CN102544704B - Wireless local area network (WLAN) network bridge antenna - Google Patents
Wireless local area network (WLAN) network bridge antenna Download PDFInfo
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- CN102544704B CN102544704B CN201110331114.0A CN201110331114A CN102544704B CN 102544704 B CN102544704 B CN 102544704B CN 201110331114 A CN201110331114 A CN 201110331114A CN 102544704 B CN102544704 B CN 102544704B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/007—Details of, or arrangements associated with, antennas specially adapted for indoor communication
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
Abstract
The invention discloses a wireless local area network (WLAN) network bridge antenna, which comprises a casing with an opening on one side, a feed source arranged on the other side of the casing and a metamaterial for closing the opening of the casing. The feed source and the metamaterial are coaxially arranged, the metamaterial is formed by a plurality of metamaterial sheet layers with the same thickness and the same refractive index distribution, each metamaterial sheet layer comprises a base material and a plurality of artificial microstructures periodically arranged on the base material, a conical reflection surface is arranged on the metamaterial at the position right facing to the feed source, and the refractive index distribution of the metamaterial sheet layers is obtained through an initial phase method. The refractive index distribution of the metamaterial sheet layers is obtained through the initial phase method, the computational process of the refractive index distribution is easy to be programmed and coded, and after codes are formed, users only need to master usage of the codes. Therefore, the WLAN network bridge antenna is convenient to popularize in a large scale, and the WLAN network bridge antenna added with the metamaterial is thinned, lightened in weight and greatly enhanced in directivity and is low in loss and high in gain.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of WLAN bridge antenna.
Background technology
WLAN bridge has been abandoned traditional copper cash or optical fiber, utilizes wireless communication technique, carries out network data transmission using air as medium, reaches the object that connects the different network segments.Due to the needs of commercial operation, your building of many apart from each others without between requirement can intercom mutually, the WLAN bridge that this just uses.
The bridge mode of WLAN bridge is divided into two kinds.One is point-to-point bridge mode, can be used to connect two networks that lay respectively at different location; Also having one is point-to-multipoint bridge mode, and it can be connected the telecommunication network of multiple off-lines, and the relatively point-to-point unlimited bridge of structure is more complicated.
WLAN bridge antenna mainly contains following three kinds of forms.
(1) omnidirectional antenna: omnidirectional antenna is evenly distributed on the central point 360 comprehensive regions of degree around by signal, is applicable to tie point close together and number many, the situation that distribution angle scope is large.
(2) antenna sector: antenna sector has energy directional aggregation capability, can effectively carry out that level 180 is spent, 120 degree, 90 degree, the covering within the scope of 60 degree, if can adopt antenna sector when therefore long-range tie point is relatively concentrated in a certain angular range.
(3) directional antenna: the energy accumulating ability of directional antenna is the strongest, the direction directive property of signal is fabulous.Therefore when long-distance chain number of connections less, or angle orientation quite concentrate time, adopt directional antenna be the most effective scheme.
Mostly conventional bridge antenna is plate aerial at present.As micro-strip array antenna or paster antenna.Its shortcoming is that loss is large, gains not high.
Summary of the invention
Technical problem to be solved by this invention is, for the above-mentioned deficiency of prior art, proposes the WLAN bridge antenna that a kind of loss is little, gain high.
The technical scheme that the present invention solves its technical problem employing is, a kind of WLAN bridge antenna is proposed, comprise the shell of a side opening and be arranged on the feed of shell opposite side, also comprise the super material that seals described shell aperture, described feed and super material coaxial setting, described super material is equated by multi-disc thickness, the super sheet of material that refraction index profile is identical forms, described super sheet of material comprises that base material and cycle are arranged in the multiple artificial micro-structural on base material, described super material is just provided with conical reflecting surface to the position of feed, the refraction index profile of described super sheet of material obtains as follows:
S1: in the situation that WLAN bridge antenna does not arrange super material, fill super material area and mark out the border of each super sheet of material with air, testing and record the electromagnetic wave of described feed radiation at the initial phase of the super sheet of material front surface of i layer
wherein, the initial phase of the super sheet of material front surface of i layer central spot is
S2: according to formula
obtain the phase place Ψ of super material rear surface central spot,
Wherein, the thickness that d is every layer of super sheet of material, λ is the electromagnetic wavelength of feed radiation, n
maxfor the largest refractive index value that described super material has, M is the total number of plies that forms the super sheet of material of described super material;
S3: according to formula
obtain the refractive index n (y) of super material each point,
Wherein, y is the distance of the super material center axis of any point distance on super material.
