CN102593611B - Point focusing flat lens antenna - Google Patents

Abstract

The invention discloses a point focusing flat lens antenna. The point focusing flat lens antenna comprises a shell which has an opening on one side, a feed source and a meta-material flat lens which is used to seal the shell opening. The meta-material flat lens comprises a first flat lens and a second flat lens, wherein the first flat lens is close to the feed source and the second flat lens fits the first flat lens. Through designing refractive index distribution of the first flat lens and the second flat lens, electromagnetic waves emitted by the feed source can be gathered into one point. According to the point focusing flat lens antenna of the invention, a traditional lens part is replaced by the meta-material flat lens; a curved surface with a complex processing shape and high precision requirement does not needed; manufacturing and processing are easy and cost is low.

Description

A kind of point focusing flat lens antenna

Technical field

The present invention relates to the communications field, more particularly, relate to a kind of point focusing flat lens antenna.

Background technology

Point focusing lens antenna is made up of waveguide trumpet antenna and lens conventionally.Be characterized in that wave beam converges formation focal spot in the focus of design.Focal length and caliber size can customize by user's requirement.When the focus of two point focusing lens antennas overlaps, the loss minimum between two antennas.Because near the region crossing point is less, be that research special material and material are in one of local microwave wave transparent characteristic, best method of reflection characteristic.Lens are most important parts in point focusing lens antenna, but because the lens of traditional point focusing lens antenna need the curved surface of processed complex, and the required precision of curved surface is very high, and therefore difficulty of processing is large, with high costs.

Summary of the invention

Technical problem to be solved by this invention is, for the large defect of its lens difficulty of processing of point focusing lens of the prior art, to provide a kind of processing simple point focusing flat lens antenna.

The technical solution adopted for the present invention to solve the technical problems is: a kind of point focusing flat lens antenna, described point focusing flat lens antenna comprises the shell of a side opening, be arranged on the feed of shell opposite side and seal the super material flat-plate lens of described shell aperture, described super material flat-plate lens comprises second flat-plate lens of fitting near the first flat-plate lens of feed and with the first flat-plate lens, described the first flat-plate lens comprises the first core layer, what described the first core layer comprised that multiple thickness is identical and refraction index profile is identical the first surpasses sheet of material, the described sheet of material that the first surpasses comprises the first base material and is arranged on multiple the first artificial micro-structurals on the first base material, described the second flat-plate lens comprises the second core layer, what described the second core layer comprised that multiple thickness is identical and refraction index profile is identical the second surpasses sheet of material, the described sheet of material that the second surpasses comprises the second base material and is arranged on multiple the second artificial micro-structurals on the second base material, the described refraction index profile n that the first surpasses sheet of material ₁(r) meet following formula:

$n_1\left(r\right)=n_{\min }+\frac{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="ss"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">ss</figure-callout>}}^2+{r_{\max }}^2}-\sqrt{{\mathrm{<figure-callout\; id="2"\; label="ss"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">ss</figure-callout>}}^2+r^2}}{\mathrm{<figure-callout\; id="1"\; label="d"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">d</figure-callout>}1};$

Wherein, n ₁(r) represent that the first surpassing radius in sheet of material is the refractive index value at r place, this radius r represents on the first flat-plate lens that any point is to the distance of the axis of the first flat-plate lens;

Ss is the distance of feed equivalent point to the first flat-plate lens, i.e. the focal length of the first flat-plate lens, and described feed equivalent point is in the focus of the first flat-plate lens;

D1 is the thickness of the first flat-plate lens;

R _maxrepresent the first to surpass the maximum radius of sheet of material;

N _minrepresent the first to surpass the refractive index minimum value of sheet of material;

The described refraction index profile n that the second surpasses sheet of material ₂(r) meet following formula:

$n_2\left(r\right)=n_{\max }-\frac{\sqrt{{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="HDA0000139692310000092.png,HDA0000139692310000102.png"\; state="\{\{state\}\}">d</figure-callout>}0}^2+r^2}-d0}{\mathrm{<figure-callout\; id="2"\; label="d"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">d</figure-callout>}2};$

Wherein, n ₂(r) represent that the second surpassing radius in sheet of material is the refractive index value at r place, this radius r represents on the second flat-plate lens that any point is to the distance of the axis of the second flat-plate lens;

D0 is the focal length of the second flat-plate lens;

D2 is the thickness of the second flat-plate lens;

N _maxrepresent the second to surpass the refractive index maximum of sheet of material.

Further, described the first base material comprises substrate and the first right substrate in the first left substrate, first of sheet, described multiple the first artificial micro-structural is folded in the first left substrate and first between substrate and in first between substrate and the first right substrate, described the second base material comprises substrate and the second right substrate in the second left substrate, second of sheet, and described multiple the second artificial micro-structurals are folded in the second left substrate and second between substrate and in second between substrate and the second right substrate.

Further, the described thickness that the first surpasses sheet of material is 0.836mm, wherein, in first, the thickness of substrate is 0.4mm, the thickness of the first left substrate and the first right substrate is 0.2mm, the thickness that is folded in the thickness of multiple the first artificial micro-structurals between substrate in the first left substrate and first and is folded in multiple the first artificial micro-structurals between substrate and the first right substrate in first is 0.018mm, the described thickness that the second surpasses sheet of material is 0.836mm, wherein, in second, the thickness of substrate is 0.4mm, the thickness of the second left substrate and the second right substrate is 0.2mm, the thickness that is folded in the thickness of multiple the second artificial micro-structurals between substrate in the second left substrate and second and is folded in multiple the second artificial micro-structurals between substrate and the second right substrate in second is 0.018mm.

