A probe array antenna

Abstract

The application belongs to the technical field of antennas and relates to a detection array antenna, which comprises a plurality of transmitting antenna subarrays and a plurality of receiving antenna subarrays, the plurality of transmitting antenna subarrays are arranged at intervals and form a U-shaped detection array, the plurality of receiving antenna subarrays are divided into two equal groups and are arranged at intervals at two ends of the U-shaped structure respectively, the transmitting antenna subarray comprises 2 rows and 2 columns of antenna units, the receiving antenna subarray comprises 2 rows and 1 column of antenna units, the number of the transmitting antenna subarrays is 8, the number of the receiving antenna subarrays is 4, the U-shaped structure comprises one bottom side and two side sides, four transmitting antenna subarrays are arranged on the bottom side, and three transmitting antenna subarrays are arranged on each side side so that two transmitting antenna subarrays are arranged on the bottom side and the side sides of the U-shaped structure simultaneously. The application can reduce the antenna profile and improve the detection precision.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of antennas, in particular to a detection array antenna. BACKGROUND

[0002] By virtue of the advantages of miniaturization and free movement in three-dimensional space of the unmanned aerial vehicle, the wall-penetrating radar detection antenna and the unmanned aerial vehicle are conformally assembled, so that a larger range of detection can be achieved, and the detection array antenna has wide application scenarios in fields such as earthquake relief, underground exploration, road maintenance and detection of the degree of internal blockage of oil wells.

[0003] The detection system of a conventional unmanned aerial vehicle adopts a camera combined with an infrared probe for detection, but the infrared rays cannot effectively penetrate walls due to the weak penetrating power of the infrared rays. In addition, some portable handheld wall-penetrating radar devices can also be used, but the antenna of the portable handheld wall-penetrating radar device has the problems of large size and high profile, which greatly affects the aerodynamics and structural strength of the unmanned aerial vehicle, and cannot be conformally assembled to the unmanned aerial vehicle.

[0004] Limited by the size and aerodynamic requirements of the unmanned aerial vehicle, the wall-penetrating radar detection antenna conformally assembled to the unmanned aerial vehicle needs to have the characteristic of low profile. However, the antennas on the current unmanned aerial vehicles are mostly spiral antennas applied to communication, Wi-Fi antennas used for information transmission between the unmanned aerial vehicle and the remote controller, GPS antennas or Beidou antennas used for positioning and navigation, and have high profiles and low detection accuracy, which are difficult to meet the requirements of the wall-penetrating radar detection antenna. SUMMARY

[0005] Therefore, it is necessary to provide a detection array antenna capable of reducing the profile of the antenna and improving the detection accuracy in view of the above technical problems.

[0006] A detection array antenna comprises a plurality of transmitting antenna subarrays and a plurality of receiving antenna subarrays.

[0007] The plurality of transmitting antenna subarrays are arranged at intervals and form a detection array in the shape of a "U".

[0008] The plurality of receiving antenna subarrays are divided into two equal groups and are arranged at intervals at two ends of the "U" shape.

[0009] In one embodiment, the transmitting antenna subarray comprises 2 rows and 2 columns of antenna units, and the receiving antenna subarray comprises 2 rows and 1 column of antenna units.

[0010] In one embodiment, the number of the transmitting antenna subarrays is 8, and the number of the receiving antenna subarrays is 4.

[0011] In one embodiment, the "U" shape comprises one bottom side and two side sides.

[0012] The bottom edge is provided with four transmitting antenna sub-arrays, and each side edge is provided with three transmitting antenna sub-arrays, so that two transmitting antenna sub-arrays are simultaneously arranged on the bottom edge and the side edge of the U-shaped structure.

[0013] In one embodiment, the distance between the two groups of receiving antenna sub-arrays is less than the distance between the two side edges of the U-shaped structure.

[0014] In one embodiment, the transmitting antenna sub-arrays and the receiving antenna sub-arrays each comprise, from top to bottom, a radiation layer, a first dielectric layer, a ground layer, a second dielectric layer, and a feeding layer.

[0015] In one embodiment, the radiation layer of the transmitting antenna sub-array comprises four rectangular radiation patches, and the radiation layer of the receiving antenna sub-array comprises two rectangular radiation patches.

[0016] Two grooves recessed towards the other long edge are symmetrically arranged on one long edge of the radiation patch as first grooves.

[0017] Two grooves recessed towards one long edge are symmetrically arranged on the other long edge of the radiation patch as second grooves.