Further, described super sheet of material also comprises packed layer, and all artificial micro-structural in same super sheet of material is clamped between base material and packed layer.
Further, described packed layer is made by identical material with base material, and the gross thickness of described super sheet of material is 0.818mm, and wherein the thickness of packed layer and base material is 0.4mm, and the thickness of artificial micro-structural is 0.018mm.
Further, all artificial micro-structural in same super sheet of material has identical geometry, and on base material rounded arranging, the artificial micro-structural physical dimension maximum of circle centre position, the artificial micro-structural physical dimension at same radius place is identical.
Further, described artificial micro-structural is the alabastrine metal micro structure of plane, described metal micro structure has the first metal wire and the second metal wire mutually vertically divided equally, 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, and described the second metal wire two ends are connected on the mid point of two the second metal branches.
Further, the reflecting part of described shell and conical reflecting surface is made by PEC material.
Further, the cylindrical tabular of described super material, its diameter is 340mm, the distance of described feed and super material is 40mm.
Further, the centre position of described super material has a through hole, and described conical reflecting surface comprises the reflecting part of taper and be connected to the connecting portion of reflecting part bottom, and described connecting portion embeds in through hole, and described reflecting part and connecting portion are hollow structure.
Further, the variations in refractive index scope of described super sheet of material is 2-10.21.
Further, described feed is rectangular waveguide or circular waveguide, and its opening is rectified the reflecting part to conical reflecting surface.
According to WLAN bridge antenna of the present invention, refraction index profile in super sheet of material obtains by initial phase method, its computational process is easy to realize sequencing, encode, forming after code, user only needs to grasp the use of code, is convenient to large-scale promotion, and its thickness attenuation of WLAN bridge antenna, quality after the super material of interpolation lighten and directivity obtains larger enhancing, loss is little, gains high.
Accompanying drawing explanation
Fig. 1 is the structural representation of WLAN bridge antenna of the present invention;
Fig. 2 is the perspective diagram of the super material cell of a kind of form of the present invention;
Fig. 3 is the structural representation of the super sheet of material of a kind of form of the present invention;
Fig. 4 is the front view of the super material of a kind of form of the present invention;
Fig. 5 is that schematic diagram is calculated in the super Refractive Index of Material distribution of the present invention;
Fig. 6 is the derived structure of the alabastrine metal micro structure of plane.
Embodiment
As shown in Figure 1 to Figure 3, according to WLAN bridge antenna of the present invention, comprise the shell 2 of a side opening, be arranged on the feed 1 of shell 2 opposite sides and seal the super material 10 of described shell 2 openings, described feed 1 coaxially arranges with super material 10, described super material 10 is equated by multi-disc thickness, the super sheet of material 11 that refraction index profile is identical forms, described super sheet of material 11 comprises that base material 13 and cycle are arranged in the multiple artificial micro-structural 12 on base material 13, described super material 10 is just provided with conical reflecting surface 3 to the position of feed 1, the refraction index profile of described super sheet of material 11 obtains by initial phase method, initial phase method is specific as follows:
S1: as shown in Figure 5, in the situation that WLAN bridge antenna does not arrange super material, with air, fill super material area C and mark out the boundary B J of each super sheet of material, testing and record the electromagnetic wave of described feed 1 radiation at the initial phase of the super sheet of material front surface of i layer
initial phase
also can obtain by emulation, wherein, the initial phase of the super sheet of material front surface of i layer central spot is
for example we get the super sheet of material 111 of ground floor, and the initial phase of the super sheet of material front surface S of ground floor F1 is
the initial phase of the 1st layer of super sheet of material front surface central spot is
S2: according to formula
obtain the phase place Ψ of super material rear surface Sb central spot,
Wherein, the thickness that d is every layer of super sheet of material, λ is the electromagnetic wavelength of feed radiation, n
maxfor the largest refractive index value that described super material has, M is the total number of plies that forms the super sheet of material of described super material;
S3: according to formula
obtain the refractive index n (y) of super material each point, because we require the electromagnetic wave of outgoing is plane wave, be that exit facet is equiphase surface, super material rear surface each point phase place is identical, in addition, due to the refractive index maximum of center, therefore S2 can be easy to obtain the phase place Ψ of super material rear surface central point, make again the phase place of other point equal the phase place of central point, pass through
can be back-calculated to obtain n (y), obtain the refraction index profile of super material.
In above-mentioned, y is the distance of the super material center axis of any point distance on super material.