Further, described the first flat-plate lens also comprises and is arranged on first impedance matching layer of the first core layer near feed one side surface, described the first impedance matching layer comprises the first impedance matching layer lamella that multiple thickness is identical, described the first impedance matching layer lamella comprises the first coupling base material of sheet and is arranged on multiple the 3rd artificial micro-structurals on the first coupling base material, the satisfied following formula of refraction index profile of described the first impedance matching layer lamella:

$n_{i1}\left(r\right)={n_{\min }}^{\frac{i1}{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">m</figure-callout>}1}}*n_1{\left(r\right)}^{\frac{m1-i1}{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">m</figure-callout>}1}};$

Wherein, m1 represents total number of plies of the first impedance matching layer lamella;

I1 represents the numbering of the first impedance matching layer lamella, near the first impedance matching layer lamella of the first core layer be numbered 1, near the m1 that is numbered of the first impedance matching layer lamella of feed, from the first core layer to feed direction, numbering increases successively.

Further, described the second flat-plate lens also comprises and is arranged on second impedance matching layer of the second core layer away from feed one side surface, described the second impedance matching layer comprises the second impedance matching layer lamella that multiple thickness is identical, described the second impedance matching layer lamella comprises the second coupling base material of sheet and is arranged on multiple the 4th artificial micro-structurals on the second coupling base material, the satisfied following formula of refraction index profile of described the second impedance matching layer lamella:

$n_{i2}\left(r\right)={n_{\min }}^{\frac{i2}{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">m</figure-callout>}2}}*n_2{\left(r\right)}^{\frac{m2-i2}{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">m</figure-callout>}2}};$

Wherein, m2 represents total number of plies of the second impedance matching layer lamella;

I2 represents the numbering of the second impedance matching layer lamella, near the second impedance matching layer lamella of the second core layer be numbered 1, near the m2 that is numbered of the second impedance matching layer lamella of air, from the second core layer to direction of air, numbering increases successively.

Further, described the first coupling base material comprises the left substrate of the first coupling of sheet, substrate and the right substrate of the first coupling in the first coupling, described multiple the 3rd artificial micro-structural be folded in the left substrate of the first coupling and first mate between substrate and in the first coupling substrate and first mate between right substrate, described the second coupling base material comprises the left substrate of the second coupling of sheet, substrate and the right substrate of the second coupling in the second coupling, described multiple the 4th artificial micro-structural be folded in the left substrate of the second coupling and second mate between substrate and in the second coupling substrate and second mate between right substrate.

Further, the thickness of described the first impedance matching layer lamella is 0.836mm, wherein, in the first coupling, the thickness of substrate is 0.4mm, the thickness of the first left coupling substrate and the right substrate of the first coupling is 0.2mm, be folded in the left substrate of the first coupling and first mate in multiple the 3rd artificial micro-structurals between substrate thickness and be folded in the thickness that substrate and first in the first coupling mates multiple the 3rd artificial micro-structurals between right substrate and be 0.018mm, the thickness of described the second impedance matching layer lamella is 0.836mm, wherein, in the second coupling, the thickness of substrate is 0.4mm, the thickness of the second left substrate of coupling and the right substrate of the second coupling is 0.2mm, be folded in the left substrate of the second coupling and second mate in multiple the 4th artificial micro-structurals between substrate thickness and be folded in the thickness that substrate and second in the second coupling mates multiple the 4th artificial micro-structurals between right substrate and be 0.018mm.

Further, the arbitrary longitudinal section of described super material flat-plate lens is of similar shape and area, and the operating frequency of described point focusing flat lens antenna is 8-12GHZ, and centre frequency is 10GHZ, wherein:

Feed equivalent point is 0.23m to the distance ss of the first flat-plate lens;

The first surpass the maximum radius r of sheet of material _maxfor 0.15m, the bore of described point focusing flat lens antenna is 0.3m;

Total number of stories m 1 of the first impedance matching layer lamella is 6;

The total number of plies that the first surpasses sheet of material is 18;

The first surpass the refractive index minimum value n of sheet of material _minbe 1.469;

The focal length d0 of the second flat-plate lens is 0.6m;

Total number of stories m 2 of the second impedance matching layer lamella is 4;

The total number of plies that the second surpasses sheet of material is 9;

The second surpass the refractive index maximum n of sheet of material _maxbe 4.2.

Further, the arbitrary longitudinal section of described super material flat-plate lens is of similar shape and area, and the operating frequency of described point focusing flat lens antenna is 8-12GHZ, and centre frequency is 10GHZ, wherein:

Feed equivalent point is 0.23m to the distance ss of the first flat-plate lens;

The first surpass the maximum radius r of sheet of material _maxfor 0.15m, the bore of described point focusing flat lens antenna is 0.3m;

The total number of plies that the first surpasses sheet of material is 21;

The first surpass the refractive index minimum value n of sheet of material _minbe 1.469;

The focal length d0 of the second flat-plate lens is 0.6m;

The total number of plies that the second surpasses sheet of material is 11;

The second surpass the refractive index maximum n of sheet of material _maxbe 4.2.

Further, the longitudinal section of described super material flat-plate lens is square, circular or oval.

Further, all metal micro structures for being made up of copper cash or silver-colored line of described the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural and the 4th artificial micro-structural, described metal micro structure is attached to respectively on the first base material, the second base material, the first coupling base material and the second coupling base material by etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method.

Further, described metal micro structure is plane flakes, described metal micro structure has the first metal wire and the second metal wire mutually vertically divided equally, described the first metal wire is identical with the length of the second metal wire, described the first metal wire two ends are connected with two the first metal branches of equal length, described the first metal wire two ends are connected on the mid point of two the first metal branches, described the second metal wire two ends are connected with two the second metal branches of equal length, described the second metal wire two ends are connected on the mid point of two the second metal branches, described the first metal branch and the second metal branch equal in length.

Further, on the inwall of described shell, be provided with absorbing material.

According to point focusing flat lens antenna of the present invention, conventional lenses part is replaced by surpassing material flat-plate lens, does not need machining shape complexity, the high curved surface of required precision, manufactures processing and is more prone to, and cost is cheaper.

