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Broadband high-efficiency transmission type polarization converter

A polarization conversion and transmission type technology, applied in the field of electromagnetic wave propagation, can solve the problems of low transmission efficiency, large dielectric loss, excessive thickness, etc., and achieve the effects of low process requirements, easy processing and small size

Active Publication Date: 2018-08-07
HUAQIAO UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the size of the traditional polarization conversion device is too large, such as the thickness is too large or even much larger than its working wavelength
Among them, the grating with relatively small size has a large dielectric loss.
In the last ten years, with the development of metamaterials and metasurface material technologies, various new polarization control technologies have appeared, but most of them are reflective polarization converters, while transmissive polarizers based on metasurfaces in the literature Most of the working frequency band of the transformation converter is in terahertz, and the transmission efficiency is not high
As for the polarization converter in the microwave and millimeter wave bands, either the size is too large, or the transmission efficiency is not high

Method used

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  • Broadband high-efficiency transmission type polarization converter

Examples

Experimental program
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Effect test

Embodiment 1

[0043] refer to figure 1 , a broadband high-efficiency transmissive polarization converter, comprising: two layers of dielectric substrates 1 and 2 stacked; metal pattern 3;

[0044] The metal pattern 3 is composed of a number of polarization conversion unit structures arranged periodically; the polarization conversion unit structure includes a metal ring and a dipole placed in the metal ring, and the dipole and the metal ring do not interact with each other. Contact; the metal patterns on each surface may be the same or different; the dielectric constants of each of the dielectric substrates may be the same or different;

[0045] The metal ring is a square metal ring, and two metal stub groups are connected inline. The metal stub groups are rotationally symmetrically distributed around the axis of the metal ring, and each metal stub group includes two parallel metal stub groups. A long metal stub 5; one end of the metal stub 5 is connected to the inner wall of the metal rin...

Embodiment 2

[0060] As another example of linear polarization conversion, the transmission phase difference can be controlled to be 180° by changing the size of the unit, so as to realize 90° polarization conversion between line-line polarization;

[0061] Such as Figure 7 , the polarization conversion unit structure is a 90° linear polarization unit structure, the period p of the 90° linear polarization unit structure is 4mm, and the thickness is 3mm, which is about the center frequency wavelength of the working frequency band of the broadband high-efficiency transmission polarization converter A quarter of that, the dielectric constant of the dielectric substrates 1 and 2 is 2.55. Etch metal square rings with a length p of 4 mm and a width s of 0.2 mm along the four sides of the dielectric substrate 1 and 2, and there are two square rings with a length ld of 0.8 mm, a distance d of 1.1 mm, and a width s of 0.2mm stub bar, an orthogonal cross vibrator placed along the X-axis and Y-axis ...

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Abstract

The invention discloses a broadband high-efficiency transmission type polarization converter, which comprises a dielectric substrate and a metal pattern which is etched on and between the surfaces ofthe dielectric substrate. The metal pattern is formed by periodically arranging a plurality of polarization conversion unit structures. Polarization decomposition is realized on incident polarized electromagnetic waves by utilizing the metamaterial polarization conversion lens. When being incident at an appropriate polarization angle, linearly polarized waves, after passing through the polarization converter, are divided into two linearly polarized wave components with equal amplitude and a phase difference of 90 degrees or 180 degrees. When the phase difference is 90 degrees, the two mutuallyperpendicular linearly polarized waves are incident at a proper polarization angle and can be converted into left-handed circularly polarized waves and right-handed circularly polarized waves respectively after passing through lens. When the phase difference is 180 degrees, linear polarization 90-degree or other arbitrary angle rotation of can be realized. The broadband high-efficiency transmission type polarization converter can be designed in any frequency band of microwaves and millimeter waves. The method is simple and practical, the design, machining and assembling are facilitated, the size is thin, the weight is light, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave propagation, and in particular relates to electromagnetic wave polarization conversion. Background technique [0002] Polarization is one of the important characteristics of electromagnetic waves and plays an important role in wireless signal transmission and measurement. Electromagnetic waves are divided into linearly polarized waves, circularly polarized waves, and elliptical polarized waves according to the polarization method. With the development of wireless systems such as communication and radar, the control and transformation of the polarization of electromagnetic waves is becoming more and more important. The electromagnetic waves emitted by most of the current microwave generators are basically linearly polarized. With the development of satellite communications and space exploration and the needs of radar technology for tracking and positioning targets in various polarizat...

Claims

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Application Information

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IPC IPC(8): H01Q15/24
CPCH01Q15/242H01Q15/244H01Q15/246
Inventor 葛悦禾林成秀陈徐湘
Owner HUAQIAO UNIVERSITY
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