CN109462011A - A kind of radar antenna and radar antenna array based on 3D printing technique - Google Patents
A kind of radar antenna and radar antenna array based on 3D printing technique Download PDFInfo
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- CN109462011A CN109462011A CN201811367844.4A CN201811367844A CN109462011A CN 109462011 A CN109462011 A CN 109462011A CN 201811367844 A CN201811367844 A CN 201811367844A CN 109462011 A CN109462011 A CN 109462011A
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- radar antenna
- waveguide
- radiating aperture
- feed
- coupling slot
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/02—Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/06—Waveguide mouths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
The invention discloses a kind of radar antenna and radar antenna array based on 3D printing technique, the radar antenna melts 3D printing technique using selective laser, it is integrally formed using metal powder, the radar antenna includes: square flange, feed waveguide and radiating aperture, the feed waveguide is perpendicular on the square flange, the radiating aperture is perpendicular on the feed waveguide, the radiating aperture includes square metal chamber, waveguide coupling slot and four rectangular pillars, rectangular pillar in four rectangular pillars on the waveguide coupling slot short-axis direction, constitute two pairs of electric dipoles, rectangular pillar in four rectangular pillars on the waveguide coupling slot long axis direction, constitute two pairs of magnetic dipoles.Radar antenna proposed by the present invention considers water cooling wind-cooling heat dissipating channel at the beginning of design, does not have to individually matching radiator, while ensure that the performance of radar antenna itself.
Description
Technical field
The present invention relates to radar antenna fields, more particularly to a kind of radar antenna and radar based on 3D printing technique
Aerial array.
Background technique
Antenna is widely used in the radio systems such as communication, broadcast, TV, radar and navigation, plays propagation
The effect of radio wave is effective eradiation and receives the essential device of radio wave.
To radiate and receive electromagnetic wave and determine that the equipment of its detection direction is exactly radar antenna, radar antenna in radar
With the function that electromagnetic wave is polymerized to wave beam, directionally emit and receive electromagnetic wave, there are many radar antenna type, by its structure shape
Formula, mainly there is a reflector antenna and array antenna two major classes, and array antenna is because of its high gain, the advantages that beam direction controls well,
More and more widely used, and the ability of the formation wave beam of array antenna also determines the ability of antenna.
Array antenna using electromagnetic dipole as the array element of Wave beam forming, be not only simple in structure, section it is low, and
And the impedance matching bandwidth of 43.8 (VSWR≤2) % is realized, there is stable radiation characteristic, the back lobe radiation of very little and intersection
Polarization, working at the same time has stable gain in frequency range, has well, the Wave beam forming ability of high quality, but this day
Line calorific value is high, it is necessary to individually be equipped with water cooling or air-cooled equipment and carry out cooling and heat dissipation to antenna, could antenna be held
Continuous operation.
Summary of the invention
In view of the above problems, the present invention provides a kind of radar antenna based on 3D printing technique, solves existing radar day
Line needs the problem of being individually equipped with cooling and heat dissipation equipment because calorific value is high.
The embodiment of the present invention provides a kind of radar antenna based on 3D printing technique, and the radar antenna is swashed using selectivity
Light melt 3D printing technique, be integrally formed using metal powder, the radar antenna include: square flange, feed waveguide and
Radiating aperture；
The feed waveguide perpendicular on the square flange, in the middle part of the feed waveguide more than, close to the radiating aperture
The bending of diameter end, the feed waveguide are hollow；
On the square flange, corresponds to the feed waveguide hollow space and be equipped with square groove, size and the feed wave
It is equal to lead hollow space, the square groove and the feed waveguide hollow space form waveguide and for feeding to radiating aperture
Electromagnetic wave signal and wind-cooling heat dissipating；
For the radiating aperture perpendicular on the feed waveguide, the radiating aperture includes square metal chamber, waveguide coupling
Slot and four rectangular pillars, four rectangular pillars are symmetrical along the waveguide coupling slot long axis direction two sides, described
Waveguide coupling slot is hollow below the square metal chamber bottom center, the waveguide coupling slot, in the feed waveguide
Empty part communicates, and forms waveguide, excitation magnetoelectricity dipole and is used for wind-cooling heat dissipating；
Two rectangular pillars ipsilateral along the waveguide coupling slot short-axis direction in four rectangular pillars constitute one
To electric dipole, two pairs of electric dipoles are constituted altogether, and two pairs of electric dipoles form seam between the square metal cavity wall respectively
Gap, for electromagnetic wave to be coupled to electric dipole, and promotion magnetic dipole radiation；
Two rectangular pillars ipsilateral along the waveguide coupling slot long axis direction in four rectangular pillars constitute one
To magnetic dipole, two pairs of magnetic dipoles are constituted altogether, and the waveguide coupling slot is used to feed electromagnetic wave signal to radiating aperture, promote
Electromagnetic wave is coupled to electric dipole.