Brief description of the drawings

Fig. 1 is the structural representation of the point focusing flat lens antenna of first embodiment of the invention;

Fig. 2 is the perspective diagram that the first surpasses one of them super material cell of sheet of material of the present invention;

Fig. 3 is the structural representation that the first surpasses sheet of material of the present invention;

Fig. 4 is the structural representation that the second surpasses sheet of material of the present invention;

Fig. 5 is the structural representation of the first matching layer lamella of the present invention;

Fig. 6 is the structural representation of the second matching layer lamella of the present invention;

Fig. 7 is the structural representation of the point focusing flat lens antenna of second embodiment of the invention;

Fig. 8 is the schematic diagram of the alabastrine metal micro structure of plane of the present invention;

Fig. 9 is a kind of derived structure of the alabastrine metal micro structure of plane shown in Fig. 8;

Figure 10 is a kind of distressed structure of the alabastrine metal micro structure of plane shown in Fig. 8.

Figure 11 is the first stage of the differentiation of the topology of the alabastrine metal micro structure of plane;

Figure 12 is the analogous diagram of the super material cell of refractive index minimum;

Figure 13 is the second stage of the differentiation of the topology of the alabastrine metal micro structure of plane;

Figure 14 is the analogous diagram of the super material cell of refractive index minimum.

Embodiment

As shown in Figures 1 to 6, the point focusing flat lens antenna providing for first embodiment of the invention, described point focusing flat lens antenna comprise a side opening shell 1, be arranged on the feed 2 of shell 1 opposite side and seal the super material flat-plate lens 1000 of described shell aperture K1, feed 2 is preferably horn antenna, as rectangular waveguide horn antenna or circular waveguide horn antenna, on the inwall of described shell 1, be provided with absorbing material 3, to absorb the electromagnetic wave of directive shell, feed is disturbed in the reflection of electromagnetic wave of anti-part here, and affects the performance of antenna.Absorbing material of the present invention can be the plate shaped absorbing material of individual layer being directly attached on outer casing inner wall; Also can be the absorbing material of bilayer or multi-layer planar shape, as Japanese NEC Corporation is dispersed in ferrite and broken-staple metal fibre in suitable organic polymer resin and makes composite material; Also the absorbing material of coating type, as lithium Cd ferrite coating, ferrospinel coating or ferrite add neoprene coating.Shell is traditional metal shell, and its material is preferably aluminium or aluminium alloy.

In the present embodiment, described super material flat-plate lens 1000 comprises near the first flat-plate lens 10 of feed 2 and second flat-plate lens 20 of fitting with the first flat-plate lens 10, described the first flat-plate lens 10 comprises the first core layer 11 and is arranged on first impedance matching layer 12 of the first core layer 11 near feed 2 one side surfaces, what described the first core layer 11 comprised that multiple thickness is identical and refraction index profile is identical the first surpasses sheet of material 110, the described sheet of material 110 that the first surpasses comprises the first base material 111 and is arranged on multiple the first artificial micro-structurals 112 on the first base material 111, described the second flat-plate lens 20 comprises the second core layer 21 and is arranged on second impedance matching layer 22 of the second core layer 21 away from feed 2 one side surfaces, what described the second core layer 21 comprised that multiple thickness is identical and refraction index profile is identical the second surpasses sheet of material 210, the described sheet of material 210 that the second surpasses comprises the second base material 211 and is arranged on multiple the second artificial micro-structurals (not indicating in figure) on the second base material 211, the described refraction index profile n that the first surpasses sheet of material 110 ₁(r) meet following formula:

$n_1\left(r\right)=n_{\min }+\frac{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="ss"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">ss</figure-callout>}}^2+{r_{\max }}^2}-\sqrt{{\mathrm{<figure-callout\; id="2"\; label="ss"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">ss</figure-callout>}}^2+r^2}}{d1}---\left(1\right);$

Wherein, n ₁(r) represent that the first surpassing radius in sheet of material 110 is the refractive index value at r place, this radius r represents on the first flat-plate lens 10 that any point is to the distance of the axis Z1 of the first flat-plate lens 10;

Ss is feed equivalent point (the X point in figure) to the distance of the first flat-plate lens 10 (in the present embodiment, ss is the distance of feed equivalent point X to the first impedance matching layer), the i.e. focal length of the first flat-plate lens 10, described feed equivalent point X is in the focus of the first flat-plate lens 10; The axis Z1 of the first flat-plate lens 10 overlaps with the axis Z2 of feed.

D1 is the thickness of the first flat-plate lens 10;

R _maxrepresent the first to surpass the maximum radius of sheet of material 110;

N _minrepresent the first to surpass the refractive index minimum value of sheet of material;

The described refraction index profile n that the second surpasses sheet of material 210 ₂(r) meet following formula:

$n_2\left(r\right)=n_{\max }-\frac{\sqrt{{\mathrm{<figure-callout\; id="0"\; label="d"\; filenames="HDA0000139692310000092.png,HDA0000139692310000102.png"\; state="\{\{state\}\}">d</figure-callout>}0}^2+r^2}-d0}{d2}---\left(2\right);$

Wherein, n ₂(r) represent that the second surpassing radius in sheet of material 210 is the refractive index value at r place, this radius r represents on the second flat-plate lens 20 that any point is to the distance of the axis of the second flat-plate lens 20; The axis of the second flat-plate lens 20 overlap with the axis Z1 of the first flat-plate lens 10 (the second flat-plate lens and the first flat-plate lens coaxially arrange).

D0 is the focal length of the second flat-plate lens 20; Focus is X2.

D2 is the thickness of the second flat-plate lens 20;

N _maxrepresent the second to surpass the refractive index maximum of sheet of material 210.

In the present embodiment, as shown in Figure 3, described the first base material 111 comprises substrate MB1 and the first right substrate RB1 in the first left substrate LB1, first of sheet, and described multiple the first artificial micro-structurals (not shown in Fig. 3) are folded in the first left substrate LB1 and first between substrate MB1 and in first between substrate MB1 and the first right substrate RB1.Preferably, the described thickness that the first surpasses sheet of material is 0.836mm, wherein, in first, the thickness of substrate is 0.4mm, the thickness of the first left substrate and the first right substrate is 0.2mm, and the thickness that is folded in the thickness of multiple the first artificial micro-structurals between substrate in the first left substrate and first and is folded in multiple the first artificial micro-structurals between substrate and the first right substrate in first is 0.018mm.

