CN103337709B - A tunable all dielectric isotropy phase controller and a phase control method - Google Patents
A tunable all dielectric isotropy phase controller and a phase control method Download PDFInfo
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Abstract
Provided is a tunable all dielectric isotropy phase controller and a phase control method which belongs to the technical field of electromagnetic wave control. The phase controller is composed of a substrate, medium particles, and a temperature control device. The substrate is processed to be provided with orifices which are in a periodic circular array configuration or in an oval array configuration. The medium particles are arranged in the small holes. The substrate and the medium particles are arranged in the temperature control device. The phase controller enables an effective dielectric constant or an effective magnetic permeability in a specific frequency range closed to zero, so that control of a phase which emits electromagnetic waves is realized, and the phase controller is provided with isotropy electromagnetic response characteristics. Control of electromagnetic phases in different frequency ranges is realized by utilizing the sensitive response characteristics of the medium particles and through the temperature control apparatus which adjusts temperatures. The tunable all dielectric isotropy phase controller and the phase control method of the invention are very significant for the control of electromagnetic wave phases and camouflaging of wave source positions, and can be widely applied to the field of electromagnetic wave control.
Description
Technical field
The present invention relates to a kind of electromagnetic wave phase level controller, belong to electromagnetic wave control technology field.
Background technology
Realize following one's bent to electromagnetic wave propagation and accurately effective control is the target that the mankind pursue always.For a long time, people utilize the medium with homogeneous physical characteristic to make optical lens, achieve the control to visible ray propagation path.Certainly its effect is not completely desirable, and it is subject to the restriction of medium character homogeneity, effectively cannot control electromagnetic phase place.In recent years, the development of Meta Materials (Metamaterials) enables people realize the non-existent unusual electromagnetic property of nature, wherein zero refraction Meta Materials shows its outstanding effect in phase control, wave-shaping etc., is the forward position in ongoing research area and hot issue.Zero refraction Meta Materials can make the electromagnetic wave propagated, at medium interface place, zero refraction effect occur wherein, thus use radio magnetic wave and propagate along the normal direction at interface, this is significant for the directivity, modulated electromagnetic wave phase etc. improving antenna and wave source, can be widely used in electromagnetic wave control field.
At present about the research of zero refraction effect mainly concentrates on anisotropy zero refraction effect, its electromagnetic parameter is 0 in one direction, and is 1 on two other orthogonal direction.This makes the phase place in its uncontrollable medium, and anisotropic electromagnetic property can make it be subject to larger restriction in the application.In addition for anisotropy zero refraction effect realized under study for action, metal structure unit is the basic structural unit forming Meta Materials.Metal has larger ohmic loss, and this can reduce its measurability greatly at visible light frequency band; And its structure of metal structure unit is once determine, the frequency range that zero refraction effect produces also determines thus do not have tunability thereupon.Visible, the anisotropy Meta Materials be made up of metal structure unit is also not suitable for constructing phase controller.Therefore, design the isotropic phase controller of a kind of tunable full medium and just seem particularly important.
Summary of the invention
The object of the invention is to utilize the resonance effect of media particle to realize effective dielectric constant or effective permeability close to zero, thus realize the control to electromagnetic wave phase place; Utilize media particle dielectric constant to the sensitive response characteristic of temperature, regulate temperature by attemperating unit, thus realize the control of the electromagnetic wave phase place of different frequency range.
Technical scheme of the present invention is as follows:
A kind of tunable full medium isotropic phase level controller, is characterized in that: this phase controller is made up of substrate, media particle and attemperating unit; Substrate is processed with the aperture of periodically circular array arrangement or oval-shaped array arrangement, media particle is placed in aperture; Substrate and media particle are positioned in attemperating unit.
Tunable full medium isotropic phase level controller of the present invention, be further characterized in that: described media particle is ceramic dielectric particle, and the microwave permittivity 25 DEG C time is 195 ~ 750, its shape is cube medium block of the length of side 0.5 ~ 3.0mm or diameter is the medium ball of 0.5 ~ 3.0mm.
Tunable full medium isotropic phase control method of the present invention, is characterized in that the method comprises the following steps:
1) grinding cutting technique is utilized ceramics cylinder to be processed into cube medium block of the length of side 0.5 ~ 3.0mm or diameter is the medium ball of 0.5 ~ 3.0mm;
2) utilize numerical controlled carving technology to process substrate, and on substrate, process the aperture of periodically circular array arrangement or oval-shaped array arrangement, the size of aperture and the size of media particle match;
3) filled media particle one by one in aperture, and be positioned in attemperating unit by substrate and media particle, utilizes the resonance effect of media particle to realize effective dielectric constant or effective permeability close to zero, realizes the control to electromagnetic wave phase place; Regulate temperature by attemperating unit, utilize media particle dielectric constant to the sensitive response characteristic of temperature, realize the control of the electromagnetic wave phase place of different frequency range.
