Design method for pure medium electromagnetic lens based on meta-surface

An artificial electromagnetic surface and electromagnetic lens technology, applied in electrical components, optics, instruments, etc., can solve the problems of sub-wavelength structure design, difficult processing, narrow working frequency band, difficult to apply, etc., and achieve easy design and implementation, working frequency The effect of simple bandwidth and design method

Active Publication Date: 2015-02-25
GUANGDONG SHENGLU TELECOMM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the design and processing of this type of subwavelength structure are very difficult, and the working frequency band is narrow. The most fatal thing is that there are strict requirements on the polarization direction of the incident electromagnetic wave, and the loss is large, which is difficult to apply in practice.

Method used

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  • Design method for pure medium electromagnetic lens based on meta-surface
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  • Design method for pure medium electromagnetic lens based on meta-surface

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Embodiment 1

[0032] The present invention considers that the ultimate goal of the artificial electromagnetic surface of the metal structure is to realize the phase mutation of the secondary Huygens source, and there is another means to realize the phase mutation——change the thickness of the electromagnetic wave propagation medium, and the present invention designs a pure medium electromagnetic lens. Its working principle is as follows: the present invention uses figure 1 (a) As an example, suppose a beam of TE electromagnetic wave with θ i Angular oblique incident to a certain unit of the lens, the unit can be regarded as the mnth unit in the two-dimensional plane, the period length is one-half of the wavelength (L=λ 0 / 2), incident plane xz ⊥mn . Assuming that each unit is a uniform plane dielectric layer, the present invention can obtain a two-port network model according to the transmission line theory, such as figure 1 Shown in (b), on (z=0), down (z=h mn ) surface TE wavefields c...

Embodiment 2

[0050] Such as Figure 6 As shown, the present invention provides a kind of design method based on the pure dielectric electromagnetic lens of artificial electromagnetic surface, and this method comprises the steps:

[0051] Step 1: Obtain the relationship between the phase change and the thickness of the medium according to the medium material used in the lens and the wavelength of the working electromagnetic wave;

[0052] According to the formula: Obtain the relationship between the electromagnetic wave phase change and the thickness of the medium, where β = ω ( ϵ r - sin 2 θ i ) ϵ 0 μ 0 , Z c ...

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Abstract

The invention discloses a design method for a pure medium electromagnetic lens based on a meta-surface. The method includes the following steps that firstly, according to medium materials of the lens and the wavelength of working electromagnetic waves, the relation between phase changes and medium thicknesses is obtained; secondly, according to requirements for the type and focal length of the lens (a convex lens or a concave lens or a reflecting mirror), needed distribution of phase jumps is worked out; thirdly, according to phase distribution requirements, the medium lens with the corresponding thickness is established in electromagnetic simulation software, is simulated and finely adjusted and then can be manufactured, wherein the phase distribution phi is obtained according to the requirement of the lens designed in the second step, distribution of the medium thicknesses is worked out, and modeling and simulating are conducted in the electromagnetic simulation software. The design method is simple and flexible; along with reduction of incidence wavelengths, the focal length of the lens will be increased; a lens set composed of the lens and a traditional lens can eliminate chromatic aberration.

Description

technical field [0001] The invention relates to a pure dielectric electromagnetic lens based on an artificial electromagnetic surface, which belongs to the field of optoelectronic technology. Background technique [0002] Electromagnetic lenses are widely used in systems such as transmitting and receiving radio waves or light waves. Traditional electromagnetic lenses are generally pure dielectric lenses with arc-shaped surfaces. The principle is continuous phase change, and the most common ones are convex lenses and concave lenses. Its disadvantage is that it is bulky, thick and heavy. [0003] After 2000, the development of the theory of artificial electromagnetic materials (metamaterial) led to the appearance of several thin and light electromagnetic lenses. At present, the latest electromagnetic lens devices of this type are basically constructed from so-called metamaterials. For example, the application number is 201110080646.1, and the patent document titled "A Lens ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/08H01Q15/14G02B27/00
Inventor 王正斌陈进昌高超薛曼琳
Owner GUANGDONG SHENGLU TELECOMM TECH
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