Tunable full medium multi-frequency band isotrope zero-refraction flat-plate lens and preparation thereof

An isotropic, flat lens technology, applied in the directions of waveguides, circuits, electrical components, etc., can solve the problems of limited application range, difficult to zero refraction effect, limited practical application, etc., to achieve the effect of improving directivity

Inactive Publication Date: 2009-06-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, zero-refraction materials are usually composed of metal structural units with electromagnetic response. The two structural units respectively achieve zero dielectric constant or zero magnetic permeability. It is difficult to use the same metal structural unit to simultaneously achieve zero-refractive effects in different frequency bands.
At the same time, the electromagnetic response characteristics of zero-refraction materials based on metal structural units are anisotropic, t

Method used

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  • Tunable full medium multi-frequency band isotrope zero-refraction flat-plate lens and preparation thereof
  • Tunable full medium multi-frequency band isotrope zero-refraction flat-plate lens and preparation thereof
  • Tunable full medium multi-frequency band isotrope zero-refraction flat-plate lens and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Ba with a mass ratio of 20:3 0.5 Sr 0.5 TiO 3Mix with MgO powder and a certain amount of alcohol and put it into a ball mill jar for ball milling for 24 hours, then dry the alcohol in an oven at 60°C to obtain a uniformly mixed medium powder; mix the medium powder with 5wt% polyvinyl alcohol resin Uniformly mixed and granulated and pressed into a columnar rough body by isostatic pressing; the rough body was degummed in an electric furnace at 300-600°C, and then sintered at 1400°C for 3 hours to obtain a dense columnar ceramic block ; Cut the ceramic column into a dielectric cube 1 with a side length of 1.75mm by using laser ceramic micromachining technology, and its microwave dielectric constant is 195 at a room temperature of 25°C.

[0031] Arrange the dielectric cubes into a simple cubic lattice with a lattice constant of 3.0 mm, and the volume fraction is 30%, and use epoxy resin 2 to cure the periodic lattice structure to obtain a composite of dielectric particles...

Embodiment 2

[0035] With embodiment one, the Ba that mass ratio is 9:1 0.5 Sr 0.5 TiO 3 Ball milling with MgO powder and using isostatic pressing forming technology to form a columnar blank body; debinding the blank body in an electric furnace and sintering it to a dense columnar ceramic block at 1400 ° C; using laser ceramic micromachining technology to cut the ceramic column into The dielectric cube 1 with a side length of 0.5mm has a microwave dielectric constant of 350 at a room temperature of 25°C.

[0036] Arrange the dielectric cubes into a simple cubic lattice with a lattice constant of 1.0mm, and the volume fraction is 12.5%, and use epoxy resin 2 to cure the periodic lattice structure to obtain a composite of dielectric particles dispersed in epoxy resin material, and then cut the composite material into a flat plate shape; use a bench drill to punch a through hole 3 with a diameter of 3.0mm in the center of the flat lens, and place a monopole antenna 5 in the hole; finally, pl...

Embodiment 3

[0038] With embodiment one, Pb x Sr 1-x TiO 3 The powder is ball milled and pressed into a columnar rough body by isostatic pressing technology; the rough body is degummed in an electric furnace and sintered at 1300°C to a dense columnar ceramic block; the ceramic column is cut into side lengths by laser ceramic micromachining technology Dielectric cube 1 with a diameter of 3.0mm has a microwave dielectric constant of 450 at a room temperature of 25°C.

[0039] Arrange the dielectric cubes into a simple cubic lattice with a lattice constant of 8.0mm, and the volume fraction is 5%, and use epoxy resin 2 to cure the periodic lattice structure to obtain a composite of dielectric particles dispersed in epoxy resin material, and then cut the composite material into a flat plate shape; use a bench drill to punch a through hole 3 with a diameter of 3.0mm in the center of the flat lens, and place a monopole antenna 5 in the hole; finally, place the above-mentioned medium plate In t...

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Abstract

Disclosed are a tunable all-dielectric multiband isotropic zero-refractive flat lens and a fabricating method thereof, wherein the lens comprises an all-dielectric composite flat panel and a temperature control device, the all-dielectric composite flat panel is formed by non-metallic non-magnetic dielectric particles which are periodically arranged or randomly arranged into an array solidified in another epoxy resin substrate, and the dielectric constant of the epoxy resin substrate is far less than that of the dielectric particles. The lens is capable of realizing an effective dielectric constant being zero at certain frequency and an effective magnetic conductivity being zero at certain frequency, thereby realizing zero refraction effect and having the isotropic electromagnetic response characteristic. The controllable zero-refractive effect of temperature is realized by utilizing the sensitive response characteristic of the particle dielectric constant upon the temperature. The lens is capable of realizing zero refraction in the interface for an electromagnetic wave source in the lens, thereby changing the outgoing electromagnetic wave into parallel light rays and improving the directionality of light source, and the tunable all-dielectric multiband isotropic zero-refractive flat lens can be widely applied to the electromagnetic wave communication field.

Description

technical field [0001] The invention relates to an all-dielectric zero-refraction plate lens, in particular to a temperature-tunable all-dielectric multi-band isotropic zero-refraction plate lens. Background technique [0002] Metamaterials (Metamaterials) is a kind of artificial electromagnetic material, which has strange electromagnetic properties that the existing materials in nature do not have. Among them, the metamaterials whose effective permittivity and magnetic permeability are less than zero at the same time are called negative refraction materials or left-handed metamaterials (Left-handed metamaterials, LHMs). Generally, LHMs are composed of metal structural units with electromagnetic response, such as typical metal split ring resonators (SRRs) and metal rod structural units to achieve negative magnetic permeability and negative permittivity, Ω structural units, fishing nets, etc. structure and fractal tree structure etc. [0003] Another type of metamaterial wi...

Claims

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Application Information

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IPC IPC(8): H01P3/20
Inventor 赵乾孟永钢
Owner TSINGHUA UNIV
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