CN202259696U - Feed-forward microwave antenna - Google Patents

Abstract

The utility model discloses a feed-forward microwave antenna, which comprises a radiation source, a first metamaterial panel used for diffusing electromagnetic waves emitted by the radiation source, a second metamaterial panel and a reflection panel attached to the back side of the second metamaterial panel. After being emitted by the first metamaterial panel, the electromagnetic waves enter the second metamaterial panel to be refracted and are reflected by the reflection panel, then enter the second metamaterial panel again to be refracted and finally are emitted out in parallel mode. The antenna is made by adopting the metamaterial principle so that the antenna breaks away from limit of the traditional convex lens shape, the concave lens shape and the paraboloid shape. The feed-forward microwave antenna can be in a flat plate shape or any shape, is thinner in thickness, smaller in volume and more convenient to process and manufacture, and has the advantages of being low in cost and good in gain effect.

Description

A kind of feed forward type microwave antenna

Technical field

The utility model relates to field of antenna, more particularly, relates to a kind of feed forward type microwave antenna.

Background technology

Existing feed forward type microwave antenna, radiation source usually parabolic by metal and that be positioned at the metal parabolic focus constitutes, and metal is paraboloidal to be act as the reflection of electromagnetic wave of outside is given radiation source or the reflection of electromagnetic wave of radiation source emission is gone out.Paraboloidal area of metal and the paraboloidal machining accuracy of metal directly determine the parameters of microwave antenna, for example gain, directivity etc.

But there is following shortcoming in existing feed forward type microwave antenna: the one, and partly can be stopped from the electromagnetic wave of metal parabolic reflector and to cause the certain energy loss by radiation source, the 2nd, the parabolic difficulty of making of metal, cost is higher.The metal parabola utilizes die casting and molding usually or adopts Digit Control Machine Tool to carry out method for processing.The technological process of first method comprises: make parabolic mould, casting parabola and carry out the installation of parabolic reflector.The technology more complicated, cost is high, and paraboloidal shape will the more accurate direction propagation that could realize antenna, so to the requirement of machining accuracy also than higher.Second method adopts large-size numerical control machine to carry out paraboloidal processing, through edit routine, and path that cutter is walked in the control Digit Control Machine Tool, thus cut out required parabolic shape.This method cutting is very accurate, but makes relatively difficulty of this large-size numerical control machine, and cost is than higher.

The utility model content

The technical problem that the utility model will solve is, to the above-mentioned deficiency of prior art, provides that a kind of volume is less, with low cost, gain is higher and the feed forward type microwave antenna of long transmission distance.

The utility model solves the technical scheme that its technical problem adopted: propose a kind of feed forward type microwave antenna; Comprise: radiation source, be used for the first surpassing material panel, the second surpassing material panel and be attached at the said Reflector Panel that the second surpasses the material panel back what the electromagnetic wave of said radiation source emission was dispersed, electromagnetic wave is dispersed the back and is got into the said material panel that the second surpasses and produce refraction and got into the said material panel that the second surpasses after the said Reflector Panel reflection once more refraction and final parallel outgoing take place once more through the said material panel that the first surpasses; The said material panel that the first surpasses comprises that first base material and cycle are arranged in a plurality of third party's pore-creating structures in said first base material; The said material panel that the second surpasses comprises core layer; Said core layer comprises a plurality of ultra sheet of material of core with identical refraction index profile, the rounded distribution of refractive index of the ultra sheet of material of said core, and the refractive index of circle centre position is maximum; Along with the increase of radius, refractive index is from n _pBe reduced to n continuously ₀And the refractive index at same radius place is identical; The ultra sheet of material of said core comprises that base material and cycle are arranged in a plurality of the first pore-creating structure in the ultra sheet of material base material of said core.

Further, the said material panel that the second surpasses also comprises the ultra sheet of material of ultra sheet of material to the N of first gradual change gradual change that is arranged at said core layer front side, and wherein the ultra sheet of material of N gradual change is near said core layer; The all rounded distribution of the ultra sheet of material refractive index of each gradual change, and the refractive index of circle centre position is its largest refractive index, and along with the increase of radius, refractive index is reduced to n gradually from its largest refractive index ₀And the refractive index at same radius place is identical, and the largest refractive index of two adjacent ultra sheet of material of gradual change is expressed as n _iAnd n _I+1, n wherein ₀＜n _i＜n _I+1＜n _p, i is a positive integer, n _iLargest refractive index value corresponding to the said core layer of the distance ultra sheet of material of gradual change far away; The ultra sheet of material of said each gradual change comprises that base material and cycle are arranged in a plurality of second artificial pore structure of said substrate surface.