[0018] The width of the first grooves is equal to the length of the second grooves, and the length of the second grooves is 3 times the width of the second grooves.

[0019] In one embodiment, a third groove is arranged at the center of the short edge of the radiation patch, and a fourth groove is arranged on one long edge of the first grooves.

[0020] The length of the third groove is equal to the length of the fourth groove, the width ratio is 1:2, and the width of the fourth groove is equal to the width of the second grooves.

[0021] In one embodiment, the feeding layer of the transmitting antenna sub-array comprises three one-to-two power dividers, and the output ends of the power dividers are respectively connected to one radiation patch of the transmitting antenna sub-array.

[0022] The feeding layer of the receiving antenna sub-array comprises one one-to-two power divider, and the output end of the power divider is respectively connected to one radiation patch of the receiving antenna sub-array.

[0023] In one embodiment, a photoelectric ball and / or a camera are arranged at the middle position of the U-shaped structure to realize combined detection.

[0024] The probe array antenna has the characteristics of super wide band, low profile, stable main beam radiation direction, narrow beam of transmitting antenna, wide beam of receiving antenna, can realize airborne wall penetration detection, can be conformally assembled to the unmanned aerial vehicle landing gear, does not affect the aerodynamic characteristics and structural strength of the unmanned aerial vehicle, has wide application prospect, for example: can be used for detecting personnel trapped in ruins during earthquake relief; can detect deep underground information during underground exploration and road maintenance; can detect the degree of obstruction in the oil well when detecting the inside of the oil well, can reduce the danger of manual operation. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of a probe array antenna in an embodiment;

[0026] Figure 2 It is a design architecture diagram of a probe array antenna in an embodiment;

[0027] Figure 3 It is a structural exploded schematic diagram of a transmitting antenna subarray of a probe array antenna in an embodiment;

[0028] Figure 4 It is a top view of a transmitting antenna subarray of a probe array antenna in an embodiment;

[0029] Figure 5 It is a bottom view of a transmitting antenna subarray of a probe array antenna in an embodiment;

[0030] Figure 6 It is a structural exploded schematic diagram of a receiving antenna subarray of a probe array antenna in an embodiment;

[0031] Figure 7 It is a top view of a receiving antenna subarray of a probe array antenna in an embodiment;

[0032] Figure 8 It is a bottom view of a receiving antenna subarray of a probe array antenna in an embodiment;

[0033] Figure 9 It is a structural schematic diagram of a radiation patch of a probe array antenna in an embodiment;

[0034] Figure 10 It is a schematic diagram of a fixing plate of a probe array antenna in an embodiment;

[0035] Figure 11 It is a size schematic diagram of a radiation patch of a probe array antenna in an embodiment;

[0036] Figure 12 It is an S11 curve diagram of a microstrip patch antenna in an embodiment;

[0037] Figure 13 S11 curve of the transmit antenna subarray and the receive antenna subarray in one embodiment;

[0038] Figure 14 3dB beamwidth effect diagram of the azimuth and elevation of the transmit antenna in one embodiment;

[0039] Figure 15 3dB beamwidth effect diagram of the azimuth and elevation of the receive antenna in one embodiment;

[0040] Figure 16 Main beam deflection angle effect diagram of the transmit antenna in one embodiment;

[0041] Figure 17 Main beam deflection angle effect diagram of the receive antenna in one embodiment;

[0042] Figure 18 Side lobe level effect diagram of the transmit antenna in one embodiment;

[0043] Figure 19 Side lobe level effect diagram of the receive antenna in one embodiment.

[0044] Reference signs:

[0045] Receive antenna A, bottom transmit antenna B, left transmit antenna C, right transmit antenna D;

[0046] Radiation layer 1, first dielectric plate 2, second dielectric plate 3, third dielectric plate 4, ground layer 5, fourth dielectric plate 6, fifth dielectric plate 7, metal probe 8, feed layer 9;

[0047] Quarter wavelength impedance transformer 10, fixed hole 11, square hole 12;

[0048] First groove E1, second groove E2, third groove E3, fourth groove E4. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0050] It should be noted that all directional indications, such as upper, lower, left, right, front, back, and the like, are merely used for convenience of description and are not intended to limit the application to any particular orientation.

[0051] In addition, the terms "first", "second", and the like, used in the description of the present application are only intended to describe and are not to be understood as indicating or implying that the relative importance or the number of the technical features indicated. Therefore, the features defined as "first" and "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of groups" is at least two groups, such as two groups, three groups, etc., unless otherwise specifically limited.

