CN218602746U - Millimeter wave radar antenna array and millimeter wave radar - Google Patents
Millimeter wave radar antenna array and millimeter wave radar Download PDFInfo
- Publication number
- CN218602746U CN218602746U CN202222967267.0U CN202222967267U CN218602746U CN 218602746 U CN218602746 U CN 218602746U CN 202222967267 U CN202222967267 U CN 202222967267U CN 218602746 U CN218602746 U CN 218602746U
- Authority
- CN
- China
- Prior art keywords
- millimeter wave
- wave radar
- antenna array
- array
- receiving antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Radar Systems Or Details Thereof (AREA)
Abstract
The utility model provides a millimeter wave radar antenna array and millimeter wave radar, wherein, the antenna array includes: the receiving antenna array comprises first to eighth receiving antenna units, the first to sixth receiving antenna units are horizontally arranged at intervals by taking d as a distance, and the sixth to eighth receiving antenna units are vertically arranged at intervals by taking 6d as a distance; the transmitting antenna array comprises first to sixth transmitting antenna units, the first to fifth transmitting antenna units are horizontally arranged at intervals by taking 6d as an interval, and the sixth transmitting antenna unit and the first transmitting antenna unit are vertically arranged at intervals by taking 18d as an interval; the electromagnetic band gap structures are arranged on two sides in the horizontal direction; where d is the length of the half wavelength of free space. The utility model discloses make limited array unit number can acquire as far as possible array aperture in the space as little as possible, possess higher angular resolution, restrained the influence of mutual coupling between the antenna unit simultaneously, increased the angle of pitch information of target and effectively improved DOA's angle measurement precision.
Description
Technical Field
The utility model relates to a millimeter wave radar field, concretely relates to millimeter wave radar antenna array and millimeter wave radar.
Background
The roadside sensing technology can effectively expand the sensing range of an automatic driving Vehicle and a driver, and realizes the integrated operation monitoring of human-Vehicle-road-cloud through a Vehicle-road cooperation technology (V2X), road traffic abnormity is discovered at the first time, intelligent applications such as Vehicle-road cooperation, vehicle-cloud cooperation and regional-road-cloud cooperation are realized, the intelligent travel requirements of the automatic driving Vehicle and the social Vehicle are met, meanwhile, a monitoring mechanism can be more efficient and flexible, a monitoring environment with higher response speed and more flexibility is established, sensors such as a camera, a millimeter wave radar and a laser radar are utilized, and roadside edge calculation is combined, so that the final purpose is To realize the instantaneous intelligent sensing of traffic participants, road conditions and the like in the road section.
For roadside radars, complex traffic and road environments put a very high requirement on the accuracy of radar work, and especially the angular resolution of the radar often determines whether the millimeter wave radar can play a corresponding role in an actual scene. The millimeter wave radar working in the 76-81 GHz frequency band has ideal distance and speed measurement performance, but the angle measurement performance is relatively limited. An effective means for improving the angular resolution Of the array is to directly enlarge the aperture Of the array by increasing the number Of antennas, but in general, the physical position for the antennas to be arranged is very limited, and a large array capable Of identifying a target in an ultra-precision manner cannot be realized.
Because of its simple design and convenient processing operation, the uniform linear array has been widely used in various antenna arrays for many years, but it also has many defects: in order to avoid spatial blurring, the array element unit spacing is usually required to be set to be smaller than half wavelength, and the resolution and precision of a plurality of DOA estimation algorithms based on uniform linear arrays are affected by the number of array elements, the array element spacing, the signal-to-noise ratio, the number of snapshots and other factors. In addition, in the background of applying high carrier frequency radar, the uniform linear array with half-wavelength array often has the phenomenon of mutual coupling among elements because the array element spacing is too small, which has very adverse effect on the result of DOA estimation.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned problem and go on, aim at provides a millimeter wave radar antenna array and millimeter wave radar.
The utility model provides a millimeter wave radar antenna array, including receiving antenna array, transmitting antenna array and electromagnetic band gap structure, have such characteristic: the receiving antenna array comprises first to eighth receiving antenna units, the first to sixth receiving antenna units are arranged at intervals in the horizontal direction, the horizontal distance is d, the sixth to eighth receiving antenna units are arranged at intervals in the vertical direction, and the vertical distance is 6d; the transmitting antenna array comprises first to sixth transmitting antenna units, the first to fifth transmitting antenna units are arranged at intervals in the horizontal direction, the horizontal distance is 6d, the sixth transmitting antenna unit and the first transmitting antenna unit are arranged at intervals in the vertical direction, and the vertical distance is 18d; the electromagnetic band gap structures are arranged on two sides of the receiving antenna array and the transmitting antenna array in the horizontal direction; where d is the length of the half wavelength of free space.