Further, the said material panel that the second surpasses also comprises first matching layer to the M matching layer that is arranged at the ultra sheet of material of said first gradual change front side, and wherein the M matching layer is near the ultra sheet of material of said first gradual change; Each matching layer refraction index profile is even; The said first matching layer refractive index near free space is substantially equal to the free space refractive index, is substantially equal to the ultra sheet of material minimum refractive index of said first gradual change n near the M matching layer refractive index of the ultra sheet of material of said first gradual change ₀

Further, ultra sheet of material of each gradual change and of the variation of the ultra sheet of material of all cores along with radius r, the refraction index profile relational expression is:

$n\left(r\right)=n_{\max }-2*\frac{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="ss"\; filenames="HDA0000078436140000011.png"\; state="\{\{state\}\}">ss</figure-callout>}}^2+r^2}-\mathrm{<figure-callout\; id="2"\; label="ss\; ss"\; filenames="HDA0000078436140000011.png"\; state="\{\{state\}\}">ss</figure-callout>}}{\sqrt{{\mathrm{ss}}^{}}}*(n_{\max }-n_0)$

Wherein, n _MaxRepresent the largest refractive index value that each ultra sheet of material has, n ₀Represent the identical minimum refractive index value that each ultra sheet of material has, ss representes the vertical range of radiation source apart from the ultra sheet of material of first gradual change, and l representes the identical maximum radius value that each ultra sheet of material has.

Further; Be filled with the medium of refractive index in the said the first pore-creating structure less than the ultra sheet of material base material of core refractive index; The rule of arranging that cycle is arranged in a plurality of said the first pore-creating structure in the base material of the ultra sheet of material of said core is: said each the first pore-creating structure and the ultra sheet of material base material of its shared part core have constituted the elementary cell of the ultra sheet of material of said core; The rounded distribution on the ultra sheet of material base material of said core of the elementary cell of the ultra sheet of material of said core; The first pore-creating structural volume on the elementary cell of the ultra sheet of material of core of circle centre position is minimum; Along with the increase of radius, the first pore-creating structural volume that the first pore-creating structural volume on the elementary cell of the ultra sheet of material of core of respective radii becomes on the elementary cell of the ultra sheet of material of core at big and same radius place is identical.

Further; Be filled with the medium of refractive index in the said second artificial pore structure less than the ultra sheet of material base material of gradual change refractive index; The rule of arranging that cycle is arranged in the said second artificial pore structure in the ultra sheet of material base material of said gradual change is: said each second artificial pore structure and the ultra sheet of material base material of its shared part gradual change have constituted the elementary cell of the ultra sheet of material of said gradual change; The rounded distribution on the ultra sheet of material base material of said gradual change of the elementary cell of the ultra sheet of material of said gradual change; The second artificial pore structure volume on the elementary cell of the ultra sheet of material of gradual change of circle centre position is minimum; Along with the increase of radius, the second artificial pore structure volume that the second artificial pore structure volume on the elementary cell of the ultra sheet of material of gradual change of respective radii becomes on the elementary cell of the ultra sheet of material of gradual change at big and same radius place is identical.

Further, saidly the first surpass the rounded distribution of material panel refractive index, the refractive index of circle centre position is minimum and along with the increase of radius, the refractive index of respective radii also increase and same radius place refractive index identical.

Further, the said material panel that the first surpasses is made up of the identical sheet of material that the first surpasses of a plurality of refraction index profile; Be filled with the medium of refractive index in said third party's pore-creating structure less than the first base material refractive index; The rule of arranging that cycle is arranged in the said third party's pore-creating structure in said first base material is: said each third party's pore-creating structure has constituted the said elementary cell that the first surpasses material panel with its shared part first base material; The said elementary cell rounded distribution on said first base material that the first surpasses sheet of material; Third party's pore-creating structural volume on the elementary cell that the first surpasses sheet of material of circle centre position is maximum; Along with the increase of radius, third party's pore-creating structural volume of respective radii also increase and third party's pore-creating structural volume at same radius place identical.