[0052] In the present application, unless otherwise specifically defined and limited, the terms "connection", "fixing", and the like, should be broadly understood, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or physical connection, or wireless communication connection; can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements, or interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In addition, the technical solutions of various embodiments of the present application can be combined with each other, but it must be based on the fact that those skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection claimed in the present application.

[0054] The present application provides a detection array antenna, as shown in one embodiment, comprising: a transmitting antenna and a receiving antenna, the transmitting antenna comprising a plurality of transmitting antenna subarrays, the receiving antenna comprising a plurality of receiving antenna subarrays, the plurality of transmitting antenna subarrays and the plurality of receiving antenna subarrays being arranged on a plane. Figures 1 to 9

[0055] The plurality of transmitting antenna subarrays are uniformly spaced and form a "U" shaped detection array.

[0056] The plurality of receiving antenna subarrays are divided into two equal groups, respectively, and are spaced apart from the two ends of the "U" shaped structure, and the whole antenna forms a "U" shaped MIMO array antenna.

[0057] ​In this embodiment, the subarray form is used, the transmitting antenna subarray and the receiving antenna subarray are partitioned according to the direction (bottom and side), and are separately operated in time to have higher detection resolution in the azimuth direction and the elevation direction, avoid the side lobe rising or the grating lobe, improve the detection accuracy, and realize the precise through-wall detection three-dimensional imaging.

[0058] Preferably, the transmitting antenna subarray includes 2 rows and 2 columns of antenna units (i.e., 2*2 transmitting antenna subarray) to realize the narrow beam of the transmitting antenna and expand the occupied area under the condition of the same number of units to obtain the 3dB beam width of the azimuth direction and the elevation direction; the receiving antenna subarray includes 2 rows and 1 column of antenna units (i.e., 2*1 receiving antenna subarray) to realize the wide beam of the receiving antenna and realize the directivity and stability of the main beam radiation direction of the receiving antenna.

[0059] Further preferably, the number of the transmitting antenna subarrays is 8, and the number of the receiving antenna subarrays is 4 to make the antenna have better characteristics of the narrow beam of the transmitting antenna and the wide beam of the receiving antenna, and further improve the signal transmission rate and the detection positioning accuracy of the through-wall radar detection.

[0060] Still further preferably, the "U" shaped structure includes one bottom side and two side sides; the bottom side is provided with 4 transmitting antenna subarrays, and each side side is provided with 3 transmitting antenna subarrays to make 2 transmitting antenna subarrays be arranged on the bottom side and the side side of the "U" shaped structure. Under the above arrangement, the 4 receiving antenna subarrays on the top form the receiving antenna to realize the wide beam; the 4 transmitting antenna subarrays on the bottom form the bottom transmitting antenna to realize the narrow beam and the high resolution in the azimuth direction; the 3 transmitting antenna subarrays on the left side and the 3 transmitting antenna subarrays on the right side form the left transmitting antenna and the right transmitting antenna respectively to realize the narrow beam and the high resolution in the elevation direction.

[0061] Still further preferably, the distance between the two groups of receiving antenna subarrays is less than the distance between the two side sides of the "U" shaped structure to improve the signal strength of the reflected signal of the target object to the receiving antenna and reduce the overall size of the antenna.

[0062] In another embodiment, the transmitting antenna subarray and the receiving antenna subarray each include, from top to bottom, a radiation layer, a first dielectric layer, a ground layer, a second dielectric layer, and a feeding layer, wherein the first dielectric layer includes a first dielectric plate, a second dielectric plate, and a third dielectric plate, and the second dielectric layer includes a fourth dielectric plate and a fifth dielectric plate, that is, the transmitting antenna subarray and the receiving antenna subarray each include, from top to bottom, a radiation layer (metal material), a first dielectric plate (such as F4B material), a second dielectric plate (such as foam material), a third dielectric plate (such as F4B material), a ground layer (metal material), a fourth dielectric plate (such as Rogers 4450B material), a fifth dielectric plate (such as F4B material), and a feeding layer (metal material), to realize a planar microstrip patch antenna, achieve low profile and low cost, and avoid electromagnetic interference on radio frequency circuits by reflecting back radiation. In addition, the coupling effect between layers is used to expand the bandwidth of the antenna, further improve the signal transmission rate and positioning accuracy of the through-wall radar detection.

[0063] The radiation layer of the transmitting antenna subarray includes four rectangular radiation patches, and the radiation layer of the receiving antenna subarray includes two rectangular radiation patches.

