77GHz wide-beam vehicle-mounted radar transmitting and receiving antenna array with surface wave suppression

Abstract

The invention discloses a 77GHz wide-beam vehicle-mounted radar transmitting and receiving antenna array for surface wave suppression. Wide-angle target detection generally cannot be realized by the azimuth plane beam width of a patch type series-fed millimeter wave vehicle-mounted radar antenna. According to the invention, the transversely placed trapezoidal patches are used as the antenna units, and the mushroom-shaped high-impedance surface is loaded around the antenna, so that the surface wave problem caused by horizontal polarization is suppressed. Wide-angle wave beams are achieved under the condition that only a single-layer board is used, and practical benefits are achieved for 77GHz vehicle-mounted millimeter wave radar receiving and transmitting antenna array design for achieving low-cost wide-angle detection.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted radar antennas, and particularly to a 77GHz wide-beam vehicle-mounted radar transceiver antenna array with surface wave suppression. Background Art

[0002] In the field of intelligent driving and advanced driver assistance systems (ADAS), the application of millimeter-wave radar technology is becoming increasingly widespread. Especially for 77GHz band radars, due to their high resolution and low interference characteristics, they have been emphasized in vehicle environment perception. 77GHz vehicle-mounted radars can effectively provide detection data for medium and long distances, and are suitable for target detection and tracking in various complex traffic scenarios, such as forward collision warning, blind spot monitoring, and lane keeping assistance.

[0003] However, the traditional narrow-beam design is difficult to cover a large detection area around the vehicle, resulting in a perception blind spot, which is particularly disadvantageous in highway and dense traffic scenarios. Wide-beam antennas can significantly improve the radar's perception ability in complex environments due to their wider coverage angle. However, when designing a wide-beam antenna array in the 77GHz band, the presence of surface waves will cause problems such as reduced radiation efficiency, gain attenuation, and phase deviation, which not only affect the radar's detection performance but also increase the system's noise and interference.

[0004] To solve the above problems, surface wave suppression technology has become one of the important topics in millimeter-wave antenna design. By suppressing surface waves, the energy dissipation caused by surface waves can be effectively reduced, and the radiation efficiency and directivity of the antenna can be improved, thus ensuring the stability and reliability of the wide-beam design. This surface wave suppression technology is particularly important for vehicle-mounted radar antenna arrays, and can provide better wide-angle detection performance without increasing the system complexity, helping the vehicle to perform all-round environment perception in complex road conditions. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a 77GHz wide-beam vehicle-mounted radar transceiver antenna array with surface wave suppression.

[0006] The purpose of the present invention is achieved through the following content:

[0007] A 77GHz wide-beam vehicle-mounted radar transceiver antenna array with surface wave suppression, comprising a transceiver antenna array, a coplanar waveguide feeder, and a mushroom-shaped high-impedance surface;

[0008] Each antenna of the transceiver antenna array is composed of series-fed radiation units; the coplanar waveguide feeder includes a signal conductor, a top conductor, a slot, and a metallized via hole; the mushroom-shaped high-impedance surface is composed of periodic square patches and metal vias;

[0009] Furthermore, the transceiver antenna array, coplanar waveguide feeder, and mushroom-shaped high-impedance surface share a common metal floor;

[0010] Furthermore, the radiation element is a trapezoidal patch arranged horizontally;

[0011] Furthermore, the adjacent radiation elements are arranged in opposite directions;

[0012] Furthermore, one end of the coplanar waveguide feeder is connected to the excitation port, and the other end is connected to the horizontally arranged trapezoidal patch. The impedance of the coplanar waveguide feeder is 50 ohms;

[0013] Furthermore, the slot is located between the signal conductor and the top conductor. The metallized periodic vias are distributed along the edge of the top conductor on one side of the slot, and the metallized periodic vias connect the top conductor to the metal floor;

[0014] Furthermore, the mushroom-shaped high-impedance surface is located around four receiving antennas and two transmitting antennas. The metal via is located at the center of the periodic square patch, and the metal via connects the periodic square patch to the metal floor.

[0015] The 77GHz wide-beam vehicle-mounted radar transceiver antenna array for surface wave suppression provided by the present invention has the following beneficial effects:

[0016] 1. Effectively suppress surface waves and improve antenna radiation efficiency

[0017] By introducing a periodic electromagnetic bandgap structure into the antenna structure to implement surface wave suppression measures, the surface wave energy can be significantly reduced, the radiation efficiency of the main beam can be improved, and the sidelobe interference can be reduced.

[0018] 2. Optimize the wide-beam characteristics and enhance the vehicle target detection ability

[0019] The design adopts a specific antenna structure and array arrangement method, enabling the antenna to have a wide beam coverage range, improving the radar's detection ability for close-range and large-angle targets, and meeting the application requirements of vehicle-mounted millimeter-wave radars.