Further, said medium is an air.

Further, the wave frequency of said radiation source emission is that the 12.4G hertz is to the 18G hertz.

Implement the technical scheme of the utility model; Have following beneficial effect: through design on ultra material panel core layer and the graded bedding and separately between variations in refractive index convert the electromagnetic wave of radiation source emission into plane wave after through twice refraction; Thereby improved the performance that converges of antenna, significantly reduced reflection loss, also just avoided the minimizing of electromagnetic energy; Strengthen transmission range, improved antenna performance.Further; The utility model also has the ultra material of dispersing function in the setting of radiation source leading portion; Thereby improve the closely radiation scope of radiation source, make size that feed forward type microwave antenna integral body can be littler and make the electromagnetic wave that is reflected by core layer walk around radiation source and can not produce the radiation source shade, cause energy loss.Further, the utility model adopts artificial pore structure to constitute ultra material, has technology beneficial effect simple, with low cost.

Description of drawings

To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:

Fig. 1 is the perspective view that constitutes the elementary cell of ultra material;

Fig. 2 is the structural representation of the utility model feed forward type microwave antenna;

Fig. 3 constitutes the structural representation that the first surpasses sheet of material that the first surpasses material panel in the utility model feed forward type microwave antenna;

Fig. 4 is the perspective view that the second surpasses material panel in the utility model feed forward type microwave antenna;

Fig. 5 is for the second surpassing the cutaway view of the matching layer of material panel in the utility model feed forward type microwave antenna.

Embodiment

Light, as electromagnetic a kind of, it is when passing glass; Because the wavelength of light is much larger than the size of atom; Therefore we can use the univers parameter of glass, and the details parameter of the atom of for example refractive index, rather than composition glass is described the response of glass to light.Accordingly, when research material was to other electromagnetic responses, any yardstick also can be used the univers parameter of material much smaller than the structure of electromagnetic wavelength to electromagnetic response in the material, and for example DIELECTRIC CONSTANTS and magnetic permeability μ describe.Thereby the structure through every of designing material makes all identical with magnetic permeability or different dielectric constant that makes material monolithic of the dielectric constant of material each point and magnetic permeability be certain rule and arranges; Magnetic permeability that rule is arranged and dielectric constant can make material that electromagnetic wave is had the response on the macroscopic view, for example converge electromagnetic wave, divergent electromagnetic ripple etc.Such have magnetic permeability that rule arranges and dielectric constant material we be referred to as ultra material.

As shown in Figure 1, Fig. 1 is the perspective view of the elementary cell of the ultra material of formation.The artificial pore structure 1 that the elementary cell of ultra material comprises base material 2 and in base material 2, forms.In base material 2, form artificial pore structure 1 and make base material 2 every dielectric constant and magnetic permeabilitys different and different along with artificial pore structure volume, thereby each ultra material elementary cell has different electromagnetic responses to the incident wave of same frequency.A plurality of ultra material elementary cells are arranged according to certain rules and can be made ultra material electromagnetic wave had the response of macroscopic view.Because ultra material monolithic needs have macroscopical electromagnetic response so each ultra material elementary cell need form continuous response to the response of incident electromagnetic wave to incident electromagnetic wave; This requires each ultra material elementary cell to be of a size of 1/10th to 1/5th of incident electromagnetic wave, is preferably 1/10th of incident electromagnetic wave.During this section is described; The material monolithic that will surpass that we are artificial is divided into a plurality of ultra material elementary cells; But it is convenient to know that this kind division methods is merely description; Should not regard ultra material as by a plurality of ultra material elementary cells splicings or assemble, ultra material is that the artificial pore structure cycle is arranged in the base material and can constitutes in the practical application, and technology is simple and with low cost.Cycle arranges and promptly refers to can produce continuous electromagnetic response to incident electromagnetic wave on above-mentioned our artificial each ultra material elementary cell of dividing.

