Automobile anti-collision radar array antenna

Abstract

The present invention discloses a car anti-collision radar array antenna, including a four-transmit and four-receive radar chip 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 division matching network. The core architecture of the present invention adopts a four-transmit and four-receive antenna array mode, and adopts six slotted corner-cut patch array elements with the same phase and amplitude as the basic unit structure, controls the size and position of the antenna parasitic unit, reasonably suppresses the antenna sidelobe level and optimizes the radiation characteristics of the antenna, and improves the impedance matching characteristics. The scheme of the present invention can realize the multi-directional detection function of the radar in the horizontal and vertical directions, and has high gain, high precision and high resolution at the same time, and can realize the millimeter wave radar system scheme for long-distance detection.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted millimeter-wave radar antennas, and in particular to an automobile anti-collision radar array antenna. Background Art

[0002] In recent years, as an advanced driver assistance system technology necessary for breakthrough future driverless technology, automotive millimeter-wave radar technology is developing rapidly. Compared with optical cameras and lidars, automotive millimeter-wave radars have all-weather detection capabilities that are not afraid of rain, fog, dust and haze, and have long detection distances. They also have advantages such as high resolution and compact size. There are three main types of automotive radars according to distance: long-range, medium-range and short-range. Long-range radars usually use high-gain antennas to achieve longer detection needs, but their field of view (FOV) is also rapidly decreasing, so they usually can only cover the current lane and adjacent lanes. Medium-range radars usually use low-gain antennas in exchange for a larger FOV. Therefore, longer detection distances and larger field of view usually require corresponding trade-offs.

[0003] At present, the existing automotive millimeter-wave radar structures on the market mainly adopt the traditional microstrip line series-fed structure or series-fed array structure. The radiation characteristics of the antenna are difficult to control and the processing consistency is poor. The suppression of the sidelobe level needs to be improved, and the angular resolution capability is poor. The single TX-RX reflection path has the interference factor of the target echo amplitude fluctuation. It does not have the function of synchronous detection in the horizontal and vertical directions, and cannot meet the indicator requirements of the millimeter-wave radar system solutions for medium-range and long-range detection. Summary of the invention

[0004] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a structure of an automobile anti-collision radar array antenna, which improves the antenna radiation and impedance matching characteristics by adopting a four-transmit and four-receive antenna array mode and using six slot-cut patch array elements with the same phase and equal amplitude as the basic unit structure.

[0005] The technical solution of the present invention is: an automobile anti-collision radar array antenna, including a four-transmit four-receive radar chip 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.

[0006] The beneficial effects of the present invention are as follows: the technical solution of the present invention has the advantage of high stability, and can meet the requirements of high-gain, high-precision and high-resolution millimeter-wave radar antennas, and can realize a millimeter-wave radar system solution for long-distance detection.

[0007] Its further technical solution is: the first to fourth input ends of the millimeter-wave radar chip interface are respectively connected to 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 of equal length; the first to fourth output ends of the millimeter-wave radar chip interface are connected to 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 through four 50-ohm microstrip lines of equal length.

[0008] The beneficial effect of adopting the above further solution is that the sensitivity of the millimeter wave radar can be improved by adopting four receiving and transmitting antennas with equal phases.

[0009] Its further technical solution is: 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 composed of a six-element equal-amplitude slot cut-angle 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 to the input end of a transmitting power division matching network, wherein the first to fourth output ends of each transmitting power division matching network are respectively connected to four six-element equal-amplitude slot cut-angle linear array antennas, and the spacing between the six-element equal-amplitude slot cut-angle linear array antennas is 0.5λ mm, and λ is an electromagnetic wavelength of an operating frequency.

[0010] The beneficial effect of adopting the above further solution is that the one-to-four transmitting antenna structure can improve the transmitting antenna gain.