The utility model provides an among the millimeter wave radar antenna array, can also have such characteristic: each receiving antenna unit comprises five rectangular microstrip patches which are distributed in the vertical direction and connected in series, and each transmitting antenna unit comprises ten rectangular microstrip patches which are distributed in the vertical direction and connected in series.
The utility model provides an among the millimeter wave radar antenna array, can also have such characteristic: the first to sixth receiving antenna units are arranged at intervals from left to right in the horizontal direction, and the sixth to eighth receiving antenna units are arranged at intervals from top to bottom in the vertical direction; the first to fifth transmitting antenna units are arranged at intervals from left to right in the horizontal direction and are located on the lower side of the receiving antenna array in the vertical direction, the sixth transmitting antenna unit and the first transmitting antenna unit are arranged at intervals from top to bottom in the vertical direction, and the sixth transmitting antenna unit is located on the left side of the receiving antenna array in the horizontal direction.
The utility model provides an among the millimeter wave radar antenna array, can also have such characteristic: three lines of electromagnetic bandgap structures are arranged on each side of the horizontal direction of the whole of the receiving antenna array and the transmitting antenna array, and the electromagnetic bandgap structures are circular electromagnetic bandgap structures.
The utility model provides an among the millimeter wave radar antenna array, can also have such characteristic: the millimeter wave radar antenna array can virtually form a half-wavelength equal-spacing linear array with the maximum number of 30 units in the horizontal direction through MIMO, and can virtually form an angle measuring array with the maximum number of 6 units in the pitch direction through MIMO.
The utility model also provides a millimeter wave radar has such characteristic: including the millimeter wave radar antenna array described above.
The utility model provides an in the millimeter wave radar, can also have such characteristic: the millimeter wave radar is a road side millimeter wave radar with the working frequency of 76-81 GHz.
Action and effect of the utility model
According to the millimeter wave radar antenna array and the millimeter wave radar related to the utility model, because the quantity and the interval of each antenna unit of the receiving antenna array and the transmitting antenna array are optimized, the utility model can make the limited array unit number obtain the array aperture as large as possible in the space as small as possible, and has higher angular resolution; because the electromagnetic band gap structures are uniformly distributed on the two sides of the receiving antenna array and the transmitting antenna array in the whole horizontal direction, the utility model can effectively inhibit electromagnetic interference coupling and realize large-angle field angle detection; because millimeter wave radar antenna array can form 30 units of half-wavelength equidistant linear arrays in the horizontal direction through MIMO virtualization, and the receiving antenna unit of the actual horizontal direction only has 6 units, therefore, the utility model discloses increased horizontal DOA's resolution ratio and precision, can effectively avoid the space fuzzy; because millimeter wave radar antenna array is at the virtual 6 unit angular arrays that form of every single move direction accessible MIMO, so, the utility model discloses pitch angle resolution has effectively been improved.
Drawings
Fig. 1 is a schematic plan view of an array of millimeter wave radar antennas according to an embodiment of the present invention;
fig. 2 is a schematic position diagram of the receiving antenna unit and the transmitting antenna unit of the millimeter wave radar antenna array according to the embodiment of the present invention;
fig. 3 is a schematic diagram of a MIMO equivalent virtual array in an embodiment of the present invention.
Description of reference numerals:
10 receiving an antenna array; 11 a receiving antenna unit; 20 a transmit antenna array; 21 a transmitting antenna unit; 30 electromagnetic bandgap structure.
Detailed Description
In order to make the technical means, creation features, achievement purposes and effects of the present invention easy to understand, the following embodiments are specifically illustrated in conjunction with the accompanying drawings.
Examples
The embodiment provides a millimeter wave radar antenna, which comprises a millimeter wave radar antenna array with novel design. Wherein the millimeter wave radar is a road side millimeter wave radar with the working frequency of 76-81 GHz.
Fig. 1 is a schematic plan view of a millimeter wave radar antenna array.