As shown in Figure 2, Fig. 2 is the structural representation of the utility model feed forward type microwave antenna.Among Fig. 2; The utility model feed forward type microwave antenna comprise radiation source 20, the first surpass material panel 30, the second surpass material panel 10 and be positioned at the Reflector Panel 40 that the second surpasses material panel 10 backs; In the utility model, the wave frequency of radiation source 20 emissions is that the 12.4G hertz is to the 18G hertz.

The first surpass on the radiation port that material panel 30 can directly be attached at radiation source 20; But; The electromagnetic wave of radiation source 20 radiation partly can the first be surpassed material panel 30 reflections and caused energy loss in the time of on the first surpassing the radiation port that material panel 30 directly is attached at radiation source 20; Therefore in the utility model, the first surpass material panel 30 and be arranged at radiation source 20 the place aheads.The first surpassing material panel 30 is made up of the identical sheet of material 300 that the first surpasses of multi-disc refraction index profile; As shown in Figure 3; Fig. 3 is the perspective view that the first surpasses sheet of material 300, the first surpasses sheet of material 300 and comprises that first base material 301 and cycle are arranged in a plurality of third party's pore-creating structures 302 in first base material.

It is still as shown in Figure 1 to constitute the elementary cell that the first surpasses sheet of material 300, but the first surpasses the function that sheet of material 300 need have the divergent electromagnetic ripple, and according to the electromagnetism principle, electromagnetic wave is to the big direction deviation of refractive index.Therefore, the variations in refractive index rule that the first surpasses on the sheet of material 300 is: the first surpass the rounded distribution of sheet of material 300 refractive indexes, the refractive index of circle centre position is minimum and along with the increase of radius, the refractive index of respective radii also increase and same radius place refractive index identical.The electromagnetic wave that sheet of material 300 makes radiation source 20 radiate that the first surpasses with such refraction index profile is dispersed; Thereby improve the closely radiation scope of radiation source; Make the size that feed forward type microwave antenna integral body can be littler, and can make that the electromagnetic wave that the face of being reflected reflects is not out blocked by radiation source.

More specifically, in the utility model, the refraction index profile rule that the first surpasses on the sheet of material 300 can be linear change, i.e. n _(R)=n _Min+ KR, K are constant, and R is the ultra material elementary cell central point that is formed with third party's pore-creating structure of circular distribution and the line distance of the first base material central point, n _MinIt is the refractive index value that the first base material central point is had.In addition, the refraction index profile rule that the first surpasses on the sheet of material 300 also can be square law variation, i.e. n _(R)=n _Min+ KR ²Or be that a cube rate variation is n _(R)=n _Min+ KR ³Or be dark function, i.e. n _(R)=n _Min* K ^RDeng.Can know by the above-mentioned variation formula that the first surpasses sheet of material 300, as long as the first surpass the electromagnetic wave that sheet of material 300 satisfies the divergent radiation source emission.

Describe the utility model feed forward type microwave antenna below in detail and the second surpass material panel.The second surpassing material panel will converge the back and make the sphere electromagnetic wave of dispersing radiate with the plane electromagnetic wave that is more suitable for long-distance transmissions via the first surpassing electromagnetic wave that material panel disperses.As shown in Figure 4, Fig. 4 the second surpasses the perspective view of material panel for the utility model.Among Fig. 4, the second surpass material panel 10 and comprise core layer, this core layer is made up of the ultra sheet of material 11 of the identical core of a plurality of refraction index profile; The ultra sheet of material 101 of first gradual change that is arranged at the core layer front side is to the ultra sheet of material of N gradual change, and the ultra sheet of material of gradual change is the ultra sheet of material of first gradual change 101, the ultra sheet of material 102 of second gradual change and the ultra sheet of material 103 of the 3rd gradual change in the present embodiment; First matching layer 111 that is arranged at the ultra sheet of material of first gradual change 101 front sides is to the M matching layer; Each matching layer refraction index profile evenly and near first matching layer, 111 refractive indexes of free space is substantially equal to the free space refractive index, is substantially equal to the refractive index of ultra sheet of material 101 minimums of this first gradual change near last one deck matching layer refractive index of the ultra sheet of material of first gradual change.Ultra sheet of material of gradual change and matching layer all have and reduce electromagnetic reflection, and play the effect of impedance matching and phase compensation, so the ultra sheet of material of gradual change and matching layer are set is execution mode more preferably.