Optionally, the square metal cavity volume is less than the radiating aperture volume, and the square metal chamber height is less than
The radiating aperture height, the upper surface of the square metal chamber are flushed with the radiating aperture upper surface, the rectangular pillar
Height is equal with the square metal chamber height.
Optionally, width hollow below the waveguide coupling slot is less than the width of the waveguide coupling slot, for promoting
Reception and transmitting of the radar antenna to electromagnetic wave.
The embodiment of the present invention also provides a kind of radar antenna array based on 3D printing technique, on the radar antenna array
Portion includes: the aerial array constituted using four feed waveguides and radiating aperture as described above；
It include supporter in the middle part of the radar antenna array, lower part includes pedestal, and the supporter is hollow, with the feed
Waveguide hollow space is equal in magnitude and is connected with each other；
On the pedestal, corresponds to the supporter hollow space and be equipped with square groove, size and the supporter hollow portion
Split-phase etc., the square groove and the supporter hollow space and the feed waveguide hollow space form waveguide and are used for
Wind-cooling heat dissipating.
Optionally, two in four feed waveguides and the radiating aperture are subjected to group using opposite connection
It closes, component parts one, the opposite connection, i.e., one of them described feed waveguide and the radiating aperture are relative to another
The feed waveguide and the radiating aperture overturn 180 degree, two radiating apertures are docked, then two feed waves
It leads to form up-narrow and down-wide channel.
Optionally, by four feed waveguides and the radiating aperture other two also using it is opposite connect into
Component one and component two are connected in parallel by row combination, component parts two, and component one and the channel of component two are completely coincident, described
Water-cooling is walked and carried out to upper part of channel arrow path for water cooled pipeline, and the wide road in lower part is used for wind-cooling heat dissipating.
Optionally, when the component one is connected in parallel with the component two, radiating aperture in the component one with it is described
The first gap is equipped between radiating aperture in component two, the supporter is set close to the part on the array radar antanna top
There is the second gap, second gap is equal with first gap size and interconnects, first gap and described the
Two gaps are used for wind-cooling heat dissipating.
Compared with existing radar antenna, a kind of radar antenna based on 3D printing technique provided by the invention passes through selection
Property laser melt 3D printing technique, by metal powder according to design be integrally formed, the radar antenna printed, natural shape pore-forming
Hole, water cooling tube can run through entire antenna by hole, radar antenna ontology be close to, while there are also air-cooled channels, so that radar
Antenna heat dissipation effect is greatly improved, and while ensure that radar antenna self performance, also saves water cooling, air-cooled sets
It is standby, so that radar antenna minimizes, it is more convenient to use.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the CAD diagram of radar antenna of the present invention；
Fig. 2 is the y-o-z cross-sectional view of radar antenna of the present invention and the top view of component；
Fig. 3 is the threedimensional model rendering figure of radar antenna of the present invention；
Fig. 4 is the present invention a kind of CAD diagram and y-o-z cross-sectional view of model；
Fig. 5 is the present invention a kind of the x-o-z cross-sectional view and top view of model；
Fig. 6 is a kind of threedimensional model rendering figure of model of the present invention；
Fig. 7 is the CAD diagram of radar antenna array of the present invention, y-o-z cross-sectional view and top view；
Fig. 8 is the threedimensional model rendering figure of radar antenna array of the present invention；
Fig. 9 is parameter size chart of the present invention；
Figure 10 is unit radar antenna water cooled pipeline of the present invention, air-cooled access diagram；
Figure 11 is s11 parameter, gain, the face E and the H surface radiation directional diagram of radar antenna of the present invention；
Figure 12 is s11 parameter, gain, the face E and the H surface radiation directional diagram of radar antenna array of the present invention；
Figure 13 is rectangular pillar s11 parameter and gain diagram under different height in radiating aperture of the present invention, different rectangular
Electric field intensity map under pillar height；
Figure 14 is waveguide coupling slot different length of the present invention, s11 parameter and gain diagram under different in width.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.It should be appreciated that specific embodiment described herein is only to explain this
Invention, only a part of the embodiment of the present invention is not intended to limit the present invention instead of all the embodiments.
