CN212934860U - Array antenna for millimeter wave radar sensor - Google Patents
Array antenna for millimeter wave radar sensor Download PDFInfo
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- CN212934860U CN212934860U CN202021977159.6U CN202021977159U CN212934860U CN 212934860 U CN212934860 U CN 212934860U CN 202021977159 U CN202021977159 U CN 202021977159U CN 212934860 U CN212934860 U CN 212934860U
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Abstract
The utility model discloses an array antenna for millimeter wave radar sensor, receive the line array antenna including millimeter wave transceiver chip pad, first receipt line array antenna, second receipt line array antenna, third receipt line array antenna, fourth receipt line array antenna, first transmission line array antenna, second transmission line array antenna, third transmission line array antenna, the utility model discloses the core framework adopts the antenna array mode that three were sent out four receipts to adopt ten homophase unequal amplitude angle feed array elements as the basic unit structure, control the size and the position of parasitic unit of antenna, rationally restrain the antenna minor lobe level and optimize the radiation characteristic of antenna, combine symmetrical structure's corner cut circular polarization method and the grooved composite method in surface, improve impedance matching characteristic. The utility model discloses a scheme can reach high accuracy, high response speed and high resolution, can realize the millimeter wave radar system scheme that is used for well distance and remote detection.
Description
Technical Field
The utility model relates to an on-vehicle millimeter wave radar antenna technical field especially relates to an array antenna for millimeter wave radar sensor.
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; the single TX-RX reflection path has interference factors of fluctuation of target echo amplitude, and cannot meet the index requirements of a millimeter wave radar system scheme for medium-distance and long-distance detection.
SUMMERY OF THE UTILITY MODEL
In order to overcome the shortcomings of the prior art, the utility model aims to provide a structure for millimeter wave radar sensor's array antenna is through adopting the antenna array mode of three-shot four-shot to adopt the homophase non-constant amplitude angle to present ten array elements as the elementary cell structure improvement antenna radiation and impedance matching characteristic.
The technical scheme of the utility model is that: an array antenna for a millimeter wave radar sensor comprises a millimeter wave transceiver 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 and a third transmitting linear antenna array.
The utility model has the advantages that: the technical scheme of the utility model have high stability, miniaturization and low-cost advantage, can satisfy the demand of the millimeter wave radar antenna of high accuracy, high response speed and high resolution simultaneously, can realize the millimeter wave radar system scheme that is used for low-cost, small, the high performance of medium-distance and remote detection.
The further technical scheme is as follows: the first to fourth input ends of the millimeter wave transceiving chip bonding pad are respectively connected with the input ends of 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 through four 50-ohm microstrip lines with the same length; the first to third output ends of the millimeter wave transceiving chip bonding pad are respectively connected with the input ends of the first transmitting line type antenna array, the second transmitting line type antenna array and the third transmitting line type antenna array through three 50-ohm microstrip lines with the same length.
The further scheme has the advantages that the antenna gain can be improved by adopting a three-transmitting four-receiving antenna mode; the receiving sensitivity of the millimeter wave radar can be improved by adopting four equal-phase receiving antennas, and the transmitting efficiency of the millimeter wave radar can be improved by adopting the feeder line length with the length difference being integral multiple of the electromagnetic wavelength of the working frequency point.
The further technical scheme is as follows: 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 formed by one angular-fed ten-element non-uniform-amplitude linear antenna subunit; the first emitting linear antenna array, the second emitting linear antenna array and the third emitting linear antenna array are all formed by two angle-fed ten-element non-uniform-amplitude linear antenna subunits through a two-section microstrip line composite structure, the distance between the two subunits is 0.5 lambda millimeter, lambda is an electromagnetic wavelength of a working frequency point, and middle feeding points of the composite structure are input ends of the first emitting linear antenna array, the second emitting linear antenna array and the third emitting linear antenna array respectively.
The beneficial effect of adopting the further scheme is that: the gain of the transmitting antenna can be improved by adopting a mode of synthesizing two angle-fed ten-element non-constant-amplitude linear antenna subunits, so that the sensitivity of the vehicle-mounted radar is improved.
The further technical scheme is as follows: the input end of the angle-fed ten-element non-uniform-amplitude linear antenna subunit is sequentially connected with microstrip line feed lines TL1, TL2, TL3, TL4, TL5, TL6, TL7, TL8, TL9 and TL10 from bottom to top in the vertical direction, and the input end of the angle-fed ten-element non-uniform-amplitude linear antenna subunit is W0 mm wide and L0 mm long; the feeder lines TL1 to TL10 are far away from one end of the input end and are respectively connected with rectangular patches No. 1 to No. 10, the rectangular patches No. 1, 3, 5, 7 and 9 are arranged on the right side of the feeder line, the rectangular patches No. 2, 4, 6, 8 and 10 are arranged on the left side of the feeder line, the rectangular patches are L millimeters long in size and W millimeters in widthnMillimeter; the rectangular patch feeding positions are fed in the 45-degree angle direction; the middle part of the rectangular patch from No. 3 to No. 8 is reserved with a welt rectangular groove, and the dimensions of the welt rectangular grooves are all dWnMm width and dLnMm long, and dJ is reserved on the other side of the microstrip line of each rectangular patch 45-degree angle feed endnMm width and dHnThe lengths of the millimeter-long reflection cancellation slots and the feed ends of the reflection cancellation slots at 45 degrees from the rectangular patch are dGnMm, where n is 1,2,3 … 10.
The adoption of the further scheme has the beneficial effects that a linear antenna array can be formed by adopting ten rectangular patches with unequal amplitudes, so that the antenna gain and the radiation directivity are improved, and the detection range and the sensitivity of the radar are improved; meanwhile, a reflection counteracting groove is introduced into the transmission line, the amplitude of a reflection echo is controlled by the size of the groove, the phase difference of two reflection waves is 180 degrees by adjusting the distance between the groove hole and the corner feed patch, so that the electromagnetic wave reflected by the patch is counteracted, standing waves are improved, a welted rectangular groove is formed in the middle of the rectangular patch, single-mode transmission is obtained by destroying the continuity of current in an antenna TM01 mode, the current is transmitted along the main polarization direction, side lobes of the antenna are reduced, and the cross polarization of the antenna is improved. The patch antenna has low production cost and better antenna consistency, and is convenient to install and integrate with circuit functions.
The further technical scheme is as follows: the array antenna for the millimeter wave radar sensor has two modes when being arranged in a layout, in the first arrangement mode, 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 arranged below a bonding pad of the millimeter wave transceiver chip and are sequentially arranged and distributed from left to right, the horizontal spacing of input feed points of the antennas is 0.5 lambda millimeters, the first transmitting linear antenna array, the second transmitting linear antenna array and the third transmitting linear antenna array are arranged above the bonding pad of the millimeter wave transceiver chip and are sequentially arranged and distributed from left to right, and the horizontal spacing of the input feed points of the antennas is lambda millimeters; in the second arrangement mode, the first transmitting line array, the first receiving line array, the second receiving line array, the third receiving line array, the fourth receiving line array, the second transmitting line array and the third transmitting line array are arranged on the right side of the millimeter wave transceiver chip pad and are sequentially arranged from top to bottom, the horizontal distances of the antenna input feed points are respectively 1.25 lambda, 0.5 lambda, 1.25 lambda and 2 lambda, and the input feed position of the second transmitting line array antenna is horizontally extended by 0.5 lambda millimeter compared with the rest antennas.
The further scheme has the advantages that the distance between adjacent 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, and a plurality of TX-RX reflection paths exist simultaneously, so that the interference factor of the fluctuation of the target echo amplitude is improved to a certain extent.
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 described 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 without creative efforts.
Fig. 1 is a schematic block diagram of an array antenna for a millimeter wave radar sensor according to an embodiment of the present invention.
Fig. 2 is a schematic circuit diagram of a ten-element unequal-amplitude linear antenna subunit in an array antenna for a millimeter wave radar sensor according to an embodiment of the present invention.
Fig. 3 is a circuit layout of a ten-element non-uniform-amplitude linear antenna subunit in an array antenna for a millimeter wave radar sensor according to an embodiment of the present invention.
Fig. 4 is a layout of a first array antenna circuit layout mode for a millimeter wave radar sensor according to an embodiment of the present invention.
Fig. 5 is a layout of the array antenna overall circuit arrangement mode two for the millimeter wave radar sensor according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
An array antenna for a millimeter wave radar sensor according to the present embodiment includes a millimeter wave transceiver chip pad, a first receiving line type antenna array, a second receiving line type antenna array, a third receiving line type antenna array, a fourth receiving line type antenna array, a first transmitting line type antenna array, a second transmitting line type antenna array, and a third transmitting line type antenna array, as shown in fig. 1.
As shown in fig. 1, 4 and 5, the first to fourth input ends of the millimeter wave transceiver chip pad are respectively connected to the input ends 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 through four 50 ohm microstrip lines with equal lengths; the first to third output ends of the millimeter wave transceiving chip bonding pad are respectively connected with the input ends of the first transmitting line type antenna array, the second transmitting line type antenna array and the third transmitting line type antenna array through three 50-ohm microstrip lines with the same length.
As shown in fig. 4 and 5, 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 formed by one angle-fed ten-element non-uniform-amplitude linear antenna subunit; the first emitting linear antenna array, the second emitting linear antenna array and the third emitting linear antenna array are all formed by two angle-fed ten-element non-uniform-amplitude linear antenna subunits through a two-section microstrip line composite structure, the distance between the two subunits is 0.5 lambda millimeter, lambda is an electromagnetic wavelength of a working frequency point, and middle feeding points of the composite structure are input ends of the first emitting linear antenna array, the second emitting linear antenna array and the third emitting linear antenna array respectively.
As shown in fig. 2 and fig. 3, the input end of the angle-fed ten-element non-constant-amplitude linear antenna subunit is sequentially connected with microstrip line feeders TL1, TL2, TL3, TL4, TL5, and,TL6, TL7, TL8, TL9 and TL10 which are all W0 mm wide and L0 mm long; the feeder lines TL1 to TL10 are far away from one end of the input end and are respectively connected with rectangular patches No. 1 to No. 10, the rectangular patches No. 1, 3, 5, 7 and 9 are arranged on the right side of the feeder line, the rectangular patches No. 2, 4, 6, 8 and 10 are arranged on the left side of the feeder line, the rectangular patches are L millimeters long in size and W millimeters in widthnMillimeter; the rectangular patch feeding positions are fed in the 45-degree angle direction; the middle part of the rectangular patch from No. 3 to No. 8 is reserved with a welt rectangular groove, and the dimensions of the welt rectangular grooves are all dWnMm width and dLnMm long, and dJ is reserved on the other side of the microstrip line of each rectangular patch 45-degree angle feed endnMm width and dHnThe lengths of the millimeter-long reflection cancellation slots and the feed ends of the reflection cancellation slots at 45 degrees from the rectangular patch are dGnMm, where n is 1,2,3 … 10.
As shown in fig. 4 and 5, when the antennas in the array antenna for the millimeter wave radar sensor are arranged in a layout, two modes exist, in the first arrangement mode, 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 arranged below the millimeter wave transceiver chip pad and are sequentially arranged from left to right, the horizontal spacing of the antenna input feed points is 0.5 λ mm, the first emitting linear antenna array, the second emitting linear antenna array and the third emitting linear antenna array are arranged above the millimeter wave transceiver chip pad and are sequentially arranged from left to right, and the horizontal spacing of the antenna input feed points is λ mm; in the second arrangement mode, the first transmitting line array, the first receiving line array, the second receiving line array, the third receiving line array, the fourth receiving line array, the second transmitting line array and the third transmitting line array are arranged on the right side of the millimeter wave transceiver chip pad and are sequentially arranged from top to bottom, the horizontal distances of the antenna input feed points are respectively 1.25 lambda, 0.5 lambda, 1.25 lambda and 2 lambda, and the input feed position of the second transmitting line array antenna is horizontally extended by 0.5 lambda millimeter compared with the rest antennas.
The above detailed description is made on the array antenna for millimeter wave radar sensor provided by the embodiments of the present invention, and the specific embodiments are applied to the present invention to explain the technical solution of the present invention, and the above embodiments are only preferred embodiments of the present invention, and are not used to limit the protection scope of the present invention, and for those skilled in the art, the changes or improvements that can be considered in the technical scope of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. An array antenna for a millimeter wave radar sensor is characterized by comprising a millimeter wave transceiver 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 and a third transmitting linear antenna array.
