Terminal device

Abstract

This application provides a terminal device, including a metal floor, a radiation stub, and a feed source. The radiation stub is disposed adjacent to and parallel to a preset side of the metal floor, where a projection on the preset side of the metal floor is located inside the preset side, and the radiation stub includes at least one connection portion connected to the preset side of the metal floor. The feed source is electrically connected to the radiation stub, and is configured to excite the radiation stub to generate an excitation current conducted in a first direction, so that the preset side of the metal floor generates a floor current, where a direction of a floor current of a first region corresponding to the radiation stub in the preset side of the metal floor is a second direction, a direction of a floor current of a second region in the preset side of the metal floor is the first direction, the second region is adjacent to the first region, the second direction is opposite to the first direction, and the radiation stub includes a main stub whose electrical length is 1 / 2 wavelength corresponding to a preset frequency band. Such current distribution reduces a directivity factor after superposition of far-field radiation electric field vectors, thereby improving omnidirectionality of an antenna.

Description

[0001] This application claims priority to Chinese Patent Application No. 202410257484.1, entitled "TERMINAL DEVICE" filed with the China National Intellectual Property Administration on March 6, 2024, which is incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates to the field of electronic devices, and in particular, to a terminal device.BACKGROUND

[0003] For some current terminal devices, internal antennas thereof are usually designed as an IFA, a left-hand antenna, a monopole antenna, and the like. In a same clearance environment, these antennas have low efficiency, a low single-mode resonance bandwidth, a strong floor current, and a large impact of a floor current on directivity pattern deterioration, resulting in a poor directivity factor of the antenna, fewer directions of the antenna, and low omnidirectionality.SUMMARY

[0004] Therefore, this application provides a terminal device, to provide a more suitable antenna body and a floor current, thereby improving omnidirectionality of an antenna.

[0005] This application provides a terminal device, the terminal device including a metal floor, a radiation stub, and a feed source. The radiation stub is disposed adjacent to and parallel to a preset side of the metal floor, where a projection on the preset side of the metal floor is located inside the preset side, the radiation stub includes at least one connection portion, and the at least one connection portion is connected to the preset side of the metal floor. The feed source is electrically connected to the radiation stub, and is configured to excite the radiation stub to generate an excitation current conducted in a first direction, so that the radiation stub supports receiving and sending of an electromagnetic wave signal in a preset frequency band, and the preset side of the metal floor generates a floor current, where a direction of a floor current of a first region corresponding to the radiation stub in the preset side of the metal floor is a second direction, a direction of a floor current of a second region in the preset side of the metal floor is the first direction, the second region is a region adjacent to the first region, the second direction is opposite to the first direction, the radiation stub includes a main stub, and an electrical length of the main stub is 1 / 2 wavelength corresponding to the preset frequency band.

[0006] Compared with a current generated by a common antenna in the existing technology, that is, currents of the second region close to the preset side of the metal floor are not all in a same direction with currents on the radiation stub, and a floor current on the metal floor has a plurality of periods. In this application, because a directivity pattern of an antenna is a sum of far-field radiation electric field vectors of all excited current elements, the electrical length of the main stub is 1 / 2 wavelength corresponding to a center frequency of the preset frequency band, so that both the direction of the floor current of the second region in the preset side of the metal floor and a direction of an excitation current on the radiation stub during resonance are the first direction, the direction of the floor current of the first region in the preset side of the metal floor is the second direction, the second region is a region close to the first region, and the second direction is opposite to the first direction. In other words, the excitation current on the radiation stub is in the first direction, and a floor current on two sides of the radiation stub is in a same direction as the excitation current on the radiation stub, and is opposite to a floor current at a position corresponding to a position of the radiation stub. Such current distribution reduces a directivity factor after superposition of far-field radiation electric field vectors. Therefore, compared with the existing technology, a directivity factor of the antenna can be reduced, and omnidirectionality of the antenna can be improved.

[0007] In a possible implementation, the preset frequency band is 2.4 GHz. Because the omnidirectionality of the antenna is improved, when the terminal device communicates in the 2. GHz frequency band, the terminal device can better receive and send an electromagnetic wave signal in all directions.