In the present embodiment, matching layer is made up of the lamella with cavity 1111, and the volume of cavity makes that more greatly the refractive index of lamella is more little, and the volume through cavity gradually changes and makes the refractive index of each matching layer gradually change.The cutaway view of matching layer is as shown in Figure 5.

The elementary cell that constitutes ultra sheet of material of core and the ultra sheet of material of gradual change is all as shown in Figure 1.

Ultra sheet of material of core and all rounded distribution of the ultra sheet of material of gradual change, the refractive index of circle centre position is maximum, along with the refractive index of the increase respective radii of radius reduce and the refractive index at same radius place identical.Wherein the largest refractive index that has of the ultra sheet of material of core is n _p, the largest refractive index of two adjacent ultra sheet of material of gradual change is n _iAnd n _I+1, n _iCorresponding to the said core layer of the distance ultra sheet of material of gradual change far away, n _p, n ₀, n _i, n _I+1Satisfy relational expression n ₀＜n _i＜n _I+1＜n _pThe refraction index profile that has the ultra material elementary cell of same radius r on concrete each layer of the functional layer that is made up of ultra sheet of material of core and the ultra sheet of material of gradual change satisfies:

$n\left(r\right)=n_{\max }-2*\frac{\sqrt{{\mathrm{<figure-callout\; id="2"\; label="ss"\; filenames="HDA0000078436140000011.png"\; state="\{\{state\}\}">ss</figure-callout>}}^2+r^2}-\mathrm{<figure-callout\; id="2"\; label="ss\; ss"\; filenames="HDA0000078436140000011.png"\; state="\{\{state\}\}">ss</figure-callout>}}{\sqrt{{\mathrm{ss}}^{}}}*(n_{\max }-n_0)$

n _MaxRepresent the largest refractive index value that each ultra sheet of material has, n ₀Represent the identical minimum refractive index value that each ultra sheet of material has, ss representes the vertical range of radiation source apart from the ultra sheet of material of first gradual change, and l representes the identical maximum radius value that each ultra sheet of material has.

Discussed the overall refractive index distribution relation that the first surpasses material panel and the second surpass material panel above in detail, can have been known by ultra material principle, the volume of the artificial pore structure in the base material directly determines the refractive index value of ultra material each point.Simultaneously, can know according to experiment that when being filled with refractive index less than the medium of base material in the artificial pore structure, the volume of artificial pore structure is big more, the refractive index of the ultra material elementary cell that it is corresponding is more little.In the utility model; Constituting third party's pore-creating structure on the sheet of material rule of arranging that the first surpasses the first surpass material panel is: be filled with the medium of refractive index less than the first base material refractive index in said third party's pore-creating structure; Said each third party's pore-creating structure has constituted the said elementary cell that the first surpasses material panel with its shared part first base material; The said elementary cell rounded distribution on said first base material that the first surpasses sheet of material; Third party's pore-creating structural volume on the elementary cell that the first surpasses sheet of material of circle centre position is maximum; Along with the increase of radius, third party's pore-creating structural volume of respective radii also increase and third party's pore-creating structural volume at same radius place identical.The rule of arranging of the second artificial pore structure on the ultra sheet of material of gradual change is: be filled with the medium of refractive index less than the ultra sheet of material base material of gradual change refractive index in the said second artificial pore structure; Said each second artificial pore structure and the ultra sheet of material base material of its shared part gradual change have constituted the elementary cell of the ultra sheet of material of said gradual change; The rounded distribution on the ultra sheet of material base material of said gradual change of the elementary cell of the ultra sheet of material of said gradual change; The second artificial pore structure volume on the elementary cell of the ultra sheet of material of gradual change of circle centre position is minimum; Along with the increase of radius, the second artificial pore structure volume that the second artificial pore structure volume on the elementary cell of the ultra sheet of material of gradual change of respective radii becomes on the elementary cell of the ultra sheet of material of gradual change at big and same radius place is identical.The first pore-creating structure on the ultra sheet of material of the core rule of arranging is: be filled with the medium of refractive index less than the ultra sheet of material base material of core refractive index in the said the first pore-creating structure; Said each the first pore-creating structure and the ultra sheet of material base material of its shared part core have constituted the elementary cell of the ultra sheet of material of said core; The rounded distribution on the ultra sheet of material base material of said core of the elementary cell of the ultra sheet of material of said core; The first pore-creating structural volume on the elementary cell of the ultra sheet of material of core of circle centre position is minimum; Along with the increase of radius, the first pore-creating structural volume that the first pore-creating structural volume on the elementary cell of the ultra sheet of material of core of respective radii becomes on the elementary cell of the ultra sheet of material of core at big and same radius place is identical.The refractive index of filling in above-mentioned the first pore-creating structure, the second artificial pore structure and the third party's pore-creating structure is an air less than the medium of each base material refractive index.

