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Metamaterials and Antennas

A metamaterial and antenna technology, applied in the field of communication, can solve problems such as difficult implementation, and achieve the effect of reducing side lobes and improving directivity coefficients

Active Publication Date: 2018-12-21
KUANG CHI INST OF ADVANCED TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods may require changes to the structure of the antenna itself, which is not easy to implement, or require sacrificing certain parameters, and the gain outweighs the gain
At present, there is a lack of a solution in the existing technology that can improve the directivity coefficient and reduce the side lobe without changing the structure of the antenna itself or sacrificing some parameters.

Method used

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  • Metamaterials and Antennas
  • Metamaterials and Antennas
  • Metamaterials and Antennas

Examples

Experimental program
Comparison scheme
Effect test

example 4

[0091] Example 4 is mainly to adjust the single main lobe, increase the main lobe level, and reduce the half-beam angle.

[0092] The same pair of in-phase line source arrays work at 1.7GHz, the length of the line source is 529mm, and the normalized pattern is as follows Figure 17 , 18 As shown, the HPBW (Half Power Beam Width) is 17.29°. After the metamaterial with a thickness of D=20mm and the same length as the line source reflector is installed in front of the line source array and 104mm away from the line source reflector, the normalized direction diagram is as follows Figure 16 , 17 As shown, the HPBW is 16.27°, the half-beam angle is significantly reduced, and the directivity of the main lobe of the antenna is stronger.

[0093] The distribution mode of the refractive index and the arrangement mode of the conductive geometric structure inside the second sub-component sheet are:

[0094] The main lobe direction of the antenna is the z direction (radiation direction...

example 5

[0102] Example 5 is mainly to realize the adjustment of the side lobe (reduce the side lobe level):

[0103] The same pair of in-phase line source arrays work at 10GHz, the length of the line source is 270mm, and the normalized pattern is as follows Figure 21 shown. After adding a metamaterial with a thickness of D=3mm and the same length as the line source reflector at the front of the line source array and 15mm away from the line source reflector, the normalized direction diagram is as follows Figure 21 As shown, the side lobe level is obviously suppressed, and the stronger the anti-interference ability of the antenna is.

[0104] The adjustment of the amplitude distribution is achieved by controlling the losses throughout the material, Figure 22 Displays the distribution of the loss tangent (dielectric loss or magnetic loss) on the longitudinal section of the metamaterial. The law of the loss distribution on the longitudinal section is: the loss at the center is small,...

example 6

[0106] Example 6 is mainly to combine amplitude modulation and phase modulation to realize multi-beam adjustment through amplitude and phase weighting materials.

[0107] The working frequency of the array antenna is 3.3GHz, and the height of the aperture surface is 1.1m. Each beam pattern is as follows Figure 23 As shown in the figure, the negative angle in the figure is the beam hitting the ground; after installing a metamaterial with a thickness of D=30mm and the same height as the array antenna at 27mm in front of the array antenna (the distance from the reflector), each beam has been improved (see Figure 24 ), the ground-hitting sidelobe level is significantly suppressed, and the anti-interference ability of the antenna is enhanced.

[0108] The main lobe direction of the antenna is the z direction (radiation direction), the front surface of the metamaterial is the x-y plane, where the vertical direction is y (the center position of the metamaterial is marked as y=0 pos...

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Abstract

The invention provides a meta-material and an antenna. The meta-material is arranged on the radiation direction of the antenna and comprises a first subassembly. The first subassembly comprises one or more sheet layers, wherein each sheet layer is provided with an electric resonance and / or magnetic resonance microstructure, and the microstructures are uniformly periodically arranged on the sheet layers for changing wave transmitting rate and phase shift along with the change of the angles of incident waves. According to the technical scheme provided by the invention, under the condition that the structure of the antenna itself is not changed and certain parameters are not sacrificed, the directivity factor of the antenna can be improved, and the sidelobe of the antenna can also be reduced at the same time.

Description

technical field [0001] The invention relates to the field of communication, in particular to a metamaterial and an antenna. Background technique [0002] In the current antenna technology, improving the directivity coefficient and reducing the side lobe are two important research topics. The directivity coefficient is a parameter used to indicate the degree to which the antenna radiates electromagnetic waves in a certain direction (that is, the sharpness of the directivity pattern). In the medium wave and short wave bands, the directivity coefficient is about several to tens; in the meter wave range In the centimeter wave band, it can be as high as several thousand, or even tens of thousands. The higher the directivity coefficient, the better the performance of the antenna. The side lobe can represent whether the line power radiation is concentrated. The side lobe is relative to the main lobe. The smaller the width of the main lobe, the sharper the pattern, indicating that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q15/00H01Q19/02
Inventor 不公告发明人
Owner KUANG CHI INST OF ADVANCED TECH
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