In the present embodiment, as shown in Figure 4, described the second base material 211 comprises substrate MB2 and the second right substrate RB2 in the second left substrate LB2, second of sheet, and described multiple the second artificial micro-structural (not shown)s are folded in the second left substrate LB2 and second between substrate MB2 and in second between substrate MB2 and the second right substrate RB2.Preferably, the described thickness that the second surpasses sheet of material is 0.836mm, wherein, in second, the thickness of substrate is 0.4mm, the thickness of the second left substrate and the second right substrate is 0.2mm, and the thickness that is folded in the thickness of multiple the second artificial micro-structurals between substrate in the second left substrate and second and is folded in multiple the second artificial micro-structurals between substrate and the second right substrate in second is 0.018mm.

In the present embodiment, as shown in Figure 5, described the first impedance matching layer 12 comprises the first impedance matching layer lamella 120 that multiple thickness is identical, described the first impedance matching layer lamella 120 comprises the first coupling base material 121 of sheet and is arranged on multiple the 3rd artificial micro-structural (not shown)s on the first coupling base material 121, the satisfied following formula of refraction index profile of described the first impedance matching layer lamella 120:

$n_{i1}\left(r\right)={n_{\min }}^{\frac{i1}{\mathrm{<figure-callout\; id="1"\; label="m"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">m</figure-callout>}1}}*n_1{\left(r\right)}^{\frac{m1-i1}{m1}}---\left(3\right);$

Wherein, m1 represents total number of plies of the first impedance matching layer lamella 120;

I1 represents the numbering of the first impedance matching layer lamella, near the first impedance matching layer lamella of the first core layer 100 be numbered 1, near the m1 that is numbered of the first impedance matching layer lamella of feed 2, increase successively to feed 2 directions numberings from the first core layer 100.

In the present embodiment, as shown in Figure 5, described the first coupling base material 121 comprises substrate P M1 and the right substrate P R1 of the first coupling in the left substrate P L1 of the first coupling, the first coupling of sheet, described multiple the 3rd artificial micro-structurals be folded in the left substrate P L1 of the first coupling and first mate between substrate P M1 and first mate in substrate P M1 and first mate between right substrate P R1.Preferably, the thickness of described the first impedance matching layer lamella is 0.836mm, wherein, in the first coupling, the thickness of substrate is 0.4mm, the thickness of the first left coupling substrate and the right substrate of the first coupling is 0.2mm, be folded in the left substrate of the first coupling and first mate in multiple the 3rd artificial micro-structurals between substrate thickness and be folded in the thickness that substrate and first in the first coupling mates multiple the 3rd artificial micro-structurals between right substrate and be 0.018mm.

In the present embodiment, as shown in Figure 6, described the second impedance matching layer 22 comprises the second impedance matching layer lamella 220 that multiple thickness is identical, described the second impedance matching layer lamella 220 comprises the second coupling base material 221 of sheet and is arranged on multiple the 4th artificial micro-structural (not shown)s on the second coupling base material 221, the satisfied following formula of refraction index profile of described the second impedance matching layer lamella 220:

$n_{i2}\left(r\right)={n_{\min }}^{\frac{i2}{\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA0000139692310000102.png"\; state="\{\{state\}\}">m</figure-callout>}2}}*n_2{\left(r\right)}^{\frac{m2-i2}{m2}}---\left(4\right);$

Wherein, m2 represents total number of plies of the second impedance matching layer lamella;

I2 represents the numbering of the second impedance matching layer lamella 220, be numbered 1 near the second impedance matching layer lamella 220 of the second core layer 200, near the m2 that is numbered of the second impedance matching layer lamella 220 of air, from the second core layer 200 to direction of air, numbering increases successively.

In the present embodiment, as shown in Figure 6, described the second coupling base material 221 comprises substrate P M2 and the right substrate P R2 of the second coupling in the left substrate P L2 of the second coupling, the second coupling of sheet, described multiple the 4th artificial micro-structurals 222 be folded in the left substrate P L2 of the second coupling and second mate between substrate P M2 and second mate in substrate P M2 and second mate between right substrate P R2.Preferably, the thickness of described the second impedance matching layer lamella is 0.836mm, wherein, in the second coupling, the thickness of substrate is 0.4mm, the thickness of the second left substrate of coupling and the right substrate of the second coupling is 0.2mm, be folded in the left substrate of the second coupling and second mate in multiple the 4th artificial micro-structurals between substrate thickness and be folded in the thickness that substrate and second in the second coupling mates multiple the 4th artificial micro-structurals between right substrate and be 0.018mm.

In the present embodiment, the arbitrary longitudinal section of described super material flat-plate lens is of similar shape and area, and longitudinal section herein refers to the section vertical with its axis in super material flat-plate lens.The longitudinal section of described super material flat-plate lens is square, circular or oval, and preferably, the longitudinal section of described super material flat-plate lens is circular, and the super material flat-plate lens obtaining is like this flat cylinder.

In the present embodiment, described point focusing flat lens antenna particularly, has following parameter:

The operating frequency of described point focusing flat lens antenna is 8-12GHZ, and centre frequency is 10GHZ;

Feed equivalent point X is 0.23m to the distance ss of the first flat-plate lens, and the X o'clock distance to the first impedance matching layer is 0.23m;

The first surpass the maximum radius r of sheet of material _maxfor 0.15m, the bore of described point focusing flat lens antenna is 0.3m;

Total number of stories m 1 of the first impedance matching layer lamella is 6, and every layer thickness is 0.836mm;

The total number of plies that the first surpasses sheet of material is 18, and the first core layer is made up of the super sheet of material of 18 layers, and every layer thickness is 0.836mm;

The first surpass the refractive index minimum value n of sheet of material _minbe 1.469;

The focal length d0 of the second flat-plate lens is 0.6m;

Total number of stories m 2 of the second impedance matching layer lamella is 4, and every layer thickness is 0.836mm;

The total number of plies that the second surpasses sheet of material is 9, and the second core layer is made up of the super sheet of material of 9 layers, and every layer thickness is 0.836mm;

The second surpass the refractive index maximum n of sheet of material _maxbe 4.2.

