Super-miniaturized 2.5-dimensional absorption and transmission integrated frequency-selective wave absorber

Abstract

The invention relates to a super-miniaturized 2.5-dimensional absorption and transmission integrated frequency-selective wave absorber which comprises a plurality of metamaterial units which are continuously and periodically arranged, and each metamaterial unit comprises a top resonance layer, a first dielectric layer, a second dielectric layer, a third dielectric layer and a bottom resonance layer which are sequentially stacked from top to bottom. The top resonance layer comprises a first metal patch unit, a thin-film resistor and four second metal patch units; and the bottom of the first dielectric layer is provided with four third metal patch units, each third metal patch unit is correspondingly connected with the second metal patch unit through a metalized through hole, and the bottom resonance layer is provided with a hollow structure. According to the 2.5-dimensional absorption and transmission integrated frequency-selective wave absorber, a graphene film is adopted to replace a lumped resistor, planar integration and batch production are facilitated, the design that folded metal strips and through holes are combined is utilized, the structure is ultra-miniaturized, grating lobes are restrained, the double-station RCS under oblique incidence is reduced, and the oblique incidence stealth performance is improved.

Description

technical field [0001] The invention belongs to the technical field of antenna stealth, and in particular relates to an ultra-miniature 2.5-dimensional absorption and penetration integrated frequency selective absorber. Background technique [0002] The radome is installed on the outside of electromagnetic equipment such as radar antennas on various weapons and aircraft to protect the internal system from external electromagnetic interference. At the same time, the radome also provides a wave-transmitting window to ensure that various The radar antenna can transmit and receive electromagnetic signals normally. [0003] With the rapid development of antenna stealth technology, the functional requirements of the radome are getting higher and higher, and the radome loaded with FSS has become a research hotspot. composed of two-dimensional structures. When the frequency of the incident electromagnetic wave is at the resonant frequency of the unit, the FSS exhibits the characte...

AI Technical Summary

Problems solved by technology

The radome based on bandpass FSS can realize in-band wave transmission and out-of-band total reflection. However, this kind of stealth method cannot realize the stealth of dual base station or multi-base station detection. Electromagnetic waves, but out-of-band electromagnetic waves need to be lost, so the absorbing and penetrating integrated absorber was proposed

[0004] In recent years, many researchers have proposed a large number of broadband, low-profile, flexible, and multi-functional absorbers, which provide a solid theoretical basis and design examples for the development of domestic antenna stealth technology, but each has its own existence. For example, Jianjun Jiang’s team proposed two kinds of absorbing and penetrating integrated absorbers with double loss layers. This design can improve the absorbing bandwidth, but at the cost of increasing the structural period. The periods of the two designs are 20 mm and 20 mm respectively. 40 mm, the consequence of this large periodic structure is that grating lobes will appear under oblique incidence, and the grating lobes will cause the rise of the dual-station RCS

Moreover, the absorber with a period of 40 mm will produce grating lobes under normal incidence, which seriously affects the stealth performance.

Shaobin Liu's team proposed a wide-band wave-absorbing integrated absorber, but this structure introduces lumped resistance, which increases the complexity of the process and is very unfavorable for planar integration and mass production. At the same time, the lumped resistance Types are limited in high-frequency references, which is not conducive to the application of the idea of ​​this structure in high-frequency

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