[0020] 3. Compact structure, suitable for vehicle-mounted integration

[0021] The single-layer board antenna structure design enables the antenna array to have a low volume and weight while ensuring good performance, facilitating installation in the limited space of the vehicle and improving the engineering applicability of the system. Brief Description of the Drawings

[0022] Figure 1 is a schematic diagram of the structure of a 77GHz wide-beam vehicle-mounted radar transceiver antenna array for surface wave suppression according to the present invention;

[0023] Figure 2It is the top view of the transceiver antenna array structure of the present invention;

[0024] Figure 3 It is the top view of the coplanar waveguide feeder structure of the present invention;

[0025] Figure 4 It is the top view of the mushroom-shaped high impedance surface structure of the present invention;

[0026] Figure 5 It is the top view of the metal floor structure of the present invention;

[0027] Figure 6 It is the elevation plane pattern of the embodiment of the present invention at 77 GHz;

[0028] Figure 7 It is the azimuth plane pattern of the embodiment of the present invention at 77 GHz;

[0029] Figure 8 It is the echo loss curve of the embodiment of the present invention. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the following further describes the present invention in detail with reference to specific embodiments and the attached Figure 1-8 ,.

[0031] As Figure 1-5 shown, a 77 GHz wide-beam vehicle-mounted radar transceiver antenna array designed for surface wave suppression includes a transceiver antenna array 1, a coplanar waveguide feeder 2, a mushroom-shaped high impedance surface 3, a metal floor 4, and a dielectric substrate 5.

[0032] The transceiver antenna array includes four receiving antennas 1A and two transmitting antennas 1B. Each antenna is composed of 11 radiation units 1C, and the radiation units are trapezoidal patches arranged horizontally.

[0033] The coplanar waveguide feeder includes a signal conductor 2A, a top conductor 2B, a slot 2C, and a metallized periodic via 2D.

[0034] Furthermore, the slot is located between the signal conductor and the top conductor, and the metallized periodic vias are distributed along the edge of the top conductor on one side of the slot.

[0035] The mushroom-shaped high impedance surface includes periodically distributed square patches 3A and metal vias 3B.

[0036] Specifically, the metal via is located at the center of the square patch.

[0037] Furthermore, the transceiver antenna array, the coplanar waveguide feeder, and the periodically distributed square patches are all printed on the upper surface of the dielectric substrate. The metal floor is printed on the lower surface of the dielectric substrate.

[0038] Further, the metallized periodic vias connect the top conductor to the metal floor.

[0039] Further, the metal vias connect the square patch to the metal floor.

[0040] Specifically, the dielectric substrate model is R04830, with a thickness of 0.127 mm, a length of 50 mm, and a width of 47 mm

[0041] Specifically, the dimensions of the trapezoidal patch are: the bottom base length is 1.07 mm, the top base length is 0.65 mm, and the height is 0.83 mm.

[0042] Specifically, the width of the signal body is 0.3 mm, and the width of the slot is 0.14 mm.

[0043] Specifically, the metallized periodic vias are circular, with a diameter of 0.3 mm, a period of 0.7 mm, and a distance of 0.15 mm from the edge of the slot.

[0044] Specifically, the side length of the periodically distributed square patches is 0.8 mm, the metal vias are circular, with a diameter of 0.2 mm, and a period of 0.92 mm.

[0045] Specifically, the distance between the mushroom-shaped high-impedance surface and the antenna is 0.52 mm.

[0046] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the present invention.

Claims

1. A 77GHz wide-beam vehicle-mounted radar transceiver antenna array with surface wave suppression, characterized in that, It includes four receiving antennas, two transmitting antennas, a coplanar waveguide feeder, and a mushroom-shaped high-impedance surface; the four receiving antennas, two transmitting antennas, coplanar waveguide feeder, and mushroom-shaped high-impedance surface share a metal floor.

2. The surface wave suppression 77GHz wide beam vehicle-mounted radar transceiver antenna array according to claim 1, characterized in that, Each of the four receiving antennas and two transmitting antennas is composed of series-fed radiation elements; the radiation elements are trapezoidal patches placed horizontally.

3. The 77GHz wide-beam vehicle-mounted radar transceiver antenna array with surface wave suppression according to claim 1, characterized in that, The coplanar waveguide feeder includes a signal conductor, a top conductor, a slot, and metallized periodic vias.

4. The surface wave suppression 77GHz wide beam vehicle-mounted radar transceiver antenna array according to claim 1, characterized in that, The mushroom-shaped high-impedance surface is composed of periodically distributed square patches and metal vias.

5. The surface wave suppression 77 GHz wide beam vehicle-mounted radar transceiver antenna array according to claim 2, characterized in that, In the series-fed radiation elements, adjacent radiation elements are placed in opposite directions.

6. The surface wave suppression 77GHz wide beam vehicle-mounted radar transceiver antenna array according to claim 3, characterized in that, The slot in the coplanar waveguide feeder is located between the signal conductor and the top conductor; the metallized periodic vias are distributed along the edge of the top conductor on one side of the slot; the metallized periodic vias connect the top conductor to the metal floor.

7. The surface wave suppression 77GHz wide beam vehicle-mounted radar transceiver antenna array according to claim 3, characterized in that One end of the coplanar waveguide feeder is connected to the excitation port, and the other end is connected to the horizontally placed trapezoidal patch; the impedance of the coplanar waveguide feeder is 50 ohms.

8. The surface wave suppression 77GHz wide beam vehicle-mounted radar transceiver antenna array according to claim 4, characterized in that, The mushroom-shaped high-impedance surface is located in the gap between the four receiving antennas and two transmitting antennas; the metal vias are located at the centers of the periodic square patches; the metal vias connect the periodic square patches to the metal floor.

Images