In addition, in above-mentioned method, also can do following optimization:, in S1, choose the initial phase of the super sheet of material of every layer,
in S2, calculate multiple Ψ, Ψ
1, Ψ
2, Ψ
3..., in S3, obtain multiple n (y), these multiple n (y) are tested, select an optimum n (y).
In the present invention, the multiple super sheet of material 11 of described super material 10 fits tightly, each other can be bonding by double faced adhesive tape, or be fixedly connected with by bolt etc.In addition, described super sheet of material 11 also comprises packed layer 15, and all artificial micro-structural 12 in same super sheet of material 11 is clamped between base material 13 and packed layer 15, and packed layer 15 can air, also can be other dielectric-slab, be preferably the plate-like piece that the material identical with base material 13 made.As shown in Figures 2 and 3, each super sheet of material 11 can be divided into multiple identical super material cell D, each super material cell D consists of an artificial micro-structural 12, unit base material V and unit packed layer W, and each super sheet of material 11 only has a super material cell D on thickness direction.Each super material cell D can be identical square, it can be cube, also cuboid, the length physical dimension of each super material cell D is not more than 1/5th (are generally incident electromagnetic wave wavelength 1/10th) of incident electromagnetic wave wavelength, to make whole super material have continuous electric field and/or magnetic responsiveness to electromagnetic wave.Under preferable case, described super material cell D is that the length of side is the cube of incident electromagnetic wave wavelength 1/10th.Certainly, the thickness of packed layer can regulate, its minimum value can be down to 0, that is to say and do not need packed layer, in such cases, unit base material V and the super material cell of artificial micro-structural 12 composition, the thickness that now thickness of super material cell D equals unit base material V adds the thickness of artificial micro-structural, but now, the thickness of super material cell D also will meet the requirement of 1/10th wavelength, therefore, in fact, at the thickness of super material cell D, be selected in 1/10th wavelength, the thickness of unit base material V is larger, the thickness of unit packed layer W is less, certainly in optimum situation, be situation as shown in Figure 2, be the thickness that the thickness of unit base material V equals unit packed layer W, and the material of first unit base material V is identical with packed layer W's.
As a kind of embodiment, the gross thickness of described super sheet of material 11 is 0.818mm, and wherein the thickness of packed layer and base material is 0.4mm, and the thickness of artificial micro-structural is 0.018mm.
As an embodiment, as shown in Fig. 1 and Fig. 4, the cylindrical tabular of described super material 10, its diameter is 340mm, the distance of described feed and super material is 40mm.The centre position of described super material 10 has a through hole 4, described conical reflecting surface 3 comprises the reflecting part 31 of taper and is connected to the connecting portion 32 of conical reflecting surface bottom, described connecting portion 32 embeds in through hole 4, and described reflecting part 31 is hollow structure with connecting portion 32, wherein fills air.From the formula (2) of above-mentioned initial phase method, we know, at d, determine, in the situation that the maximum of refractive index is also determined, just can obtain the expression formula of n (y), after obtaining the expression formula of n (y), if we limit the maximum (being exactly the diameter of super material in fact) of y, just can obtain the refractive index of whole super sheet of material, in addition in the situation that having through hole 4 to exist, the minimum value of y is restricted, and the minimum value of y equals the radius of reflecting part bottom.In the present embodiment, the variations in refractive index scope value of described super sheet of material is 2-10.21, can instead release the minimum value of y from this excursion, can obtain the radius of through hole 4.Certainly, also can not need through hole, now, y is since 0 to maximum, and conical reflecting surface is directly installed on super material surface.
In addition, described feed 1 is rectangular waveguide or circular waveguide, and its opening is rectified the reflecting part 31 to conical reflecting surface.Directly adopt waveguide to do feed, cost is low.
In the present invention, shell 2 preferably adopts PEC material to make, and the reflecting part 31 of same conical reflecting surface also adopts PEC material to make.Like this, as shown in Figure 1, the electromagnetic wave part that feed 1 sends is directly by super material 10 outgoing, and another part is beaten on the conical surface of reflecting part 31, then reflexes on shell, by shell, reflects again, finally by super material, penetrates.The benefit of doing is like this as follows:
(1) if feed is not just established conical reflecting surface to electromagnetic position, and the employing structure the same with super material, by some place, reflection of electromagnetic wave feedback source, cause energy loss, disturb the work of feed simultaneously, conical reflecting surface is set and has just changed reflection of electromagnetic wave direction, make the electromagnetic wave of reflection no longer enter feed, feed work is unaffected.