As shown in Figure 7, the point focusing flat lens antenna providing for second embodiment of the invention.Different from the first embodiment, in the present embodiment, described the first flat-plate lens 10 only comprises the first core layer 11, and described the second flat-plate lens 20 only comprises the second core layer 21.

In the present embodiment, the concrete parameter of described point focusing flat lens antenna is different, as follows:

In the present embodiment, the operating frequency of described point focusing flat lens antenna is 8-12GHZ, and centre frequency is 10GHZ;

Feed equivalent point X is 0.23m to the distance ss of the first flat-plate lens, and ss is herein the X o'clock distance to the first core layer, and in the first embodiment, is the X o'clock distance to the first impedance matching layer;

The first surpass the maximum radius r of sheet of material _maxfor 0.15m, the bore of described point focusing flat lens antenna is 0.3m;

The total number of plies that the first surpasses sheet of material is 21, and the first core layer is made up of the super sheet of material of 21 layers, every layer thickness 0.836mm;

The first surpass the refractive index minimum value n of sheet of material _minbe 1.469;

The focal length d0 of the second flat-plate lens is 0.6m;

The total number of plies that the second surpasses sheet of material is 11, and the second core layer is made up of the super sheet of material of 11 layers, every layer thickness 0.836mm; ;

The second surpass the refractive index maximum n of sheet of material _maxbe 4.2.

In the present invention, all metal micro structures for being made up of copper cash or silver-colored line of described the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural and the 4th artificial micro-structural, described metal micro structure is attached to respectively on the first base material, the second base material, the first coupling base material and the second coupling base material by etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method.Preferably, described the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural and the 4th artificial micro-structural are the alabastrine metal micro structure of the plane shown in Fig. 8 and develop by topology the metal micro structure of the multiple different topology obtaining.

The first surpassing sheet of material can obtain by the following method, the i.e. double-sided copper-clad of substrate in first, obtain multiple the first metal micro structures (shape of multiple the first metal micro structures with arrange obtain by Computer Simulation in advance) by etching method again, finally the first left substrate and the first right substrate are pressed together on respectively to both sides, obtain the sheet of material that the first surpasses of the present invention, the method of pressing can be direct hot pressing, also can be to utilize PUR to connect, certainly also other mechanical connection, for example bolt connects.

In like manner, the second surpassing sheet of material, the first matching layer lamella and the second matching layer lamella also can utilize identical method to obtain.Then respectively by multiplely the first surpassing sheet of material, the second surpass sheet of material, the first matching layer lamella and the second matching layer lamella and be integrally connected, formed respectively the first core layer of the present invention, the second core layer, the first impedance matching layer and the second impedance matching layer, the first core layer, the second core layer, the first impedance matching layer and the second impedance matching layer are integrally connected and obtain super material flat-plate lens of the present invention.

In the present invention, described the first base material, the second base material, the first coupling base material and the second coupling base material are made by ceramic material, macromolecular material, ferroelectric material, ferrite material or ferromagnetic material etc.Macromolecular material is available polytetrafluoroethylene, epoxy resin, F4B composite material, FR-4 composite material etc.For example, the electrical insulating property of polytetrafluoroethylene is very good, therefore can electromagnetic electric field not produced and be disturbed, and have good chemical stability, corrosion resistance, long service life.Preferably, in the present invention, the first left substrate LB1 of described the first base material adopts identical rigid foam plate with the first right substrate RB1, described the first base material first in substrate MB1 made by FR-4 composite material; Equally, in the present invention, the second left substrate LB2 of described the second base material adopts identical rigid foam plate with the second right substrate RB2, described the second base material second in substrate MB2 made by FR-4 composite material; Equally, in the present invention, the left substrate P L1 of the first coupling of described the first coupling base material adopts identical rigid foam plate with the right substrate P R1 of the first coupling, and in the first coupling of described the first coupling base material, substrate P M1 is made up of FR-4 composite material; Equally, in the present invention, the left substrate P L2 of the second coupling of described the second coupling base material adopts identical rigid foam plate with the right substrate P R2 of the second coupling, and in the second coupling of described the second coupling base material, substrate P M2 is made up of FR-4 composite material.The dielectric constant of the FR-4 composite material that the present invention adopts is 3.3, its base material refractive index of making is higher, therefore reduce the refractive index minimum value that the first surpasses sheet of material, the second surpasses sheet of material, the first matching layer lamella and the second matching layer lamella by rigid foam plate, to obtain suitable ranges of indices of refraction.

Figure 8 shows that the schematic diagram of the alabastrine metal micro structure of plane, described alabastrine metal micro structure has the first metal wire J1 and the second metal wire J2 that mutually vertically divide equally, described the first metal wire J1 is identical with the length of the second metal wire J2, described the first metal wire J1 two ends are connected with two the first F1 of metal branch of equal length, described the first metal wire J1 two ends are connected on the mid point of two the first F1 of metal branch, described the second metal wire J2 two ends are connected with two the second F2 of metal branch of equal length, described the second metal wire J2 two ends are connected on the mid point of two the second F2 of metal branch, described the first F1 of metal branch and the second F2's of metal branch is equal in length.

Fig. 9 is a kind of derived structure of the alabastrine metal micro structure of plane shown in Fig. 8.Its two ends at each the first F1 of metal branch and each the second F2 of metal branch are all connected with identical the 3rd F3 of metal branch, and the mid point of corresponding the 3rd F3 of metal branch is connected with the end points of the first F1 of metal branch and the second F2 of metal branch respectively.The rest may be inferred, and the present invention can also derive the metal micro structure of other form.