[0064] The feeding layer of the transmitting antenna subarray is designed with a T-shaped power division matching network including three 1:2 power dividers (the power dividers include microstrip line segments and quarter-wave impedance transformers), and the output ends of the power dividers are respectively connected to one radiation patch of the transmitting antenna subarray through metal probes. The feeding layer of the receiving antenna subarray includes a 1:2 power divider, and the output ends of the power divider are respectively connected to one radiation patch of the receiving antenna subarray through metal probes. The above arrangement can transmit the radio frequency signal input by the SMA interface to the radiation layer through the microstrip line and the metal probe, realize the connection between the SMA port and the metal probe, and achieve impedance matching of different microstrip line segments through the quarter-wave impedance transformers, thereby expanding the relative bandwidth of the transmitting antenna subarray and the receiving antenna subarray.

[0065] Preferably, two grooves recessed towards the other long side are symmetrically arranged on one long side of the radiation patch as first grooves, so that the radiation patch forms an "E" shape structure; two grooves recessed towards one long side are symmetrically arranged on the other long side of the radiation patch as second grooves; the first grooves and the second grooves are rectangular grooves, the width of the first grooves is equal to the length of the second grooves, and the length of the second grooves is 3 times the width of the second grooves. The above arrangement can produce different resonance points corresponding to different resonance frequencies. When these resonance points are close to each other, the resonance frequency range expands, the frequency band of the antenna is expanded, the relative bandwidth is improved, and ultra-wideband is realized.

[0066] Further preferably, a third groove is arranged at the center of the short side of the radiation patch, and a fourth groove is arranged on one long side of the first groove; the third groove and the fourth groove are rectangular grooves, the length of the third groove is equal to the length of the fourth groove, the width ratio of the third groove to the fourth groove is 1:2, and the width of the fourth groove is equal to the width of the second groove. The above arrangement can change the surface current distribution of the microstrip patch antenna, further expand the bandwidth of the antenna, and further realize ultra-wideband.

[0067] In another embodiment, the middle position of the "U" shaped structure is provided with a photoelectric ball (receiving infrared signals to assist antenna imaging) and / or a camera to realize combined detection.

[0068] The above detection array antenna has the characteristics of ultra-wideband, low profile, stable main beam radiation direction, narrow beam of transmitting antenna, and wide beam of receiving antenna, can realize airborne wall-penetrating detection, and can be conformally assembled to the unmanned aerial vehicle landing gear without affecting the aerodynamic characteristics and structural strength of the unmanned aerial vehicle, and has a broad application prospect. For example, in earthquake relief, it can be used to detect personnel trapped in ruins; in underground exploration and road maintenance, it can detect deep underground information; in oil well internal detection, it can detect the degree of obstruction in the oil well, and can reduce the danger of manual operation.

[0069] In a specific embodiment, the antenna is composed of 8 2*2 transmitting antenna subarrays and 4 2*1 receiving antenna subarrays, and M3 fixing holes are opened in the four corners of the transmitting antenna subarrays and the receiving antenna subarrays for fixing the multi-layer board.

[0070] As shown in Figure 10 , the antenna fixing plate adopts a 1mm thick acrylic plate, 12 square holes and 113 M3 fixing holes are opened on the antenna fixing plate, the square holes are spaces for assembling SMA interfaces of the transmitting antenna subarrays and the receiving antenna subarrays, a part of the M3 fixing holes are used to connect and fix the dispersed transmitting antenna subarrays and the receiving antenna subarrays with the antenna fixing plate through screws and nuts, and the other part of the M3 fixing holes are used to fix the antenna fixing plate with the unmanned aerial vehicle landing gear through screws and nuts, realizing conformal assembly of the MIMO array antenna to the unmanned aerial vehicle landing gear.

[0071] The size of the antenna is 595.5mm in length, 460mm in width, and 9.6mm in thickness, and a space of 230mm*350mm is left in the middle part of the "U" shaped structure to place the photoelectric ball and / or the camera, forming a combined detection system. The spacing between the transmitting antenna subarrays is 12mm to leave space for welding the SMA radio frequency input port, and at the same time, to avoid the rise of sidelobe level due to too large spacing. The size of the radiation patch is as shown in Figure 11The first, third and fifth dielectric plates are made of F4B material, with a relative dielectric constant of 2.65, a dielectric loss tangent of 0.001 and a thickness of 1.5 mm; the second dielectric plate is made of foam material, with a relative dielectric constant of 1.06 and a thickness of 4 mm; the fourth dielectric plate is made of Rogers 4450B material, with a relative dielectric constant of 3.48, a dielectric loss tangent of 0.037 and a thickness of 0.101 mm; the metal probe has a radius of 0.4 mm, is connected to the microstrip line of the feed layer and the radiation patch of the radiation layer, and is isolated from the ground layer (how to isolate is prior art).

