CN106953157A - A kind of antenna assembly for radar sensor - Google Patents
A kind of antenna assembly for radar sensor Download PDFInfo
- Publication number
- CN106953157A CN106953157A CN201710250046.2A CN201710250046A CN106953157A CN 106953157 A CN106953157 A CN 106953157A CN 201710250046 A CN201710250046 A CN 201710250046A CN 106953157 A CN106953157 A CN 106953157A
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- Prior art keywords
- antenna
- antenna element
- point
- distributing point
- radar sensor
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/525—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between emitting and receiving antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The present invention discloses a kind of antenna assembly for radar sensor, including printed circuit board (PCB), more than one group of antenna element is disposed with the bottom plate of printed circuit board (PCB), every group of antenna element includes reception antenna, transmitting antenna, radio circuit is disposed with the top plate of printed circuit board (PCB), every group of antenna element is respectively arranged in the both sides of bottom plate, feeding transmission unit is additionally provided with bottom plate, feeding transmission unit extends to the distributing point of antenna element the position of target distributing point in bottom plate to radio circuit region direction, extended to after top plate and be connected with radio circuit by target distributing point via.The present invention has the advantages that simple and compact for structure, feeding transmission connects up low cost, small volume needed for simple and device.
Description
Technical field
The present invention relates to be used for radar sensor in millimetre-wave radar technical field, more particularly to a kind of millimetre-wave radar
Antenna assembly.
Background technology
The electromagnetic wavelength of millimetre-wave radar transmitting is usually several millimeters, for the antenna size of identical bore, millimeter wave day
The wave beam of line is narrower, and gain is higher, and it has higher angle measurement and range accuracy, therefore is widely used in every field
In, typical application field such as automobile active safety and region security protection etc..Millimetre-wave radar be by transmitting antenna come
Launch frequency electromagnetic waves, then by the echo-signal of reception antenna reception target, and then pass through mixing, zero intermediate frequency amplification, intermediate frequency
The information of the circuit output targets such as amplification, AD samplings, signal transacting.Millimeter wave thunder is received using the single-shot list of CW with frequency modulation system
Danone enough obtains the velocity information of target, and the angle information of target can also be then obtained using antennas of receiving more.
Radar sensor is the radiation by antenna to cover area to be protected as the critical piece of millimetre-wave radar
Domain.An important parameter for characterizing the radiation characteristic of antenna is the antenna pattern of antenna, and the main beam of antenna pattern is
The wave beam of wave beam, transmitting antenna and reception antenna then determines the search coverage of radar sensor.Millimetre-wave radar sensor exists
In practical application, zone perimeters protection is such as applied to, usually requires that transmitting antenna has the radiation characteristic of narrow beam and high-gain.
In existing millimetre-wave radar antenna, transmitting antenna and reception antenna are typically to use single feeding classification, transmitting antenna and
The distributing point of reception antenna is located at the both sides of radio frequency circuit board center line, then direct by the distributing point of transmitting antenna, reception antenna
Mouth is fed by two of feeding transmission structural transmission to radio circuit.But in above-mentioned millimetre-wave radar antenna, transmitting antenna,
It is generally distant between the distributing point of reception antenna and the two of radio circuit feed mouths, directly from transmitting antenna, receive day
Line is transferred to up to that will cause that feeding transmission line is long during rf processing circuitry, is caused transmission line wiring complexity in antenna assembly, is entered
And can make it that the volume of whole circuit board is big, structure is not compact, while also increasing the cost of millimetre-wave radar sensor.
The content of the invention
The technical problem to be solved in the present invention is that：The technical problem existed for prior art, the present invention provides one
Plant simple and compact for structure, feeding transmission and connect up low cost, the day for radar sensor of small volume needed for simple and device
Line apparatus.