As shown in Figure 1, the radar antenna is using selectivity the present invention is based on the CAD diagram of the radar antenna of 3D printing technique
Laser melts 3D printing technique, is integrally formed using metal powder, as shown in Fig. 2 (a), which includes: square flange
10, feed waveguide 20 and radiating aperture 30, the radar antenna are suitable for the radar antenna of K-band (18~27GHz).
Selective laser melt technology be put forward for the first time by German Froounholfer research institute in nineteen ninety-five, the technology be by
The energy of laser, which is converted into thermal energy, forms metal powder, and in the fabrication process, metal powder is heated to form after being completely melt,
Whole process carries out in the Processing Room of inert gas shielding, aoxidizes at high temperature to avoid metal, the gold of final molding
It is high to belong to part consistency, up to 90% or more, the mechanical performance index such as tensile strength are better than casting, even up to arrive forging water
Flat, micro-vickers hardness can be higher than forging, and due to being melted completely in print procedure, dimensional accuracy is higher, and the present invention is real
Applying the metal powder that a 3D printing uses is Al alloy powder, and inert gas is argon gas, and being formed with square flange 10 is lower part
Pedestal, feed waveguide 20 are middle part, and radiating aperture 30 is the radar antenna of upper end, can be according to setting using 3D printing technique
Meter drawing automatic printing goes out required radar antenna shape, and conventional cast or forging technology need mold, and manufacture craft is multiple
Miscellaneous and consistency is lower.
For example, the list that the radar antenna of the embodiment of the present invention uses magnetoelectricity dipole to be formed as electromagnetic wave beam
Member, magnetoelectricity dipole is to invent for 2006, by cleverly coming together to constitute by magnetic dipole and electric dipole
Radar antenna, but do not increase the physical pore size of antenna, the antenna that magnetoelectricity dipole is formed has excellent electrical characteristics, such as wider
Frequency band, stable gain, low-cross polarization, low backward radiation and the almost equal face E and H surface radiation directional diagram.Such as Fig. 2
(a) shown in, the face the y-o-z cross-sectional view and sizing for showing the radar antenna show radiating aperture as shown in Fig. 2 (b)
30 top view of diameter and sizing, as shown in figure 9, the specific data drawing list of above-mentioned sizing is shown, it is right in conjunction with Fig. 1
Radar antenna is specifically described, and square flange 10 is the pedestal of radar antenna, is equipped with hole close to 10 4 angles of square flange,
For the fixed installation of radar antenna, feed waveguide 20 is perpendicular to the central position on the face square flange x-o-y, and in the face xoy
It sets, feed waveguide 20 is in irregular square cylinder, can be seen that 20 inner hollow of feed waveguide referring to Fig. 2 (a), and hollow
Square flange 10 is run through in part, which can form waveguide and be used to feed electromagnetic wave signal to radiating aperture, and
Wind-cooling heat dissipating, the above bending in 20 middle part of feed waveguide, when which can to form radar antenna array by radar antenna, shape
At channel.