Figure 10 is a kind of distressed structure of the alabastrine metal micro structure of plane shown in Fig. 8, the metal micro structure of this kind of structure, the first metal wire J1 and the second metal wire J2 are not straight lines, but folding line, the first metal wire J1 and the second metal wire J2 are provided with two kink WZ, but the first metal wire J1 remains vertical with the second metal wire J2 to be divided equally, by arrange kink towards with the relative position of kink on the first metal wire and the second metal wire, make the metal micro structure shown in Figure 10 around all overlapping with former figure to the figure of any direction 90-degree rotation with the axis of the second metal wire intersection point perpendicular to the first metal wire.In addition, can also have other distortion, for example, the first metal wire J1 and the second metal wire J2 all arrange multiple kink WZ.

In the present invention, the described multiple super material cell D as shown in Figure 2 that the first surpass sheet of material 110 and be divided into array arrangement, each super material cell D comprises left base board unit U, right base board unit V and middle base board unit Y and is symmetricly set on two the first identical artificial micro-structurals 112 of middle base board unit Y two sides, conventionally the length, width and height of super material cell D are all not more than 1/5th wavelength, be preferably 1/10th wavelength, therefore, can determine the size of super material cell D according to the operating frequency of antenna.Fig. 2 is the technique of painting of perspective, to represent the first position of artificial micro-structural in super material cell D, as shown in Figure 2, described the first one of artificial micro-structural is sandwiched between left base board unit U and middle base board unit Y, another is sandwiched between right base board unit V and middle base board unit Y, and two the first surfaces, artificial micro-structural place represent with SR1 and SR2 respectively.

Known refractive index

wherein μ is relative permeability, and ε is relative dielectric constant, and μ and ε are collectively referred to as electromagnetic parameter.Experiment showed, when electromagnetic wave passes through refractive index dielectric material heterogeneous, can be to the large direction deviation of refractive index.In the situation that relative permeability is certain, (conventionally approach 1), refractive index is only relevant with dielectric constant, at the first base material selected in the situation that, utilize the arbitrary value (within the specific limits) that only can realize super material cell refractive index to first of electric field response the artificial micro-structural, under this point focusing lens antenna centre frequency (10GHZ), utilize simulation software, as CST, MATLAB etc., obtain the situation that the dielectric constant of the artificial micro-structural (the alabastrine metal micro structure of plane as shown in Figure 8) of a certain given shape changes along with the refractive index variable of topology by emulation, can list data one to one, what the specific refractive index that can design us needs distributed the first surpasses sheet of material 110, in like manner can obtain the second surpassing sheet of material, the refraction index profile of the first matching layer lamella and the second matching layer lamella, thereby obtain the refraction index profile of whole super material flat-plate lens 1000.

In the present invention, the structural design of the first super sheet of material can obtain by Computer Simulation (CST emulation), specific as follows:

(1) that determines the first metal micro structure adheres to base material (the first base material).During this is bright, the first left substrate LB1 of described the first base material adopts identical rigid foam plate with the first right substrate RB1, described rigid foam plate has a predetermined dielectric constant, described the first base material first in substrate MB1 be 3.3 by dielectric constant FR-4 composite material is made.

(2) size of definite super material cell.The size of the size of super material cell is obtained by the centre frequency of antenna, utilizes frequency to obtain its wavelength, then gets 1/5th a numerical value that is less than wavelength as length C D and the width KD of super material cell D.In the present invention, described super material cell D is that long CD and wide KD is as shown in Figure 2 the square platelet that 2.4mm, thickness HD are 0.836mm.

(3) determine material and the topological structure of metal micro structure.In the present invention, the material of metal micro structure is copper, and the topological structure of metal micro structure is the alabastrine metal micro structure of the plane shown in Fig. 8, and its live width W is consistent everywhere; Topological structure herein, refers to the basic configuration that topology develops.

(4) determine the topology parameter of metal micro structure.As shown in Figure 8, in the present invention, the topology parameter of the alabastrine metal micro structure of plane comprises the live width W of metal micro structure, the length a of the first metal wire J1, the length b of the first F1 of metal branch.

(5) determine the differentiation restrictive condition of the topology of metal micro structure.In the present invention, the differentiation restrictive condition of the topology of metal micro structure has, and as shown in Figure 8, the long limit of metal micro structure and super material cell or the distance of broadside are WL/2 to the minimum spacing WL(between metal micro structure), the live width W of metal micro structure, the size of super material cell; Due to processing technology restriction, WL is more than or equal to 0.1mm, and same, live width W is greater than to equal 0.1mm.In the present invention, WL gets 0.1mm, and W gets 0.3mm, and it is 2.4mm that super material cell is of a size of long and wide, and thickness is 0.836mm, and now the topology parameter of metal micro structure only has a and two variablees of b.The differentiation mode as shown in Figure 11 to 14 of passing through of the topology of metal micro structure, for example, corresponding to a certain characteristic frequency (10GHZ), can obtain a continuous variations in refractive index scope.

Particularly, the differentiation of the topology of described metal micro structure comprises two stages (basic configuration that topology develops is the metal micro structure shown in Fig. 8):

First stage: according to developing restrictive condition, in the situation that b value remains unchanged, a value is changed to maximum from minimum value, the metal micro structure in this evolution process is " ten " font (except when a gets minimum value).In the present embodiment, the minimum value of a is 0.3mm(live width W), the maximum of a is (CD-WL), i.e. 2.4-0.1mm, the maximum of a is 2.3mm.Therefore, in the first stage, the differentiation of the topology of metal micro structure as shown in figure 11, the square JX1 that is W from the length of side, develop into gradually maximum " ten " font topology JD1, in " ten " font topology JD1 of maximum, the first metal wire J1 and the second metal wire J2 length are 2.3mm, and width W is 0.3mm.In the first stage, along with the differentiation of the topology of metal micro structure, the refractive index of the super material cell corresponding with it increases (respective antenna one characteristic frequency) continuously, as shown in figure 12, in the time that frequency is 10GHZ, the minimum value n of refractive index corresponding to super material cell _minbe 1.469.