The present invention has the following advantages and high-lighting effect: the present invention utilizes the resonance effect of media particle to achieve effective dielectric constant or effective permeability close to zero, thus achieves the control to electromagnetic wave phase place; Utilize media particle dielectric constant to the sensitive response characteristic of temperature, regulate temperature by attemperating unit, thus achieve the control of the electromagnetic wave phase place of different frequency range.The invention provides a kind of tunable full medium isotropic phase level controller and phase control method, achieve the development of Meta Materials in application, and will the research direction such as camouflage of electromagnetic wave phase control, wave source position be applied to.
Accompanying drawing explanation
Fig. 1 is tunable full medium isotropic phase level controller schematic diagram.
Fig. 2 is phase controller effective refractive index dispersion curve at different temperatures (media particle dielectric constant is 121, and the media particle length of side is 1.84mm, and intergranular space is about 2mm).
Fig. 3 is circular phase controller control effects schematic diagram.
Fig. 4 is oval phase controller control effects schematic diagram.
Fig. 5 is phase controller test design sketch (inoperative frequency range).
Fig. 6 is phase controller test design sketch (working frequency range).
In figure: 1-media particle; 2-substrate; 3-aperture; 4-attemperating unit; 5-pole sub antenna; 6-electromagnetic wave equiphase surface.
Embodiment
Fig. 1 is tunable full medium isotropic phase level controller schematic diagram provided by the invention, and this phase controller is made up of substrate 2, media particle 1 and attemperating unit 4.Substrate 2 is processed with the aperture 3 of periodically circular array arrangement or oval-shaped array arrangement, media particle 1 is placed in aperture 3; Substrate 2 and media particle 1 are positioned in attemperating unit 4.This phase controller utilizes the resonance effect of media particle to achieve effective dielectric constant or effective permeability close to zero, thus achieves the control to electromagnetic wave phase place; Utilize media particle dielectric constant to the sensitive response characteristic of temperature, regulate temperature by attemperating unit, thus achieve the control of the electromagnetic wave phase place of different frequency range.
Described media particle is ceramic dielectric particle, and the microwave permittivity 25 DEG C time is 195 ~ 750, and its shape is cube medium block of the length of side 0.5 ~ 3.0mm or diameter is the medium ball of 0.5 ~ 3.0mm.
Working mechanism of the present invention is as follows:
The present invention is a kind of tunable full medium isotropic phase level controller, first its core is utilize the electromagnetic resonance of media particle to realize isotropism zero dielectric constant and zero magnetic permeability of different frequency range, and realize the control to outgoing electromagnetic wave phase place by the geometric array arrangement of particle, be secondly the temperature adjustable utilizing the variation characteristic of media particle dielectric constant with temperature to realize phase controller working frequency range.
Refractive index n is the function of DIELECTRIC CONSTANT ε and magnetic permeability μ, namely
when dielectric constant and magnetic permeability have one to be zero, will occur that effective refractive index equals zero.Utilize Electromagnetic Scattering Characteristics and the effective medium theory of high dielectric constant particle, by selecting suitable media particle parameter (size etc. of the size of particle, dielectric constant, particulate interspaces) just can realize effective permeability or effective dielectric constant in a certain frequency range close to zero, the electromagnetic wave outgoing now in medium will perpendicular to dielectric surface.By arranging to the geometry of array of particles, just can control the shape of outgoing electromagnetic wave equiphase surface, thus realize the control to electromagnetic wave phase place.
Fig. 2 is phase controller effective refractive index dispersion curve at different temperatures (media particle dielectric constant is 121, and the media particle length of side is 1.84mm, and intergranular space is about 2mm).The change of the dielectric constant with temperature of media particle and changing.Therefore change temperature by attemperating unit and regulate its dielectric property, and then realize the control of electromagnetic wave phase place of different frequency range.
Fig. 3 is circular phase controller control effects schematic diagram.First utilize grinding cutting technique that ceramics cylinder is processed as media particle 1; Utilize numerical controlled carving technology to process substrate 2 subsequently, and process the aperture 3 of periodically circular array arrangement on a substrate 2, the size of aperture 3 and the size of media particle 1 match; Filled media particle 1 one by one in the aperture 3 of substrate 2, and substrate 2 and media particle 1 are positioned in attemperating unit 4, obtain the circular phase controller of tunable full medium isotropism.In real work, pole sub antenna 5 is positioned over the optional position in phase controller, its electromagnetic wave equiphase surface 6 launched is a series of concentric circless being the center of circle with pole sub antenna 5; After have passed through the circular array that media particle 1 forms, electromagnetic wave equiphase surface 6 becomes the concentric circles that the center of circle of a series of circular array formed with media particle 1 is the center of circle, namely achieves the control effects to electromagnetic wave equiphase surface 6.
