CN108987938A - Manufacturing method and device of conformal passive indicator of Longbo electromagnetic lens reflector based on ABS material - Google Patents
Manufacturing method and device of conformal passive indicator of Longbo electromagnetic lens reflector based on ABS material Download PDFInfo
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- CN108987938A CN108987938A CN201810801837.4A CN201810801837A CN108987938A CN 108987938 A CN108987938 A CN 108987938A CN 201810801837 A CN201810801837 A CN 201810801837A CN 108987938 A CN108987938 A CN 108987938A
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/16—Reflecting surfaces; Equivalent structures curved in two dimensions, e.g. paraboloidal
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Abstract
The invention provides a manufacturing method and device of a conformal passive indicator of a Longbo electromagnetic lens reflector based on an ABS material. The conformal passive indicator of the Longbo electromagnetic lens reflector based on the ABS material is obtained by adopting the principle of the enhanced reflection characteristic of an electromagnetic lens to an electromagnetic signal and adopting the special configuration of ABS materials with different dielectric constants for 3D printing. The method provided by the invention has the characteristics of simplicity, convenience, flexibility, simplicity and reliability; the device is simple in manufacturing process, high in precision, low in cost, available in materials, light in weight and good in wide angle response, and can be applied to target position searching, detection, positioning, tracking and the like as the conformal passive indicator. Meanwhile, the device obtained by the invention adopts a spherical Longbo lens structure and different array modes, and the requirements of different performances are met by changing the number and radius of spherical shells, the dielectric constant of the manufacturing material, the size and position of a metal reflecting surface and the array mode.
Description
Technical field
The present invention relates to antenna technical fields, and in particular to a kind of vigorous electromagnetic lens reflector of dragon based on ABS material
The production method and device of conformal passive indicators.
Background technique
Currently, the technologies such as airmanship, radar detection are fast-developing, various applications propose the acquisition of electromagnetic wave signal
Increasingly strict requirements, target following then need antenna to have a higher gain, the investigation of larger range sky day, searching requirement have compared with
High sensitivity and reaction speed, the fields such as unmanned anticollision, tracking, guidance then need low cost and efficient Target indication
Enhancements.Optical detection and electromagnetic wave detection is fastest in wireless exploration field, and optical detection is by visual field barrier and weather
Be affected, and electromagnetic wave detection influenced by above-mentioned factor it is smaller or even unaffected.Active radio detection effect away from
The power of target echo is depended primarily on from, recognition accuracy and positioning accuracy, and reflects signal strength or weakness and metal target
Specular cross section it is directly proportional, the certain signal reflex efficiency of area is also certain, is unfavorable for remote, accurately detecting, Er Feijin
Belong to target to act on electromagnetic wave signal areflexia, so have no way of detecting.In addition, the vigorous lens of optics dragon are since production is complicated, structure
Volume is big, expensive, is only limitted to guide limited occasion applied to the warship flight of such as aircraft carrier, and electromagnetic wave dragon is vigorous saturating
Mirror is also applied only for the electromagnetic wave dual-mode antenna of special installation by the same token.Therefore, there is an urgent need to one kind not to depend on
In the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon different from the vigorous manufacture material of conventional dragon, technique, structure, low cost
Production method and device.
The content of present invention
The vigorous electromagnetic lens reflector of the dragon that in order to solve the above-mentioned technical problems, the present invention provides a kind of based on ABS material
Conformal passive indicators production method and device.
The present invention adopts the following technical scheme:
On the one hand, the conformal passive instruction of the vigorous electromagnetic lens reflector of the dragon that the present invention provides a kind of based on ABS material
The production method of device, comprising the following steps:
S01: the structure size, shape and conformal array material of conformal array are designed；
S02: structure size, electric parameter and the array element material of array element are designed；
S03: according to the step S01-S02, the 3D of the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon is constructed
Model, and it is directed to the 3D model, more material 3D printings are carried out, the conformal passive instruction of the vigorous electromagnetic lens reflector of dragon is obtained
Device.
