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EP-4343961-B1 - ANTENNA AND ELECTRONIC DEVICE

EP4343961B1EP 4343961 B1EP4343961 B1EP 4343961B1EP-4343961-B1

Inventors

  • GUAN, QIAO
  • WEI, Kunpeng
  • WANG, YI
  • HOU, Simin

Dates

Publication Date
20260506
Application Date
20220829

Claims (14)

  1. An antenna (10A, 1, 2), wherein the antenna (10A, 1, 2) is disposed in an electronic device (10, 100), the electronic device (10, 100) comprises a metal backplane (10E), and the antenna (10A, 1, 2) comprises a feed (12A) and a first resonant cavity (11A); and the feed (12A) is disposed in the first resonant cavity (11A) for feeding the antenna (10A, 1, 2); and the first resonant cavity (11A) comprises a first slot (11A1) and a second slot (11A2), the first slot (11A1) is provided on a first plane (11A3) in the first resonant cavity (11A); the second slot (11A2) is provided on a second plane (11A4) that is in the first resonant cavity (11A) and that is adjacent to the first plane (11A3), and the first plane (11A3) and the second plane (11A4) are perpendicular to a plane on which the metal backplane (10E) is located, characterized in that the first resonant cavity (11A) further comprises a third slot (11A5), the third slot (11A5) is provided on a third plane (11A6) in the first resonant cavity (11A), the third plane (11A6) is adjacent to the first plane (11A3) or the second plane (11A4), and the third plane (11A6) is perpendicular to the plane on which the metal backplane (10E) is located.
  2. The antenna (10A, 1, 2) according to claim 1, wherein the first resonant cavity (11A) is an L-shaped resonant cavity.
  3. The antenna (10A, 1, 2) according to claim 1 or 2, wherein the first resonant cavity (11A) is disposed at a location at which a first side (10F) and a second side (10G) of the electronic device (10, 100) intersect, a distance between the first plane (11A3) and the first side (10F) is the smallest, and a distance between the second plane (11A4) and the second side (10G) is the smallest.
  4. The antenna (10A, 1, 2) according to any one of claims 1-3, wherein a size of the first slot (11A1) and a size of the second slot (11A2) are associated with an operating frequency band of the antenna (10A, 1, 2).
  5. The antenna (10A, 1, 2) according to any one of claims 1-4, wherein a length of the first slot (11A1) is the same as a length of the second slot (11A2).
  6. The antenna (10A, 1, 2) according to any one of claims 1-5, wherein the antenna (10A, 1, 2) further comprises a filling medium (13A), and the filling medium (13A) is disposed between the feed (12A) and the first resonant cavity (11A) for fixing the feed (12A).
  7. The antenna (10A, 1, 2) according to claim 1, wherein the size of the first slot (11A1), the size of the second slot (11A2), and a size of the third slot (11A5) are associated with the operating frequency band of the antenna (10A, 1, 2).
  8. The antenna (10A, 1, 2) according to claim 7, wherein the operating frequency band of the antenna (10A, 1, 2) is determined according to a first formula, and the first formula comprises: f = 1 με m 2 a 2 + n 2 b 2 + p 2 l 2 , wherein µ represents magnetic permeability of the filling medium (13A); ε represents permittivity of the filling medium (13A); m represents a quantity of half-wavelengths of an equivalent cavity in an X-axis direction, and the equivalent cavity is a rectangular resonant cavity equivalent to the first resonant cavity (11A); a represents a length of the equivalent cavity in the X-axis direction; n represents a quantity of half-wavelengths of the equivalent cavity in a Y-axis direction; b represents a length of the equivalent cavity in the Y-axis direction; p represents a quantity of half-wavelengths of the equivalent cavity in a Z-axis direction; and l represents a length of the equivalent cavity in the Z-axis direction, and the length of the equivalent cavity in the Z-axis direction is determined based on a slot size of the first resonant cavity (11A).
  9. The antenna (10A, 1, 2) according to any one of claims 1-8, wherein the feed (12A) is disposed at a location with maximum electric field strength of a fundamental mode in the first resonant cavity (11A).
  10. The antenna (10A, 1, 2) according to any one of claims 1-5, wherein the feed (12A) is fixed to the metal backplane (10E) by using a screw.
  11. The antenna (10A, 1, 2) according to any one of claims 1-10, wherein the antenna (10A, 1, 2) radiates signals through the first slot (11A1) and the second slot (11A2).
  12. The antenna (10A, 1, 2) according to any one of claims 1-11, wherein one end of the first slot (11A1) and one end of the second slot (11A2) are communicated at a third side, the other end of the first slot (11A1) is flush with a fourth side, the other end of the second slot (11A2) is flush with a fifth side, the third side is the side that intersects the first plane (11A3) with the second plane (11A4), the fourth side is the side on the first plane (11A3) that does not intersect with the third side, and the fifth side is the side on the second plane (11A4) that does not intersect with the third side.
  13. The antenna (10A, 1, 2) according to any one of claims 1, 3-12 wherein the first resonant cavity (11A) is a resonant cavity of a cuboid.
  14. An electronic device (10, 100), wherein the electronic device (10, 100) comprises the antenna (10A, 1, 2) according to any one of claims 1-13.