As shown in fig. 1, the millimeter wave radar antenna array includes a receiving antenna array 10, a transmitting antenna array 20, and an electromagnetic bandgap structure 30. The length of the half-wavelength of the free space is taken as d, and each part is specifically explained below.
Fig. 2 is a schematic position diagram of the receiving antenna elements and the transmitting antenna elements of the millimeter wave radar antenna array.
As shown in fig. 1 and 2, the receiving antenna array 10 includes eight receiving antenna units 11, which are respectively the first receiving antenna unit RX1 to the eighth receiving antenna unit RX8, each receiving antenna unit is a serial antenna and includes five rectangular microstrip patches distributed in the vertical direction and connected in series. The first receiving antenna unit RX1 to the sixth receiving antenna unit RX6 are arranged at intervals from left to right in the horizontal direction at a horizontal interval of d, and the sixth receiving antenna unit RX6 to the eighth receiving antenna unit RX8 are arranged at intervals from top to bottom in the vertical direction at a vertical interval of 6d.
The transmit antenna array 20 includes six transmit antenna units 21, which are respectively a first transmit antenna unit TX1 to a sixth transmit antenna unit TX6, each transmit antenna unit is a serial antenna including ten rectangular microstrip patches distributed in the vertical direction and connected in series. The first transmitting antenna unit TX1 to the fifth transmitting antenna unit TX5 are arranged at intervals from left to right in the horizontal direction, the horizontal interval is 6d, the sixth transmitting antenna unit TX6 and the first transmitting antenna unit TX1 are arranged at intervals from top to bottom in the vertical direction, the vertical interval is 18d, the first transmitting antenna unit TX1 to the fifth transmitting antenna unit TX5 are located on the lower side of the receiving antenna array 10 in the vertical direction, and the sixth transmitting antenna unit TX6 is located on the left side of the receiving antenna array 10 in the horizontal direction.
According to the content, the radiation array surface of the millimeter wave radar antenna array adopts the rectangular micro-strip patches which are connected in series to form the micro-strip array antenna unit, the width of the rectangular micro-strip patches is controlled to carry out amplitude weighting, and the horizontal spacing and the vertical spacing of two adjacent antenna units are adjusted to enable the phases to be in the same direction, so that the low-side lobe array is formed.
The left and right sides of the receiving antenna array 10 and the transmitting antenna array 20 in the overall horizontal direction are uniformly provided with a plurality of rows of electromagnetic band gap structures 30, which can effectively inhibit electromagnetic interference coupling, so that the antenna array can realize wide-angle Field of View (FOV) detection. In the present embodiment, three columns of electromagnetic bandgap structures 30 are arranged on each side of the overall horizontal direction of the receive antenna array 10 and the transmit antenna array 20, and the electromagnetic bandgap structures 30 are circular electromagnetic bandgap structures.
Fig. 3 is a schematic diagram of a MIMO equivalent virtual array.
As shown in fig. 3, the millimeter wave radar antenna array can be virtualized as a 48-unit MIMO equivalent virtual array, and has good horizontal and pitch angle measurement capabilities.
Specifically, the antenna array can virtually form a half-wavelength equal-spacing linear array with the maximum number of 30 units in the horizontal direction through MIMO, so that space blurring can be effectively avoided, and meanwhile, the resolution and precision of horizontal DOA are increased. The antenna array can form an angle measuring array with the maximum number of 6 units in the pitching direction through MIMO virtual, and the pitch angle resolution can be effectively improved.
According to angular resolution theta res The calculation formula of (2): theta res And = λ/(N × L × cos (θ)), where N is the number of antenna elements, L is the distance between the antenna elements, and θ is the angle between the target and the antenna array, and the angular resolution is calculated with the target located directly in front of the antenna array, and θ is 0 °. The antenna array is equivalent to a receiving array with 30 units and a distance d in the horizontal direction, and the angular resolution theta in the horizontal direction can be obtained by substituting a calculation formula res 1/15 (radians), converted to an angle of 3.8 °; the antenna array is equivalent to a receiving array with 6 units and a distance of 6d in the pitching direction, and the angular resolution theta can be obtained by substituting the receiving array into a calculation formula res =1/18 (radian), conversion angle is 3.2 °. It should be noted that, an omnidirectional antenna is adopted in the calculation, and the beam is narrower after the actual antenna is weighted, so that the obtained actual angle resolution is higher than the calculated theoretical value, and therefore, the MIMO equivalent virtual array of the millimeter wave radar antenna array can effectively improve the horizontal and pitch angle resolutions.
