US-20260128499-A1 - Foldable Electronic Device

Abstract

A foldable electronic device includes an antenna, where the antenna uses a first side frame and a second side frame that are disposed in the foldable electronic device as radiators. A part of the first side frame is used as a feed stub, and a part of the second side frame is used as a parasitic stub. A gap is provided on the parasitic stub, so that a radiation aperture of the parasitic stub is increased.

Inventors

• Liang Xue
• Jiaming Wang
• Dong Yu
• Jikang Wang
• Huatao LIU
• Baokun XI
• Kun Feng

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260507

Application Date

20251219

Priority Date

20230621

Claims (20)

1. 1 . A foldable electronic device, comprising: a ground plane; a first housing comprising a first side frame, wherein the ground plane and at least a part of the first side frame are spaced apart, wherein the first side frame comprises a first portion and a second portion, wherein the first side frame is coupled to the ground plane at the first portion or comprises a first slot at the first portion, and wherein the first side frame is coupled to the ground plane at the second portion or comprises a second slot at the second portion; a second housing comprising a second side frame, wherein the ground plane and at least a part of the second side frame are spaced apart, wherein the second side frame comprises a third portion and a fourth portion, wherein the second side frame is coupled to the ground plane at the third portion, and wherein the second side frame comprises a third slot at the fourth portion; a first rotating shaft located between the first housing and the second housing, wherein the first rotating shaft is rotatably connected to the first housing and the second housing separately; and an antenna comprising: a first radiator comprising a first feed point, wherein the first radiator is a conductive part between the first portion and the second portion of the first side frame; a first feed circuit coupled to the first feed point; a second radiator comprising a first coupling point, a second coupling point, and a fourth slot between the first coupling point and the second coupling point, wherein the second radiator is a conductive part between the third portion and the fourth portion of the second side frame, and wherein a second radiator length of the second radiator is less than or equal to three times a first radiator length of the first radiator; and a first element comprising: a first end coupled to the first coupling point; and a second end coupled to the second coupling point, wherein when the foldable electronic device is in a folded state, the first radiator and the second radiator are configured to at least partially overlap in a thickness direction of the foldable electronic device, the first radiator is configured to generate a first resonance, and the second radiator and the first element are configured to generate a first parasitic resonance.
2. 2 . The foldable electronic device of claim 1 , wherein the second radiator further comprises: a first length between the third portion and the fourth slot; and a second length between the third slot and the fourth slot, wherein the first length is less than the second length.
3. 3 . The foldable electronic device of claim 1 , wherein the first element further comprises an equivalent capacitance value that is less than or equal to a first threshold, wherein when a resonance point frequency of the first parasitic resonance is less than or equal to 1 gigahertz (GHz), the first threshold is 10 picofarads (pF), and wherein when the resonance point frequency of the first parasitic resonance is greater than 1 GHz, the first threshold is 2 pF.
4. 4 . The foldable electronic device of claim 1 , wherein the second radiator further comprises a third coupling point, wherein the antenna further comprises a second element, wherein the second element comprises: a third end coupled to the third coupling point; and a fourth end coupled to the ground plane, and wherein the second radiator, the first element, and the second element are configured to generate the first parasitic resonance.
5. 5 . The foldable electronic device of claim 4 , wherein the second element comprises an equivalent inductance value that is less than or equal to 10 nanohenries (nH).
6. 6 . The foldable electronic device of claim 4 , wherein the first coupling point is located between the third portion and the fourth slot, wherein the second coupling point is located between the fourth portion and the fourth slot, and wherein the third coupling point is either: located between the third portion and the first coupling point such that a first distance between the first coupling point and the third coupling point is greater than or equal to 0 millimeter (mm) and less than or equal to 5 mm; or located between the fourth portion and the second coupling point such that a second distance between the second coupling point and the third coupling point is greater than or equal to 0 mm and less than or equal to 5 mm.
7. 7 . The foldable electronic device of claim 1 , wherein at least one of a first distance between the first coupling point and the fourth slot is less than or equal to 5 millimeter (mm) or a second distance between the second coupling point and the fourth slot is less than or equal to 5 mm.
8. 8 . The foldable electronic device of claim 1 , wherein the second radiator comprises an electrical length that is greater than three eighths of a first wavelength, and wherein the first wavelength corresponds to the first parasitic resonance.