Radiating aperture 30 is perpendicular on feed waveguide 20,30 top view of radiating aperture as shown in Fig. 2 (b), the radiating aperture
30 include square metal chamber 301, waveguide coupling slot 302, the first rectangular pillar 303, the second rectangular pillar 304, third square column
Sub 305, square pillar 306, referring to the specific data of Fig. 9 illustrated dimension it is found that the face x-o-y of square metal chamber 301 is positive
Rectangular, in 301 bottom center of square metal chamber, waveguide coupling slot 302 is used to feed electricity to radiating aperture 30 waveguide coupling slot 302
Magnetostatic wave signal, 302 lower section of waveguide coupling slot is hollow, communicates with the hollow space of feed waveguide 20, can see referring to Fig. 2 (a)
Out, the hollow width in 302 lower section of waveguide coupling slot is less than the width of waveguide coupling slot 302, and os is under waveguide coupling slot 302 in figure
Square hollow space edge is designed in this way at a distance from feed waveguide hollow space edge and may advantageously facilitate radar antenna to electromagnetic wave
Reception and transmitting.Waveguide coupling slot 302 and below hollow, are incorporated in one with the hollow space of feed waveguide 20
It rises, forms waveguide, motivate magnetoelectricity dipole, and be conducive to wind-cooling heat dissipating.
As shown in Fig. 2 (b), the first rectangular pillar 303 is with the second rectangular pillar 304 in the same of waveguide coupling slot 302
Side, third square pillar 305 and square pillar 306 have in the other side of waveguide coupling slot 302 referring to Fig. 9 illustrated dimension
Volume data is it is found that the face x-o-y of each rectangular pillar is square, the first rectangular pillar 303 and third square pillar 305, structure
Electric dipole in a pair, the second rectangular pillar 304 and square pillar 306 constitute another pair electric dipole, two pairs of galvanic couples
Extremely son forms gap between the inner wall of square metal chamber 301 respectively, for electromagnetic wave to be coupled to electric dipole, and excitation
Magnetic dipole radiation.First rectangular pillar 303 and the second rectangular pillar 304 constitute a pair of of magnetic dipole, third square pillar
305 and square pillar 306, another pair magnetic dipole is constituted, is used for radiated electromagnetic wave, Fig. 3 (a), (b), (c) show this
The 3D of radar antenna renders figure.
Optionally, referring to Fig. 4 (a), a kind of CAD diagram of model is shown, above-mentioned single radar antenna can be combined into thunder
Up to aerial array, in order to verify combination radar antenna array electromagnetic wave beam Forming ability, Fig. 4 (b) shows a kind of mould
The cross-sectional view of type y-o-z, based on square flange 10 and four feed waveguides 20, combination constitutes a model, four feeds
Waveguide 20 is symmetrical two-by-two, combines, and the following hollow space bending docking in the middle part of four feed waveguides 20 is combined
Hollow space is formed, the hollow space which forms extends downwardly, and runs through square flange 10, and Fig. 5 (b) shows the model
Top view, Fig. 5 (a) show the face model x-o-z cross-sectional view, it can be seen that are equipped with a gap 80, the seam in the face model x-o-z
Gap 80 is used for wind-cooling heat dissipating, based on the model, four radiating apertures 30 is added at the top of the model, that is, may make up radar day
Linear array is surveyed and is imitated to the model performance if Fig. 6 (a), (b), (c), (d) show model 3D rendering figure
Very, obtaining the results show that have good electromagnetic wave beam Forming ability.
Optionally, a kind of CAD diagram of radar antenna array is shown referring to Fig. 7 (a), Fig. 7 (b) shows the radar day
The face the y-o-z cross-sectional view of linear array, Fig. 7 (c) show the top view of radar antenna, which includes supporter
40, pedestal 50 and 2*2 radiating aperture combine 60, it can be seen that on the basis of model shown in Fig. 6, constitute the thunder of Fig. 7
Up to aerial array, as shown in Fig. 7 (b), it can be seen that combine 60 by 2*2 radiating aperture and combined with 2*2 feed waveguide 20 and formed
Water-cooling is walked and carried out to narrow lower wide channel 70, the 70 top arrow path of channel for water cooled pipeline, and the wide road in lower part is used for wind
Cold heat dissipation, the hollow space of entire radar antenna array are used to feed electromagnetic wave signal and wind-cooling heat dissipating to radiating aperture, such as
Fig. 8 (a), (b), (c), (d) show the 3D rendering figure of radar antenna array model.