Can imagine ground, when the refractive index of filling medium in the first pore-creating structure, the second artificial pore structure or the third party's pore-creating structure during greater than the base material refractive index, the volume of each one pore-creating and the above-mentioned rule of arranging get final product on the contrary.

Satisfy and above-mentionedly the first surpass material panel and the second surpass the shape of the artificial pore structure that the material panel refraction index profile requires and unrestricted, as long as the volume of its occupied ultra material elementary cell satisfies the above-mentioned rule of arranging.Simultaneously, also can be formed with the identical artificial pore structure of a plurality of volumes in each ultra material elementary cell, need make that all artificial pore volume sums satisfy the above-mentioned rule of arranging on each ultra material elementary cell this moment.

Combine accompanying drawing that the embodiment of the utility model is described above; But the utility model is not limited to above-mentioned embodiment, and above-mentioned embodiment only is schematically, rather than restrictive; Those of ordinary skill in the art is under the enlightenment of the utility model; Not breaking away under the scope situation that the utility model aim and claim protect, also can make a lot of forms, these all belong within the protection of the utility model.

Claims (10)

1. feed forward type microwave antenna; It is characterized in that; Comprise: radiation source, be used for the first surpassing material panel, the second surpassing material panel and be attached at the said Reflector Panel that the second surpasses the material panel back what the electromagnetic wave of said radiation source emission was dispersed, electromagnetic wave is dispersed the back and is got into the said material panel that the second surpasses and produce refraction and got into the said material panel that the second surpasses after the said Reflector Panel reflection once more refraction and final parallel outgoing take place once more through the said material panel that the first surpasses; The said material panel that the first surpasses comprises that first base material and cycle are arranged in a plurality of third party's pore-creating structures in said first base material; The said material panel that the second surpasses comprises core layer; Said core layer comprises a plurality of ultra sheet of material of core with identical refraction index profile, the rounded distribution of refractive index of the ultra sheet of material of said core, and the refractive index of circle centre position is maximum; Along with the increase of radius, refractive index is from n _pBe reduced to n continuously ₀And the refractive index at same radius place is identical; The ultra sheet of material of said core comprises that base material and cycle are arranged in a plurality of the first pore-creating structure in the ultra sheet of material base material of said core.

2. feed forward type microwave antenna according to claim 1; It is characterized in that; The said material panel that the second surpasses also comprises the ultra sheet of material of ultra sheet of material to the N of first gradual change gradual change that is arranged at said core layer front side, and wherein the ultra sheet of material of N gradual change is near said core layer; The all rounded distribution of the ultra sheet of material refractive index of each gradual change, and the refractive index of circle centre position is its largest refractive index, and along with the increase of radius, refractive index is reduced to n gradually from its largest refractive index ₀And the refractive index at same radius place is identical, and the largest refractive index of two adjacent ultra sheet of material of gradual change is expressed as n _iAnd n _I+1, n wherein ₀＜n _i＜n _I+1＜n _p, i is a positive integer, n _iLargest refractive index value corresponding to the said core layer of the distance ultra sheet of material of gradual change far away; The ultra sheet of material of said each gradual change comprises that base material and cycle are arranged in a plurality of second artificial pore structure of said substrate surface.

