CN112103666A - Automobile anti-collision radar array antenna - Google Patents
Automobile anti-collision radar array antenna Download PDFInfo
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- CN112103666A CN112103666A CN202010946955.1A CN202010946955A CN112103666A CN 112103666 A CN112103666 A CN 112103666A CN 202010946955 A CN202010946955 A CN 202010946955A CN 112103666 A CN112103666 A CN 112103666A
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- array
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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
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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
Abstract
The invention discloses an automobile anti-collision radar array antenna, which comprises a four-transmitting four-receiving radar chip bonding pad, a first receiving linear antenna array, a second receiving linear antenna array, a third receiving linear antenna array, a fourth receiving linear antenna array, a first transmitting linear antenna array, a second transmitting linear antenna array, a third transmitting linear antenna array, a fourth transmitting linear antenna array and a transmitting power distribution matching network. The scheme of the invention can realize the radar multi-azimuth detection function of horizontal and vertical azimuth, and has high gain, high precision and high resolution, and can realize the millimeter wave radar system scheme for long-distance detection.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted millimeter wave radar antennas, in particular to an automobile anti-collision radar array antenna.
Background
In recent years, as an advanced driving assistance system technology necessary for breaking through future unmanned technology, the vehicle-mounted millimeter wave radar technology is rapidly developing. Optical camera and laser radar are compared to on-vehicle millimeter wave radar, have not fear all-weather detection ability and detection distance of rain fog dust haze far away, have advantages such as resolution ratio height and small in size simultaneously. The vehicle-mounted radar is divided into three types according to distance, namely long distance, medium distance and short distance. Long range radars typically employ high gain antennas to achieve far detection requirements, but their field of view (FOV) is also rapidly decreasing, and therefore typically only covers the detection of the current lane and adjacent lanes. Mid-range radars typically employ low gain antennas in exchange for a larger FOV. Thus, longer detection distances and larger fields of view generally require a corresponding tradeoff.
At present, the existing automotive millimeter wave radar structure in the market mainly adopts a traditional microstrip line series feed structure or a series feed array structure, the radiation characteristic of an antenna is difficult to control, and the processing consistency is poor; the suppression of the sidelobe level needs to be improved, and the angle resolution capability is poor; interference factors of target echo amplitude fluctuation exist in a single TX-RX reflection path; the system does not have the function of synchronous detection in the horizontal and vertical directions, and cannot meet the index requirements of the scheme of the millimeter wave radar system for medium-distance and long-distance detection.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the structure of the automobile anti-collision radar array antenna, which improves the antenna radiation and impedance matching characteristics by adopting a four-transmitting four-receiving antenna array mode and adopting six slot pin-cutting patch array elements with same phase and equal amplitude as a basic unit structure.
The technical scheme of the invention is as follows: an automobile anti-collision radar array antenna comprises a four-transmitting four-receiving radar chip bonding pad, a first receiving linear antenna array, a second receiving linear antenna array, a third receiving linear antenna array, a fourth receiving linear antenna array, a first transmitting linear antenna array, a second transmitting linear antenna array, a third transmitting linear antenna array and a fourth transmitting linear antenna array.
The invention has the beneficial effects that: the technical scheme of the invention has the advantage of high stability, can meet the requirements of the millimeter wave radar antenna with high gain, high precision and high resolution, and can realize the scheme of the millimeter wave radar system for long-distance detection.
The further technical scheme is as follows: the first to fourth input ends of the millimeter wave radar chip interface are respectively connected with the input ends of the first receiving linear array antenna, the second receiving linear array antenna, the third receiving linear array antenna and the fourth receiving linear array antenna through four 50-ohm microstrip lines with the same length; the first to fourth output ends of the millimeter wave radar chip interface are connected with the input ends of the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array through four 50 ohm microstrip lines with the same length.
The beneficial effect of adopting the further scheme is that the sensitivity of the millimeter wave radar can be improved by adopting four equal-phase receiving and transmitting antennas.