The millimeter wave radar antenna array further comprises a dielectric substrate, wherein the dielectric substrate can be made of Rogers 3003 plates with the dielectric constant of 3, and the transmitting antenna array 20, the receiving antenna array 10 and the electromagnetic band gap structure 30 are arranged on the dielectric substrate.
The embodiment also provides a method for constructing the millimeter wave radar antenna array, which includes:
determining the wavelength of a working signal of the antenna array according to the roadside millimeter wave radar with the working frequency of 76-81 GHz, and determining the geometric size of a radiation array surface of the antenna array according to the requirements of a field angle and gain;
designing the width and length of the rectangular microstrip patch of the receiving antenna unit and the rectangular microstrip patch of the transmitting antenna unit according to the array element number and the requirement of taper distribution of the radiation excitation power of each array element;
the first to sixth receiving antenna units of the eight receiving antenna units 10 are horizontally spaced by taking d as a spacing, the sixth to eighth receiving antenna units are vertically spaced by taking 6d as a spacing, the first to fifth transmitting antenna units of the six transmitting antenna units 20 are horizontally spaced by taking 6d as a spacing, the sixth transmitting antenna unit and the first transmitting antenna unit are vertically spaced by taking 18d as a spacing, the electromagnetic band gap structures 30 are arranged on two sides of the receiving antenna array 10 and the transmitting antenna array 20 in the horizontal direction as a whole, and the sizes of the through holes and the circular patches thereof are adjusted to match the operating frequency of the millimeter wave radar.
Under the condition of meeting certain geometric dimension design, the millimeter wave radar antenna array can also be formed by cascading two radio frequency chips with 3 transmitting channels and 4 receiving channels.
It is obvious to those skilled in the art that the receiving antenna unit and the transmitting antenna unit may be implemented by waveguide antennas, horn antennas or slot antennas, instead of the microstrip antennas shown above.
Effects and effects of the embodiments
According to the millimeter wave radar and the millimeter wave radar antenna array related to the embodiment, because the number and the distance of each antenna unit of the receiving antenna array and the transmitting antenna array are optimized, the utility model can ensure that the limited number of the array units can obtain the array aperture as large as possible in the space as small as possible, and has higher angular resolution; because the electromagnetic band gap structures are uniformly distributed on the two sides of the receiving antenna array and the transmitting antenna array in the whole horizontal direction, the utility model can effectively inhibit electromagnetic interference coupling and realize large-angle field angle detection; because millimeter wave radar antenna array can form 30 units of half-wavelength equidistant linear arrays in the horizontal direction through MIMO virtualization, and the receiving antenna unit of the actual horizontal direction only has 6 units, therefore, the utility model discloses increased horizontal DOA's resolution ratio and precision, can effectively avoid the space fuzzy; because millimeter wave radar antenna array is at the virtual 6 unit angular arrays that form of every single move direction accessible MIMO, so, the utility model discloses pitch angle resolution has effectively been improved.
The above embodiments are preferred examples of the present invention, and are not intended to limit the scope of the present invention.
Claims (7)
1. A millimeter wave radar antenna array comprises a receiving antenna array, a transmitting antenna array and an electromagnetic band gap structure, and is characterized in that:
the receiving antenna array comprises first to eighth receiving antenna units, the first to sixth receiving antenna units are arranged at intervals in the horizontal direction, the horizontal distance is d, the sixth to eighth receiving antenna units are arranged at intervals in the vertical direction, and the vertical distance is 6d;
the transmitting antenna array comprises first to sixth transmitting antenna units, the first to fifth transmitting antenna units are arranged at intervals in the horizontal direction, the horizontal distance is 6d, and the sixth transmitting antenna unit and the first transmitting antenna unit are arranged at intervals in the vertical direction, and the vertical distance is 18d;
the electromagnetic band gap structures are arranged on two sides of the whole of the receiving antenna array and the transmitting antenna array in the horizontal direction;
where d is the length of the half wavelength of free space.
2. The millimeter wave radar antenna array of claim 1, wherein:
wherein each receiving antenna unit comprises five rectangular microstrip patches which are distributed in the vertical direction and connected in series,
each transmitting antenna unit comprises ten rectangular microstrip patches distributed in the vertical direction and connected in series.
