| 摘要 |
FIELD: radio engineering, communication.SUBSTANCE: ultra-wideband multi-beam mirror antenna comprises an asymmetric parabolic reflector and a group of off-focus radiators located in the focal region, wherein the radiators are in the form of identical ultra-wideband ridged compound horns. The upper and lower regions of the working surface of the reflector are coated with a radar-absorbing coating with an inverse relationship between the magnitude of the reflection coefficient and frequency within the operating range. The central region, which is uncoated, has the shape of an ellipse in the projection on the aperture plane. The thickness of the coating around the elliptical region on an area with a width of (4-5)?increases linearly from zero to the full thickness of the coating. The phase of the reflection coefficient of the coating is not greater than 36° in the low-frequency part of the operating range, wherein the magnitude of the reflection coefficient is greater than 0.1. The magnitude of the reflection coefficient of the coating is selected to fall from 0.85 to 0.05 in a ninefold operating frequency range.EFFECT: low level of side lobes of partial beam patterns and high reliability of the antenna while simplifying the design of the reflector.2 cl, 4 dwg |