[0011] Its further technical solution is: the six-element equal-amplitude slotted angled linear array antenna is composed of six slotted angled antenna units connected in series in sequence; the input end of the slotted angled antenna unit is connected to a feeder line TLn with a width of W0 mm and a length of L0 mm, the other end of the feeder line TLn is connected to a patch antenna with a width of W mm and a length of L mm, and the other end of the patch antenna is connected to the output end of the slotted angled antenna unit; the patch antenna also has a 45° cut angle, and a slot with a width of W1 mm ​​and a length of L1 mm is retained at the feeding end, and a T-shaped slot with a width of W2 mm and a length of L2 mm, as well as a T-shaped slot with a width of W3 mm and a length of L3 mm is retained at the center position, and the length of the slot center from the patch antenna boundary is L4 mm, wherein n=1, 2, 3…6.

[0012] The beneficial effect of adopting the above further scheme is that six equal-amplitude rectangular patches can form a linear antenna array, improve the antenna gain and radiation directivity, and improve the detection range and sensitivity of the radar; at the same time, slotting at the feeding end can optimize the radiation characteristics of the millimeter-wave radar antenna; the T-shaped slot destroys the continuity of the current in the TM01 mode of the antenna to obtain single-mode transmission, improve the polarization purity, and realize the circular polarization of the antenna and expand the bandwidth by increasing the perturbation.

[0013] Its further technical solution is: the input end of the transmitting power division matching network is connected to the microstrip line TL7, the other end of TL7 is simultaneously connected to the microstrip lines TL8 and TL13, the other end of the microstrip line TL8 is simultaneously connected to the microstrip lines TL9 and TL10, and the other end of TL9 is connected to the third output end of the transmitting power division matching network; the other end of the microstrip line TL10 is sequentially connected in series with the microstrip lines TL11 and TL12, and the other end of TL12 is connected to the fourth output end of the transmitting power division matching network; the other end of the microstrip line TL13 is simultaneously connected to the microstrip lines TL14 and TL15, and the other end of TL14 is connected to the second output end of the transmitting power division matching network; the other end of the microstrip line TL15 is sequentially connected in series with the microstrip lines TL16 and TL17, and the other end of TL17 is connected to the 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

[0014] The beneficial effect of adopting the above further solution is that the size and position of the parasitic unit of the transmitting antenna can be controlled to improve the impedance matching characteristics.

[0015] Its further technical solution is: there are two modes when the antennas in the automobile anti-collision radar array antenna are arranged in the layout. In the two arrangement 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 directly below the four-transmit four-receive radar chip pads, and are arranged in sequence from left to right, pointing downward, and their horizontal spacing is 0.5λ mm; in arrangement mode one, the first transmitting linear antenna array, the second transmitting linear antenna array, the third receiving linear antenna array, and the fourth receiving linear antenna array are all directly below the four-transmit four-receive radar chip pads, and are all .... The third transmitting linear antenna array and the fourth transmitting linear antenna array are respectively arranged on the left side, upper left side, upper right side, and right side of the four-transmit four-receive radar chip pad, and they are pointed to the left, upper side, upper side, and right respectively; in arrangement mode two, 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 arranged on the left side, upper left side, upper right side, and right side of the four-transmit four-receive radar chip pad, and they are pointed to the left, left, right, and right respectively.

[0016] The beneficial effect of adopting the above further scheme is that the spacing between adjacent receiving antennas is maintained at 0.5λ mm, which can achieve precise phase control, improve the antenna radiation pattern when four receiving antennas are combined into an antenna array, and increase the antenna gain; at the same time, the transmitting antenna array in the two arrangement modes meets the distribution conditions of the sparse matrix, which can improve the antenna aperture, make the antenna main beam narrower, and improve the angular resolution capability. At the same time, there are multiple TX-RX reflection paths, which to a certain extent improves the interference factor of the target echo amplitude fluctuation. At the same time, the different orientations of the transmitting antenna can realize the function of synchronous detection in the horizontal and vertical directions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The present invention provides a schematic diagram of a vehicle anti-collision radar array antenna according to a specific embodiment of the present invention.

[0019] Figure 2 The present invention provides a circuit schematic diagram of a six-element uniform-amplitude slotted angle-cut linear array antenna in a vehicle anti-collision radar array antenna provided by a specific embodiment of the present invention.

[0020] Figure 3 The present invention provides a circuit layout of a slotted corner antenna unit in an automotive anti-collision radar array antenna provided by a specific embodiment of the present invention.

[0021] Figure 4 The present invention provides a circuit schematic diagram of a transmission power division matching network in a vehicle anti-collision radar array antenna according to a specific embodiment of the present invention.

[0022] Figure 5 It is a layout diagram of an overall circuit arrangement mode 1 of an automobile anti-collision radar array antenna provided by a specific embodiment of the present invention.

[0023] Figure 6 It is a layout diagram of a second overall circuit arrangement mode of an automobile anti-collision radar array antenna provided by a specific embodiment of the present invention. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without any creative work are within the scope of protection of the present invention.

[0025] The present embodiment provides an automotive anti-collision radar array antenna, including a four-transmit four-receive radar chip 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. Figure 1 shown.

[0026] like Figure 1 , Figure 5 and Figure 6 As shown, the first to fourth input ends of the millimeter-wave radar chip interface are respectively connected to 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 of equal length; the first to fourth output ends of the millimeter-wave radar chip interface are connected to 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 through four 50-ohm microstrip lines of equal length.

[0027] like Figure 5 and Figure 6 As shown, 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 composed of a six-element equal-amplitude slotted angle-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 to the input end of a transmitting power division matching network, wherein the first to fourth output ends of each transmitting power division matching network are respectively connected to four six-element equal-amplitude slotted angle-cut linear array antennas, and the spacing between the six-element equal-amplitude slotted angle-cut linear array antennas is 0.5λ mm, where λ is an electromagnetic wavelength of an operating frequency.

[0028] like Figure 2 and Figure 3 As shown, the six-element equal-amplitude slotted corner-cut linear array antenna is composed of six slotted corner-cut antenna units connected in series in sequence; the input end of the slotted corner-cut antenna unit is connected to a feeder line TLn with a width of W0 mm and a length of L0 mm, the other end of the feeder line TLn is connected to a patch antenna with a width of W mm and a length of L mm, and the other end of the patch antenna is connected to the output end of the slotted corner-cut antenna unit; the patch antenna also has a 45° cut angle, and a slot with a width of W1 mm ​​and a length of L1 mm is reserved at the feeding end, a T-shaped slot with a width of W2 mm and a length of L2 mm, and a T-shaped slot with a width of W3 mm and a length of L3 mm is reserved at the center position, and the length of the slot center from the patch antenna boundary is L4 mm, wherein n=1, 2, 3…6.

[0029] like Figure 4As shown, the input end of the transmitting power division matching network is connected to the microstrip line TL7, the other end of TL7 is simultaneously connected to the microstrip lines TL8 and TL13, the other end of the microstrip line TL8 is simultaneously connected to the microstrip lines TL9 and TL10, and the other end of TL9 is connected to the third output end of the transmitting power division matching network; the other end of the microstrip line TL10 is sequentially connected in series with the microstrip lines TL11 and TL12, and the other end of TL12 is connected to the fourth output end of the transmitting power division matching network; the other end of the microstrip line TL13 is simultaneously connected to the microstrip lines TL14 and TL15, and the other end of TL14 is connected to the second output end of the transmitting power division matching network; the other end of the microstrip line TL15 is sequentially connected in series with the microstrip lines TL16 and TL17, and the other end of TL17 is connected to the 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.