Second stage: according to developing restrictive condition, in the time that a is increased to maximum, a remains unchanged; Now, b is increased continuously to maximum from minimum value, the metal micro structure in this evolution process is plane flakes.In the present embodiment, the minimum value of b is 0.3mm(live width W), the maximum of b is (CD-WL-2W), i.e. 2.4-0.1-2*0.3mm, the maximum of b is 1.7mm.Therefore, in second stage, the differentiation of the topology of metal micro structure as shown in figure 13, from " ten " font topology JD1 of maximum, develop into gradually the alabastrine topology JD2 of maximum plane, the alabastrine topology JD2 of maximum plane herein refers to, the length b of the first J1 of metal branch and the second J2 of metal branch can not extend again, otherwise it is crossing that the first metal branch and the second metal branch will occur, and the maximum of b is 1.7mm.Now, the first metal wire and the second metal wire length are 2.3mm, and width is 0.3mm, and the length of the first metal branch and the second metal branch is 1.7mm, and width is 0.3mm.In second stage, along with the differentiation of the topology of metal micro structure, the refractive index of the super material cell corresponding with it increases (respective antenna one characteristic frequency) continuously, as shown in figure 12, in the time that frequency is 10GHZ, the maximum n of refractive index corresponding to super material cell _maxbe 4.2.

The variations in refractive index scope (1.469-4.2) that obtains super material cell by above-mentioned differentiation meets design needs.Do not meet design needs if above-mentioned differentiation obtains the variations in refractive index scope of super material cell, for example maximum is too little, changes WL and W, and emulation again, until obtain the variations in refractive index scope that we need.

According to formula (1), after a series of super material cell that emulation is obtained is arranged according to its corresponding refractive index, (being exactly in fact multiple the first artificial micro-structurals arranging on the first base material of different topology shape), can obtain the sheet of material that the first surpasses of the present invention.

In like manner, can obtain sheet of material, the first matching layer lamella and the second matching layer lamella of the second surpassing of the present invention.

By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, within these all belong to protection of the present invention.

Claims (13)

1. a point focusing flat lens antenna, it is characterized in that, described point focusing flat lens antenna comprises the shell of a side opening, be arranged on the feed of shell opposite side and seal the super material flat-plate lens of described shell aperture, described super material flat-plate lens comprises second flat-plate lens of fitting near the first flat-plate lens of feed and with the first flat-plate lens, described the first flat-plate lens comprises the first core layer, what described the first core layer comprised that multiple thickness is identical and refraction index profile is identical the first surpasses sheet of material, the described sheet of material that the first surpasses comprises the first base material and is arranged on multiple the first artificial micro-structurals on the first base material, described the second flat-plate lens comprises the second core layer, what described the second core layer comprised that multiple thickness is identical and refraction index profile is identical the second surpasses sheet of material, the described sheet of material that the second surpasses comprises the second base material and is arranged on multiple the second artificial micro-structurals on the second base material, described the second flat-plate lens and the first flat-plate lens coaxially arrange, the described refraction index profile n that the first surpasses sheet of material ₁(r) meet following formula:

$n_1\left(r\right)=n_{\min }+\frac{\sqrt{{\mathrm{ss}}^2+{r_{\max }}^2}-\sqrt{{\mathrm{ss}}^2+r^2}}{d1};$

Wherein, n ₁(r) represent that the first surpassing radius in sheet of material is the refractive index value at r place, this radius r represents on the first flat-plate lens that any point is to the distance of the axis of the first flat-plate lens;

Ss is the distance of feed equivalent point to the first flat-plate lens, i.e. the focal length of the first flat-plate lens, and described feed equivalent point is in the focus of the first flat-plate lens;

D1 is the thickness of the first flat-plate lens;

R _maxrepresent the first to surpass the maximum radius of sheet of material;

N _minrepresent the first to surpass the refractive index minimum value of sheet of material;

The described refraction index profile n that the second surpasses sheet of material ₂(r) meet following formula:

$n_2\left(r\right)=n_{\max }-\frac{\sqrt{{d0}^2+r^2}-d0}{d2};$

Wherein, n ₂(r) represent that the second surpassing radius in sheet of material is the refractive index value at r place, this radius r represents on the second flat-plate lens that any point is to the distance of the axis of the second flat-plate lens;

D0 is the focal length of the second flat-plate lens;

D2 is the thickness of the second flat-plate lens;

N _maxrepresent the second to surpass the refractive index maximum of sheet of material.

2. point focusing flat lens antenna as claimed in claim 1, it is characterized in that, described the first base material comprises substrate and the first right substrate in the first left substrate, first of sheet, described multiple the first artificial micro-structural is folded in the first left substrate and first between substrate and in first between substrate and the first right substrate, described the second base material comprises substrate and the second right substrate in the second left substrate, second of sheet, and described multiple the second artificial micro-structurals are folded in the second left substrate and second between substrate and in second between substrate and the second right substrate.

3. point focusing flat lens antenna as claimed in claim 2, it is characterized in that, the described thickness that the first surpasses sheet of material is 0.836mm, wherein, in first, the thickness of substrate is 0.4mm, the thickness of the first left substrate and the first right substrate is 0.2mm, the thickness that is folded in the thickness of multiple the first artificial micro-structurals between substrate in the first left substrate and first and is folded in multiple the first artificial micro-structurals between substrate and the first right substrate in first is 0.018mm, the described thickness that the second surpasses sheet of material is 0.836mm, wherein, in second, the thickness of substrate is 0.4mm, the thickness of the second left substrate and the second right substrate is 0.2mm, the thickness that is folded in the thickness of multiple the second artificial micro-structurals between substrate in the second left substrate and second and is folded in multiple the second artificial micro-structurals between substrate and the second right substrate in second is 0.018mm.

4. point focusing flat lens antenna as claimed in claim 3, it is characterized in that, described the first flat-plate lens also comprises and is arranged on first impedance matching layer of the first core layer near feed one side surface, described the first impedance matching layer comprises the first impedance matching layer lamella that multiple thickness is identical, described the first impedance matching layer lamella comprises the first coupling base material of sheet and is arranged on multiple the 3rd artificial micro-structurals on the first coupling base material, the satisfied following formula of refraction index profile of described the first impedance matching layer lamella:

$n_{i1}\left(r\right)={n_{\min }}^{\frac{i1}{m1}}*n_1{\left(r\right)}^{\frac{m1-i1}{m1}};$

Wherein, m1 represents total number of plies of the first impedance matching layer lamella;

I1 represents the numbering of the first impedance matching layer lamella, near the first impedance matching layer lamella of the first core layer be numbered 1, near the m1 that is numbered of the first impedance matching layer lamella of feed, from the first core layer to feed direction, numbering increases successively.