3. The millimeter wave radar antenna array of claim 1, wherein:
the first receiving antenna units, the second receiving antenna units, the third receiving antenna units and the fourth receiving antenna units are arranged at intervals from left to right in the horizontal direction, and the sixth receiving antenna units, the fourth receiving antenna units and the eighth receiving antenna units are arranged at intervals from top to bottom in the vertical direction;
the first to fifth transmitting antenna units are arranged at intervals from left to right in the horizontal direction and are positioned on the lower side of the receiving antenna array in the vertical direction, the sixth transmitting antenna unit and the first transmitting antenna unit are arranged at intervals from top to bottom in the vertical direction, and the sixth transmitting antenna unit is positioned on the left side of the receiving antenna array in the horizontal direction.
4. The millimeter wave radar antenna array of claim 1, wherein:
wherein three columns of the electromagnetic bandgap structures are arranged on each side of the horizontal direction of the whole of the receiving antenna array and the transmitting antenna array, and the electromagnetic bandgap structures are circular electromagnetic bandgap structures.
5. The millimeter wave radar antenna array of claim 1, wherein:
the millimeter wave radar antenna array can virtually form a half-wavelength equal-spacing linear array with the maximum number of 30 units in the horizontal direction through MIMO, and can virtually form an angle measuring array with the maximum number of 6 units in the pitching direction through MIMO.
6. A millimeter wave radar comprising the millimeter wave radar antenna array of any of claims 1 to 5.
7. The millimeter wave radar of claim 6, wherein:
the millimeter wave radar is a road side millimeter wave radar with the working frequency of 76-81 GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222967267.0U CN218602746U (en) | 2022-11-07 | 2022-11-07 | Millimeter wave radar antenna array and millimeter wave radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222967267.0U CN218602746U (en) | 2022-11-07 | 2022-11-07 | Millimeter wave radar antenna array and millimeter wave radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218602746U true CN218602746U (en) | 2023-03-10 |
Family
ID=85406070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222967267.0U Active CN218602746U (en) | 2022-11-07 | 2022-11-07 | Millimeter wave radar antenna array and millimeter wave radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218602746U (en) |
-
2022
- 2022-11-07 CN CN202222967267.0U patent/CN218602746U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20220146623A1 (en) | Radar System and Vehicle | |
| EP2113788A2 (en) | Mobile radar and planar antenna | |
| CN108469607B (en) | Unmanned aerial vehicle detection radar angle measurement method based on frequency scanning antenna | |
| CN112136060B (en) | MIMO radar sensor for motor vehicles | |
| CN110224224B (en) | Wide-beam 77GHz millimeter wave vehicle-mounted radar antenna | |
| CN106953157B (en) | Antenna device for radar sensor | |
| CN112103645A (en) | High-gain automobile millimeter wave radar array antenna | |
| Zhao et al. | Hybrid antenna arrays with high angular resolution for 77 GHz automotive radars | |
| CN207852911U (en) | A kind of stripline antenna battle array based on continuous wave phased array | |
| CN212366213U (en) | High-gain millimeter wave high-sensitivity array antenna | |
| CN218602746U (en) | Millimeter wave radar antenna array and millimeter wave radar | |
| CN104931936A (en) | A double-wave-beam radar sensor | |
| Ram et al. | 77GHz corporate feed series microstrip antenna array for the applications of automotive radar | |
| CN112103666A (en) | Automobile anti-collision radar array antenna | |
| CN110429376B (en) | Antenna unit, antenna array and antenna | |
| CN112103667A (en) | Array antenna for automobile radar sensor | |
| CN209329142U (en) | A kind of 77GHz vehicle anti-collision radar antenna | |
| CN217561727U (en) | Radar and unmanned aerial vehicle | |
| CN115693151A (en) | Millimeter wave radar antenna array, construction method and millimeter wave radar | |
| CN214280218U (en) | Receiving and transmitting antenna array based on MIMO system radar | |
| CN212934860U (en) | Array antenna for millimeter wave radar sensor | |
| CN211786077U (en) | Radar antenna, radar, unmanned aerial vehicle and equipment | |
| CN214954056U (en) | Radar antenna, radar, unmanned aerial vehicle and equipment | |
| CN104701633A (en) | Millimeter-wave lens antenna | |
| CN107134644A (en) | The high-gain ME poles sub-antenna of double-deck micro-strip ridge gap waveguide feed |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |