Broadband frequency selective surface

A frequency-selective surface and wide-band technology, applied in the field of electromagnetic fields and microwaves, can solve the problems of large incident wave loss, affecting passband performance, and low angular stability, so as to reduce insertion loss, reduce structural thickness, and increase angular stability. sexual effect

Inactive Publication Date: 2019-02-01
XIDIAN UNIV +1
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  • Abstract
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Problems solved by technology

The frequency selection surface can well cover the 5.85GHZ-18.45GHZ frequency band, but its angular stability is not high, it can only be incident at a 30° incident angle, and the insertion loss of the working frequency band is as high as -3dB, resulting in relatively low incident wave loss on the frequency selection surface. Large, affecting the performance of the passband in its working frequency band

Method used

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Embodiment Construction

[0026] Embodiments and effects of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] refer to figure 1 , the present embodiment is a frequency selective surface with broadband characteristics, which is composed of the first dielectric layer 1, the second dielectric layer 2, the third dielectric layer 3 and the fourth dielectric layer 4 from top to bottom Superposition composition, each dielectric layer adopts a thickness t of 0.8mm, a relative permittivity ε'=3.55, a relative permeability μ'=1, and an electric loss tangent tanδ D =0.0027, magnetic loss tangent tanδ M = 0 RO4003 material; each dielectric layer is provided with an array composed of M×N resonant units, the center distance of the resonant units, that is, the unit period D is 7.8mm to 7.9mm, and this example is taken but not limited to D=7.8mm , where M≥7, N≥7.

[0028] refer to figure 2 , the first layer of dielectric board 1 is provided wit...

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Abstract

The invention discloses a broadband frequency selective surface, and mainly solves the problems that the insertion loss is big and the angle stability is poor in the prior art. The broadband frequencyselective surface is formed by the stacking of multiple dielectric plates. Each dielectric plate is printed with M*N resonant units, and the resonant units are periodically distributed to form an array. Each resonant unit of the upper surface of the first dielectric plate (1) and the upper surface of the third dielectric plate (3) and the lower surface of the fourth dielectric plate (4) is a circular metal patch, and each resonant unit of the upper surface of the second dielectric plate (2) and the upper surface of the fourth dielectric plate (4) is a deformed cross-shaped metal patch, wherein the center of the deformed cross-shaped metal patch is circular. The broadband frequency selective surface can cover the band X, and has the characteristics of wide bandwidth, high transmissivity, out-band sharp drop and high cut-off, can improve the angle stability in the working band of 5GHZ-13GHZ, reduces the insertion loss within the working band, and can be used for radomes, communication and cloaking scenes.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic fields and microwaves, and in particular relates to a broadband frequency selection structure, which can be used in radome, communication and stealth scenes. Background technique [0002] With the rapid development of new technologies such as communication and radome, the broadband frequency selective structure with characteristics of high wave penetration, out-of-band steep drop and high cut-off has become a new research hotspot. In the field of communication and information, how to reduce the reflection cross-sectional area of ​​radar has become a key issue in radar design. With the development and progress of radar, radar can involve multiple frequency bands, such as L-band, S-band, X-band, etc. The radome based on the frequency selective surface can realize the function of high transparency in the working frequency band and high reflection outside the working frequency band, which pla...

Claims

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Application Information

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IPC IPC(8): H01Q15/00
CPCH01Q15/0026
Inventor 姜文任皓龚书喜余俊甘雷
Owner XIDIAN UNIV
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