In order to solve the above technical problems, technical scheme proposed by the present invention is：
Arranged in a kind of antenna assembly for radar sensor, including printed circuit board (PCB), the bottom plate of the printed circuit board (PCB)
There is more than one group of antenna element, antenna element described in every group includes reception antenna, transmitting antenna, the top of the printed circuit board (PCB)
Radio circuit is disposed with laminate, antenna element described in every group is respectively arranged on the both sides of the bottom plate, the bottom plate
Be additionally provided with feeding transmission unit, the feeding transmission unit by the distributing point of the antenna element in the bottom plate to institute
The position that radio circuit region direction extends to target distributing point is stated, the top plate is extended to by target distributing point via
It is connected afterwards with the radio circuit.
As a further improvement on the present invention：Antenna element described in every group corresponds to the end feedback being made up of end feedback antenna respectively
Antenna element, the center-fed antenna unit being made up of center-fed antenna, the distributing point connection feed of the end feedback antenna element are passed
Defeated unit, the distributing point via of the center-fed antenna unit is extended to after the top plate to be connected with the radio circuit.
As a further improvement on the present invention：The transmission terminal position of the feeding transmission unit is to feed target
Point via is when extending to the top plate, is in the designated area where the radio circuit.
As a further improvement on the present invention：The end feedback antenna element includes multiple end-fed arrays being connected in parallel day
Line, the center-fed antenna unit includes multiple middle feedback array antennas being connected in parallel.
As a further improvement on the present invention：The center-fed antenna unit is arranged in the printing electricity with the radio circuit
The homonymy of road plate.
As a further improvement on the present invention：Position where the center-fed antenna unit is by the center-fed antenna unit
Distributing point via when extending to the top plate, be in the designated area where the radio circuit.
As a further improvement on the present invention：First main feed electric network of the end feedback antenna element including horizontal direction,
Multiple first point of feeding network with identical structure and for vertical direction, the left and right part phase of the first main feed electric network
For end-feed point symmetry, the microstrip antenna element of first point of feeding network middle and upper part point and the microstrip antenna of lower part
Array element is symmetrical.
As a further improvement on the present invention：Second main feed electric network of the center-fed antenna unit including horizontal direction,
It is multiple with identical structure and for vertical direction second point of feeding network, the left-right parts of the second main feed electric network, on
Lower part is respectively relative to middle part feed point symmetry, the microstrip antenna element of second point of feeding network middle and upper part point and bottom
Point microstrip antenna element is symmetrical and opposite in phase, be additionally provided with transmission at the feed-in of second point of feeding network middle and upper part point
Line, is fed with the upper part for keeping second point of feeding network with lower part with phase.
As a further improvement on the present invention：The feeding transmission unit is feeding transmission line.
As a further improvement on the present invention：High frequency substrate, the antenna element, feed are additionally provided with the bottom plate
Transmission unit is printed on the high frequency substrate.
Compared with prior art, the advantage of the invention is that：
1）The present invention is used for the antenna assembly of radar sensor, and every group of antenna element is respectively arranged in the both sides of printed circuit board (PCB),
The isolation between high frequency transmission circuit can be increased, and then improve the detectivity of radar sensor, while being passed by feeding
Defeated unit first extends the distributing point of antenna element in bottom plate to radio circuit region direction so that the mesh after extension
Marking distributing point can be close to radio circuit, then extends to after top plate and be connected with radio circuit from the direct via of target distributing point,
It can shorten in antenna assembly that bottom antenna element is to the transmission line between top layer radio circuit, while so that transmission wiring is simple
It is single, effectively reduce the volume of device and reduce cost needed for device；
2）The present invention is used for the antenna assembly of radar sensor, further by causing transmitting antenna, reception antenna using different
Feeding classification, compared to traditional antenna assembly use single feeding classification, by increasing capacitance it is possible to increase the flexibility of antenna assembly, carry
High resource utilization ratio；Antenna element is presented simultaneously for end, the feedback for presenting antenna element will be held by connecting feeding transmission unit
Electricity point extends to target distributing point in bottom plate to radio circuit region direction, from the direct via extension of target distributing point
To top plate, for center-fed antenna unit, then distributing point via is directly extended into top plate, can with reference to different feeding classifications
Shorten antenna element to the transmission line between radio circuit so that transmission wiring is simple；
3）The present invention is used for the antenna assembly of radar sensor, and every group of antenna element is using end feedback antenna element, center-fed antenna list
On the basis of member, end feedback antenna element is extended distributing point to radio circuit direction by feeding transmission unit, center-fed antenna list
Member is arranged in the same side with radio circuit, and makes the target distributing point of feeding transmission unit transmission terminal, center-fed antenna list simultaneously
The position of the distributing point of member is extended to after top plate in the designated area where radio circuit for hole, can be to greatest extent
Shorten the antenna element from bottom to the length of transmission line between the radio circuit of top layer, substantially reduce antenna assembly transmission wiring
Complexity so that the compact conformation of antenna assembly.
Brief description of the drawings
Fig. 1 is the principle schematic diagram for the antenna assembly that the present embodiment is used for radar sensor.
Fig. 2 is the concrete structure schematic diagram of antenna element in the present embodiment.
Fig. 3 is the pitching face feed network structures schematic diagram that the present embodiment middle-end presents antenna element.
Fig. 4 is the azimuth plane feed network structures schematic diagram that the present embodiment middle-end presents antenna element.
Fig. 5 is the pitching face feed network structures schematic diagram of center-fed antenna unit in the present embodiment.
Fig. 6 is the azimuth plane feed network structures schematic diagram of center-fed antenna unit in the present embodiment..
Fig. 7 is the antenna pattern result schematic diagram that the present embodiment middle-end presents antenna element.
Fig. 8 is the antenna pattern result schematic diagram of center-fed antenna unit in the present embodiment.
Marginal data：1st, bottom plate；11st, antenna element；111st, end feedback antenna element；112nd, center-fed antenna unit；12nd, present
Electrical transmission unit；2nd, top plate；21st, radio circuit.
Embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
Limit the scope of the invention.
As shown in Figure 1, 2, the present embodiment includes printed circuit board (PCB), printed circuit board (PCB) for the antenna assembly of radar sensor
Bottom plate 1 be disposed with more than one group of antenna element 11, every group of antenna element 11 includes reception antenna, transmitting antenna, printing
The top plate 2 of circuit board is disposed with the radio circuit 21 for handling high-frequency signal, top plate 2 and is specifically additionally provided with signal
Manage circuit etc., every group of antenna element 11 is respectively arranged in being additionally provided with feeding transmission list on the both sides of printed circuit board (PCB), bottom plate 1
Member 12, feeding transmission unit 12 prolongs the distributing point of antenna element 11 in bottom plate 1 to the region direction of radio circuit 21
The position of target distributing point is extended, is extended to after top plate 2 and be connected with radio circuit 21 by target distributing point via.
Every group of antenna element 11 of the present embodiment is respectively arranged in the both sides of printed circuit board (PCB), i.e. transmitting antenna, reception antenna
High frequency printed board center line both sides are distributed at certain intervals, by increasing capacitance it is possible to increase the isolation between high frequency transmission circuit, and then improve
The detectivity of radar sensor, while by feeding transmission unit 12 by the distributing point of antenna element 11 first in bottom plate 1
On extend to the region direction of radio circuit 21 so that target distributing point after extension can close to radio circuit 21, then from
The direct via of target distributing point is extended to after top plate 2 and is connected with radio circuit 21, can shorten bottom antenna in antenna assembly
Unit 11 is to the transmission line between top layer radio circuit 21, while so that transmission wiring is simple, effectively reduce the volume of device with
And reduce cost needed for device.
As shown in figure 1, every group of antenna element 11 of the present embodiment specifically corresponds to present day by the end that end feedback antenna is constituted respectively
Line unit 111, the center-fed antenna unit 112 being made up of center-fed antenna, end feedback antenna element 111 have end-feed point（First
Distributing point）, center-fed antenna unit 112 is with middle part distributing point（Second distributing point）, end feedback antenna element 111, center-fed antenna list
Member 112 is printed in the bottom plate 1 of high frequency printed board, and its middle-end feedback antenna element 111 includes multiple end feedbacks being connected in parallel
Array antenna, for radiating high frequency transmission signal, as transmitting antenna, center-fed antenna unit 112 includes multiple be connected in parallel
Middle feedback array antenna, for receiving the echo-signal reflected in target, as reception antenna.Sent out in every group of antenna element 11
An antenna for end feedback feeding classification can specifically be set according to the actual requirements by penetrating antenna, reception antenna, and another is middle feedback feedback
Antenna electrically.Transmitting antenna, reception antenna use different feeding classifications, compared to traditional antenna assembly using single
Feeding classification, by increasing capacitance it is possible to increase the flexibility of antenna assembly, improve resource utilization ratio.