2. The array antenna for the millimeter wave radar sensor according to claim 1, wherein the first to fourth input terminals of the millimeter wave transceiver chip pad are respectively connected to the input terminals 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 through four 50 ohm microstrip lines with equal lengths; the first to third output ends of the millimeter wave transceiving chip bonding pad are respectively connected with the input ends of the first transmitting line type antenna array, the second transmitting line type antenna array and the third transmitting line type antenna array through three 50-ohm microstrip lines with the same length.
3. The array antenna for the millimeter wave radar sensor as claimed in claim 1, wherein 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 formed by one angle-fed ten-element non-uniform-amplitude linear antenna subunit; the first emitting line type antenna array, the second emitting line type antenna array and the third emitting line type antenna array are all formed by two angle-fed ten-element non-uniform-amplitude line type antenna subunits through a two-section microstrip line composite structure, the distance between the two subunits is 0.5 lambda millimeter, lambda is an electromagnetic wavelength of a working frequency point, and middle feeding points of the composite structure are input ends of the first emitting line type antenna array, the second emitting line type antenna array and the third emitting line type antenna array respectively.
4. The array antenna for the millimeter wave radar sensor as claimed in claim 3, wherein the input end of the angle-fed ten-element non-uniform amplitude linear antenna subunit is connected with microstrip line feed lines TL1, TL2, TL3, TL4, TL5, TL6, TL7, TL8, TL9 and TL10 in sequence from bottom to top in the vertical direction, and the input end of the angle-fed ten-element non-uniform amplitude linear antenna subunit is W0 mm wide and L0 mm long; the feeder lines TL1 to TL10 are far away from one end of the input end and are respectively connected with rectangular patches No. 1 to No. 10, the rectangular patches No. 1, 3, 5, 7 and 9 are arranged on the right side of the feeder line, the rectangular patches No. 2, 4, 6, 8 and 10 are arranged on the left side of the feeder line, the rectangular patches are L millimeters long in size and W millimeters in widthnMillimeter; the rectangular patch feeding positions are fed in the 45-degree angle direction; the middle part of the rectangular patch from No. 3 to No. 8 is reserved with a welt rectangular groove, and the dimensions of the welt rectangular grooves are all dWnMm width and dLnMm long, and dJ is reserved on the other side of the microstrip line of each rectangular patch 45-degree angle feed endnMm width and dHnThe lengths of the millimeter-long reflection cancellation slots and the feed ends of the reflection cancellation slots at 45 degrees from the rectangular patch are dGnMm, where n is 1,2,3 … 10.
5. The array antenna for the millimeter wave radar sensor as claimed in claim 1, wherein each of the antennas in the array antenna for the millimeter wave radar sensor has two patterns in layout arrangement, in the first arrangement pattern, 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 arranged below the millimeter wave transceiver chip pad and are sequentially arranged and distributed from left to right, the horizontal spacing between the antenna input feed points is 0.5 λ mm, the first transmitting linear antenna array, the second transmitting linear antenna array and the third transmitting linear antenna array are arranged and distributed above the millimeter wave transceiver chip pad and are sequentially arranged and distributed from left to right, and the horizontal spacing between the antenna input feed points is λ mm; in the second arrangement mode, the first transmitting line array, the first receiving line array, the second receiving line array, the third receiving line array, the fourth receiving line array, the second transmitting line array and the third transmitting line array are arranged on the right side of the millimeter wave transceiver chip pad and are sequentially arranged from top to bottom, the horizontal distances of the antenna input feed points are respectively 1.25 lambda, 0.5 lambda, 1.25 lambda and 2 lambda, and the input feed position of the second transmitting line array antenna is horizontally extended by 0.5 lambda millimeter compared with the rest antennas.
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| CN202021977159.6U CN212934860U (en) | 2020-09-10 | 2020-09-10 | Array antenna for millimeter wave radar sensor |
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| CN202021977159.6U CN212934860U (en) | 2020-09-10 | 2020-09-10 | Array antenna for millimeter wave radar sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267954A (en) * | 2021-12-20 | 2022-04-01 | 中国电子科技集团公司第十四研究所 | Large-scale series-fed microstrip array antenna based on virtual array elements |
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2020
- 2020-09-10 CN CN202021977159.6U patent/CN212934860U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267954A (en) * | 2021-12-20 | 2022-04-01 | 中国电子科技集团公司第十四研究所 | Large-scale series-fed microstrip array antenna based on virtual array elements |
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