CN116111334A - Novel vehicle-mounted millimeter wave radar comb antenna - Google Patents
Novel vehicle-mounted millimeter wave radar comb antenna Download PDFInfo
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- CN116111334A CN116111334A CN202310186526.2A CN202310186526A CN116111334A CN 116111334 A CN116111334 A CN 116111334A CN 202310186526 A CN202310186526 A CN 202310186526A CN 116111334 A CN116111334 A CN 116111334A
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- antenna
- comb
- microstrip feeder
- millimeter wave
- wave radar
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
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- 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
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
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Abstract
The invention belongs to the technical field of microwaves, and discloses a novel vehicle-mounted millimeter wave radar comb antenna, which comprises a medium substrate, a comb array antenna and a metal floor, wherein the comb array antenna is fixedly arranged on the medium substrate, and the metal floor is fixedly connected to the bottom of the medium substrate; the comb-shaped array antenna comprises microstrip feeder lines, wherein antenna radiation units are fixedly arranged on the microstrip feeder lines at equal intervals, and a first impedance matching converter is fixedly arranged at a T-shaped connection part of the microstrip feeder lines and the antenna radiation units. According to the invention, the comb-shaped antenna is simple in design, the radiating units are identical in size and interval, the tolerance of the antenna is improved, the design of the antenna is simplified, and the antenna can be designed and processed easily; a 50 ohm microstrip feeder line is adopted, so that good broadband impedance matching can be realized; the antenna disclosed by the invention is less affected by machining tolerance, good and stable in antenna radiation consistency, and has engineering practicability such as miniaturization, low cost, easiness in machining and the like.
Description
Technical Field
The invention belongs to the technical field of microwaves, and particularly relates to a novel vehicle-mounted millimeter wave radar comb antenna.
Background
Because of the current trend, many microwave circuits are manufactured to use planar transmission lines, such as microstrip or stripline, so that the vehicle-mounted radar antenna is designed by adopting microstrip arrays and planar transmission feeder lines. The microstrip series feed array antenna has the characteristics of short feeder lines, compact array element arrangement, good space utilization, easy integration, no need of separately designing a feed network, high gain and the like, and the microstrip series feed array antenna can obtain a planar microstrip array with high gain by forming the linear arrays of the microstrip unit series feed into the linear arrays. The microstrip array and the microstrip integrated circuit MMIC are integrated on a PCB, so that the structure is compact, the design method and the processing technology are mature, and the microstrip antenna is widely used by vehicle-mounted radars.
The multi-dimensional target detection and recognition core technology is a multi-input/multi-output technology, namely, a plurality of antennas or arrays are used for information transmission at the transmitting end and the receiving end of a wireless communication system, and the multi-dimensional target detection and recognition core technology has become the most effective way for improving the data transmission rate and quality on a wireless channel. In order to further improve the transmission rate of wireless communication and the resolution of the radar, the millimeter wave frequency band gradually becomes a research focus, and the 77Ghz frequency band is a main direction of radar development in the current traffic field.
Microstrip antenna has advantages of small size, light weight, low profile, etc., and is widely used in radar and communication fields. The 77GHz millimeter wave radar antenna commonly adopted in the current market is in the form of a series fed microstrip antenna, but the bandwidth of the series fed microstrip array antenna is narrower, and the following problems still exist in the design and processing process: (1) The performance of 77GHz millimeter wave microstrip patch antennas, particularly the resonant frequency, is very sensitive to machining errors, and the current level of machining technology results in frequency deviations of hundreds of MHz from the design results for actual measurement, or even more. Repeated plate making and adjustment are needed, and the development period is prolonged. (2) The conventional comb antenna has wider bandwidth, solves the problem of the microstrip patch antenna caused by narrow bandwidth, but has complex design, different sizes of each comb tooth radiating element, different intervals of the radiating elements and complex design and calculation.
Disclosure of Invention
The invention aims to provide a novel vehicle-mounted millimeter wave radar comb antenna so as to solve the problems in the background technology.
In order to achieve the above object, the present invention provides the following technical solutions: the novel vehicle-mounted millimeter wave radar comb antenna comprises a medium substrate, a comb array antenna and a metal floor, wherein the comb array antenna is fixedly arranged on the medium substrate, and the metal floor is fixedly connected to the bottom of the medium substrate;
the comb-shaped array antenna comprises microstrip feeder lines, wherein antenna radiation units are fixedly arranged on the microstrip feeder lines at equal intervals, a first impedance matching transformer is fixedly arranged at a T-shaped connecting position where the microstrip feeder lines are connected with the antenna radiation units, a second impedance matching transformer is fixedly arranged at an L-shaped inflection point where the upper ends of the microstrip feeder lines are connected with the antenna radiation units, and the microstrip feeder lines are fixedly connected to a medium substrate.
Preferably, the number of the antenna radiating elements is eighteen, the antenna radiating elements are connected in series through the microstrip feeder and are arranged in the positive and negative directions centering on the microstrip feeder, the distance between adjacent antenna radiating elements is about half a guided wave wavelength, and each antenna radiating element has the same phase.
Preferably, the dielectric substrate is Rogers RO3003, has a dielectric constant of 3 and a thickness of 0.127mm.
Preferably, each of the antenna radiating elements is composed of a microstrip loaded square patch and is equal in size.
Preferably, the first impedance matching transformer and the second impedance matching transformer are square in shape.
Preferably, the microstrip feed line is a 50 ohm microstrip feed line.
Preferably, the comb array antenna is made of a 77GHz dielectric substrate-based material.
The beneficial effects of the invention are as follows:
according to the invention, the comb-shaped antenna is simple in design, the radiating units are identical in size and interval, the tolerance of the antenna is improved, the design of the antenna is simplified, and the antenna can be designed and processed easily; a 50 ohm microstrip feeder line is adopted, so that good broadband impedance matching can be realized; the antenna disclosed by the invention is less affected by machining tolerance, good and stable in antenna radiation consistency, and has engineering practicability such as miniaturization, low cost, easiness in machining and the like.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a comb array antenna according to the present invention;
FIG. 3 is a schematic diagram of a portion of a comb array antenna of the present invention;
FIG. 4 is a schematic diagram of standing wave coefficients of a comb array antenna according to the present invention;
fig. 5 is a schematic diagram of the radiation direction of the comb array antenna according to the present invention.
In the figure: 1. a dielectric substrate; 2. a comb array antenna; 201. a microstrip feed line; 202. a first impedance matching transformer; 203. an antenna radiation unit; 204. a second impedance matching transformer; 3. a metal floor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 5, the embodiment of the invention provides a novel vehicle-mounted millimeter wave radar comb antenna, which comprises a medium substrate 1, a comb array antenna 2 and a metal floor 3, wherein the comb array antenna 2 is fixedly arranged on the medium substrate 1, and the metal floor 3 is fixedly connected with the bottom of the medium substrate 1;
the comb-shaped array antenna 2 comprises a microstrip feeder 201, wherein an antenna radiation unit 203 is fixedly arranged on the microstrip feeder 201 at equal intervals, a first impedance matching transformer 202 is fixedly arranged at a T-shaped connection part of the microstrip feeder 201 and the antenna radiation unit 203, a second impedance matching transformer 204 is fixedly arranged at an L-shaped inflection point of the upper end of the microstrip feeder 201 and the antenna radiation unit 203, and the microstrip feeder 201 is fixedly connected to a dielectric substrate 1;
the working principle and beneficial effects of the technical scheme are as follows: the comb-shaped antenna is simple in design, the radiating units are identical in size and interval, the tolerance of the antenna is improved, the design of the antenna is simplified, and the antenna can be designed and processed easily; a 50 ohm microstrip feeder line is adopted, so that good broadband impedance matching can be realized; the antenna disclosed by the invention is less affected by machining tolerance, good and stable in antenna radiation consistency, and has engineering practicability such as miniaturization, low cost, easiness in machining and the like.
In one embodiment, the number of the antenna radiation units 203 is eighteen, and the antenna radiation units 203 are connected in series through the microstrip feeder 201 and are arranged in the positive and negative directions with the microstrip feeder 201 as the center, the distance between adjacent antenna radiation units 203 is about half of the wave guide wavelength, and each antenna radiation unit 203 has the same phase;
the working principle and beneficial effects of the technical scheme are as follows: the better radiation directivity can be obtained through the design; at the same time, the antenna radiating elements 203 are geometrically centrosymmetric, the width and length of each antenna radiating element 203 are equal, and the distance between every two adjacent antenna radiating elements 203 is also equal.
In one embodiment, the dielectric substrate 1 is Rogers RO3003, and has a dielectric constant of 3 and a thickness of 0.127mm;
the working principle and beneficial effects of the technical scheme are as follows: the size of the antenna radiation unit 203 is smaller than that of a pure microstrip line radiation unit of a conventional comb-shaped antenna, so that the size in the polarization direction of the antenna is shortened, a small-space antenna array is conveniently formed, the working frequency band of the antenna radiation unit 203 is near 77GHz, and the caliber of the antenna array is about 26mmX8mm.
In one embodiment each antenna radiating element 203 is comprised of microstrip loaded square patches and is equal in size;
the working principle and beneficial effects of the technical scheme are as follows: the design shortens the dimension of the antenna in the polarization direction, and is convenient for forming a small-space antenna array.
