, which may result in zero-valued electric fields at certain angles and lead to inaccurate predictions of main-lobe and side-lobe directions. To address this issue, an alternative approach for approximating the distance-dependent amplitude terms is proposed. The proposed method retains the closed-form calculability of the classical technique while more accurately representing amplitude variations.The suggested method greatly increases accuracy close to the far-field border by lowering main-lobe and side-lobe deviations, according to numerical data for linear dipole arrays. Both the traditional and suggested approaches converge to the reference far-field solution as the observation distance grows; comparable patterns are seen for endfire arrays.These results show that the suggested method helps anticipate array antenna patterns more accurately, especially in near-far-field zones, providing a useful technique for antenna array analysis and design applications.