Description

This application claims priority to Chinese Patent Application No. 202111282691.5, entitled "ANTENNA AND ELECTRONIC DEVICE", filed with the China National Intellectual Property Administration on November 1, 2021. TECHNICAL FIELD Embodiments of this application relate to the field of antenna technologies, and in particular, to an antenna and an electronic device. BACKGROUND With development of communication technologies, an antenna is usually disposed on an electronic device, and is configured to implement a communication connection to another electronic device. For example, an antenna is disposed on a television, and the television is connected to a remote control by using the antenna, so that the remote control can control the television. The electronic device is usually further integrated with another functional device. The television is still used as an example. The television usually has a speaker, a supporting stand, and the like. These devices need to be mounted at specified locations. Therefore, the antenna is usually disposed at a location at which two sides of the television intersect. When the antenna is disposed at the location at which the two sides of the television intersect, directivity of the antenna is high, and coverage in front of a screen of the television is poor. Document US 2010/182205 A1 describes an antenna for electronic devices with quartered rectangular cavity. Document CN 105 244 626 A describes an antenna with cavity backed slot antenna structure. Document US 2014/203974 A1 describes an electronic device with an antenna unit disposed in the casing of the body of the electronic device. Based on this, it is necessary to provide an antenna with low directivity, to increase signal coverage in front of the screen of the television. SUMMARY Embodiments of this application provide an antenna and an electronic device, which can increase signal coverage in front of a screen of a television. According to a first aspect, an antenna is provided. The antenna is disposed in an electronic device, the electronic device includes a metal backplane, and the antenna includes a first resonant cavity and a feed; the first resonant cavity includes a first slot and a second slot, the first slot is provided on a first plane in the first resonant cavity, and the first plane is a plane on which a long side of the first resonant cavity is located; the second slot is provided on a second plane that is in the first resonant cavity and that is adjacent to the first plane, and the first plane and the second plane are perpendicular to a plane on which the metal backplane is located; and the feed is disposed in the first resonant cavity for feeding the antenna; the first resonant cavity further comprises a third slot, the third slot is provided on a third plane in the first resonant cavity, the third plane is adjacent to the first plane or the second plane, and the third plane is perpendicular to the plane on which the metal backplane is located. The antenna provided in this embodiment of this application is disposed in the electronic device. The electronic device includes the metal backplane, and the antenna includes the first resonant cavity and the feed. The first resonant cavity includes the first slot and the second slot, the first slot is provided on the first plane in the first resonant cavity, and the first plane is the plane on which the long side of the first resonant cavity is located. The second slot is provided on the second plane that is in the first resonant cavity and that is adjacent to the first plane, and the first plane and the second plane are perpendicular to the plane on which the metal backplane is located. The feed is disposed in the first resonant cavity for feeding the antenna. The antenna including the first resonant cavity is used to radiate a signal by using the first slot and the second slot on the first resonant cavity, so that the antenna in this embodiment of this application can be used to increase a dimension of a radiation direction of a slot antenna, thereby reducing antenna directivity. Therefore, the signal can cover most areas in front of a screen of the electronic device, increasing signal coverage in front of the screen of the electronic device. In an embodiment, the first resonant cavity is an L-shaped resonant cavity. In this embodiment of this application, the L-shaped resonant cavity is used as the first resonant cavity. Through simulation and testing, for the antenna using the L-shaped resonant cavity as the first resonant cavity, coverage in front of a screen is optimal. In an embodiment, the L-shaped resonant cavity is disposed at a location at which a first side and a second side of the electronic device intersect, a distance between the first plane and the first side is the smallest, and a distance between the second plane and the second side is the smallest. It should be understood that the first side and the second side are outer bezels of the electronic dev