In one embodiment the first impedance matching transformer 202 and the second impedance matching transformer 204 are square in shape;
the working principle and beneficial effects of the technical scheme are as follows: the reflection coefficient of the input port of the novel comb-shaped array antenna can be optimized by adjusting the first impedance matching converter 202 and the second impedance matching converter 204, so that the antenna radiation unit 203 is in matched connection with the 50 ohm comb-shaped array antenna 2; as shown in FIG. 4, the standing wave coefficient of the comb array antenna is smaller than 2.0 in the frequency band of 76 GHz-77 GHz, thereby meeting the use requirement of the system radar broadband.
Microstrip feed line 201 is a 50 ohm microstrip feed line in one embodiment;
the working principle and beneficial effects of the technical scheme are as follows: the antenna array can be connected to the pins of the radar chip through the extension of the microstrip feeder 201, and the design is convenient for being directly welded and connected with the pins of the millimeter wave radar chip.
In one embodiment the comb array antenna 2 is made of a 77GHz based dielectric substrate material;
the working principle and beneficial effects of the technical scheme are as follows: the antenna is suitable for electromagnetic waves with millimeter wave frequency below 77GHz, wherein the working frequency band of the antenna radiation unit 203 is around 77GHz, and the caliber of an antenna array is about 26mmX8mm.
As shown in fig. 5, the radiation pattern of the comb-array antenna 2 has a pitch-plane beam width of about 9 ° and an azimuth-plane beam width of about 102 °.
Working principle and using flow:
according to the invention, the comb-shaped antenna is simple in design, the radiating units are identical in size and interval, the tolerance of the antenna is improved, the design of the antenna is simplified, and the antenna can be designed and processed easily; a 50 ohm microstrip feeder 201 is adopted, so that good broadband impedance matching can be realized; the antenna disclosed by the invention is less affected by machining tolerance, good and stable in antenna radiation consistency, and has engineering practicability such as miniaturization, low cost, easiness in machining and the like.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The utility model provides a novel vehicle-mounted millimeter wave radar comb antenna, includes dielectric substrate (1), comb array antenna (2) and metal floor (3), its characterized in that: the comb-shaped array antenna (2) is fixedly arranged on the medium substrate (1), and the bottom of the medium substrate (1) is fixedly connected with the metal floor (3);
the comb-shaped array antenna (2) comprises a microstrip feeder line (201), antenna radiation units (203) are fixedly mounted on the microstrip feeder line (201) at equal intervals, a first impedance matching transformer (202) is fixedly mounted at a T-shaped connection position where the microstrip feeder line (201) is connected with the antenna radiation units (203), a second impedance matching transformer (204) is fixedly mounted at an L-shaped inflection point where the upper end of the microstrip feeder line (201) is connected with the antenna radiation units (203), and the microstrip feeder line (201) is fixedly connected to a medium substrate (1).
2. The novel vehicle-mounted millimeter wave radar comb antenna according to claim 1, wherein: the number of the antenna radiation units (203) is eighteen, the antenna radiation units are connected in series through the microstrip feeder line (201) and are arranged in the positive and negative directions with the microstrip feeder line (201) as the center, the distance between adjacent antenna radiation units (203) is about half of the guided wave wavelength, and each antenna radiation unit (203) has the same phase.
3. The novel vehicle-mounted millimeter wave radar comb antenna according to claim 1, wherein: the dielectric substrate (1) is Rogers RO3003, has a dielectric constant of 3 and a thickness of 0.127mm.
4. The novel vehicle-mounted millimeter wave radar comb antenna according to claim 1, wherein: each antenna radiating element (203) is composed of a microstrip loaded square patch and is equal in size.
5. The novel vehicle-mounted millimeter wave radar comb antenna according to claim 1, wherein: the first impedance matching transformer (202) and the second impedance matching transformer (204) are square in shape.
6. The novel vehicle-mounted millimeter wave radar comb antenna according to claim 1, wherein: the microstrip feeder (201) is a 50 ohm microstrip feeder.
7. The novel vehicle-mounted millimeter wave radar comb antenna according to claim 1, wherein: the comb-shaped array antenna (2) is made of a 77 GHz-based dielectric substrate material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310186526.2A CN116111334A (en) | 2023-02-28 | 2023-02-28 | Novel vehicle-mounted millimeter wave radar comb antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310186526.2A CN116111334A (en) | 2023-02-28 | 2023-02-28 | Novel vehicle-mounted millimeter wave radar comb antenna |
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| CN116111334A true CN116111334A (en) | 2023-05-12 |
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| CN202310186526.2A Pending CN116111334A (en) | 2023-02-28 | 2023-02-28 | Novel vehicle-mounted millimeter wave radar comb antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117060049A (en) * | 2023-09-13 | 2023-11-14 | 南京林业大学 | Design method of comb-shaped microstrip antenna of vehicle-mounted millimeter wave radar |
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2023
- 2023-02-28 CN CN202310186526.2A patent/CN116111334A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117060049A (en) * | 2023-09-13 | 2023-11-14 | 南京林业大学 | Design method of comb-shaped microstrip antenna of vehicle-mounted millimeter wave radar |
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