(2) shell adopts PEC material, rather than common plastics, like this, and the energy that conical reflecting surface can be reflected, then reflex on super material, by the backward distant place of super material, propagate, reduced energy loss.Certainly, under some specific (special) requirements, shell also can adopt absorbing material, and no longer reflection, absorbs reflected energy.
In addition, from formula (2), we can know, y is the distance of the super material center axis of any point distance on super material, same y value has multiple points, these points are coupled together, form a circle, thus, can know, the rounded distribution of refractive index of each super sheet of material, the super material cell of same radius (same y value) has identical refractive index, therefore, we can make, all artificial micro-structural 12 in same super sheet of material 11 has identical geometry, and rounded arranging on base material 13, near the artificial micro-structural 12 physical dimension maximums of circle centre position, the artificial micro-structural physical dimension at same radius place is identical, design like this, can obtain circular refraction index profile.
Artificial micro-structural 12 of the present invention is preferably metal micro structure, and described metal micro structure is comprised of one or more metal wire.Metal wire itself has certain width and thickness.Metal micro structure of the present invention is preferably the metal micro structure with isotropic electromagnetic parameter, the alabastrine metal micro structure of plane as described in Figure 3.
For the artificial micro-structural with planar structure, isotropism, referring to that, for the arbitrary electromagnetic wave with unspecified angle incident on this two dimensional surface, electric field response and the magnetic responsiveness of above-mentioned artificial micro-structural in this plane is all identical, is also that dielectric constant is identical with magnetic permeability; For the artificial micro-structural with three-dimensional structure, isotropism refers to the electromagnetic wave for incident in three-dimensional either direction, and electric field response and the magnetic responsiveness of each above-mentioned artificial micro-structural on three dimensions is all identical.When artificial micro-structural is 90 degree rotational symmetry structure, artificial micro-structural has isotropic feature.
For two-dimension plane structure, 90 degree Rotational Symmetries refer to that it overlaps with original structure after any 90-degree rotation of rotating shaft perpendicular to this plane and its symmetrical centre of mistake around one in this plane; For three-dimensional structure, if there are 3 rotating shafts of vertical and common intersection point (intersection point is pivot) between two, this structure is all overlapped with original structure after arbitrary rotating shaft 90-degree rotation or with original structure with an interface symmetry, this structure is 90 degree rotational symmetry structures.
The alabastrine metal micro structure of plane shown in Fig. 2 is a kind of form of isotropic artificial micro-structural, described alabastrine metal micro structure has the first metal wire 121 and the second metal wire 122 mutually vertically divided equally, described the first metal wire 121 two ends are connected with two the first metal branches 1211 of equal length, described the first metal wire 121 two ends are connected on the mid point of two the first metal branches 1211, described the second metal wire 122 two ends are connected with two the second metal branches 1221 of equal length, described the second metal wire 122 two ends are connected on the mid point of two the second metal branches 1221.And described the first metal branch and the second metal branch is equal in length.
Fig. 6 is a kind of derived structure of the alabastrine metal micro structure of plane shown in Fig. 2.Its two ends in each the first metal branch 1211 and the second metal branch 1221 are all connected with the 3rd metal branch 123, four the 3rd metal branches 123 are identical, and the mid point of corresponding the 3rd metal branch 123 is connected with the end points of the first metal branch and the second metal branch respectively.Like this, the metal micro structure shown in Fig. 5 is also a kind of isotropic metal micro structure of planar structure of form.The rest may be inferred, can also derive the metal micro structure of other form.
In the present invention, the base material of described super sheet of material is 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.
In the present invention, described metal micro structure is the metal wires such as copper cash or silver-colored line.Above-mentioned metal wire can be attached on base material by etching, plating, brill quarter, photoetching, electronics is carved or ion is carved method.Certainly, also can adopt three-dimensional laser processing technology.
