CN110112567A - A method of improving vehicle-mounted millimeter wave radar antenna receive-transmit isolation - Google Patents
A method of improving vehicle-mounted millimeter wave radar antenna receive-transmit isolation Download PDFInfo
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- CN110112567A CN110112567A CN201910296535.0A CN201910296535A CN110112567A CN 110112567 A CN110112567 A CN 110112567A CN 201910296535 A CN201910296535 A CN 201910296535A CN 110112567 A CN110112567 A CN 110112567A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
- H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
- H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
-
- 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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- 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
-
- 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
- H01Q21/08—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a rectilinear path
- H01Q21/12—Parallel arrangements of substantially straight elongated conductive units
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
A method of vehicle-mounted millimeter wave radar antenna receive-transmit isolation being improved, this method by way of the radiation level in airspace, effectively improves the isolation of dual-mode antenna near positive and negative 90 ° with transmission antenna group battle array directional diagram controlling and receiving.By using multiple row reception and transmitting antenna, while aerial radiation patch is controlled in the width in transmitting-receiving group battle array direction, effectively control the coupling on the radiation path of dual-mode antenna space.When transmitting-receiving is all made of columnar version, under the conditions of same spacing etc., isolation between transmitting and receiving antenna is about 35dB, and transmitting is emitted using biserial, and adjusts transmitting antenna patch in group width in battle array direction, so that isolation between transmitting and receiving antenna is increased to 55dB or so.
Description
Technical field
The invention belongs to radar and technical field of automotive electronics, be related to a kind of raising vehicle-mounted millimeter wave radar antenna transmitting-receiving every
Method from degree.
Background technique
Automotive safety intelligent driving be the research of current vehicle electric field hot spot, core apparatus is exactly radar sensing
Device, and millimetre-wave radar among these has apparent advantage compared with the sensor of other forms such as ultrasonic wave, infrared, laser etc.,
Include: to be easily achieved higher distance resolution, blind range zone is not present, transmission power is low, is protected from weather influences.Thus,
Millimetre-wave radar also becomes the main sensors form of automobile collision preventing.
Currently, the working frequency range of vehicle-mounted millimeter wave radar is assigned as 24GHz and 77GHz.The multifunction chip of existing standard
Radar radio frequency, numerical portion function can be achieved, radar antenna mostly uses microstrip array form, according to different angle measurement modes, essence
Degree and ranging require to convert the combining form of its array.
Current millimetre-wave radar waveform mostly uses CW with frequency modulation (FMCW) form, broadband when this debud mode has big
The advantages such as width product, nothing are fuzzy, operating distance is remote, but also there is certain limitation, this debud mode is different from pulse regime
Radar, Receiver And Transmitter work at the same time, so the isolating problem (co-channel interference) between transmitting-receiving is to influence radar
The key factor of ability.In transceiver insulation problem, the isolation of radio frequency chip be it is certain, the transceiver insulation of aerial array is thunder
The key designed up to isolation.
Mainly have for the mode for improving microstrip antenna array isolation in the prior art:
1, increase dual-mode antenna distance.This mode is most direct, and is easiest to the mode realized, is passed according to electromagnetic wave space
Defeated formula, when distance increases a wavelength (electromagnetic wavelength under working frequency), loss increases about 6dB, passes through this continuous increasing
The mode of dual-mode antenna spacing is added to realize certain receive-transmit isolation index request.But the cost of this mode is radar antenna ruler
Very little unlimited increase, it is obvious that this may be implemented in the requirement installed additional on family-sized car for the compact of vehicle-mounted millimeter wave radar
It is not inconsistent.Trailer-mounted radar is to require to realize set insulated degree requirement under existing certain volume size.
2, increase periodic structures such as electro-magnetic bandgap (EBG), between dual-mode antenna to block the surface current between dual-mode antenna.
Such mode has several use conditions, and first (general minimum 3 after the periodic structure of electro-magnetic bandgap reaches certain amount of cycles
To 5 periods) there could be more apparent raising isolation, this just needs dual-mode antenna to come with certain space
It arranges enough periodic structures.Second, this structure plays inhibiting effect only for the surface wave between dual-mode antenna, and right
The electromagnetic wave that space of lines is radiate in day does not almost have any inhibiting effect.Third, electromagnetic bandgap structure are a kind of resonance
Structure, be for narrowband electricity frequency special effect it is obvious, it is bad for broadband effects.
