The Determination of the True Side-Lobe Level of Long Broadside Arrays from Radiation-Pattern Measurements made in the Fresnel Region

The radiation pattern in the Fresnel region is expressed as a function of the far-field polar diagram. Following this it is shown how the true side-lobe level may be inferred from amplitude radiation-pattern measurements made in the Fresnel region. This results in considerable shortening of the range at which polar-diagram measurements may be made.