A surface conformal frequency selective surface mask, design method and application

Abstract

The invention belongs to the technical field of frequency selective surfaces, and discloses a curved surface conformal frequency selective surface cover, a design method and an application thereof. Layer metal, first polyimide PI, glue layer, PMI foam, bandpass layer upper metal, second polyimide PI, bandpass layer upper metal, glue layer, high temperature resistant resin. The invention is suitable for the design scheme of the miniaturized low-profile bandpass FSR unit pattern of curved surface projection; the modeling and actual structure scheme of the curved surface FSS cover body. The inductance part in the FSR unit of the present invention is designed with different patterns in different projection directions to ensure connectivity after projection; the present invention proposes a projection method combining local deformation and parameter compensation to ensure the consistency of FSR electrical properties after curved surface projection. The unit pattern is compatible with the projection method, so as to realize the comprehensive design of the curved FSR cover.

Description

technical field [0001] The invention belongs to the technical field of frequency selective surfaces, and in particular relates to a curved surface conformal frequency selective surface mask, a design method and an application thereof. Background technique [0002] At present: The radome is an important part of the aircraft radar system. It is used to protect the radar antenna or the entire microwave system to work normally in harsh environments. It is an integrated part of aerodynamics, structure and wave-transmitting functions. Traditional radome meets the requirements of high transmittance of antenna electromagnetic wave of one's own antenna, but at the same time, it cannot prevent the enemy's detection electromagnetic wave from entering the inside of the radome, and the internal guidance equipment often has a large radar cross section (RCS), resulting in a huge echo signal . In order to take into account both the performance of the antenna and the stealth effect of the a...

AI Technical Summary

Problems solved by technology

[0008] (1) For the design of bandpass FSR, only focus on the innovation of structure and function, while ignoring the importance of high wave transmission rate under large angle in actual engineering

[0009] (2) The multi-layer miniaturization design leads to an increase in cross-section, which makes it difficult to process and shape on curved surfaces

[0010] (3) The design of the unit is only suitable for the plane, not for the projection of the curved mask

[0011] (4) When projecting the array, the deformation of the unit and the uneven distribution of the unit are not considered to cause changes in electrical properties

[0013] (1) It is necessary to consider the performance of the planar unit pattern and the projected unit pattern on the curved surface at the same time. It is also necessary to consider that the thickness of the actual soft board cannot be thick. Therefore, low-profile design must be carried out at the same time, and the difficulty of unit design will increase.

[0014] (2) In the projection method, it is necessary to ensure that the projection does not change the electrical properties, so the deformation of the local pattern and the compensation of the parameters are required, which increases the difficulty of the projection scheme

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