3, increasing isolation baffle plate between dual-mode antenna, such mode can block the surface wave between dual-mode antenna to couple simultaneously,
It can inhibit the Space Coupling between dual-mode antenna simultaneously, also avoid the large scale requirement for increasing dual-mode antenna spacing simply.But
The validity of isolation board protrudes that antenna surface is highly relevant with it, although this mode saves the lateral dimension of radar antenna,
But the longitudinal size of radar antenna can be greatly increased, it is unfavorable for the integrated requirement of low section of millimetre-wave radar.Another isolation board is answered
Using metal structure, uncertain influence can be caused on the pattern shapes of dual-mode antenna.
Summary of the invention
Present invention aims under vehicle-mounted millimeter wave Radar Design sized boundary, realize that radar antenna receives and dispatches high-isolation
Index, and a kind of method for improving vehicle-mounted millimeter wave radar antenna receive-transmit isolation is provided.
The technical solution adopted by the present invention is that:
The one transmitter and four receivers series feed micro-strip array antenna that the present invention uses, including dielectric-slab, micro-strip array antenna, vertical interconnection structure
And antenna plate edge floor 12；Dielectric-slab includes that two layers of thickness is 3, one layers of Rogers4350B dielectric layer of 0.254mm
FR4 dielectric layer 4, two thickness degree with a thickness of 0.485mm are the antenna copper clad layers 1 of 0.035mm and two thickness degree are
The bottom plate copper clad layers 2 of 0.017mm；Two layers of bottom plate copper clad layers 2 are separately positioned on 4 upper and lower surface of FR4 dielectric layer, two layer medium layer 3
It is interposed in the outer surface of two layers of bottom plate copper clad layers 2 respectively, the outer surface of two layer medium layer 3 covers antenna copper clad layers 1, two layers of day
It is connect with radio frequency chip for 1 innings of line copper clad layers；
Micro-strip array antenna uses 10 radiation patch apex drives, reduces aerial radiation side by the way of Taylor's amplitude weighting
It to the minor lobe of figure, is designed according to minor lobe 25dB, amplitude distribution is realized by width non-radiant edged in radiation patch；
It is reduced on dual-mode antenna group battle array direction by optimization design, between transmitting and reception diagram near positive and negative 90 °
Radiation coupling between the radiation level in airspace, i.e. reduction receiving antenna 9 and 8 radiation path of transmitting antenna, to improve receiving antenna 9
With 8 isolations of transmitting antenna；Specifically single-row antenna can be controlled flat with wx by adjusting aerial radiation patch width wx is increased
The radiation level in the positive and negative neighbouring airspace of 90 ° of degree of directional diagram on row section；Lambda_g is not to be exceeded in wx, and lambda_g is in medium
The waveguide wavelength of Antenna Operation, the relationship with air medium wavelength is lambda/sqrt (er), and wherein lambda is air medium wave
Long, er is the relative dielectric constant of medium；Er is that the relative dielectric constant of medium includes the dielectric constant of Rogers4350B medium
With the dielectric constant of FR4 medium；The dielectric constant of Rogers4350B medium is 3.43 ~ 3.53；The dielectric constant of FR4 medium is
4.2~4.7。
Transmitting antenna 8 and receiving antenna 9 are further decreased by the way of multiple row transmitting and/or receiving antenna simultaneously, or
The radiation level in the airspace near receiving antenna 9 and positive and negative 90 ° of 8 arragement direction section of transmitting antenna of receiving antenna 9；Meanwhile with
The increase of transmitting antenna 8,9 columns of receiving antenna, antenna pattern beamwidth accordingly narrow in proportion, be considered as radar and answer
With the specific requirement of the radar illumination field range in demand.
The feed of the single-row apex drive micro-strip paster antenna should ensure that the phase difference for reaching adjacent two unit feeder is
180°。
The feed of the single-row apex drive micro-strip paster antenna should ensure that the phase difference for reaching adjacent two unit feeder is
180°。
Compared with prior art, the present invention having the following advantages and beneficial effects:
It is of the present invention to exist by adjusting radiation patch width or using the reduction antenna of multiple row transmitting and/or receiving antenna
The mode of positive and negative 90 ° of attachment pattern levels on transmitting-receiving group battle array direction, effectively between increase vehicle-mounted millimeter wave radar transmit-receive antenna
Isolation.Radar antenna overall dimensions requirement is substantially reduced relative to by the way of increasing dual-mode antenna spacing；Relatively
It is also avoided one required for periodic structure works in by the way of surface wave between periodic structure (EBG etc.) inhibition dual-mode antenna
Determine minimum number, also the requirement of certain size；Relative to the mode for installing isolation board between dual-mode antenna additional, increase is avoided
The drawbacks of radar antenna longitudinal size.