In the present embodiment, the distributing point for specifically presenting antenna element 111 by end connects feeding transmission unit 12, wherein feed is passed
The distributing point of antenna element 111 is presented in the initiating terminal connection end of defeated unit 12, and transmission terminal is the position of target distributing point so that logical
The end-feed point for presenting antenna element 111 will be held by crossing feeding transmission unit 12（First distributing point）To radio frequency electrical in bottom plate 1
The region direction of road 21 extends to target distributing point（3rd distributing point）Position, top layer is extended to by the 3rd distributing point via
It is connected after plate 2 with radio circuit 21；The middle part distributing point of center-fed antenna unit 112（Second distributing point）Direct via extends to top
It is connected after laminate 2 with radio circuit 21.
In the present embodiment, feeding transmission unit 12 is feeding transmission line, i.e., the distributing point of antenna element 11 is first passed through into one
Transfer transition extends to top plate 2 to the position of target distributing point, then by the direct via of target distributing point after section feeding transmission line
The distributing point of radio circuit 21 is connected to afterwards.Referring to Fig. 1, the first distributing point and center-fed antenna unit of end feedback antenna element 111
112 the second distributing point is laid out in printed circuit board (PCB)（PCB printed boards）Bottom plate 1 both sides, processing radar high-frequency signal
Radio circuit 21 is laid out in the lower right field of PCB printed boards top plate 2, if the first distributing point is directly arrived by the via that metallizes
Top plate 2 where high frequency printed board radio circuit, then need to be connected to radio circuit 21 by one section of very long transmission line again
Distributing point, printing back transmission line cabling can be caused complicated, or even disturb whole printed circuit board layout so that day knot
Structure is not compact.The present embodiment will be held by feeding transmission unit 12 by setting feeding transmission unit 12 in bottom plate 1 and present antenna
First distributing point feeding transmission of unit 111 is transitioned at the 3rd distributing point of bottom plate 1, and then after behind hole to top plate 2
It is connected to the distributing point of radio circuit 21 so that the feed between the feed mouth and radio circuit 21 of end feedback antenna element 111 is passed
Defeated wiring is simple, and then causes the compact conformation of antenna assembly.
Every group of antenna element 11 of the present embodiment corresponds to end feedback antenna element 111, center-fed antenna unit 112 respectively so that
Transmitting antenna, reception antenna use different feeding classifications, antenna element 111 are presented simultaneously for end, by connecting feeding transmission
Unit 12 will hold the first distributing point for presenting antenna element 111 to be extended in bottom plate 1 to the region direction of radio circuit 21
3rd distributing point, top plate 2 is extended to from the 3rd direct via of distributing point, then directly will feed for center-fed antenna unit 112
Point via extends to top plate 2, and antenna element 11 can be shortened to the transmission between radio circuit 21 with reference to different feeding classifications
Line so that transmission wiring is simple.
In the present embodiment, the transmission terminal position of feeding transmission unit 12 is that target distributing point via is extended into top
During laminate 2, in the designated area for being at the place of radio circuit 21, target distributing point is extended to especially by metallization via
Top plate 2.As shown in figure 1, the position of the transmission terminal position, as the 3rd distributing point of the present embodiment feeding transmission unit 12
Put, the 3rd distributing point via is extended to after top plate 2 in the designated area A where radio circuit 21, wherein region A be with
Rectangular area centered on the position of radio circuit 21, so that transmission wiring can be facilitated to radio circuit 21, contracting from the 3rd distributing point
Short transmission line length.Region A sizes and structure can be set according to the actual requirements.
In the present embodiment, center-fed antenna unit 112 is arranged in the homonymy of printed circuit board (PCB) with radio circuit 21 so that therefrom
Present antenna element 112 short to the transmission range between radio circuit 21, be easy to implement wiring, antenna element is presented with reference to above-mentioned end
111 are extended to after the 3rd distributing point by feeding transmission unit 12, and top plate 2 and radio circuit 21 are extended to by the 3rd distributing point
Connection, enables to that the integral transmission line of antenna assembly is short, transmission wiring is simple.
In the present embodiment, the position where center-fed antenna unit 112 is that the distributing point of center-fed antenna unit 112 is passed through into mistake
When hole extends to top plate 2, in the designated area for being at the place of radio circuit 21, the distributing point of center-fed antenna unit 112
Specific is directly extended to by the via that metallizes after top plate 2 be connected with radio circuit 21.As shown in figure 1, being presented in the present embodiment
The distributing point of antenna element 112（Second distributing point）, via extended to after top plate 2 in the specified area where radio circuit 21
In the A of domain, wherein region A is the rectangular area centered on the position of radio circuit 21, so as to can conveniently be transmitted from the second distributing point
Radio circuit 21 is routed to, shortens length of transmission line.
Using said structure, every group of antenna element 11 corresponds to end feedback antenna element 111, center-fed antenna unit 112 respectively,
End feedback antenna element 111 is extended distributing point to the direction of radio circuit 21 by feeding transmission unit 12, center-fed antenna unit 112
The same side is arranged in radio circuit 21, and makes the target distributing point of the transmission terminal of feeding transmission unit 12, center-fed antenna simultaneously
The position of the distributing point of unit 112 is extended to after top plate 2 in the designated area where radio circuit 21 for hole, can be most
The shortening of limits substantially reduces transmission from the antenna element 11 of bottom to the length of transmission line between the radio circuit 21 of top layer
Wiring complexity, so that antenna device arrangement is compact, reduces antenna assembly volume and required cost.
In the present embodiment, antenna is specifically array antenna in every group of antenna element 11, and array antenna can be paster day
Linear array antenna or slot antenna array etc., array antenna are connected with microstripline feed network and carry out impedance matching, antenna
The polarization mode of array element is specifically as follows inclined polarization, horizontal polarization, vertical polarization or circular polarisation etc.；The wave beam of radiant body is specific
For narrow beam, wave beam is specifically set as that the half power lobe width in azimuth plane is less than the first predetermined threshold value（The present embodiment has
Body takes 20 degree）, half power lobe width of the wave beam in pitching face is less than the second predetermined threshold value（The present embodiment specifically takes 15 degree）,
So that can also make it that radar detection width is unlikely to diffusion when away from radar position farther out while higher antenna gain is obtained
It is too wide, disclosure satisfy that zone perimeters protection etc. needed for narrow beam, the application demand of high-gain.
In the present embodiment, the wave beam of every group of antenna element 1 is the main beam of antenna pattern, other in addition to main beam
Wave beam is secondary lobe, specific setting minor level the smaller than the maximum level of main beam the 3rd default threshold in pitching face and azimuth plane
Value（The present embodiment specifically takes 18dB）More than, to be significantly reduced the interference of other targets outside main beam.
