Broadband wide-angle frequency selective surface radome

Abstract

The invention belongs to the technical field of stealth technology and radar antennas, and particularly relates to a broadband wide-angle frequency selective surface radome, which is formed by arranging a plurality of basic units in an array mode. Each basic unit comprises a first dielectric layer, a second dielectric layer, a frequency selective surface layer and a third dielectric layer, which are sequentially arranged. The dielectric layers are symmetrically loaded and form the Chebyshev impedance converter with the frequency selective surface layers, so that the problems of narrow wave-transparent frequency band, low wave-transparent rate and unstable angle of the radome are solved; meanwhile, the frequency selective surface layer is formed by utilizing the metamaterial design principle; the radome is formed by arranging the basic units periodically in the form of a square, and comprises a uniquely designed miniaturized sub-wavelength periodic pattern; and compared with a multi-layer radome loaded with a metal mesh, a multi-layer metamaterial surface coupling form and other forms of frequency selective surfaces, the radome is wider in high-wave-transmission relative bandwidth and wider in angle application range, and is simple in structure and low in cost.

Description

technical field [0001] The invention belongs to the field of stealth technology and radar antenna technology, in particular to a wide-band and wide-angle frequency selection surface radome. Background technique [0002] In the traditional radome design, the frequency band of the radome is relatively narrow (1-3%), and the radome with a single-layer half-wave wall structure can easily meet its electrical performance requirements. However, for broadband radome used in a certain frequency range, A, B, and C sandwich wall structures are commonly used. The A sandwich structure consists of a low dielectric constant, low loss, and low-density intermediate core layer (foam or honeycomb) structure) and two relatively dense and thin surface layers (skin) inside and outside. The B sandwich structure is composed of two low dielectric constant, low density surface layers and a relatively dense core layer; the C sandwich structure (five layers) is composed of two A sandwich structures. ...

AI Technical Summary

Problems solved by technology

Whether it is a radome with a half-wave wall or a multi-layer wall, the design principle of its wave transmission is based on electromagnetic wave interference, which will inevitably lead to the radome only meeting the requirements of high wave transmission at specific angles and characteristic frequency points. In addition, high Wave penetration requires that the radome dielectric material has a very low dielectric constant. Therefore, only foam, foam-like or porous materials with low dielectric constant are used as wave-transmissive materials, but the strength and mechanical properties of such materials are relatively low. Poor, a single material of this type cannot meet the mechanical and other performance requirements, so a multi-layer wall structure must be used to meet the bandwidth requirements

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