Detailed description of the invention
Fig. 1 is medium diagrammatic cross-section of the invention.
Fig. 2 is sending antenna structure figure of the invention.
Fig. 3 is overall structure diagram of the invention.
Fig. 4 is directional diagram of the receiving antenna of the present invention in azimuth plane and pitching face that frequency is 24.2GHz.
Fig. 5 is directional diagram of the transmitting antenna of the present invention in azimuth plane and pitching face that frequency is 24.2GHz.
Fig. 6 is that isolation is write music line chart between dual-mode antenna of the invention.
Specific embodiment
As shown in figure 3, radar antenna battle array overall dimensions Dx*Dy:73mm*73mm, independent comprising 1 road transmitting antenna, 8,4 road
Receiving antenna 9.Entire antenna array is attached in antenna copper clad layers 1, as shown in Figure 1；
As shown in Fig. 2, the micro-strip array antenna 8 is passed through using two each 10 yuan of 5 forms of series feed micro-strip paster antenna of column
It adjusts the patch size perpendicular to feed line vertical direction and controls the feed amplitude of each antenna to form Taylor's amplitude weighting,
To obtain the minor-lobe radiation directional diagram of 25dB.
Between the 5th unit and the 6th unit, antenna feed point 10 should meet 10 yuan of antenna feed points 10 of each column
Up to the 5th unit, the 6th unit phase meet working frequency phase be 180 °, structure is shown in the antenna feed structure 6 in Fig. 2.
Two column transmitting antennas 8 synthesize a line feed, and feed point is located at center of antenna, by passing through two layers of Rogers4350B
The vertical vias of dielectric layer 3 and one layer of FR4 dielectric layer 4 is connected to the antenna back side, convenient for being connected with the radio frequency chip at its back side.
The via hole period increases 5 around the first earth shield column 7 in its period and the second earth shield column 11 to realize millimeter wave electricity
Magnetic wave interlayer vertical transfer, as shown in Figures 2 and 3.The the 5th and the 6th two patch is most wide in every array antenna, width be wx=
4.9mm, remaining patch press Taylor 25dB amplitude weighting, be sequentially reduced width, for transmitting two array antenna spacing be Wx=
5.98mm, dual-mode antenna spacing dd=24mm.
Antenna plate edge floor 12 in Fig. 3 is the grounded metal around antenna, for the ground connection of radar antenna plate, and
Placement of mechanical interface.
Fig. 4 gives azimuth plane and pitching face directional diagram of the receiving antenna at 24.2GHz frequency in this specific implementation,
Maximum gain reaches 15dBi, minor level 19dB, near positive and negative 90 degree of phi=0 degree section directional diagram, pattern levels
Reach -7 ~ -8dB.
Fig. 5 gives azimuth plane and pitching face directional diagram of the transmitting antenna 8 at 24.2GHz frequency in this specific implementation,
Its maximum gain reaches 17dBi, minor level 19dB, near positive and negative 90 degree of phi=0 degree section directional diagram, directional diagram electricity
It is flat to reach -15 ~ -20dB.So the isolation between dual-mode antenna can effectively improve, and reach 50dB shown in fig. 6 or so.And
If transmitting antenna also realizes that isolation is in 35dB or so using the columnar version as receiving antenna.