9. 9 . The foldable electronic device of claim 1 , wherein when a first resonance point frequency of the first resonance is less than or equal to 1.5 gigahertz (GHz), a difference between a second resonance point frequency of the first parasitic resonance and the first resonance point frequency is less than or equal to 200 megahertz (MHz), wherein when the first resonance point frequency is less than or equal to 3 GHz and greater than 1.5 GHZ, a difference between the second resonance point frequency and the first resonance point frequency is less than or equal to 400 MHZ, and wherein when the first resonance point frequency is less than or equal to 6 GHz and greater than 3 GHZ, a difference between the second resonance point frequency and the first resonance point frequency is less than or equal to 600 MHz.
10. 10 . The foldable electronic device of claim 1 , wherein the second radiator length is greater than or equal to 0.8 times the first radiator length.
11. 11 . The foldable electronic device of claim 1 , wherein the first side frame is coupled to the ground plane at the first portion, and wherein the first side frame further comprises the second slot at the second portion.
12. 12 . The foldable electronic device of claim 11 , wherein the second radiator length is greater than or equal to 1.5 times the first radiator length, and wherein the second radiator length is less than or equal to 2.5 times the first radiator.
13. 13 . The foldable electronic device of claim 12 , wherein the first feed point is located between a first ground point and the second portion, wherein the first radiator further comprises a fourth coupling point located between the first portion and the first ground point, wherein the antenna further comprises a third element, and wherein the third element comprises: a third end coupled to the fourth coupling point; and a fourth end coupled to the ground plane.
14. 14 . The foldable electronic device of claim 11 , wherein the first side frame comprises a fifth portion and a sixth portion, wherein the second portion is located between the fifth portion and the first portion, wherein the fifth portion is located between the second portion and the sixth portion, wherein the first side frame is coupled to the ground plane at the fifth portion, wherein the first side frame comprises a fifth slot at the sixth portion, and wherein the antenna further comprises: a third radiator comprising a second feed point, wherein the third radiator is a conductive part between the second portion and the sixth portion of the first side frame; and a second feed circuit coupled to the second feed point.
15. 15 . The foldable electronic device of claim 14 , wherein the third radiator further comprises a fourth coupling point, wherein the second feed point is located between the fifth portion and the sixth portion, wherein the fourth coupling point is located between the second portion and the fifth portion, wherein the antenna further comprises a third element, and wherein the third element comprises: a third end coupled to the fourth coupling point; and a fourth end coupled to the ground plane.
16. 16 . The foldable electronic device of claim 14 , wherein the third radiator further comprises: a fourth coupling point located between the fifth portion and the sixth portion; and a fifth coupling point located between the second portion and the fifth portion, and wherein the antenna further comprises: a first tuning component comprising: a third end coupled to the fourth coupling point; and a fourth end coupled to the ground plane; and a second tuning component comprising: a fifth end coupled to the fifth coupling point; and a sixth end coupled to the ground plane.
17. 17 . The foldable electronic device of claim 11 , wherein the first side frame comprises a fifth portion and a sixth portion, wherein the second portion is located between the fifth portion and the first portion, wherein the fifth portion is located between the second portion and the sixth portion, wherein the first side frame is coupled to the ground plane at the fifth portion, wherein the first side frame comprises a fifth slot at the sixth portion, and wherein the antenna further comprises: a third radiator comprising a second feed point, wherein the third radiator is a conductive part between the fifth portion and the sixth portion of the first side frame; and a second feed circuit coupled to the second feed point.
18. 18 . The foldable electronic device of claim 1 , further comprising: a third housing having a third side frame, wherein the ground plane and at least a part of the third side frame are spaced apart, wherein the third side frame comprises a fifth portion and a sixth portion, and wherein the third side frame is coupled to the ground plane at the fifth portion or comprises a fifth slot at the fifth portion, and the third side frame is coupled to the ground plane at the sixth portion or comprises a sixth slot at the sixth portion; a second rotating shaft located between the first housing and the third housing, and rotatably connected to the first housing and the third housing separately, wherein the antenna further comprises: a third radiator comprising a second feed point, wherein the third radiator is a conductive part between the fifth portion and the sixth portion of the first side frame; and a second feed circuit coupled to the second feed point, and wherein when the foldable electronic device is in the folded state, the third radiator and the second radiator are configured to at least partially overlap in the thickness direction.
19. 19 . The foldable electronic device of claim 18 , wherein the first side frame comprises the first slot at the first portion and the second slot at the second portion, wherein the third side frame is coupled to the ground plane at the fifth portion, wherein the third side frame comprises the sixth slot at the sixth portion, wherein the first side frame further comprises a first ground point located between the first portion and the second portion, and wherein the first side frame is coupled to the ground plane.