The further technical scheme is as follows: the first receiving linear array antenna, the second receiving linear array antenna, the third receiving linear array antenna and the fourth receiving linear array antenna are all formed by a six-element constant-amplitude gap corner-cutting linear array antenna; the input ends of the first transmitting linear antenna array, the second transmitting linear antenna array, the third transmitting linear antenna array and the fourth transmitting linear antenna array are respectively connected with the input end of a transmitting power division matching network, wherein the first output end to the fourth output end of each transmitting power division matching network are respectively connected with four hexabasic constant-amplitude slot angle-cutting linear array antennas, the distance between the hexabasic constant-amplitude slot angle-cutting linear array antennas is 0.5 lambda millimeter, and lambda is an electromagnetic wavelength of a working frequency point.
The beneficial effect of adopting the further scheme is that the gain of the transmitting antenna can be improved by adopting a structure of dividing the antenna into four transmitting antennas.
The further technical scheme is as follows: the six-element constant-amplitude slot corner-cutting linear array antenna is formed by sequentially connecting six slot corner-cutting antenna units in series; the input end of the slot corner-cutting antenna unit is connected with a feeder line TLn which is W0 mm wide and L0 mm long, the other end of the feeder line TLn is connected with a patch antenna which is W mm wide and L mm long, and the other end of the patch antenna is connected with the output end of the slot corner-cutting antenna unit; the patch antenna also has a 45 ° cut angle, while leaving a slot at the feed end that is W1 mm wide and L1 mm long, a T-slot at the center that is W2 mm wide and L2 mm long, and W3 mm wide and L3 mm long, the length of the slot center from the boundary of the patch antenna is L4 mm, where n is 1, 2, 3 … 6.
The technical scheme has the advantages that the linear antenna array can be formed by adopting six rectangular patches with equal amplitude, so that the antenna gain and the radiation directivity are improved, and the detection range and the sensitivity of the radar are improved; meanwhile, the feed end is slotted, so that the radiation characteristic of the millimeter wave radar antenna can be optimized; the T-shaped slot obtains single-mode transmission by destroying the continuity of current in the TM01 mode of the antenna, improves the polarization purity, and realizes the circular polarization of the antenna and expands the bandwidth by increasing perturbation.
The further technical scheme is as follows: the input end of the transmitting power division matching network is connected with a microstrip line TL7, the other end of the TL7 is simultaneously connected with microstrip lines TL8 and TL13, the other end of the microstrip line TL8 is simultaneously connected with microstrip lines TL9 and TL10, and the other end of the TL9 is connected with a third output end of the transmitting power division matching network; the other end of the microstrip line TL10 is sequentially connected with microstrip lines TL11 and TL12 in series, and the other end of the TL12 is connected with a fourth output end of the transmitting power division matching network; the other end of the microstrip line TL13 is simultaneously connected with microstrip lines TL14 and TL15, and the other end of the TL14 is connected with a second output end of the transmitting power division matching network; the other end of the microstrip line TL15 is sequentially connected with microstrip lines TL16 and TL17 in series, and the other end of the TL17 is connected with a first output end of the transmitting power division matching network; the first, second, third and fourth output ends of the transmitting power division matching network are sequentially arranged and distributed from left to right
The further scheme has the advantages that the size and the position of the parasitic element of the transmitting antenna can be controlled, and the impedance matching characteristic is improved.
The further technical scheme is as follows: the automobile anti-collision radar array antenna has two modes when being arranged in a layout, and in the two arrangement modes, a first receiving linear antenna array, a second receiving linear antenna array, a third receiving linear antenna array and a fourth receiving linear antenna array are all arranged and distributed under a four-transmitting and four-receiving radar chip bonding pad in sequence from left to right, the pointing directions of the first receiving linear antenna array, the second receiving linear antenna array, the third receiving linear antenna array and the fourth receiving linear antenna array are all downward, and the horizontal spacing is 0.5 lambda millimeter; in the first arrangement mode, the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array are respectively arranged at the left side, the upper right side and the right side of a bonding pad of the four-transmitting four-receiving radar chip, and the directions of the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array are respectively the left side, the upper; in the second arrangement mode, the first transmitting line array, the second transmitting line array, the third transmitting line array and the fourth transmitting line array are respectively arranged at the left side, the upper right side and the right side of the four-transmitting and four-receiving radar chip bonding pad, and the directions are respectively the left direction, the right direction and the right direction.
