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Broadband low sidelobe circularly polarized array antenna loaded with super surface

An array antenna and metasurface technology, which is applied in the combination of antenna elements with different polarization directions, antenna arrays and antennas with separate power, can solve the problems of wide impedance broadband and axial ratio bandwidth, which cannot be realized, and achieve optimal axis The ratio, the design structure is simple and compact, and the effect of reducing the side lobe level

Active Publication Date: 2019-04-16
上海曼光信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent fails to achieve wide impedance bandwidth and axial ratio bandwidth

Method used

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  • Broadband low sidelobe circularly polarized array antenna loaded with super surface
  • Broadband low sidelobe circularly polarized array antenna loaded with super surface
  • Broadband low sidelobe circularly polarized array antenna loaded with super surface

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Experimental program
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Effect test

Embodiment 1

[0043] A broadband low-sidelobe circularly polarized array antenna loaded with a metasurface, such as figure 1 As shown, a metasurface, a dielectric layer 2, a radiation patch and a feed network, a dielectric layer 1, and a ground plane are stacked sequentially from top to bottom, and the radiation patch is loaded with a metasurface.

[0044] A layer of metasurface is loaded above the antenna. Due to the coupling with the antenna to generate surface waves, the propagation of surface waves on the metasurface will excite additional resonance points and the lowest axial ratio point, so the impedance bandwidth and axial ratio bandwidth of the antenna will be broadened.

Embodiment 2

[0046] A metasurface-loaded broadband low-sidelobe circularly polarized array antenna according to Embodiment 1, the difference is that:

[0047] Such as figure 2 As shown in , a transmission line is connected in series at the center of the radiating edge of the radiating patch, and the feed network is connected through the transmission line.

[0048] A section of transmission line is connected in series at the center of the radiating edge of the radiating patch, which can improve the input impedance characteristics of the antenna near the resonant frequency, so that the impedance change tends to be stable and purely real, which facilitates the subsequent formation of the array. According to the principle of transmission line impedance matching, the equivalent input impedance of the radiation patch viewed from the radiation side has an imaginary part and is a positive value equivalent to an inductance, and a small section of transmission line connected in series is equivalent...

Embodiment 3

[0051] A metasurface-loaded broadband low-sidelobe circularly polarized array antenna according to Embodiment 1 or 2, the difference is that:

[0052] Such as Figure 9 , 12 As shown, the feed network includes four sub-arrays arranged in sequence along the X axis, such as Figure 11 As shown, each sub-array includes two radiating patches arranged along the Y-axis direction and a 1-2 equal-power divider connecting the two radiating patches. The 1-half equal-power divider makes the two radiating patches The amplitude ratio of the excitation current is 1:1, and the phase difference is 90°; each of the four sub-arrays is connected to a unequal power divider that divides into four, so that the ratio of the output port currents of the four sub-arrays is 1 when the operating frequency is 5.8GHz :1.84:1.84:1, when the operating frequency is 4GHz to 6GHz, the ratio of the output port currents of the four sub-arrays is 1:1.82:1.82:1-1:1.86:1.86:1;

[0053] Dielectric layer 2 is a die...

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Abstract

The invention relates to a broadband low sidelobe circularly polarized array antenna loaded with a super surface. The broadband low sidelobe circularly polarized array antenna comprises the super surface, a radiation patch, a feeding network, a dielectric layer 2, a dielectric layer 1 and a grounding plate which are orderly stacked from top to bottom, and the super surface is loaded on the radiation patch. The impedance bandwidth and axial ratio bandwidth of the antenna are greatly increased. A transmission line is connected in series at the center of a radiation side of the radiation patch. The input impedance characteristics of the antenna near a resonant frequency can be improved, so that the impedance change tends to be stable and is a pure real number, and therefore, the subsequent arraying is facilitated. According to the invention, a 4-unit sequential rotary feed network is simplified into a 2-unit network, a one-to-four unequal power divider is used in the X direction, the axial ratio of the antenna can be optimized, and the sidelobe levels of XZ planes of the antenna can be reduced.

Description

technical field [0001] The invention relates to a metasurface-loaded broadband low-side lobe circularly polarized array antenna, which belongs to the technical field of communication antennas. Background technique [0002] As the radio frequency front-end of the wireless communication system, the performance of the antenna directly determines the quality of the communication, and the high-quality communication system puts forward higher requirements for the antenna: it needs a large enough bandwidth to meet the communication rate requirements; it needs low Sidelobe level to reduce the interference to the receiving antenna; circular polarization is required to resist multipath effects and rain and fog interference. [0003] The traditional circularly polarized unit adopts a square cut corner chip, but its bandwidth is narrow, generally only about 1%, and its input impedance changes drastically with frequency, which is not conducive to array formation. So how to improve the pe...

Claims

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Application Information

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IPC IPC(8): H01Q21/06H01Q21/24H01Q21/00H01Q1/50H01Q15/00
CPCH01Q1/50H01Q15/0086H01Q21/0075H01Q21/065H01Q21/24
Inventor 张城杜刘革赵佳
Owner 上海曼光信息科技有限公司
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