Optionally, referring to Fig. 9 parameter size chart, the specific size icon of Fig. 2, Fig. 4, Fig. 5, Fig. 7 are shown, in conjunction with each
Shown in figure, each parameter is respectively as follows: in table
A: the length of third square pillar 305；B: the width of third square pillar 305；Can simple its excess-three it is rectangular
Pillar length is equal with width and third square pillar 305；
H1: the depth of radiating aperture 30 is also the height of four rectangular pillars；H2: in 302 lower section of waveguide coupling slot
Empty Partial Height；
L1: the height from 10 bottom of square flange to 20 hollow space top of feed waveguide, abbreviation waveguide pillar height；L2: feedback
Length of 20 inner wall of electric waveguide to waveguide coupling slot 302；L3: the height of upper end vertical component in 40 hollow space of supporter；L4:
The height for the sloping portion being connect in 40 hollow space of supporter with vertical component；L5: the height of 40 vertical component of supporter；
L6: the height for the italicized item that supporter 40 is connect with vertical component；L7: the height of 80 lower inclined portion of gap；L8: feed
The height of 20 bending part of waveguide；
La: the length of radiating aperture 30；Lb: the width of radiating aperture 30；OS: 302 lower section hollow space of waveguide coupling slot
Edge is at a distance from feed waveguide hollow space edge；
The width in gap between s1: the square pillar 306 and waveguide coupling slot 302；S2: the square pillar 306 with
The width in gap between 30 inner wall of radiating aperture；
Width between two waveguide coupling slot central points on the direction y in the combination of sa:2*2 radiating aperture 30；Sb:2*2
Width between two waveguide coupling slot central points on the direction x in the combination of radiating aperture 30；Sl: the length of waveguide coupling slot 302
Degree；The width of sw waveguide coupling slot 302；
W1: channel 70 extends the width of entrance to 40 hollow space of supporter；W2: the bottom width in gap 80；W3: gap
80 middle and upper part width；Bending part is in y-direction between two hollow space central points in the combination of wa:2*2 feed waveguide 20
Width；The bending part width between two hollow space central points in the x direction in the combination of wb:2*2 feed waveguide 20.
Optionally, referring to Fig.1 0 (a), (b), (c) show and multiple groups radar antenna array combine in use, water cooling
The schematic diagram for walking schematic diagram and air-cooled channel of pipeline, it can be seen that the present invention implement in radar antenna realize water cooling and
Air-cooled mode, according to actual test, the radiating mode of the program makes the amount of heat generated in radar antenna use rapid
It distributes, ensure that the normal work of radar antenna, and do not need additionally to increase water cooling air-cooled radiating device.
Optionally, 1 (a) the s11 parameter of single radar antenna is shown referring to Fig.1, it should be noted that the present invention is implemented
All emulation in example all use Asoft HFSS15.0 (3 D electromagnetic simulation software) to carry out, using Agilent E8363C
PNA Network Analyzer (Agilent E8363C PNA Network Analyzer) obtains s parameter, the far-field characteristic of radar antenna
It is measured in anechoic room, Figure 11 (a) reflects analogue simulation knot of the s11 parameter in radar antenna 19~25GHz band operation
Fruit and actual measured results, wherein simulation (simulation) is analogue simulation line, and measurement (measurement) is practical
Line is measured, Frequency is radar antenna working frequency；Figure 11 (b) shows radar antenna and obtains at 24.2GHz
The gain of 10.76dBi, wherein simulation (simulation) is analogue simulation line, and measurement (measurement) is actual measurement
Line, Gain are gain；Figure 11 (c) and Figure 11 (d) show radar antenna on the face E and the face H of 66 ° of half-power beam widths
With symmetric radiation mode, cross polarization is far below -30dB, and wherein Theta (degree) refers to beam angle, Radiation
Pattern (dB) refers to radiation direction, and Sim co-pol refers to the main polarization line of analogue simulation, for the long solid line of black in figure, Sim x-
Pol analogue simulation cross polarization line, for the short solid line of black in figure, Mea co-pol refers to the main polarization line of actual measurement, is white in figure
Color dot composition, close to the long solid line of black, Mea x-pol refers to actual measurement cross polarization line, blackens color dot group for the short solid line of black
At close to the short solid line of black.