Preferably, in the present invention, the structure of the conformal array is specially one of planar array, cylindrical array, sphere battle array；
The conformal array material is consistent with the outermost layer ball material of the array element.
Preferably, in the present invention, the step S02 the following steps are included:
S021: the design parameter of the vigorous electromagnetic lens of sphere dragon is designed, wherein the parameter includes that the sphere dragon is vigorous
The radius of a ball r of the homocentric sphere number of plies N of electromagnetic lens, each layer homocentric spherej, each layer homocentric sphere permittivity εj, j=1,
2,…,N；
S022: according to the design parameter, the ABS material of each layer homocentric sphere is determined；
S023: according to the width requirement of directional diagram, parameter, the material of reflecting mirror are set.
Preferably, in the present invention, in the step S021, specifically includes the following steps:
S0211: the vigorous electromagnetic lens reflector homocentric sphere number of plies N of the dragon is determined；
S0212: innermost layer radius of a ball r is determined1With outermost layer radius of a ball rNMaximum radius than, with innermost layer ball material
Permittivity ε1；
S0213: the concentric radius of a ball r of each layer is determined1、r2、…、rN；
S0214: the permittivity ε of each layer homocentric sphere is determined2、ε3、…、εN。
Preferably, in the present invention, in the step S0213, meet between the radius of a ball of each layer homocentric sphere:
ri+1-riλ/2 <,
Wherein, i=1,2 ..., N-1, λ indicate the electromagnetic wavelength that the vigorous electromagnetic lens reflector of the dragon uses.
Preferably, in the present invention, in the step S0214, the permittivity ε of each layer homocentric sphere1、ε2、
ε3、…、εNMeet:
ε1> ε2> ε3> ... > εN> ε0
Wherein, ε0Indicate the dielectric constant of air；And the permittivity ε1、ε2、ε3、…、εNIn regular stepped change.
Preferably, in the present invention, in the step S022, using same mesh number different ratio, with proportion different meshes,
Different meshes different ratio either type determines the ABS material of each layer homocentric sphere.
Preferably, in the present invention, in the step S023, the reflecting mirror outermost layer ball sphere centre, and
Meet following formula:
Wherein, S indicates the area of the reflecting mirror；SwIndicate the area of the outermost layer spherical surface.
Preferably, in the present invention, the reflecting mirror is located at the opposite spherical surface in Electromagnetic Wave Propagation direction, and the reflecting mirror
Spherical shape.
On the other hand, the vigorous electromagnetic lens reflector of the dragon that the present invention also provides a kind of based on ABS material it is conformal passive
Indicator, according to claim 1 the production method system of -9 any vigorous electromagnetic lens reflectors of spheres dragon based on ABS material
The conformal passive indicators of the vigorous electromagnetic lens reflector of the dragon of work.
Advantageous effects of the present invention
The present invention, to the enhancing reflection characteristic principle of electromagnetic signal, is situated between by using electromagnetic lens using particular arrangement difference
Electric constant ABS material carries out 3D printing method, obtains having based on the conformal passive indicators of imperial vigorous electromagnetic wave lens reflector
Following characteristics:
1. method provided by the present invention has the characteristics that easy, flexible, simple, reliable.
2. device manufacture craft provided by the present invention is simple, precision is high, at low cost, material preferably obtains, is light-weight, it is good to have
Good wide angular response can be applied to target position search, detection, positioning, tracking etc. as conformal passive indicators.
3. the obtained device of the present invention is using the vigorous lens arrangement of sphere dragon and different array manners, by changing spherical shell
Number, radius, the dielectric constant of making material, the size of metal mirror and position and array manner are to meet different performance
Demand.
Detailed description of the invention
Fig. 1 is the working principle diagram of the vigorous electromagnetic lens reflector of sphere dragon；
Fig. 2 is the vigorous electromagnetic lens reflector structure schematic diagram of one embodiment of the invention sphere dragon；
Fig. 3 is one embodiment of the invention conformal array structural schematic diagram；
Fig. 4 is a cylindrical array example structure schematic diagram of the invention；
Fig. 5 is a planar array example structure schematic diagram of the invention.
Specific embodiment
Preferred embodiments of the invention will be described in detail below；Preferred embodiments be should be appreciated that only for saying
The bright present invention, rather than limiting the scope of protection of the present invention.
It referring to Fig.1, is the operation principle schematic diagram of the vigorous electromagnetic lens reflector of dragon, the vigorous electromagnetic lens reflector of the dragon is one
Kind has the medium sphere of gradient dielectric constant structure, is made of the dielectric homocentric sphere of several layers of differing dielectric constant, outer surface
Part is coated with metallic reflector, and the dielectric constant of outer layer is close with air, more bigger by the layer dielectric constant of the centre of sphere, can incite somebody to action
Incident electromagnetic beam focusing is reflected back along primary ray track.When the spherical surface that the metallic reflector area of coating is outermost layer ball
When area 1/4, the width of directional diagram is about 90 °, with the increase of the metal reflective layer area of coating, can make the width of directional diagram
Also increase.
On the one hand, the conformal passive instruction of the vigorous electromagnetic lens reflector of the dragon that the present invention provides a kind of based on ABS material
The production method of device, comprising the following steps:
S01: the structure size, shape and conformal array material of conformal array are designed；
Specifically, the conformal array can be planar shaped, cylinder, spherical and other common array manners, Huo Zheyi
According to actual conditions, different array manners is set.Wherein, every kind of array structure form can have different array element arranged distribution sides
Case, planar array can realize that vertical signal reflection, cylindrical array can realize that along the circumferential direction fan-shaped signal reflex, spherical can be realized and be put
Penetrate shape signal reflex etc..
Meanwhile in order to simplify manufacture craft, reduce cost, the bond strength of conformal array structure is combined, conformal array
Support structure material selection and the consistent material of array element outermost layer ball material.
S02: structure size, electric parameter and the array element material of array element are designed；
Preferably, in the present invention, the step S02 the following steps are included:
S021: the design parameter of the vigorous electromagnetic lens of sphere dragon is designed, wherein the parameter includes that the sphere dragon is vigorous
The radius of a ball r of the homocentric sphere number of plies N of electromagnetic lens, each layer homocentric spherej, each layer homocentric sphere permittivity εj, j=1,
2,…,N；
Preferably, in the present invention, in the step S021, specifically includes the following steps:
S0211: the vigorous electromagnetic lens reflector homocentric sphere number of plies N of the dragon is determined；
Theoretically, the more efficiency of the lens number of plies are higher, but manufacture craft is more complicated, cost is also higher, and simulation study shows
The number of plies is more than after 12 layers, and lens efficiency slows down with the increase increasing degree of the number of plies, and the actual design number of plies takes 12 or less.In conjunction with this system
Make method and technique, measuring and calculating shows 12 layers or less when taking even level 4,6,8 ... layer, the efficiency of lens, technique, cost resultant effect
Preferably.
S0212: innermost layer radius of a ball r is determined1With outermost layer radius of a ball rNMaximum radius than, with innermost layer ball material
Permittivity ε1；
S0213: the concentric radius of a ball r of each layer is determined1、r2、…、rN；
S0214: the permittivity ε of each layer homocentric sphere is determined2、ε3、…、εN。
Preferably, in the present invention, in the step S0213, meet between the radius of a ball of each layer homocentric sphere:
ri+1-riλ/2 <,
Wherein, i=1,2 ..., N-1, λ indicate the electromagnetic wavelength that the vigorous electromagnetic lens reflector of the dragon uses.
Preferably, in the present invention, in the step S0214, the permittivity ε of each layer homocentric sphere1、ε2、
ε3、…、εNMeet:
ε1> ε2> ε3> ... > εN> ε0
Wherein, ε0Indicate the dielectric constant of air；And the permittivity ε1、ε2、ε3、…、εNIn regular stepped change.