As shown in Figure 2,3, 4, the present embodiment middle-end feedback antenna element 111 includes the first main feed electric network of horizontal direction
A11, it is multiple with identical structure and for vertical direction first point of feeding network A12, the first main power feed network A 11 it is left and right
Part is relative to end-feed point（First distributing point）Symmetrically, the microstrip antenna element of first point of feeding network middle and upper part point is with
Partial microstrip antenna element is symmetrical.The present embodiment specifically includes the first main power feed network A 11 of 1 horizontal direction and 5 hang down
Nogata is to mutually isostructural second point of feeding network A12, because aerial array is using end feedback feeding classification, the first main power feed
Network A 11 is symmetrical on the first distributing point；The radiance of microstrip antenna element is good, section and low cost, and Yi Yugao
Audio signalprocessing circuit is integrated, and feedback antenna element 111 in the present embodiment end is specifically comprising 40 microstrip antenna elements, each micro-strip day
Linear array member is connected with each other by microstrip line, and is finally connected with the first main power feed network A 11, and antenna element 111 is presented from end
Distributing point feed-in energy by the pro rate calculated to 40 microstrip antenna elements, and radiated with horizontal polarization mode
Go out, the directional diagram of horizontal plane is mainly determined by the distribution ratio of the first main power feed network A 11, the directional diagram of vertical plane then it is main by
First point of feeding network A12 distribution ratio determines that the minor level in the present embodiment on two faces is taken as -20dB.End feedback day
Microstrip antenna element number specifically can also be according to radar in the rectangular array structure of line unit 111 main lobe width and gain
Set etc. parameter.
As shown in figure 3, being carried out by taking the left-half A21 of the first main power feed network A 11 as an example to the first main power feed network A 11
Illustrate, A21 is distributed by designated ratio and in phase the energy of the first distributing point by impedance transformation line A2121 ~ A2124
Into A211 ~ A213 points of feeding networks, while having carried out one section of resistance before the first distributing point enters the first main power feed network A 11
Anti- matching, it is to specify size to keep input resistant matching at the first distributing point（The present embodiment specifically takes 50 ohm）, it is assigned to 3
The specified current flow ratio of point feeding network specifically can be according to minor level（The present embodiment specifically takes -20dB）Enter according to Taylor's formula
Row calculating is obtained, and the distribution ratio of point feeding network from left to right is specially 0.54：0.83：1.
As shown in figure 4, first point of feeding network A12 of the present embodiment specifically has 8 microstrip antenna elements and impedance becomes
Thread-changing, wherein each bay is connected in series and symmetrical above and below, bay be both radiation array element simultaneously and impedance transformation line,
So that can either radiant electromagnetic energy can play impedance matching again.With first point of feeding network A12 the latter half A13
Exemplified by, A13 is by impedance transformation line A121-A124 the energy inputted from the matrix ports of the first main power feed network A 11 by finger
Certainty ratio and being assigned in 4 bays with phase, the specified current flow ratio for being assigned to 4 bays specifically can be according to pair
Valve level（The present embodiment specifically takes -20dB）Calculated according to Taylor's formula, point of point feeding network from top to bottom
Proportioning is specially 0.54：0.67：0.86：1.
As shown in Fig. 2,5,6, second main power feed network B 11 of the present embodiment center-fed antenna unit 112 including horizontal direction,
Multiple second point of feeding network B12 with identical structure and for vertical direction, the left-right parts of the second main power feed network B 11,
Top and the bottom are respectively relative to middle part distributing point（Second distributing point）Symmetrically, the micro-strip of second point of feeding network B12 middle and upper part point
The microstrip antenna element of bay and lower part is symmetrical and opposite in phase, at the feed-in of second point of feeding network middle and upper part point also
Transmission line is provided with, is fed with the upper part for keeping second point of feeding network with lower part with phase.The present embodiment specifically includes 1
The main power feed network B 11 of horizontal direction has mutually isostructural point of feeding network B12 with 5 vertical direction, due to aerial array
Present feeding classification in, main power feed network B 11 on above and below the second distributing point, left-right symmetric, second point of feeding network B12
It is symmetrical above and below, while second point of feeding network B12 upper and lower two parts opposite in phase, and added at the feed-in of top half
One and half guided wave long transmission lines, to keep upper and lower two parts bay with mutually feed；The present embodiment center-fed antenna unit 112
Consistent with end feedback antenna element 111, specific comprising 40 microstrip antenna elements, each microstrip antenna element is carried out by microstrip line
It is connected with each other, and is finally connected with the second main power feed network B 11, therefrom presents the energy of the second distributing point feed-in of antenna element 112
Amount is radiate, the side of horizontal plane with horizontal polarization mode as in the pro rate calculated to 40 microstrip antenna elements
Mainly determined to figure by the distribution ratio of the second main power feed network B 11, the directional diagram of vertical plane is main by second point of feeding network B12
Distribution ratio determine that the minor level in the present embodiment on two faces is taken as -20dB.The rectangle battle array of center-fed antenna unit 112
Microstrip antenna element number equally can specifically be set according to parameters such as the main lobe width of radar and gains in array structure.