3. feed forward type microwave antenna according to claim 2; It is characterized in that; The said material panel that the second surpasses also comprises first matching layer to the M matching layer that is arranged at the ultra sheet of material of said first gradual change front side, and wherein the M matching layer is near the ultra sheet of material of said first gradual change; Each matching layer refraction index profile is even; The said first matching layer refractive index near free space is substantially equal to the free space refractive index, is substantially equal to the ultra sheet of material minimum refractive index of said first gradual change n near the M matching layer refractive index of the ultra sheet of material of said first gradual change ₀

4. feed forward type microwave antenna according to claim 2 is characterized in that, ultra sheet of material of each gradual change and of the variation of the ultra sheet of material of all cores along with radius r, and the refraction index profile relational expression is:

$n\left(r\right)=n_{\max }-2*\frac{\sqrt{{\mathrm{ss}}^2+r^2}-\mathrm{ss}}{\sqrt{{\mathrm{ss}}^2+l^2-\mathrm{ss}}}*(n_{\max }-n_0)$

Wherein, n _MaxRepresent the largest refractive index value that each ultra sheet of material has, n ₀Represent the identical minimum refractive index value that each ultra sheet of material has, ss representes the vertical range of radiation source apart from the ultra sheet of material of first gradual change, and l representes the identical maximum radius value that each ultra sheet of material has.

5. feed forward type microwave antenna according to claim 4; It is characterized in that; Be filled with the medium of refractive index in the said the first pore-creating structure less than the ultra sheet of material base material of core refractive index; The rule of arranging that cycle is arranged in a plurality of said the first pore-creating structure in the base material of the ultra sheet of material of said core is: said each the first pore-creating structure and the ultra sheet of material base material of its shared part core have constituted the elementary cell of the ultra sheet of material of said core; The rounded distribution on the ultra sheet of material base material of said core of the elementary cell of the ultra sheet of material of said core; The first pore-creating structural volume on the elementary cell of the ultra sheet of material of core of circle centre position is minimum; Along with the increase of radius, the first pore-creating structural volume that the first pore-creating structural volume on the elementary cell of the ultra sheet of material of core of respective radii becomes on the elementary cell of the ultra sheet of material of core at big and same radius place is identical.

6. feed forward type microwave antenna according to claim 4; It is characterized in that; Be filled with the medium of refractive index in the said second artificial pore structure less than the ultra sheet of material base material of gradual change refractive index; The rule of arranging that cycle is arranged in the said second artificial pore structure in the ultra sheet of material base material of said gradual change is: said each second artificial pore structure and the ultra sheet of material base material of its shared part gradual change have constituted the elementary cell of the ultra sheet of material of said gradual change; The rounded distribution on the ultra sheet of material base material of said gradual change of the elementary cell of the ultra sheet of material of said gradual change; The second artificial pore structure volume on the elementary cell of the ultra sheet of material of gradual change of circle centre position is minimum; Along with the increase of radius, the second artificial pore structure volume that the second artificial pore structure volume on the elementary cell of the ultra sheet of material of gradual change of respective radii becomes on the elementary cell of the ultra sheet of material of gradual change at big and same radius place is identical.

7. feed forward type microwave antenna according to claim 1; It is characterized in that; Saidly the first surpass the rounded distribution of material panel refractive index, the refractive index of circle centre position is minimum and along with the increase of radius, the refractive index of respective radii also increase and same radius place refractive index identical.

8. feed forward type microwave antenna according to claim 7 is characterized in that, the said material panel that the first surpasses is made up of the identical sheet of material that the first surpasses of a plurality of refraction index profile; Be filled with the medium of refractive index in said third party's pore-creating structure less than the first base material refractive index; The rule of arranging that cycle is arranged in the said third party's pore-creating structure in said first base material is: said each third party's pore-creating structure has constituted the said elementary cell that the first surpasses material panel with its shared part first base material; The said elementary cell rounded distribution on said first base material that the first surpasses sheet of material; Third party's pore-creating structural volume on the elementary cell that the first surpasses sheet of material of circle centre position is maximum; Along with the increase of radius, third party's pore-creating structural volume of respective radii also increase and third party's pore-creating structural volume at same radius place identical.

9. according to claim 5,6 or 8 described feed forward type microwave antennas, it is characterized in that said medium is an air.

10. feed forward type microwave antenna according to claim 1 is characterized in that, the wave frequency of said radiation source emission is that the 12.4G hertz is to the 18G hertz.

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