Foldable electronic device and antenna system for same

Patent metadata

Field	Value
Publication number	US-12469959-B2
Application number	US-202218577384-A
Country	US
Kind code	B2
Filing date	Aug 22, 2022
Priority date	Dec 22, 2021
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

This application provides a foldable electronic device and an antenna system for same. The antenna system includes a main antenna element and a parasitic antenna element. The main antenna element includes a feed point and a first radiating branch disposed on a first body of the electronic device. The parasitic antenna element includes a second radiating branch disposed on a second body of the electronic device. In a folded state, the first radiating branch and the second radiating branch are at least partially overlapped. The first radiating branch is configured to perform magnetic field coupling with the second radiating branch, to form current loop radiation on both the first radiating branch and the second radiating branch, and a current direction in a current loop formed on the first radiating branch is the same as a current direction in a current loop formed on the second radiating branch.

First claim

What is claimed is:

1 . An antenna system, applied to a foldable electronic device, wherein the foldable electronic device comprises a first body and a second body that are connected to each other and are capable of being folded or unfolded relative to each other; the antenna system comprises:
a main antenna element, comprising a feed point and a first radiating branch disposed on the first body, wherein the main antenna element is an antenna structure having a radiation characteristic of a current loop antenna, and the feed point is used to feed the first radiating branch; and a parasitic antenna element, comprising a second radiating branch disposed on the second body; and when the electronic device is in a folded state, the first radiating branch and the second radiating branch are at least partially overlapped, the first radiating branch is configured to perform magnetic field coupling with the second radiating branch, to form current loop radiation on both the first radiating branch and the second radiating branch, and a current direction in a current loop formed on the first radiating branch is the same as a current direction in a current loop formed on the second radiating branch, wherein the electronic device further comprises a first reference ground corresponding to the first body and a second reference ground corresponding to the second body; and when the electronic device is in the folded state, the main antenna element is configured to excite a closed current loop on the first radiating branch and the first reference ground, and is configured to perform magnetic field coupling with the parasitic antenna element, to excite a closed current loop on the second radiating branch and the second reference ground, wherein the current direction on the first radiating branch is the same as the current direction on the second radiating branch, the current direction on the first radiating branch is opposite to a current direction on the first reference ground, the current direction on the second radiating branch is opposite to a current direction on the second reference ground, and the current direction on the first reference ground is the same as the current direction on the second reference ground.

2 . The antenna system according to claim 1 , wherein the main antenna element and the parasitic antenna element are separately any one of a current loop slot antenna, a current loop monopole antenna, a current loop dipole antenna, a current loop left-handed antenna, and a left-handed antenna.

3 . The antenna system according to claim 2 , wherein the electronic device further comprises a connecting part disposed between the first body and the second body, and the first body and the second body are connected through the connecting part; and
the first radiating branch is disposed at an edge, opposite to the connecting part, of the first body, and the second radiating branch is disposed at an edge, opposite to the connecting part, of the second body.

4 . The antenna system according to claim 3 , wherein the first radiating branch is disposed in a middle of the edge, opposite to the connecting part, of the first body, and the second radiating branch is disposed in a middle of the edge, opposite to the connecting part, of the second body.

5 . The antenna system according to claim 1 , wherein the first radiating branch is coupled to the feed point, and the first radiating branch is configured to generate a current by exciting the feed point, and perform radiation having a radiation characteristic of a current loop antenna; or
the main antenna element further comprises a feed branch, the feed point is disposed on the feed branch, the feed branch and the first radiating branch are spaced apart, and the feed branch couples energy to the first radiating branch through electric field coupling/magnetic field coupling, to excite the first radiating branch to perform current loop radiation.

6 . An antenna system, applied to a foldable electronic device, wherein the foldable electronic device comprises a first body and a second body that are connected to each other and are capable of being folded or unfolded relative to each other; the antenna system comprises:
a main antenna element, comprising a feed point and a first radiating branch disposed on the first body, wherein the main antenna element is an antenna structure having a radiation characteristic of a current loop antenna, and the feed point is used to feed the first radiating branch; and a parasitic antenna element, comprising a second radiating branch disposed on the second body; and when the electronic device is in a folded state, the first radiating branch and the second radiating branch are at least partially overlapped, the first radiating branch is configured to perform magnetic field coupling with the second radiating branch, to form current loop radiation on both the first radiating branch and the second radiating branch, and a current direction in a current loop formed on the first radiating branch is the same as a current direction in a current loop formed on the second radiating branch, wherein the main antenna element and/or the parasitic antenna element are/is a current loop slot antenna, and a radiating branch of the current loop slot antenna comprises two radiators with opposite ends, the opposite ends of the two radiators are coupled through a first capacitor, the other ends of the two radiators are respectively coupled to a corresponding reference ground, and a gap is formed between the two radiators and the reference ground; or the main antenna element and/or the parasitic antenna element are/is a current loop monopole antenna, a radiating branch of the current loop monopole antenna comprises one radiator, one end of the radiator is coupled to a corresponding reference ground or the feed point through a second capacitor, and the other end of the radiator is coupled to the corresponding reference ground through a third capacitor; and a length of the radiating branch of the current loop monopole antenna is less than a quarter of an operating wavelength of the current loop monopole antenna; or the main antenna element and/or the parasitic antenna element are/is a current loop dipole antenna, a radiating branch of the current loop dipole antenna comprises two radiators with opposite ends, the opposite ends of the two radiators are coupled through a first capacitor, the other end of one of the two radiators is coupled to a corresponding reference ground through a second capacitor, and the other end of the other of the two radiators is coupled to the corresponding reference ground through a third capacitor; and a length of the radiating branch of the current loop dipole antenna is less than half of an operating wavelength of the current loop dipole antenna; or the main antenna element and/or the parasitic antenna element are/is a current loop left-handed antenna, a radiating branch of the current loop left-handed antenna comprises two radiators with opposite ends, the opposite ends of the two radiators are coupled through a first capacitor, the other end of one of the two radiators is coupled to a corresponding reference ground or the feed point through a fourth capacitor, and the other end of the other of the two radiators is coupled to the corresponding reference ground; or the main antenna element and/or the parasitic antenna element are/is a left-handed antenna, a radiating branch of the left-handed antenna comprises one radiator, one end of the radiator is coupled to a corresponding reference ground or the feed point through a fourth capacitor, and the other end of the radiator is coupled to the corresponding reference ground.

7 . The antenna system according to claim 6 , wherein
when an operating band of t

Assignees

• Honor Device Co Ltd

Inventors

• Li Yuanpeng
• Zhou Dawei

Classifications

• H01Q1/48

  Earthing means; Earth screens; Counterpoises · CPC title

• H01Q1/52

  Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure (absorbing means H01Q17/00) · CPC title

• H01Q9/42

  with folded element, the folded parts being spaced apart a small fraction of the operating wavelength · CPC title

• H01Q13/10

  Resonant slot antennas · CPC title

• H01Q9/26

  with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength (resonant loop antennas H01Q7/00) · CPC title