As shown in figure 5, by taking the left-half B21 of the second main power feed network B 11 as an example, B21 passes through impedance transformation line
The energy of second distributing point is assigned to by designated ratio and in phase in 3 points of feeding networks by B2121-B2124, and the second feedback
Input resistant matching at electric point is to specify size（The present embodiment specifically takes 50 ohm）, it is assigned to the finger of 3 points of feeding networks
Determining current ratio specifically can be according to minor level（The present embodiment takes -20dB）Calculated according to Taylor's formula, from a left side to
The distribution ratio of right point feeding network is specially 0.54：0.83：1.
As shown in fig. 6, second point of feeding network B12 of the present embodiment specifically has 8 microstrip antenna elements and impedance becomes
Thread-changing, upper 4 bays in part are connected in series, and lower 4 bays in part are connected in series, the bay of upper and lower part
Be connected in parallel and symmetrically, bay be both radiation array element simultaneously and impedance transformation line so that can either electromagnetic radiation wave energy
Amount can play impedance matching again.By taking second point of feeding network B12 top half B13 as an example, B13 passes through impedance transformation line
The energy inputted from the matrix ports of the second main power feed network B 11 is assigned to 4 by B121-B124 by designated ratio and with phase
In bay, the specified current flow ratio for being assigned to 4 bays specifically can be according to minor level（The present embodiment takes -20dB）
Calculated according to Taylor's formula, the distribution ratio of point feeding network from top to bottom is specially 0.54：0.67：0.86：1.
The antenna pattern of end feedback antenna element 111 obtained by being illustrated in figure 7 in the specific embodiment of the invention, wherein
Solid line represents the antenna pattern in pitching face, and dotted line represents the antenna pattern of azimuth plane.From in figure, using the present embodiment
The antenna assembly of said structure the antenna pattern in pitching face half power lobe width up to 13.5o, minor level is less than-
17dB, the half power lobe width of the antenna pattern of azimuth plane is 20o, and minor level is less than -23dB.
The antenna pattern of center-fed antenna unit 112 obtained by being illustrated in figure 8 in the specific embodiment of the invention, wherein
Solid line represents the antenna pattern in pitching face, and dotted line represents the antenna pattern of azimuth plane.From in figure, using the present embodiment
The antenna of said structure the antenna pattern in pitching face half power lobe width up to 12.5o, minor level is less than-
19.7dB, the half power lobe width of the antenna pattern of azimuth plane is 19.7o, and minor level is less than -19.2dB.I.e. using this
Embodiment said antenna device, enables to antenna structure compact, and transmission wiring is simple, and device volume and cost are small, while energy
Enough ensure that antenna has narrow beam, high-gain and secondary lobe electricity small, meet the application demand of zone perimeters protection etc..
In the present embodiment, high frequency substrate is additionally provided with bottom plate 1, antenna element 11, feeding transmission unit 12 print
On high frequency substrate.
The above-mentioned antenna assembly for radar sensor of the present embodiment is especially suitable suitable for millimetre-wave radar sensor
In the millimeter wave height sensor of anticollision.
Above-mentioned simply presently preferred embodiments of the present invention, not makees any formal limitation to the present invention.Although of the invention
It is disclosed above with preferred embodiment, but it is not limited to the present invention.Therefore, it is every without departing from technical solution of the present invention
Content, according to the technology of the present invention essence to any simple modification, equivalent variation and modification made for any of the above embodiments, all should fall
In the range of technical solution of the present invention protection.