The further scheme has the advantages that the distance between the adjacent receiving antennas is kept at 0.5 lambda millimeter, so that accurate phase control can be realized, an antenna directional pattern when the four receiving antennas are combined into an antenna array is improved, and antenna gain is improved; meanwhile, the transmitting antenna arrays in the two arrangement modes meet the distribution condition of a sparse matrix, the aperture of the antenna can be improved, the main beam of the antenna is narrowed, the angle resolution capability is improved, a plurality of TX-RX reflection paths exist simultaneously, the interference factor of the fluctuation of the target echo amplitude is improved to a certain extent, and meanwhile, the transmitting antenna has different orientation, and the function of synchronous detection in the horizontal direction and the vertical direction can be realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an array antenna for an automotive anti-collision radar according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a six-element constant-amplitude slot corner-cut linear array antenna in an automotive anti-collision radar array antenna according to a specific embodiment of the present invention.
Fig. 3 is a circuit layout of a slot corner cut antenna unit in an automotive anti-collision radar array antenna according to an embodiment of the present invention.
Fig. 4 is a schematic circuit diagram of a transmit power division matching network in an automotive anti-collision radar array antenna according to an embodiment of the present invention.
Fig. 5 is a layout of a first overall circuit layout mode of an automotive anti-collision radar array antenna according to an embodiment of the present invention.
Fig. 6 is a layout of a second overall circuit layout mode of the automobile anti-collision radar array antenna according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The anti-collision radar array antenna for an automobile provided in this embodiment includes a four-transmit four-receive radar chip pad, a first receive line type antenna array, a second receive line type antenna array, a third receive line type antenna array, a fourth receive line type antenna array, a first transmit line type antenna array, a second transmit line type antenna array, a third transmit line type antenna array, and a fourth transmit line type antenna array, as shown in fig. 1.
As shown in fig. 1, 5 and 6, the first to fourth input ends of the millimeter wave radar chip interface are respectively connected to the input ends of the first, second, third and fourth linear receiving antennas through four 50-ohm microstrip lines with equal lengths; the first to fourth output ends of the millimeter wave radar chip interface are connected with the input ends of the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array through four 50 ohm microstrip lines with the same length.
As shown in fig. 5 and 6, the first receiving linear array antenna, the second receiving linear array antenna, the third receiving linear array antenna, and the fourth receiving linear array antenna are all formed by a six-element equal-amplitude slot corner-cut linear array antenna; the input ends of the first transmitting linear antenna array, the second transmitting linear antenna array, the third transmitting linear antenna array and the fourth transmitting linear antenna array are respectively connected with the input end of a transmitting power division matching network, wherein the first output end to the fourth output end of each transmitting power division matching network are respectively connected with four hexabasic constant-amplitude slot angle-cutting linear array antennas, the distance between the hexabasic constant-amplitude slot angle-cutting linear array antennas is 0.5 lambda millimeter, and lambda is an electromagnetic wavelength of a working frequency point.
As shown in fig. 2 and 3, the six-element constant-amplitude slot corner-cut linear array antenna is formed by sequentially connecting six slot corner-cut antenna units in series; the input end of the slot corner-cutting antenna unit is connected with a feeder line TLn which is W0 mm wide and L0 mm long, the other end of the feeder line TLn is connected with a patch antenna which is W mm wide and L mm long, and the other end of the patch antenna is connected with the output end of the slot corner-cutting antenna unit; the patch antenna also has a 45 ° cut angle, while leaving a slot at the feed end that is W1 mm wide and L1 mm long, a T-slot at the center that is W2 mm wide and L2 mm long, and W3 mm wide and L3 mm long, the length of the slot center from the boundary of the patch antenna is L4 mm, where n is 1, 2, 3 … 6.