Optionally, it 2 (a) shows in radar antenna array work in 19.5GHz~22GHz, measures referring to Fig.1
Impedance bandwidth, s11 parameter generate 1.5GHz frequency displacement, wherein simulation (simulation) be analogue simulation line,
Measurement (measurement) is actual measurement line；Figure 12 (b) is shown in emulation, when maximum gain appears in 20GHz, and
When in actual measurement, maximum gain appears in 25GHz, wherein simulation (simulation) is analogue simulation line,
Measurement (measurement) is actual measurement line；Figure 12 (c) and Figure 12 (d) show radar antenna perpendicular to radiating aperture
On 30 directions, there is symmetric radiation mode on the face E and the face H of 26 ° of beam angles, cross polarization is far below -30dB, wherein
Theta (degree) refers to that beam angle, Radiation pattern (dB) refer to radiation direction, and Sim co-pol refers to analogue simulation
Main polarization line, for the long solid line of black in figure, Sim x-pol analogue simulation cross polarization line, for the short solid line of black in figure, Mea
Co-pol refers to the main polarization line of actual measurement, forms for white point in figure, and close to the long solid line of black, Mea x-pol refers to actual measurement
Cross polarization line blackens color dot composition for the short solid line of black, close to the short solid line of black.
Optionally, 3 (a) s11 parameter under four rectangular pillar different heights in radiating aperture 30 is shown referring to Fig.1,
When hl (pillar height) is 2.5 millimeters, reach widest impedance；Under normal circumstances, hl (pillar height) influence of four rectangular pillars is worn
The electric field strength in overshoot aperture 30, and then the gain of radar antenna is influenced, big gain is done in order to obtain, the column of rectangular pillar
Height should be the electromagnetic wavelength of a quarter, and corresponding in the embodiment of the present invention to be 2.5 millimeters of hl (pillar height), in reality
When measurement, Figure 13 (b) is shown under different hl (pillar height), the gain that radar antenna obtains, it can be seen that when pillar height is 3.5 millimeters
When, the gain that radar antenna obtains is maximum, and Figure 13 (c), (d), (e) respectively illustrate radar antenna in 20.4GHz, work as hl
2.5 millimeters of (pillar height), 3.5 millimeters of hl (pillar height) and at 4.5 millimeters of hl (pillar height) across the electric field strength of radiating aperture 30, when
When hl (pillar height) is 3.5 millimeters, the electric field intensity value across radiating aperture 30 is maximum, then the increasing that corresponding radar antenna obtains
It is beneficial maximum.
Optionally, radar antenna is fed by waveguide coupling slot 302, which can regard capacitive couplings slot, thunder as
The sl (length) of frequency response and waveguide coupling slot 302 up to antenna is inversely proportional, directly proportional to sw (width), and referring to Fig.1 4 (a)
Show the s11 parameter of the radar antenna under different sl (length) of waveguide coupling slot 302；Figure 14 (b) shows waveguide coupling slot
302 under different sl (length) radar antenna gain；Figure 14 (c) shows waveguide coupling slot 302 under different sw (width)
The parameter of radar antenna；Figure 14 (d) shows the gain of the radar antenna under different sw (width) of waveguide coupling slot 302.
The radar antenna and radar antenna array based on 3D printing technique of design of the embodiment of the present invention, utilize 3D printing
Technology is integrally formed, and produces the radar antenna of hollow structure, in design just by water-cooling channel and air-cooled channel heat sink conception
Design is entered, this is that conventional cast or forging are impossible, while the radar antenna produced is according to analogue simulation and reality
Border measurement shows ideal s11 parameter, gain, radiation mode and wave beam stability, and does not have to individually be equipped with heat dissipation dress
It sets, it is greatly convenient for users to use.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method for including a series of elements not only includes those elements, but also including
Other elements that are not explicitly listed, or further include the element intrinsic for this process, method.
Above to a kind of radar antenna and radar antenna array based on 3D printing technique provided by the present invention, carry out
It is discussed in detail, used herein a specific example illustrates the principle and implementation of the invention, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (7)
1. a kind of radar antenna based on 3D printing technique, which is characterized in that the radar antenna is melted using selective laser
3D printing technique is integrally formed using metal powder, and the radar antenna includes: square flange, feed waveguide and radiating aperture
Diameter；
The feed waveguide perpendicular on the square flange, in the middle part of the feed waveguide more than, close to the radiating aperture end
Bending, the feed waveguide are hollow；
On the square flange, correspond to the feed waveguide hollow space and be equipped with square groove, in size and the feed waveguide
Empty part is equal, the square groove and the feed waveguide hollow space, forms waveguide and for feeding electromagnetism to radiating aperture
Wave signal and wind-cooling heat dissipating；
The radiating aperture perpendicular on the feed waveguide, the radiating aperture include square metal chamber, waveguide coupling slot with
And four rectangular pillars, four rectangular pillars are symmetrical along the waveguide coupling slot long axis direction two sides, the waveguide
Coupling slot hollow, hollow portion with the feed waveguide below the square metal chamber bottom center, the waveguide coupling slot
Split-phase is logical, forms waveguide, excitation magnetoelectricity dipole and is used for wind-cooling heat dissipating；
Two rectangular pillars ipsilateral along the waveguide coupling slot short-axis direction in four rectangular pillars constitute a pair of of electricity
Dipole constitutes two pairs of electric dipoles altogether, and two pairs of electric dipoles form gap between the square metal cavity wall respectively, uses
In electromagnetic wave is coupled to electric dipole, and excitation magnetic dipole radiation；
Two rectangular pillars ipsilateral along the waveguide coupling slot long axis direction in four rectangular pillars constitute a pair of of magnetic
Dipole constitutes two pairs of magnetic dipoles altogether, and the waveguide coupling slot is used to feed electromagnetic wave signal to radiating aperture, promotes electromagnetism
Wave is coupled to electric dipole.
2. radar antenna according to claim 1, which is characterized in that the square metal cavity volume is less than the radiating aperture
Diameter volume, the square metal chamber height are less than the radiating aperture height, the upper surface of the square metal chamber and the spoke
Perforation diameter upper surface flushes, and the rectangular pillar height is equal with the square metal chamber height.
3. radar antenna according to claim 1, which is characterized in that hollow width is less than below the waveguide coupling slot
The width of the waveguide coupling slot, for promoting reception and transmitting of the radar antenna to electromagnetic wave.
4. a kind of radar antenna array based on 3D printing technique, which is characterized in that the radar antenna array top includes: to adopt
The aerial array constituted with four feed waveguides and radiating aperture as described in claim 1；
It include supporter in the middle part of the radar antenna array, lower part includes pedestal, and the supporter is hollow, with the feed waveguide
Hollow space is equal in magnitude and is connected with each other；
On the pedestal, corresponds to the supporter hollow space and be equipped with square groove, size and the supporter hollow portion split-phase
Deng, the square groove and the supporter hollow space and the feed waveguide hollow space, waveguide is formed simultaneously for air-cooled
Heat dissipation.
5. radar antenna array according to claim 4, which is characterized in that by four feed waveguides and the spoke
Two in perforation diameter are combined using opposite connection, component parts one, the opposite connection, i.e. one of them described feed
Waveguide and the radiating aperture are relative to feed waveguide described in another and radiating aperture overturning 180 degree, by two
The radiating aperture docking, then two feed waveguides form up-narrow and down-wide channel.
6. radar antenna array according to claim 4, which is characterized in that by four feed waveguides and the spoke
Other two in perforation diameter is also combined using opposite connection, and component one and component two are connected in parallel by component parts two,
Component one and the channel of component two are completely coincident, and water-cooling is walked and carried out to the upper part of channel arrow path for water cooled pipeline,
The wide road in lower part is used for wind-cooling heat dissipating.
7. radar antenna array according to claim 4, which is characterized in that the component one connects parallel with the component two
When connecing, the first gap, the support are equipped between the radiating aperture in radiating aperture and the component two in the component one
Body is equipped with the second gap, second gap and the first gap size phase close to the part on the array radar antanna top
Deng and interconnect, first gap and second gap are used for wind-cooling heat dissipating.
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