Three-way bandwidth frequency band frequency selecting surface structure and antenna cover
A technology of frequency selection surface and frequency band, applied in the direction of radiation unit cover, waveguide type devices, electrical components, etc., can solve the problems of poor flat top characteristic steep drop, complex surface structure, narrow passband bandwidth, etc., to achieve flat top Good characteristics and steep drop characteristics, excellent performance, and the effect of wide passband bandwidth
Inactive Publication Date: 2015-05-13
NAT UNIV OF DEFENSE TECH
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to provide a three-way broadband frequency band frequency selection for the defects of the existing frequency selection surface structure is complicated, it is difficult to realize multiple frequency bands, the passband bandwidth is narrow, the flat top characteristic and the steep drop characteristic are not good. Surface structure and radome
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[0024] Below in conjunction with accompanying drawing and specific embodiment the present invention is discussed in further detail:
[0025] Such as figure 1 , the three-way broadband frequency band frequency selective surface structure of the present invention comprises a frequency selective surface 1, a dielectric substrate 2, and a frequency selective surface 3, wherein the frequency selective surface 1 and the frequency selective surface 3 have the same structure and size, and are all arranged periodically Composed of a patch unit 11, the patch unit 11 is composed of a square patch 111 with four sides cut into notches and four rectangular wave-shaped metal wires 112 of the same structural size, as figure 2 , 4 As shown, both the frequency selective surface 1 and the frequency selective surface 3 are etched on the dielectric substrate 2 clad with copper on both sides. The patch units 11 arranged in a two-dimensional period have a size of l_unit×l_unit and a period of l_u...
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The invention belongs to the technical field of spatial filtering, and particularly relates to a three-way bandwidth frequency band frequency selecting surface structure and an antenna cover. The antenna cover can serve as the antenna cover of a multi-frequency antenna of communication systems, such as radar and a satellite. The three-way bandwidth frequency band frequency selecting surface structure comprises a layer medium substrate, and two layers of same frequency selecting surfaces which are positioned on the upper side and the lower side of the layer medium substrate, wherein each frequency selecting surface consists of patch units which are arranged periodically; each patch unit comprises a square patch of which the four sides are cut into notches; the notches are rectangular openings, are positioned on the axes of the square, are in two-to-two correspondence and are not communicated with one another; a rectangular wave-shaped metal line extends from each rectangular opening; each metal line is connected with the metal lines of adjacent patch units on the periphery; the metal lines are positioned on the two symmetry axes of the square. The antenna cover is mounted out of an antenna or an antenna array; an electromagnetic valve incident plane of the antenna cover is formed by the three-way bandwidth frequency band frequency selecting surface structure.
Description
technical field [0001] The invention belongs to the technical field of space filtering, and in particular relates to a three-way broadband frequency band frequency selection surface structure and a radome, which can be used as a radome of a multi-frequency antenna for communication systems such as radars and satellites. Background technique [0002] Frequency Selective Surfaces (FSS for short) is a two-dimensional periodic structure, which is composed of metal patches periodically arranged on the surface of a medium or slot units periodically arranged on a metal screen, and has a band for electromagnetic waves passing through the structure. Pass (patch) or band-reject (slot) effect, equivalent to a spatial domain filter, with excellent performance such as insensitivity to incident angle and polarization, good frequency selectivity, and simple fabrication. It is often used to make radomes to achieve radar antenna shielding and stealth in aerospace. It can be used as a seconda...
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IPC IPC(8): H01P1/20H01Q1/42
Inventor 罗慧吴微微袁乃昌黄敬健吴敏杰周扬潘玉剑王青平卢洪树
Owner NAT UNIV OF DEFENSE TECH
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