A curved conformal frequency selective surface radome

Abstract

The present invention relates to a curved conformal frequency selective surface radome. The radome includes a dielectric radome and a curved surface conformal frequency selective array set on its outer wall; the dielectric radome includes a top, a round platform, and a hollow cylinder integrally formed from top to bottom; the inner and outer sides of the top are spherically processed; the round platform is The top-to-bottom truncated cone structure; the radius of the inner wall of the hollow cylinder is equal to the radius of the inner wall of the bottom of the circular table, and the outer radius is equal to the radius of the outer wall of the bottom of the circular table; the surface conformal frequency selection array is composed of a folded frequency selection unit outside the dielectric radome The surface is formed in an array according to the principle of periodic arrangement; the folded frequency selection unit is an axisymmetric and centrally symmetrical slit structure, and the overall shape is composed of left, upper, right, and lower folded slits, and the four folded slits are connected sequentially in a square shape. The folding frequency selection unit removes four folding gaps, and the remaining parts are metal patches. The invention has strong anti-interference ability and can realize good in-band passability and out-of-band suppression.

Description

technical field [0001] The invention relates to the technical field of microwave frequency selective radome, in particular to a curved surface conformal frequency selective surface radome. Background technique [0002] In the era of electronic warfare, it is very important to protect antenna equipment from the interference and damage of harsh natural environments and complex electromagnetic environments. Therefore, it is of long-term significance to design microwave / millimeter wave passive devices that improve the stability and sensitivity of antenna systems and prolong their working life. Frequency selective radome (E.Pelton and B.Munk, "A streamlined metallic radome," in IEEE Transactions on Antennas and Propagation, vol.22, no.6, pp.799-803, November 1974, doi:10.1109 / TAP .1974.1140896.) As a spatial filter, it plays a key role in the modern military field. It can be used to improve the in-band permeability and out-of-band suppression of the system, and is developing towa...

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Problems solved by technology

The traditional frequency selection radome mostly works in the lower frequency bands such as X / K / Ku, and the size is relatively large, and the frequency selection is mostly planar array (G.Q.Luo et al., "Filtenna Consisting of Horn Antenna and Substrate Integrated Waveguide Cavity FSS, "in IEEE Transactions on Antennas and Propagation, vol.55, no.1, pp.92-98, Jan.2007, doi: 10.1109 / TAP.2006.888459.) appears in the form, which cannot meet the needs of antennas in the contemporary defense and aerospace fields. Therefore, it is particularly important to design a frequency-selective radome that works at millimeter waves and achieves surface conformality.

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