Bandstop Frequency Selective Surface Based on Low Dielectric Metamaterials
A frequency-selective surface and metamaterial technology, applied in the direction of waveguide devices, circuits, electrical components, etc., can solve the problems of very sensitive changes in metal structure parameters, high loss, and poor performance, and achieve low detectability and high Power capacity, adjustable effect
Inactive Publication Date: 2019-02-26
AIR FORCE UNIV PLA
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Problems solved by technology
[0003] Most of the existing metamaterials and frequency-selective surfaces are composed of periodic metal structure materials. Although metal-based metamaterials have their unique advantages, such as easy design and fabrication, and good compatibility with existing microwave electronic engineering processes, they also have Certain inherent shortcomings, such as not easy to expand to the micro-nano scale range, very sensitive to parameter changes of the metal structure, high loss, strong anisotropy, etc.
The limitations of the physical properties of metal materials make metal-based metamaterials not perform well in terms of low detectability and corrosion resistance, and cannot meet the needs of high-tech indicators such as aviation and military.
Traditional low-dielectric materials generally exhibit band-pass characteristics in the microwave range, and few studies have shown that they can be designed as band-stop frequency-selective surfaces
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Embodiment 1
[0021] It is required that the dielectric constant of the low dielectric polymer substrate is 4.3, the loss tangent is 0.001, the transmittance in the passband is greater than -3dB, and the reflectivity in the stopband is less than -10dB.
[0022] According to the calculation and optimization of the above-mentioned technical indicators, the final design structure obtained in Embodiment 1 of the present invention is as follows: the thickness of the low-dielectric polymer substrate is t=1.5mm, and the thickness of the air gap is D 1-5 =6.00, 6.25, 6.50, 6.75, 7.00mm, cycle size a=10.0mm, w 1 =5.14mm, w 2 =5.14mm, w 3 =6.82mm, l 1 =5.3mm, l 2 =6.52mm, l 3 =6.52mm get as Figure 1-3 A schematic diagram of the periodic structure is shown.
[0023] Calculate the transmission characteristics of the band-stop frequency-selective surface based on low-dielectric metamaterials, and the results are as follows Figure 4 and Figure 5 shown. As can be seen from the figure, the freq...
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The invention discloses a band-stop frequency selective surface based on low-dielectric metamaterials, which is composed of three layers of polymer dielectric substrates and an air layer sandwiched between two adjacent layers. The polymer dielectric substrates are etched into different side lengths. The square aperture structure, the polymer dielectric substrate adopts the low-dielectric and low-loss polymer dielectric substrate, which is prepared as a continuous periodic array, and the band-stop characteristics of FSS can be expanded and optimized by adjusting the side length of the square unit structure. The invention adopts the low-dielectric polymer substrate design, does not contain any metal materials, has the advantages of low loss, high power capacity and low detectability; it can realize the band-stop characteristics in the microwave section, and has the advantages of simple design and adjustable Strong and other characteristics.
Description
technical field [0001] The invention relates to the technical field of microwave space filtering of all-dielectric metamaterials, in particular to a band-stop frequency selective surface based on low-dielectric metamaterials. Background technique [0002] Frequency Selective Surface (FSS) is a kind of spatial filter, which is a planar or curved surface array composed of periodically arranged scatterers, and exhibits one or more bandpass and bandstop characteristics for electromagnetic waves. The traditional frequency selective surface is a two-dimensional periodic structure composed of periodically arranged metal patch units or slot units. It is widely used in radar radomes and reflectors in microwave, infrared and other frequency bands because of its specific frequency selective characteristics. noodle. Metamaterials refer to some artificial composite structures or composite materials with extraordinary physical properties that natural materials do not have. It is one of t...
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IPC IPC(8): H01P1/203
Inventor 余斐王军屈绍波王甲富马华杜红亮
Owner AIR FORCE UNIV PLA