S022: according to the design parameter, the ABS material of each layer homocentric sphere is determined；
Preferably, in the present invention, in the step S022, using same mesh number different ratio, with proportion different meshes,
Different meshes different ratio either type determines the ABS material of each layer homocentric sphere.
Further, three kinds of basic preparation methods of each layer printed material:
1. with mesh number different ratio.A, the granularity of tri- kinds of materials of B, S is identical, is all larger than 100 mesh, but component ratio is not
Together, adjustment ratio is to obtain the ABS mixtures of different electric medium constants；
2. with proportion different meshes.A, the component ratio of tri- kinds of materials of B, S is identical, but granularity mesh number is different and is all larger than
100 mesh adjust mesh number to obtain the ABS mixture of different electric medium constants；
3. different meshes different ratio.A, the granularity of tri- kinds of materials of B, S is adjustable and is not less than 100 mesh, and component ratio can
It adjusts, with the ABS mixture of various granularities collocation electric medium constant different with component ratio adjustment acquisition.
Here, it should be noted that ABS material is the ternary of acrylonitrile (A), butadiene (B), styrene (S) three kinds of monomers
Copolymer, have isotropism, homogeneous media, dielectric constant hardly follow frequency variation, water imbibition it is small, it is airtight, non-degradable,
Anticorrosion, anti-aging, good heat preservation performance, service life be more than 30 years, light weight, cheap；It is the good of production electromagnetic lens
Good material, it is important that ABS material is the ideal material of three D printing technology.
But since the dielectric constant of imperial vigorous electromagnetic lens is required in 1~2 range, and the dielectric of common ABS material is normal
Number lower limit is higher, seriously affects lens efficiency.The invention proposes a kind of lowest dielectric constant up to 1.05 photosensitive ABS material
Material, foozle control within ± 0.01, meet manufacturing process requirement.With heterogeneity ratio, different granularities with
And photosensitive resin additive (photosensitive resin material DSM Somos 14120 or DSM Somos GP Plus 14122), it is configured to
The various photosensitive ABS mixtures of dielectric constant 1.05~2.0 are used for photocuring 3D printing technique.
Simultaneously as 3D printing Light Curing can make the dielectric constant of molded material change, therefore configuring
It copes with dielectric constant when printed material to be modified, if the dielectric constant of each layer ball material is ε after printing machine-shapingn(n=
1,2,3 ...), then the dielectric constant of practical each layer printing ingredient should be εn+Δεn(n=1,2,3 ...), wherein Δ εn(n=1,
2,3 ...) it is the correction factor of layers of material, is set with layer structural parameters (thickness), material, photosensitive resin additive and printer
Set relating to parameters.
S023: according to the width requirement of directional diagram, parameter, the material of reflecting mirror are set.
Preferably, in the present invention, in the step S023, the reflecting mirror outermost layer ball sphere centre, and
Meet following formula:
Wherein, S indicates the area of the reflecting mirror；SwIndicate the area of the outermost layer spherical surface.
Preferably, in the present invention, the reflecting mirror is located at the opposite spherical surface in Electromagnetic Wave Propagation direction, and the reflecting mirror
Spherical shape.
S03: according to the step S01-S02, the 3D of the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon is constructed
Model, and it is directed to the 3D model, more material 3D printings are carried out, the conformal passive instruction of the vigorous electromagnetic lens reflector of dragon is obtained
Device.
On the other hand, the vigorous electromagnetic lens reflector of the dragon that the present invention also provides a kind of based on ABS material it is conformal passive
Indicator, according to claim 1 the production method system of -9 any vigorous electromagnetic lens reflectors of spheres dragon based on ABS material
The conformal passive indicators of the vigorous electromagnetic lens reflector of the dragon of work.
It is carried out below with specific embodiment to proposed by the invention a kind of based on the conformal of imperial vigorous electromagnetic lens reflector
The production method of passive indicators is illustrated, as shown in Figure 2.
Specifically, present embodiment is to carry out conformal passive indicators production based on 6 layers of vigorous electromagnetic lens reflector of structure dragon
It is illustrated for method.
