| 摘要 |
<p>A method for manufacturing an antenna or antenna array and the antenna or antenna array itself with an operating frequency band, comprising antenna elements (101,404) is provided. The antenna or antenna array is integrated in a vehicle structure (401) wherein a RAM structure (403, 502), conforming to the shape of the vehicle structure and comprising at least one layer of RAM material (504-507) with an inner surface (407, 508) facing the antenna element and an outer surface (408, 507) being an outer surface of the vehicle structure, is mounted in front of the antenna elements. Each RAM-layer denoted i is defined by a thickness d i and frequency dependent RAM properties:
relative permittivity µ i ,
relative permeability µ i The frequency dependency of the RAM properties being tailored and the thickness d i and the number of RAM layers is selected such that the RAM structure is substantially transparent in the operating band, reaching a predetermined Farfield pattern requirement, and simultaneously is an effective absorber, reaching a predetermined Radar Cross Section (RCS) requirement RCS th , at frequencies in a threat band comprising frequencies above the operating frequency band of the antenna, and an RCS requirement RCS op in the operating frequency band.</p> |