20. 20 . The foldable electronic device of claim 18 , wherein the first side frame comprises the first slot at the first portion and the second slot at the second portion, wherein the third side frame comprises the fifth slot at the fifth portion, wherein the third side frame comprises the sixth slot at the sixth portion, wherein the first side frame further comprises a first ground point located between the first portion and the second portion, wherein the first side frame is coupled to the ground plane at the first ground point, wherein the third side frame further comprises a second ground point located between the fifth portion and the sixth portion, and wherein the third side frame is coupled to the ground plane at the second ground point.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation of International Patent Application No. PCT/CN2024/100152 filed on Jun. 19, 2024, which claims priority to Chinese Patent Application No. 202310748091.6 filed on Jun. 21, 2023, and Chinese Patent Application No. 202410313049.6 filed on Mar. 19, 2024. All of the aforementioned patent applications are hereby incorporated by reference in their entireties. TECHNICAL FIELD This disclosure relates to the field of wireless communication, and in particular, to a foldable electronic device. BACKGROUND Wireless communication technologies are rapidly evolving. In the past, a second generation (2G) mobile communication system mainly supports a call function, electronic devices are merely tools used by people to send and receive Short Message Service (SMS) messages and perform voice communication, and a wireless network access function is extremely slow because data is transmitted through a voice channel. Nowadays, in addition to making calls, sending SMS messages, and taking photos, an electronic device can be further used for listening to music online, watching online movies, making video calls in real time, and the like, covering various applications such as a call application, a movie and television entertainment application, and an e-commerce application in people's life. In this case, a plurality of functional applications may need to upload and download data over a wireless network. Therefore, high-speed data transmission becomes extremely important. As people have an increasingly high requirement for high-speed data transmission, a development trend of an industrial design (ID) of the electronic device is to have a large screen-to-body ratio and a plurality of cameras. Consequently, antenna clearance is greatly reduced, and space for layout is increasingly limited. However, this is in conflict with features of the antenna serving as an open system, restricting performance of the antenna. SUMMARY Embodiments of this disclosure provide a foldable electronic device, including an antenna. The antenna uses a first side frame and a second side frame that are disposed in a foldable manner of an electronic device as radiators. A part of the first side frame is used as a radiation stub (a stub for feeding a signal at a feed point), and a part of the second side frame is used as a parasitic stub (a stub for coupling a signal by coupling a main radiation stub). A gap is provided on the parasitic stub, so that a radiation aperture of the antenna is increased to improve a radiation characteristic of the antenna. According to a first aspect, a foldable electronic device is provided, including: a first housing, a second housing, and a ground plane, where the first housing includes a first side frame, the second housing includes a second side frame, at least a part of the first side frame and the ground plane are spaced apart, and at least a part of the second side frame and the ground plane are spaced apart; the first side frame includes a first position and a second position, where the first side frame is coupled to the ground plane at the first position or is provided with a first slot at the first position, and the first side frame is coupled to the ground plane at the second position or is provided with a second slot at the second position; and the second side frame includes a third position and a fourth position, the second side frame is coupled to the ground plane at the third position, and the second side frame is provided with a third slot at the fourth position; a first rotating shaft, where the first rotating shaft is located between the first housing and the second housing, and the first rotating shaft is rotatably connected to the first housing and the second housing separately; and an antenna, where the antenna includes: a first radiator and a first feed circuit, where the first radiator is a conductive part, between the first position and the second position, of the first side frame, the first radiator includes a first feed point, and the first feed circuit is coupled to the first feed point; and a second radiator and a first element, where the second radiator is a conductive part, between the third position and the fourth position, of the second side frame, and a length of the second radiator is less than or equal to three times a length of the first radiator; and the second radiator includes a first coupling point and a second coupling point, the second radiator is provided with a fourth slot between the first coupling point and the second coupling point, a first end of the first element is coupled to the first coupling point, and a second end of the first element is coupled to the second coupling point, where when the foldable electronic device is in a folded state, the first radiator and the second radiator at least partially overlap in a first direction, the first radiator is configured to generate a first resonance, the second radiator and the f