S01: the structure size, shape and conformal array material of conformal array are designed；
Conformal array uses cylindrical array, as shown in Fig. 3 (b).Using the vigorous electromagnetic lens hair of 6 layers of sphere dragon shown in Fig. 2
Emitter structure；The radial section of non-cylindrical conformal battle array passive electromagnetic reflectance target indicator is as shown in Figure 4.The conformal support of embodiment
Cylindrical body outer diameter ROutside=30mm, internal diameter RIt is interior=25mm, array element diameter of phi=10mm, array element circle distribution are 16.
Wherein, the outer dimension of non-cylindrical conformal battle array can be with flexible choice, to be no more than the printing limit of 3D printing equipment
Size is limited.
S02: structure size, electric parameter and the array element material of array element are designed；
Step S021: determine that the homocentric sphere number of plies is 6.
Step S022: inside and outside radius of a ball ratio rR (corresponding diagram 2 are as follows: r is determined1/r6), take 0.4=r1/r6, set ε1=
1.91。
Step S023: inner radius of sphere diameter r is determined1With r2、r3、r4、…rn.By optimizing calculating and simulating, verifying, each layer ball
Radius value is as shown in table 1.
1 each layer of ball outer radius values of table
It should be noted that r in the present embodiment1With r2、r3、r4、r5And r6It can equal proportion scaling.
Step S024: design optimization permittivity εn(n=1,2,3 ...).Corresponding 6 layers of structure, it is each after optimized calculating
Layer dielectric constant is as shown in table 2.
2 each layers of dielectric constant values of table
S022: according to the design parameter, the ABS material of each layer homocentric sphere is determined；
The present embodiment considers modification of dielectric constant value, matches according to the configuration criteria of three kinds of material different meshes different ratios
System meets the material of each layer sphere dielectric constant requirement, as shown in table 3.
The practical preparation dielectric constant values of each layer of table 3
Step S023: according to the width requirement of directional diagram, parameter, the material of reflecting mirror are set；
1. selecting the aluminium powder (AL) plus appropriate 14120 photosensitive resin of DSM Somos of 100 mesh；
2. calculating 1/4 that reflecting mirror area coverage is ectosphere surface area according to the width requirement of 90 degree of directional diagrams.
S03: according to the step S01-S02, the 3D of the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon is constructed
Model, and it is directed to the 3D model, more material 3D printings are carried out, the conformal passive instruction of the vigorous electromagnetic lens reflector of dragon is obtained
Device.
Referring to table 1 for each layer radius data and table 2 to the dielectric constant of each layer, using Objet260Connex
More material 3D printers print the dielectric constant homocentric sphere of 6 layers of stepped change；
According to 90 ° of width requirements of directional diagram, the metal mirror of printing covering 1/4 area of ectosphere is actually subjected to reaching
It asks.
Further, conformal array structure 3D model, production print code are constructed.By 3D graphic design tool software, design
Conformal array structure 3D model is constructed, generates and exports 3D model；3D model is adjusted using 3D printing software, the ratio for adjusting it is big
It is small etc., print parameters are set.Print conformal array passive electromagnetic reflectance target indicator.
In addition, the present invention also provides planar array is used when conformal array, as shown in Fig. 3 (a).Wherein, Fig. 5 is plane
When array, the effect diagram of the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon.
By setting the axis direction of each array element reflecting mirror, conformal array passive electromagnetic reflectance target indicator pair can be made
Electromagnetic wave, which has the effect of reflecting, to be focused, and focal length f and focusing angle α can be realized by the axis direction of change array element reflecting mirror can
It adjusts.Fig. 5 is shown by taking planar array as an example, provides the focusing effect schematic diagram obtained after adjustment array element installation direction, wherein f and α
It can be adjustable by changing the axial location realization of array element reflecting mirror.
In conjunction with the bond strength of conformal array structure, the support structure material selection and array element outermost layer ball of non-cylindrical conformal battle array
Body material is consistent.In practical application, the support structure material selection of conformal array can be required according to the technique of 3D printer, according to need
It selects.
