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EP-4109675-B1 - ANTENNA STRUCTURE, RADAR AND TERMINAL

EP4109675B1EP 4109675 B1EP4109675 B1EP 4109675B1EP-4109675-B1

Inventors

  • HE, Yin
  • GAO, XIANG
  • LI, Haowei
  • LIU, Yiting

Dates

Publication Date
20260506
Application Date
20200318

Claims (15)

  1. An antenna structure (100), wherein the antenna structure comprises a main feeder (110) and a plurality of patch unit groups (121-12N) connected in series to the main feeder in a length direction of the main feeder; and each patch unit group consists of two patch units (131, 132, 133, 134) disposed in a V-shaped structure, and each patch unit group is connected in series to the main feeder through the two patch units that are disposed in the V-shaped structure and that are in each patch unit group; characterized in that all the patch units in the each patch unit group are located on the same side of the main feeder.
  2. The antenna structure (100) according to claim 1, wherein each patch unit group (121-12N) is connected in series to the main feeder (110) through a connection point of the two patch units (131, 132, 133, 134) that are disposed in the V-shaped structure and that are in each patch unit group.
  3. The antenna structure according to claim 1 or 2, wherein a polarization direction of each patch unit group is a horizontal polarization direction.
  4. The antenna structure (100) according to any one of claims 1 to 3, wherein the plurality of patch unit groups are connected in series to two sides of the main feeder (110).
  5. The antenna structure (100) according to claim 4, wherein the plurality of patch unit groups (121-12N) are alternately connected in series to the two sides of the main feeder (110).
  6. The antenna structure (100) according to any one of claims 1 to 5, wherein: a width of a patch unit in the plurality of patch unit groups (121-12N) first increases and then decreases in a first direction; or a width of a patch unit in the plurality of patch unit groups increases in a first direction; or a width of a patch unit in the plurality of patch unit groups decreases in a first direction.
  7. The antenna structure (100) according to any one of claims 1 to 6, wherein the antenna structure is a receive antenna or a transmit antenna.
  8. A radar (200), comprising the antenna structure (100) according to any one of claims 1 to 7.
  9. The radar (200) according to claim 8, wherein the radar further comprises a control chip (150), the control chip is connected to a second end of the antenna structure (100), and the control chip is configured to control the antenna structure to transmit or receive a signal.
  10. The radar (200) according to claim 9, wherein the radar further comprises an impedance matching unit (160), the impedance matching unit is configured to match impedance of the second end with impedance of the control chip (150), and the control chip is connected to the second end through the impedance matching unit.
  11. The radar (200) according to any one of claims 8 to 10, wherein the radar further comprises a printed circuit board (170), the printed circuit board comprises the antenna structure (100), a dielectric layer (171), and a metal layer (172) that are sequentially disposed in a stacked manner, and the antenna structure is grounded through the metal layer.
  12. A terminal (300), wherein the terminal comprises the radar (200) according to any one of claims 8 to 11.
  13. The terminal (300) according to claim 12, wherein the terminal is a vehicle.
  14. A method (400) for producing an antenna apparatus, comprising: etching (S410) an antenna structure (100) on a first metal layer, wherein the antenna structure comprises a main feeder (110) and a plurality of patch unit groups (121-12N), and each patch unit group is connected in series to the main feeder in a length direction of the main feeder; and each patch unit group consists of two patch units (131, 132, 133, 134) disposed in a V-shaped structure, and each patch unit group is connected in series to the main feeder through the two patch units that are disposed in the V-shaped structure and that are in each patch unit group; bonding (S420) a first surface of the antenna structure and a first surface of a dielectric layer (171) together; and bonding (S430) a second surface of the dielectric layer and a first surface of a second metal layer (172) together, wherein the first surface of the dielectric layer is disposed opposite to the second surface of the dielectric layer, and the antenna structure is grounded through the second metal layer; characterized in that all the patch units in the each patch unit group are located on the same side of the main feeder.
  15. The method (400) according to claim 14, wherein each patch unit group (121-12N) is connected in series to the main feeder (110) through a connection point of the two patch units (131, 132, 133, 134) that are disposed in the V-shaped structure and that are in each patch unit group.