[0072] As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots. Figure 12 As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots.

[0073] As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots. Figure 13 As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots.

[0074] As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots. Figure 14 As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots.

[0075] As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots. Figure 15 As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots.

[0076] As shown in FIG. 6, the microstrip patch antenna has only one resonant frequency of 3.02 GHz without the slot, has two resonant frequencies of 2.7 GHz and 3.13 GHz with only the first slot, and also has two resonant frequencies of 2.68 GHz and 3.17 GHz with the first to fourth slots. Figure 16As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction.

[0077] As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction. Figure 17 As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction.

[0078] Figure 18 As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction.

[0079] As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction. Figure 19 As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction.

[0080] As shown in FIG. 1, the bottom transmitting antenna composed of the four transmitting antenna subarrays at the bottom of the antenna has a main beam deflection angle of no more than 3 degrees in the azimuth direction, and the left transmitting antenna composed of the three transmitting antenna subarrays at the left of the antenna and the right transmitting antenna composed of the three transmitting antenna subarrays at the right of the antenna have a main beam deflection angle of no more than 3 degrees in the elevation direction.

[0081] The contents not described in detail in the specification belong to the prior art known by the person skilled in the art.

[0082] The technical features of the above embodiments can be combined arbitrarily, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not contradict, they should be considered as the scope of the present application.

[0083] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as the limitation on the scope of the present application. It should be pointed out that for the person skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.​

Claims

1. A detection array antenna, characterized in that: include: multiple transmit antenna subarrays and multiple receive antenna subarrays; Multiple transmitting antenna sub-arrays are arranged at intervals to form a "U"-shaped detection array; The multiple receiving antenna sub-arrays are divided into two equal groups and are spaced apart from the two ends of the "U"-shaped structure; The "U"-shaped structure includes a bottom edge and two side edges; The distance between the two groups of receiving antenna subarrays is smaller than the distance between the two sides of the "U"-shaped structure.

2. The detection array antenna according to claim 1, characterized in that: The transmitting antenna subarray includes antenna units in 2 rows and 2 columns, and the receiving antenna subarray includes antenna units in 2 rows and 1 column.

3. The detection array antenna according to claim 2, characterized in that: The number of the transmitting antenna subarrays is 8, and the number of the receiving antenna subarrays is 4.

4. The detection array antenna according to claim 3, characterized in that: Four transmitting antenna subarrays are provided on the bottom edge, and three transmitting antenna subarrays are provided on each side edge, so that two transmitting antenna subarrays are provided on both the bottom edge and the side edge of the "U"-shaped structure.

5. The detection array antenna according to any one of claims 1 to 4, characterized in that: The transmitting antenna subarray and the receiving antenna subarray both include: a radiation layer, a first dielectric layer, a floor layer, a second dielectric layer, and a feed layer stacked in sequence from top to bottom.

6. The detection array antenna according to claim 5, characterized in that: The radiation layer of the transmitting antenna subarray includes: four rectangular radiation patches; the radiation layer of the receiving antenna subarray includes: two rectangular radiation patches; Two grooves are symmetrically provided on one long side of the radiation patch and are recessed toward the other long side, serving as first grooves; Two grooves are symmetrically provided on the other long side of the radiation patch and are recessed toward one long side to serve as second grooves; The width of the first groove is equal to the length of the second groove, and the length of the second groove is 3 times the width of the second groove.

7. The detection array antenna according to claim 6, characterized in that: A third groove is provided at the center of the short side of the radiation patch, and a fourth groove is provided on one long side of the first groove; The lengths of the third groove and the fourth groove are equal, the ratio of their widths is 1:2, and the width of the fourth groove is equal to that of the second groove.

8. The detection array antenna according to claim 7, characterized in that: The feed layer of the transmitting antenna subarray includes: three one-to-two power splitters, the output ends of the power splitters are respectively connected to a radiation patch of the transmitting antenna subarray; The feeding layer of the receiving antenna subarray includes: a one-to-two power divider, and the output ends of the power divider are respectively connected to a radiation patch of the receiving antenna subarray.

9. The detection array antenna according to any one of claims 1 to 4, characterized in that: A photoelectric ball and / or camera is provided in the middle of the "U"-shaped structure to achieve combined detection.

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