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; rather than 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 (9)
1. a WLAN bridge antenna, comprise the shell of a side opening and be arranged on the feed of shell opposite side, it is characterized in that: also comprise the super material that seals described shell aperture, described feed and super material coaxial setting, described super material is equated by multi-disc thickness, the super sheet of material that refraction index profile is identical forms, described super sheet of material comprises that base material and cycle are arranged in the multiple artificial micro-structural on base material, described super material is just provided with conical reflecting surface to the position of feed, the centre position of described super material has a through hole, described conical reflecting surface comprises the reflecting part of taper and is connected to the connecting portion of reflecting part bottom, described connecting portion embeds in through hole, described reflecting part and connecting portion are hollow structure, the refraction index profile of described super sheet of material obtains as follows:
S1: in the situation that WLAN bridge antenna does not arrange super material, fill super material area and mark out the border of each super sheet of material with air, testing and record the electromagnetic wave of described feed radiation at the initial phase of the super sheet of material front surface of i layer
wherein, the initial phase of the super sheet of material front surface of i layer central spot is
S2: according to formula
obtain the phase place Ψ of super material rear surface central spot,
Wherein, the thickness that d is every layer of super sheet of material, λ is the electromagnetic wavelength of feed radiation, n
maxfor the largest refractive index value that described super material has, M is the total number of plies that forms the super sheet of material of described super material;
S3: according to formula
obtain the refractive index n (y) of super material each point,
Wherein, y is the distance of the super material center axis of any point distance on super material.
2. WLAN bridge antenna as claimed in claim 1, is characterized in that: described super sheet of material also comprises packed layer, and all artificial micro-structural in same super sheet of material is clamped between base material and packed layer.
3. WLAN bridge antenna as claimed in claim 2, it is characterized in that: described packed layer is made by identical material with base material, the gross thickness of described super sheet of material is 0.818mm, and wherein the thickness of packed layer and base material is 0.4mm, and the thickness of artificial micro-structural is 0.018mm.
4. WLAN bridge antenna as claimed in claim 2 or claim 3, it is characterized in that: all artificial micro-structural in same super sheet of material has identical geometry, and rounded arranging on base material, the artificial micro-structural physical dimension maximum of circle centre position, the artificial micro-structural physical dimension at same radius place is identical.
5. WLAN bridge antenna as claimed in claim 4, it is characterized in that: described artificial micro-structural is the alabastrine metal micro structure of plane, described metal micro structure has the first metal wire and the second metal wire mutually vertically divided equally, 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.
6. WLAN bridge antenna as claimed in claim 1, is characterized in that: the reflecting part of described shell and conical reflecting surface is made by PEC material.
7. WLAN bridge antenna as claimed in claim 1, is characterized in that: the cylindrical tabular of described super material, and its diameter is 340mm, the distance of described feed and super material is 40mm.
8. WLAN bridge antenna as claimed in claim 1, is characterized in that: the variations in refractive index scope of described super sheet of material is 2-10.21.
9. WLAN bridge antenna as claimed in claim 1, is characterized in that: described feed is rectangular waveguide or circular waveguide, and its opening is rectified the reflecting part to conical reflecting surface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110331114.0A CN102544704B (en) | 2011-10-27 | 2011-10-27 | Wireless local area network (WLAN) network bridge antenna |
| PCT/CN2012/073798 WO2013060122A1 (en) | 2011-10-27 | 2012-04-11 | Wlan bridge antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110331114.0A CN102544704B (en) | 2011-10-27 | 2011-10-27 | Wireless local area network (WLAN) network bridge antenna |
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| CN102544704B true CN102544704B (en) | 2014-04-16 |
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| CN102544742A (en) * | 2011-10-28 | 2012-07-04 | 深圳光启高等理工研究院 | Method for designing metamaterial refractive-index distribution and metamaterial with refractive-index distribution |
| CN103594791B (en) * | 2013-11-08 | 2016-08-17 | 深圳光启创新技术有限公司 | Metamaterial board, reflector antenna system and reflection of electromagnetic wave control method |
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| CN101542838B (en) * | 2006-08-25 | 2013-03-13 | 泰科电子服务有限责任公司 | Antennas based on metamaterial structures |
| US7570432B1 (en) * | 2008-02-07 | 2009-08-04 | Toyota Motor Engineering & Manufacturing North America, Inc. | Metamaterial gradient index lens |
| US8493281B2 (en) * | 2008-03-12 | 2013-07-23 | The Boeing Company | Lens for scanning angle enhancement of phased array antennas |
| US9190735B2 (en) * | 2008-04-04 | 2015-11-17 | Tyco Electronics Services Gmbh | Single-feed multi-cell metamaterial antenna devices |
| CN101303788B (en) * | 2008-06-05 | 2010-08-25 | 北京航空航天大学 | Perimeter alarming method and system for implementing orientation of composite type complete optical fiber |
| US7855691B2 (en) * | 2008-08-07 | 2010-12-21 | Toyota Motor Engineering & Manufacturing North America, Inc. | Automotive radar using a metamaterial lens |
| CN101699659B (en) * | 2009-11-04 | 2013-01-02 | 东南大学 | Lens antenna |
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