As shown in fig. 4, the input end of the transmit power division matching network is connected to microstrip line TL7, the other end of TL7 is connected to microstrip lines TL8 and TL13, the other end of microstrip line TL8 is connected to microstrip lines TL9 and TL10, and the other end of TL9 is connected to the third output end of the transmit power division matching network; the other end of the microstrip line TL10 is sequentially connected with microstrip lines TL11 and TL12 in series, and the other end of the TL12 is connected with a fourth output end of the transmitting power division matching network; the other end of the microstrip line TL13 is simultaneously connected with microstrip lines TL14 and TL15, and the other end of the TL14 is connected with a second output end of the transmitting power division matching network; the other end of the microstrip line TL15 is sequentially connected with microstrip lines TL16 and TL17 in series, and the other end of the TL17 is connected with a first output end of the transmitting power division matching network; the first, second, third and fourth output ends of the transmitting power division matching network are sequentially arranged and distributed from left to right
As shown in fig. 5 and 6, when the antennas in the automotive anti-collision radar array antenna are arranged in a layout, two modes exist, in the two arrangement modes, a first receiving linear antenna array, a second receiving linear antenna array, a third receiving linear antenna array and a fourth receiving linear antenna array are all arranged right below a four-transmitting four-receiving radar chip bonding pad and are all sequentially distributed from left to right, the pointing directions of the first receiving linear antenna array, the second receiving linear antenna array, the third receiving linear antenna array and the fourth receiving linear antenna array are all downward, and the horizontal spacing of the first receiving linear antenna array, the second receiving linear antenna array; in the first arrangement mode, the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array are respectively arranged at the left side, the upper right side and the right side of a bonding pad of the four-transmitting four-receiving radar chip, and the directions of the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array are respectively the left side, the upper; in the second arrangement mode, the first transmitting line array, the second transmitting line array, the third transmitting line array and the fourth transmitting line array are respectively arranged at the left side, the upper right side and the right side of the four-transmitting and four-receiving radar chip bonding pad, and the directions are respectively the left direction, the right direction and the right direction.
The above detailed description is directed to an automotive anti-collision radar array antenna provided by an embodiment of the present invention, and the technical solution of the present invention is described herein by using specific examples, which are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention.
Claims (6)
1. An automobile anti-collision radar array antenna is characterized by comprising a four-transmitting four-receiving radar chip bonding pad, a first receiving linear antenna array, a second receiving linear antenna array, a third receiving linear antenna array, a fourth receiving linear antenna array, a first transmitting linear antenna array, a second transmitting linear antenna array, a third transmitting linear antenna array and a fourth transmitting linear antenna array.
2. The high-gain automotive millimeter wave radar array antenna according to claim 1, wherein the first to fourth input ends of the millimeter wave radar chip interface are respectively connected to the input ends of the first, second, third and fourth receiving linear array antennas through four 50 ohm microstrip lines with equal lengths; the first to fourth output ends of the millimeter wave radar chip interface are connected with the input ends of the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array through four 50-ohm microstrip lines with the same length.
3. The array antenna for the automobile anti-collision radar as claimed in claim 1, wherein the first receiving linear array antenna, the second receiving linear array antenna, the third receiving linear array antenna and the fourth receiving linear array antenna are all formed by a six-membered constant-amplitude slot corner-cut linear array antenna; the input ends of the first transmitting linear antenna array, the second transmitting linear antenna array, the third transmitting linear antenna array and the fourth transmitting linear antenna array are respectively connected with the input end of a transmitting power division matching network, wherein the first output end to the fourth output end of each transmitting power division matching network are respectively connected with four hexabasic constant-amplitude slot angle-cutting linear array antennas, the distance between the hexabasic constant-amplitude slot angle-cutting linear array antennas is 0.5 lambda millimeter, and lambda is an electromagnetic wavelength of a working frequency point.