Claims (10)
1. a kind of antenna assembly for radar sensor, including printed circuit board (PCB), the bottom plate of the printed circuit board (PCB)（1）On
It is disposed with more than one group of antenna element（11）, antenna element described in every group（11）Including reception antenna, transmitting antenna, the print
The top plate of printed circuit board（2）On be disposed with radio circuit（21）, it is characterised in that：Antenna element described in every group（11）Difference cloth
It is placed in the bottom plate（1）Both sides, the bottom plate（1）On be additionally provided with feeding transmission unit（12）, the feeding transmission
Unit（12）By the antenna element（11）Distributing point in the bottom plate（1）On to the radio circuit（21）Region
Direction extends to the position of target distributing point, and the top plate is extended to by target distributing point via（2）Afterwards with the radio frequency electrical
Road（21）Connection.
2. the antenna assembly according to claim 1 for radar sensor, it is characterised in that：Antenna element described in every group
（11）Correspond to present antenna element by the end that end feedback antenna is constituted respectively（111）, the center-fed antenna unit that is made up of center-fed antenna
（112）, antenna element is presented at the end（111）Distributing point connect the feeding transmission unit（12）, the center-fed antenna unit
（112）Distributing point via extend to the top plate（2）Afterwards with the radio circuit（21）Connection.
3. the antenna assembly according to claim 2 for radar sensor, it is characterised in that：The feeding transmission unit
（12）Transmission terminal position for target distributing point via is extended into the top plate（2）When, it is at described penetrate
Frequency circuit（21）In the designated area at place.
4. the antenna assembly according to claim 3 for radar sensor, it is characterised in that：Present antenna element in the end
（111）Including multiple End-fed Array Antennas being connected in parallel, the center-fed antenna unit（112）Including in multiple be connected in parallel
Present array antenna.
5. the antenna assembly for radar sensor according to Claims 2 or 3 or 4, it is characterised in that：The middle feedback day
Line unit（112）With the radio circuit（21）It is arranged in the homonymy of the printed circuit board (PCB).
6. the antenna assembly according to claim 5 for radar sensor, it is characterised in that：The center-fed antenna unit
（112）The position at place is by the center-fed antenna unit（112）Distributing point via extend to the top plate（2）When, energy
Enough it is in the radio circuit（21）In the designated area at place.
7. the antenna assembly for radar sensor according to right wants 2 or 3 or 4, it is characterised in that：Present antenna in the end
Unit（111）The first main feed electric network including horizontal direction, multiple first point of feedback with identical structure and for vertical direction
Electric network, the left and right part of the first main feed electric network is relative to end-feed point symmetry, in first point of feeding network
The microstrip antenna element of upper part and the microstrip antenna element of lower part are symmetrical.
8. the antenna assembly according to claim 7 for radar sensor, it is characterised in that：The center-fed antenna unit
（112）The second main feed electric network including horizontal direction, multiple second point of transmission network with identical structure and for vertical direction
Network, the left-right parts of the second main feed electric network, top and the bottom are respectively relative to middle part feed point symmetry, second point of feedback
The microstrip antenna element of electric network middle and upper part point and the microstrip antenna element of lower part be symmetrical and opposite in phase, second point of feedback
Transmission line is additionally provided with the feed-in of electric network middle and upper part point, to keep the upper part and lower part of second point of feeding network
With mutually feed.
9. the antenna assembly for radar sensor according to any one in Claims 1 to 4, it is characterised in that：Institute
State feeding transmission unit（12）For feeding transmission line.
10. the antenna assembly for radar sensor according to any one in Claims 1 to 4, it is characterised in that：Institute
State bottom plate（1）On be additionally provided with high frequency substrate, the antenna element（11）, feeding transmission unit（12）It is printed on the high frequency
On substrate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710250046.2A CN106953157B (en) | 2017-04-17 | 2017-04-17 | Antenna device for radar sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710250046.2A CN106953157B (en) | 2017-04-17 | 2017-04-17 | Antenna device for radar sensor |
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| CN106953157A true CN106953157A (en) | 2017-07-14 |
| CN106953157B CN106953157B (en) | 2023-06-27 |
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| CN116053775A (en) * | 2023-01-28 | 2023-05-02 | 南京慧尔视智能科技有限公司 | Structure and design method of high-gain narrow-beam microstrip array antenna |
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