Claims (3)
1. a kind of method for improving vehicle-mounted millimeter wave radar antenna receive-transmit isolation, it is characterised in that: this method is: using a hair
Four receive series feed micro-strip array antenna, including dielectric-slab, micro-strip array antenna, vertical interconnection structure and antenna plate edge floor
(12)；Dielectric-slab includes Rogers4350B dielectric layer (3), a layer thickness 0.485mm that two layers of thickness is 0.254mm
FR4 dielectric layer (4), two thickness degree be 0.035mm antenna copper clad layers (1) and two thickness degree be 0.017mm bottom plate
Copper clad layers (2)；Two layers of bottom plate copper clad layers (2) are separately positioned on FR4 dielectric layer (4) upper and lower surface, and two layer medium layer (3) presss from both sides respectively
It sets in the outer surface of two layers of bottom plate copper clad layers (2), the outer surface of two layer medium layer (3) covers antenna copper clad layers (1), two layers of day
Line copper clad layers (1) are connect with radio frequency chip；
Micro-strip array antenna uses 10 radiation patch apex drives, reduces aerial radiation side by the way of Taylor's amplitude weighting
It to the minor lobe of figure, is designed according to minor lobe 25dB, amplitude distribution is realized by width non-radiant edged in radiation patch；
It is reduced on dual-mode antenna group battle array direction by optimization design, between transmitting and reception diagram near positive and negative 90 °
The radiation level in airspace, i.e. radiation coupling between reduction receiving antenna (9) and transmitting antenna (8) radiation path, are received with improving
Isolation between antenna (9) and transmitting antenna (8)；Specifically single-row antenna can be controlled by adjusting aerial radiation patch width wx is increased
With directional diagram on wx parallel cut surface it is positive and negative 90 ° degree near airspace radiation level；Lambda_g, lambda_g is not to be exceeded in wx
It is the waveguide wavelength of Antenna Operation in medium, the relationship with air medium wavelength is lambda/sqrt (er), and wherein lambda is
Air medium wavelength, er are the relative dielectric constants of medium；Er is that the relative dielectric constant of medium includes Rogers4350B medium
The dielectric constant of dielectric constant and FR4 medium；The dielectric constant of Rogers4350B medium is 3.43 ~ 3.53；Jie of FR4 medium
Electric constant is 4.2 ~ 4.7；
Transmitting antenna (8) and receiving antenna (9) are further decreased by the way of multiple row transmitting and/or receiving antenna simultaneously or are connect
The radiation level in receipts antenna (9) airspace near receiving antenna (9) and positive and negative 90 ° of transmitting antenna (8) arragement direction section；Together
When, as (8, the increase of receiving antenna (9) columns, antenna pattern beamwidth accordingly narrow in proportion, take an examination transmitting antenna
Consider the specific requirement of the radar illumination field range in radar application demand；
The feed of the single-row apex drive micro-strip paster antenna should ensure that the phase difference for reaching adjacent two unit feeder is 180 °；
Antenna plate edge floor (12) is the grounded metal around antenna, ground connection and placement of mechanical interface for radar antenna plate.
2. a kind of method for improving vehicle-mounted millimeter wave radar antenna receive-transmit isolation according to claim 1, feature exist
In: the micro-strip array antenna (8) is using two each 10 yuan series feed micro-strip paster antenna (5) forms of column, by adjusting hanging down
The feed amplitude of each antenna is controlled in the patch size of feed line vertical direction directly to form Taylor's amplitude weighting, thus
To the minor-lobe radiation directional diagram of 25dB.
3. a kind of method for improving vehicle-mounted millimeter wave radar antenna receive-transmit isolation according to claim 2, feature exist
In: for 10 yuan of antenna feed points 10 of each column between the 5th unit and the 6th unit, antenna feed point 10 should meet arrival the 5th
A unit, the 6th unit phase meet working frequency phase be 180 °；Two column transmitting antennas (8) synthesize a line feed, feedback
Point is located at center of antenna, and the vertical vias by passing through two layers of Rogers4350B dielectric layer (3) and one layer of FR4 dielectric layer (4) connects