[0030] like Figure 5 and Figure 6 As shown, there are two modes for the layout of each antenna in the automotive anti-collision radar array antenna. In the two arrangement 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 directly below the four-transmit four-receive radar chip pad, and are arranged in sequence from left to right, pointing downward, and their horizontal spacing is 0.5λ mm; in arrangement mode one, 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 arranged on the left side, upper left side, upper right side, and right side of the four-transmit four-receive radar chip pad, and they point to the left, upper, upper, and right respectively; in arrangement mode two, 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 arranged on the left side, upper left side, upper right side, and right side of the four-transmit four-receive radar chip pad, and they point to the left, left, right, and right respectively.

[0031] The above is a detailed introduction to an automotive anti-collision radar array antenna provided by an embodiment of the present invention. This article uses specific examples to illustrate the technical solution of the present invention. The above embodiments are only preferred embodiments of the invention and are not intended to limit the protection scope of the present invention. For a person skilled in the art, any changes or improvements that can be thought of within the technical scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A car anti-collision radar array antenna, characterized in that: It includes a four-transmit four-receive radar chip 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 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 composed of a six-element equal-amplitude slotted angle-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 to the input end of a transmitting power division matching network, wherein the first to fourth output ends of each transmitting power division matching network are respectively connected to four six-element equal-amplitude slotted angle-cut linear array antennas, and the spacing between the six-element equal-amplitude slotted angle-cut linear array antennas is 0.5λ mm, where λ is an electromagnetic wavelength of an operating frequency point; The six-element uniform-amplitude slotted corner-cut linear array antenna is composed of six slotted corner-cut antenna units connected in series in sequence; the input end of the slotted corner-cut antenna unit is connected to a feeder line TLn with a width of W0 mm and a length of L0 mm, the other end of the feeder line TLn is connected to a patch antenna with a width of W mm and a length of L mm, and the other end of the patch antenna is connected to the output end of the slotted corner-cut antenna unit; The patch antenna also has a 45° cut angle, and a slot with a width of W1 mm ​​and a length of L1 mm is reserved at the feeding end, a T-shaped slot with a width of W2 mm and a length of L2 mm is reserved at the center, and a T-shaped slot with a width of W3 mm and a length of L3 mm is reserved. The length of the slot center from the patch antenna boundary is L4 mm, where n = 1, 2, 3…6; There are two modes for layout arrangement of each antenna in the automobile anti-collision radar array antenna. In the two arrangement 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 directly below the chip pad of the four-transmit four-receive radar, and are arranged in sequence from left to right, pointing downward, and the horizontal spacing is 0.5λ mm; in arrangement mode one, 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 arranged on the left side, the upper left side, the upper right side, and the right side of the chip pad of the four-transmit four-receive radar, and their directions are left, upper, upper, and right respectively; in arrangement mode two, 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 arranged on the left side, the upper left side, the upper right side, and the right side of the chip pad of the four-transmit four-receive radar, and their directions are left, left, right, and right respectively.

2. The vehicle anti-collision radar array antenna according to claim 1, characterized in that: The first to fourth input ends of the millimeter-wave radar chip interface 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 of equal length; the first to fourth output ends of the millimeter-wave radar chip interface are connected to 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 through four 50-ohm microstrip lines of equal length.

3. The vehicle anti-collision radar array antenna according to claim 1, characterized in that: The input end of the transmitting power division matching network is connected to the microstrip line TL7, the other end of TL7 is simultaneously connected to the microstrip lines TL8 and TL13, the other end of the microstrip line TL8 is simultaneously connected to the microstrip lines TL9 and TL10, and the other end of TL9 is connected to the third output end of the transmitting power division matching network; the other end of the microstrip line TL10 is sequentially connected in series with the microstrip lines TL11 and TL12, and the other end of TL12 is connected to the fourth output end of the transmitting power division matching network; the other end of the microstrip line TL13 is simultaneously connected to the microstrip lines TL14 and TL15, and the other end of TL14 is connected to the second output end of the transmitting power division matching network; the other end of the microstrip line TL15 is sequentially connected in series with the microstrip lines TL16 and TL17, and the other end of TL17 is connected to the 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 arranged and distributed sequentially from left to right.

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