Fig. 4 is oval phase controller control effects schematic diagram.First utilize grinding cutting technique that ceramics cylinder is processed as media particle 1; Utilize numerical controlled carving technology to process substrate 2 subsequently, and process the aperture 3 of periodical elliptical array arrangement on a substrate 2, the size of aperture 3 and the size of media particle 1 match; Filled media particle 1 one by one in the aperture 3 of substrate 2, and substrate 2 and media particle 1 are positioned in attemperating unit 4, obtain the oval phase controller of tunable full medium isotropism.In real work, pole sub antenna 5 is positioned over the optional position in phase controller, its electromagnetic wave equiphase surface 6 launched is a series of concentric circless being the center of circle with pole sub antenna 5; After have passed through the oval-shaped array that media particle 1 forms, electromagnetic wave equiphase surface 6 becomes a series of concentration ellipse, and the center of the oval-shaped array that its center and media particle 1 are formed coincides.Namely the control effects to electromagnetic wave equiphase surface 6 is achieved.
Implementation procedure of the present invention and effect are further illustrated by embodiment and accompanying drawing:
Embodiment:
First utilize grinding cutting technique that ceramics cylinder is processed as media particle 1, its shape is medium cubic block, and the length of side is 1.84mm.The material of media particle 1 is the strontium carbonate titanate ceramics of magnesium oxide doping, and its microwave permittivity 25 DEG C time is about 121.Utilize numerical controlled carving technology to process substrate 2 subsequently, the material of substrate 2 is polytetrafluoroethylene, and its thickness is 3mm.And processing the aperture 3 of periodically circular array arrangement on a substrate 2, aperture 3 is the square opening of degree of depth 2mm, and it is of a size of 2mm × 2mm, and aperture 3 gap is each other about 0.8mm, and the circular array diameter that aperture 3 is formed is 60mm.Filled media particle 1 one by one in the aperture 3 of substrate 2, and substrate 2 and media particle 1 are positioned in attemperating unit 4, obtain tunable full medium isotropic phase level controller.For verifying the control effects of this phase controller, pole sub antenna 5 is positioned over the optional position in phase controller, its magnetic distribution test effect as shown in Figure 5, Figure 6.As seen from Figure 5, when wave frequency is when inoperative frequency range (f=9.99GHz), the electromagnetic wave equiphase surface 6 of its outgoing is a series of concentric circless being the center of circle with pole sub antenna 5, and phase controller does not play control action; As seen from Figure 6, when electromagnetic wave frequency range is when working frequency range (f=12.10GHz), after have passed through the circular array that media particle 1 forms, electromagnetic wave equiphase surface 6 becomes the concentric circles that the center of circle of a series of circular array formed with media particle 1 is the center of circle, proves that this phase controller achieves the control effects to electromagnetic wave equiphase surface 6.
Claims (3)
1. a tunable full medium isotropic phase level controller, is characterized in that: this phase controller is made up of substrate (2), media particle (1) and attemperating unit (4); Substrate (2) is processed with the aperture (3) of periodically circular array arrangement or oval-shaped array arrangement, media particle (1) is placed in aperture (3); Substrate (2) and media particle (1) are positioned in attemperating unit (4).
2. according to tunable full medium isotropic phase level controller according to claim 1, it is characterized in that: described media particle (1) is ceramic dielectric particle, and the microwave permittivity 25 DEG C time is 195 ~ 750, its shape is cube medium block of the length of side 0.5 ~ 3.0mm or diameter is the medium ball of 0.5 ~ 3.0mm.
3. a tunable full medium isotropic phase control method, is characterized in that the method comprises the following steps:
1) grinding cutting technique is utilized ceramics cylinder to be processed into cube medium block of the length of side 0.5 ~ 3.0mm or diameter is the medium ball of 0.5 ~ 3.0mm;
2) numerical controlled carving technology is utilized to process substrate (2), and on substrate (2), processing the aperture (3) of periodically circular array arrangement or oval-shaped array arrangement, the size of aperture (3) and the size of media particle (1) match;
3) filled media particle (1) one by one in aperture (3), and substrate (2) and media particle (1) are positioned in attemperating unit (4), utilize the resonance effect of media particle to realize effective dielectric constant or effective permeability close to zero, realize the control to electromagnetic wave phase place; Regulate temperature by attemperating unit (4), utilize media particle dielectric constant to the sensitive response characteristic of temperature, realize the control of the electromagnetic wave phase place of different frequency range.
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| CN107046179B (en) * | 2016-09-18 | 2020-01-17 | 北京邮电大学 | Adjustable dielectric super surface |
| CN106684570B (en) * | 2016-12-20 | 2019-11-22 | 清华大学 | The unidirectional electromagnetic wave stealth device of tunable full medium |
| CN106972278B (en) * | 2017-03-16 | 2020-08-14 | 浙江大学 | All-dielectric zero-scattering particles and electromagnetic invisible material formed by same |
| CN107834207B (en) * | 2017-11-28 | 2020-07-31 | 电子科技大学 | Mercury-based temperature-tunable electromagnetic metamaterial and manufacturing method thereof |
| CN111799562A (en) * | 2020-06-22 | 2020-10-20 | 清华大学 | Tunable full-dielectric gradient magnetic conductivity two-dimensional omnidirectional stealth device and manufacturing method thereof |
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