Description

TECHNICAL FIELD This application relates to the field of sensor technologies, and more specifically, to an antenna structure, a radar, and a terminal in the field of sensor technologies. BACKGROUND With development of society and progress of science and technology, intelligent vehicles gradually enter people's daily lives. A sensor plays a very important role in unmanned driving and intelligent driving of an intelligent vehicle. The sensor may be a millimeter-wave radar, a laser radar, an ultrasonic radar, a camera, or the like. For example, as a key sensor of the unmanned driving technology, a 77 GHz millimeter-wave radar has features such as a short wavelength and a small device size. The 77 GHz millimeter-wave radar has irreplaceable advantages in terms of detection precision, detection distance, and device integration. From perspectives of a detection scenario and an implementation function of the radar, an antenna used by the radar is required to have a wide 3 dB beam bandwidth and a low sidelobe. The wide 3 dB beam bandwidth can ensure a large detection angle range in a horizontal direction, and the low sidelobe can reduce clutter energy reflected by the ground in a vertical direction. Consequently, a false alarm probability is reduced. FIG. 1 is a schematic diagram of a structure of an existing antenna structure. The existing antenna structure uses a series-feed mode, that is, a plurality of radiation patches that are vertically connected to a feeder are simultaneously excited by using one feeder. Widths of the plurality of radiation patches first gradually increase and then gradually decrease in a length direction of the feeder, that is, energy radiated by the antenna structure is concentrated in a middle area close to a length of the feeder, so that low sidelobe weighting can be implemented. This avoids radar false alarm. However, the existing antenna structure shown in FIG. 1 may implement a low sidelobe level, but has a small 3 dB beam width. This leads to a small detection angle range in the horizontal direction. US 2015/318621 describes a dielectric travelling wave antenna (DTWA) using a TEM mode transmission line and variable dielectric substrate. US 2009/058741 describes an antenna system that includes a substantially straight microstrip segment and a plurality of substantially straight microstrip projections. The plurality of microstrip projections extend from the microstrip segment in pairs at a predetermined angle, wherein each microstrip projection of the pair of microstrip projections extends from substantially the same location on the microstrip segment. US 2014/078006 describes an antenna that includes: a dielectric substrate; a feed line for feeding RF signals that is formed on an upper portion of the dielectric substrate and has a linear form; a multiple number of radiators that are perpendicularly joined to the feed line and have a bent structure comprising a horizontal portion and a vertical portion; a matching element for adjusting impedance matching that is joined to an end of the feed line; and a ground formed on a lower portion of the dielectric substrate, where a length of the horizontal portion and the vertical portion is set based on a polarization angle of an RF signal that is to be radiated. US 2014/054383 describes a near field antenna that includes: a ground electrode arranged on a lower surface of a first dielectric layer; a conductor which is arranged between the first dielectric layer and a second dielectric layer, and forms a microstrip antenna with the ground electrode, one end of the conductor being connected to a power feeding port and the another end of the conductor being an open end; and at least one resonator arranged on an upper surface of the second dielectric layer, within a range in which the resonator is able to electromagnetically couple with the microstrip antenna for any of nodal points of a standing wave of current which flows through the microstrip antenna depending on an electric wave with a certain design wavelength, radiated from the microstrip antenna or received by the microstrip antenna. US 2006/049989 describes a printed antenna on a substrate for radiating and capturing radio frequency signals that includes a ground portion, a feeding element and a radiating portion. The radiating portion is a main body of the printed antenna, and includes a connecting patch and a radiating patch. One end of the connecting patch is electronically connected to the feeding element. The connecting patch is tapered, with a width thereof gradually decreasing in a direction toward the feeding element. The radiating patch is electronically connected to the connecting patch, and has an inverted V-shape. SUMMARY Embodiments of this application provide an antenna structure, a radar, and a terminal, to extend a 3 dB bandwidth of the antenna structure. According to a first aspect, an embodiment of this application provides an antenna structure. The antenna structure incl