The above is only used to illustrate the technical scheme of the present invention and not to limit it, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (10)
1. a kind of production method of the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon based on ABS material, feature exist
In: the following steps are included:
S01: the structure size, shape and conformal array material of conformal array are designed；
S02: structure size, electric parameter and the array element material of array element are designed；
S03: according to the step S01-S02, constructing the 3D model of the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon,
And it is directed to the 3D model, more material 3D printings are carried out, the conformal passive indicators of the vigorous electromagnetic lens reflector of dragon are obtained.
2. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 1
Production method, it is characterised in that:
The structure of the conformal array is specially one of planar array, cylindrical array, sphere battle array；
The conformal array material is consistent with the outermost layer ball material of the array element.
3. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 1
Production method, it is characterised in that: the step S02 the following steps are included:
S021: the design parameter of the vigorous electromagnetic lens of sphere dragon is designed, wherein the parameter includes the vigorous electromagnetism of the sphere dragon
The radius of a ball r of the homocentric sphere number of plies N of lens, each layer homocentric spherej, each layer homocentric sphere permittivity εj, j=1,2 ..., N；
S022: according to the design parameter, the ABS material of each layer homocentric sphere is determined；
S023: according to the width requirement of directional diagram, parameter, the material of reflecting mirror are set.
4. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 3
Production method, it is characterised in that: in the step S021, specifically includes the following steps:
S0211: the vigorous electromagnetic lens reflector homocentric sphere number of plies N of the dragon is determined；
S0212: innermost layer radius of a ball r is determined1With outermost layer radius of a ball rNMaximum radius than, with the dielectric of innermost layer ball material
Constant ε1；
S0213: the concentric radius of a ball r of each layer is determined1、r2、…、rN；
S0214: the permittivity ε of each layer homocentric sphere is determined2、ε3、…、εN。
5. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 3
Production method, it is characterised in that: in the step S0213, meet between the radius of a ball of each layer homocentric sphere:
ri+1-riλ/2 <,
Wherein, i=1,2 ..., N-1, λ indicate the electromagnetic wavelength that the vigorous electromagnetic lens reflector of the dragon uses.
6. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 3
Production method, it is characterised in that: in the step S0214, the permittivity ε of each layer homocentric sphere1、ε2、ε3、…、εNIt is full
Foot:
ε1> ε2> ε3> ... > εN> ε0
Wherein, ε0Indicate the dielectric constant of air；And the permittivity ε1、ε2、ε3、…、εNIn regular stepped change.
7. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 3
Production method, it is characterised in that: in the step S022, using same mesh number different ratio, with proportion different meshes, different mesh
Number different ratio either type determines the ABS material of each layer homocentric sphere.
8. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 1
Production method, it is characterised in that: in the step S023, the reflecting mirror outermost layer ball sphere centre, and meet under
Formula:
Wherein, S indicates the area of the reflecting mirror；SwIndicate the area of the outermost layer spherical surface.
9. the conformal passive indicators of the vigorous electromagnetic lens reflector of a kind of dragon based on ABS material according to claim 6
Production method, it is characterised in that: the reflecting mirror is located at the opposite spherical surface in Electromagnetic Wave Propagation direction, and the reflecting mirror is spherical
Shape.
10. a kind of conformal passive indicators of the vigorous electromagnetic lens reflector of dragon based on ABS material, it is characterised in that: according to power
The vigorous electromagnetism of dragon of the production method production for the vigorous electromagnetic lens reflector of sphere dragon that benefit requires 1-9 any based on ABS material
The conformal passive indicators of lens reflector.
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| CN109914918A (en) * | 2018-12-17 | 2019-06-21 | 吴奕芝 | A kind of carbon fiber quadric injection mould key shell and injection molding composite molding technique |
| CN112350074A (en) * | 2020-10-28 | 2021-02-09 | 厦门华厦学院 | Luneberg lens reflector and passive radar reflecting ball comprising same |
| CN114545406A (en) * | 2022-04-25 | 2022-05-27 | 广东福顺天际通信有限公司 | Programmable reflector |
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