5. point focusing flat lens antenna as claimed in claim 4, it is characterized in that, described the second flat-plate lens also comprises and is arranged on second impedance matching layer of the second core layer away from feed one side surface, described the second impedance matching layer comprises the second impedance matching layer lamella that multiple thickness is identical, described the second impedance matching layer lamella comprises the second coupling base material of sheet and is arranged on multiple the 4th artificial micro-structurals on the second coupling base material, the satisfied following formula of refraction index profile of described the second impedance matching layer lamella:

$n_{i2}\left(r\right)={n_{\min }}^{\frac{i2}{m2}}*n_2{\left(r\right)}^{\frac{m2-i2}{m2}};$

Wherein, m2 represents total number of plies of the second impedance matching layer lamella;

I2 represents the numbering of the second impedance matching layer lamella, near the second impedance matching layer lamella of the second core layer be numbered 1, near the m2 that is numbered of the second impedance matching layer lamella of air, from the second core layer to direction of air, numbering increases successively.

6. point focusing flat lens antenna as claimed in claim 5, it is characterized in that, described the first coupling base material comprises the left substrate of the first coupling of sheet, substrate and the right substrate of the first coupling in the first coupling, described multiple the 3rd artificial micro-structural be folded in the left substrate of the first coupling and first mate between substrate and in the first coupling substrate and first mate between right substrate, described the second coupling base material comprises the left substrate of the second coupling of sheet, substrate and the right substrate of the second coupling in the second coupling, described multiple the 4th artificial micro-structural be folded in the left substrate of the second coupling and second mate between substrate and in the second coupling substrate and second mate between right substrate.

7. point focusing flat lens antenna as claimed in claim 6, it is characterized in that, the thickness of described the first impedance matching layer lamella is 0.836mm, wherein, in the first coupling, the thickness of substrate is 0.4mm, the thickness of the first left coupling substrate and the right substrate of the first coupling is 0.2mm, be folded in the left substrate of the first coupling and first mate in multiple the 3rd artificial micro-structurals between substrate thickness and be folded in the thickness that substrate and first in the first coupling mates multiple the 3rd artificial micro-structurals between right substrate and be 0.018mm, the thickness of described the second impedance matching layer lamella is 0.836mm, wherein, in the second coupling, the thickness of substrate is 0.4mm, the thickness of the second left substrate of coupling and the right substrate of the second coupling is 0.2mm, be folded in the left substrate of the second coupling and second mate in multiple the 4th artificial micro-structurals between substrate thickness and be folded in the thickness that substrate and second in the second coupling mates multiple the 4th artificial micro-structurals between right substrate and be 0.018mm.

8. point focusing flat lens antenna as claimed in claim 7, it is characterized in that, the arbitrary longitudinal section of described super material flat-plate lens is of similar shape and area, and the operating frequency of described point focusing flat lens antenna is 8-12GHZ, centre frequency is 10GHZ, wherein:

Feed equivalent point is 0.23m to the distance ss of the first flat-plate lens;

The first surpass the maximum radius r of sheet of material _maxfor 0.15m, the bore of described point focusing flat lens antenna is 0.3m;

Total number of stories m 1 of the first impedance matching layer lamella is 6;

The total number of plies that the first surpasses sheet of material is 18;

The first surpass the refractive index minimum value n of sheet of material _minbe 1.469;

The focal length d0 of the second flat-plate lens is 0.6m;

Total number of stories m 2 of the second impedance matching layer lamella is 4;

The total number of plies that the second surpasses sheet of material is 9;

The second surpass the refractive index maximum n of sheet of material _maxbe 4.2.

9. point focusing flat lens antenna as claimed in claim 3, it is characterized in that, the arbitrary longitudinal section of described super material flat-plate lens is of similar shape and area, and the operating frequency of described point focusing flat lens antenna is 8-12GHZ, centre frequency is 10GHZ, wherein:

Feed equivalent point is 0.23m to the distance ss of the first flat-plate lens;

The first surpass the maximum radius r of sheet of material _maxfor 0.15m, the bore of described point focusing flat lens antenna is 0.3m;

The total number of plies that the first surpasses sheet of material is 21;

The first surpass the refractive index minimum value n of sheet of material _minbe 1.469;

The focal length d0 of the second flat-plate lens is 0.6m;

The total number of plies that the second surpasses sheet of material is 11;

The second surpass the refractive index maximum n of sheet of material _maxbe 4.2.

10. point focusing flat lens antenna as claimed in claim 8 or 9, is characterized in that, the longitudinal section of described super material flat-plate lens is square, circular or oval.

11. point focusing flat lens antennas as claimed in claim 7, it is characterized in that, all metal micro structures for being made up of copper cash or silver-colored line of described the first artificial micro-structural, the second artificial micro-structural, the 3rd artificial micro-structural and the 4th artificial micro-structural, described metal micro structure is attached to respectively on the first base material, the second base material, the first coupling base material and the second coupling base material by etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method.

12. point focusing flat lens antennas as claimed in claim 11, it is characterized in that, described metal micro structure is plane flakes, described metal micro structure has the first metal wire and the second metal wire mutually vertically divided equally, described the first metal wire is identical with the length of the second metal wire, described the first metal wire two ends are connected with two the first metal branches of equal length, described the first metal wire two ends are connected on the mid point of two the first metal branches, described the second metal wire two ends are connected with two the second metal branches of equal length, described the second metal wire two ends are connected on the mid point of two the second metal branches, described the first metal branch and the second metal branch equal in length.

13. point focusing flat lens antennas as claimed in claim 1, is characterized in that, on the inwall of described shell, are provided with absorbing material.

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