4. The hexabasic constant-amplitude slot corner-cut linear array antenna of claim 3, wherein the hexabasic constant-amplitude slot corner-cut linear array antenna is composed of six slot corner-cut antenna units connected in series in sequence; the input end of the slot corner-cutting antenna unit is connected with a feeder line TLn which is W0 mm wide and L0 mm long, the other end of the feeder line TLn is connected with a patch antenna which is W mm wide and L mm long, and the other end of the patch antenna is connected with the output end of the slot corner-cutting antenna unit; the patch antenna also has a 45 ° cut angle, while leaving a slot at the feed end that is W1 mm wide and L1 mm long, a T-slot at the center that is W2 mm wide and L2 mm long, and W3 mm wide and L3 mm long, the length of the slot center from the boundary of the patch antenna is L4 mm, where n is 1, 2, 3 … 6.
5. The transmission power division matching network of claim 3, wherein an input end of the transmission power division matching network is connected to microstrip line TL7, the other end of TL7 is simultaneously connected to microstrip lines TL8 and TL13, the other end of microstrip line TL8 is simultaneously connected to microstrip lines TL9 and TL10, and the other end of TL9 is connected to a third output end of the transmission power division matching network; the other end of the microstrip line TL10 is sequentially connected with microstrip lines TL11 and TL12 in series, and the other end of the TL12 is connected with the fourth output end of the transmitting power division matching network; the other end of the microstrip line TL13 is simultaneously connected with microstrip lines TL14 and TL15, and the other end of the TL14 is connected with the second output end of the transmitting power division matching network; the other end of the microstrip line TL15 is sequentially connected with microstrip lines TL16 and TL17 in series, and the other end of the TL17 is connected with the first output end of the transmitting power division matching network; the first output end, the second output end, the third output end and the fourth output end of the transmission power division matching network are sequentially distributed from left to right.
6. The automobile anti-collision radar array antenna according to claim 1, wherein two modes exist in layout arrangement of each antenna in the automobile anti-collision radar array antenna, and in the two modes, the first receiving linear antenna array, the second receiving linear antenna array, the third receiving linear antenna array and the fourth receiving linear antenna array are all arranged right below the four-transmitting and four-receiving radar chip bonding pad and are all distributed in a sequential arrangement from left to right, the pointing directions of the first receiving linear antenna array, the second receiving linear antenna array, the third receiving linear antenna array and the fourth receiving linear antenna array are all downward, and the horizontal spacing of the first receiving linear antenna array, the second receiving linear antenna array, the third receiving linear antenna array and; in the first arrangement mode, the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array are respectively arranged at the left side, the upper right side and the right side of the four-transmitting and four-receiving radar chip bonding pad, and the directions of the first transmitting line type antenna array, the second transmitting line type antenna array, the third transmitting line type antenna array and the fourth transmitting line type antenna array are respectively the left side, the upper left side; in the second arrangement mode, the first transmitting line array, the second transmitting line array, the third transmitting line array and the fourth transmitting line array are respectively arranged at the left side, the upper right side and the right side of the four-transmitting and four-receiving radar chip bonding pad, and the directions of the first transmitting line array, the second transmitting line array, the third transmitting line array and the fourth transmitting line array are respectively the left direction, the right direction and the right direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946955.1A CN112103666A (en) | 2020-09-10 | 2020-09-10 | Automobile anti-collision radar array antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010946955.1A CN112103666A (en) | 2020-09-10 | 2020-09-10 | Automobile anti-collision radar array antenna |
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| CN112103666A true CN112103666A (en) | 2020-12-18 |
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| CN202010946955.1A Pending CN112103666A (en) | 2020-09-10 | 2020-09-10 | Automobile anti-collision radar array antenna |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113659335A (en) * | 2021-10-21 | 2021-11-16 | 成都雷电微力科技股份有限公司 | Broadband series-feed thin-cloth array antenna unit |
| WO2022211725A1 (en) * | 2021-03-30 | 2022-10-06 | Agency For Science, Technology And Research | Antenna array, array arrangement and methods of forming the same |
-
2020
- 2020-09-10 CN CN202010946955.1A patent/CN112103666A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022211725A1 (en) * | 2021-03-30 | 2022-10-06 | Agency For Science, Technology And Research | Antenna array, array arrangement and methods of forming the same |
| CN113659335A (en) * | 2021-10-21 | 2021-11-16 | 成都雷电微力科技股份有限公司 | Broadband series-feed thin-cloth array antenna unit |
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