It is connected to the antenna back side, convenient for being connected with the radio frequency chip at its back side；The via hole period increases 5 and connects around the first of its period
Ground shields column (7) and the second earth shield column (11) to realize millimeter wave electromagnetic wave in the vertical transfer of interlayer；In every array antenna
5th and the 6th two patch is most wide, and width is wx=4.9mm, remaining patch presses Taylor 25dB amplitude weighting, is sequentially reduced width,
The two array antenna spacing for transmitting are Wx=5.98mm, dual-mode antenna spacing dd=24mm.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110581368A (en) * | 2019-09-18 | 2019-12-17 | 湖南大学 | Hydrological monitoring radar flat microstrip array antenna and design method thereof |
| CN110635235A (en) * | 2019-09-30 | 2019-12-31 | 南京微通电子技术有限公司 | Millimeter wave MIMO radar antenna and control method thereof |
| CN111276813A (en) * | 2019-12-27 | 2020-06-12 | 北京海兰信数据科技股份有限公司 | Radar antenna |
| CN111856446A (en) * | 2020-05-22 | 2020-10-30 | 青岛若愚科技有限公司 | Network monitoring system based on millimeter wave radar and millimeter wave antenna array structure |
| CN112164889A (en) * | 2020-08-25 | 2021-01-01 | 南京理工大学 | Low coupling receiving and transmitting antenna based on coplanar compression type electromagnetic band gap structure |
| CN113015340A (en) * | 2021-03-08 | 2021-06-22 | 浙江万正电子科技有限公司 | Drilling method of automobile millimeter wave radar circuit board and automobile millimeter wave radar circuit board |
| EP3846285A1 (en) * | 2020-01-06 | 2021-07-07 | Arcadyan Technology Corporation | Antenna for improving influence of surface waves and increasing beamwidth |
| CN113169459A (en) * | 2020-07-31 | 2021-07-23 | 深圳市大疆创新科技有限公司 | Antenna array, radar and movable platform |
| CN113471706A (en) * | 2021-06-30 | 2021-10-01 | 杭州电子科技大学 | Low sidelobe antenna array with parasitic radiation suppression function |
| CN113725600A (en) * | 2021-09-06 | 2021-11-30 | 华中科技大学温州先进制造技术研究院 | MIMO array antenna for millimeter wave automobile radar |
| CN113725601A (en) * | 2021-09-06 | 2021-11-30 | 华中科技大学温州先进制造技术研究院 | Multi-view-field array antenna for millimeter wave automobile radar |
| CN115275561A (en) * | 2022-08-19 | 2022-11-01 | 昆明理工大学 | High-gain broadband planar antenna and design method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110581368A (en) * | 2019-09-18 | 2019-12-17 | 湖南大学 | Hydrological monitoring radar flat microstrip array antenna and design method thereof |
| CN110635235A (en) * | 2019-09-30 | 2019-12-31 | 南京微通电子技术有限公司 | Millimeter wave MIMO radar antenna and control method thereof |
| CN111276813A (en) * | 2019-12-27 | 2020-06-12 | 北京海兰信数据科技股份有限公司 | Radar antenna |
| EP3846285A1 (en) * | 2020-01-06 | 2021-07-07 | Arcadyan Technology Corporation | Antenna for improving influence of surface waves and increasing beamwidth |
| CN111856446A (en) * | 2020-05-22 | 2020-10-30 | 青岛若愚科技有限公司 | Network monitoring system based on millimeter wave radar and millimeter wave antenna array structure |
| CN113169459A (en) * | 2020-07-31 | 2021-07-23 | 深圳市大疆创新科技有限公司 | Antenna array, radar and movable platform |
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| CN112164889A (en) * | 2020-08-25 | 2021-01-01 | 南京理工大学 | Low coupling receiving and transmitting antenna based on coplanar compression type electromagnetic band gap structure |
| CN113015340A (en) * | 2021-03-08 | 2021-06-22 | 浙江万正电子科技有限公司 | Drilling method of automobile millimeter wave radar circuit board and automobile millimeter wave radar circuit board |
| CN113471706A (en) * | 2021-06-30 | 2021-10-01 | 杭州电子科技大学 | Low sidelobe antenna array with parasitic radiation suppression function |
| CN113725600A (en) * | 2021-09-06 | 2021-11-30 | 华中科技大学温州先进制造技术研究院 | MIMO array antenna for millimeter wave automobile radar |
| CN113725601A (en) * | 2021-09-06 | 2021-11-30 | 华中科技大学温州先进制造技术研究院 | Multi-view-field array antenna for millimeter wave automobile radar |
| CN113725600B (en) * | 2021-09-06 | 2024-03-29 | 华中科技大学温州先进制造技术研究院 | MIMO array antenna for millimeter wave automobile radar |
| CN113725601B (en) * | 2021-09-06 | 2024-03-29 | 华中科技大学温州先进制造技术研究院 | Multi-view-field array antenna for millimeter wave automobile radar |
| CN115275561A (en) * | 2022-08-19 | 2022-11-01 | 昆明理工大学 | High-gain broadband planar antenna and design method thereof |
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| CN110112567B (en) | 2021-10-26 |
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