[0008] In a possible implementation, the main stub includes a first stub and a second stub, a first gap exists between the first stub and the second stub, the first stub and the second stub are spaced apart from each other through the gap and are symmetrically disposed on two sides of the gap, the at least one connection portion of the radiation stub is one end that is of each of the first stub and the second stub and that is away from the first gap, and one end that is of each of the first stub and the second stub and that is away from the first gap is connected to the metal floor; and the feed source is electrically connected to the first stub and / or the second stub, and the feed source is configured to excite the first stub and / or the second stub, so that both the first stub and the second stub generate the excitation current conducted in the first direction, and the first stub and the second stub support receiving and sending of the electromagnetic wave signal in the preset frequency band. Because a current on the antenna close to a dipole current indicates a lower directivity factor and higher omnidirectionality of the antenna, the first stub and the second stub are spaced apart from each other through the first gap and are symmetrically disposed on the two sides of the first gap, so that a structure of the main stub is a structure of a dipole antenna, and the current generated on the main stub is the dipole current, thereby leading to a lower directivity factor and higher omnidirectionality of the antenna.

[0009] In a possible implementation, the feed source is electrically connected to the first stub, and the feed source is configured to excite the first stub to generate the excitation current conducted in the first direction, and excite, via coupling through the first gap, the second stub to generate the excitation current conducted in the first direction. Therefore, the main stub entirely presents the excitation current conducted in the first direction.

[0010] In a possible implementation, the feed source is connected to the first stub and the second stub, and the feed source is configured to respectively output two feed signals having opposite phases to the first stub and the second stub, so that both the excitation current on the first stub and the excitation current on the second stub are conducted in the first direction. Therefore, the main stub entirely presents the excitation current conducted in the first direction.

[0011] In a possible implementation, the feed source includes a first feed source and a second feed source, the first feed source is electrically connected to the first stub, the second feed source is electrically connected to the second stub, the first feed source and the second feed source respectively provide feed signals to the first stub and the second stub, and the feed signals provided by the first feed source and the second feed source have opposite phases, so that both the first stub and the second stub generate the excitation current conducted in the first direction. Therefore, the main stub entirely presents the excitation current conducted in the first direction.

[0012] In a possible implementation, the main stub includes a first end and a second end that are opposite, the radiation stub further includes a first parasitic stub and a second parasitic stub, both the first parasitic stub and the second parasitic stub are disposed parallel to the main stub, one end of the first parasitic stub and one end of the second parasitic stub are respectively disposed adjacent to the first end and the second end of the main stub and have a gap with the main stub, the at least one connection portion of the radiation stub is one end that is of each of the first parasitic stub and / or the second parasitic stub and that is away from the main stub, and the other end that is of each of the first parasitic stub and / or the second parasitic stub is connected to the metal floor. The addition of the first parasitic stub and the second parasitic stub can enhance radiation efficiency. In addition, because the first parasitic stub and the second parasitic stub are both disposed parallel to the main stub, and one end of the first parasitic stub and one end of the second parasitic stub are respectively disposed adjacent to the first end and the second end of the main stub, an electrical length of an antenna structure can be increased, so that electric energy is dispersed, the directivity factor is reduced, and the omnidirectionality of the antenna is improved.

[0013] In a possible implementation, the first parasitic stub and the second parasitic stub are centrally symmetrical about the main stub. A more symmetrical antenna structure may cause a more symmetrical excitation current, to cause a lower directivity factor and higher omnidirectionality of the antenna. Therefore, the first parasitic stub and the second parasitic stub are centrally symmetrical about the main stub, so that the directivity factor is reduced, and the omnidirectionality of the antenna is improved.

[0014] In a possible implementation, the main stub includes a first stub and a second stub, a first gap exists between the first stub and the second stub, the first stub and the second stub are spaced apart from each other through the first gap and are symmetrically disposed on two sides of the first gap, end portions that are of the first stub and the second stub and that are away from each other are the first end and the second end, both the first parasitic stub and the second parasitic stub are connected to the metal floor, and the feed source is separately connected to the first stub and the second stub, and respectively outputs two feed signals having opposite phases to the first stub and the second stub, so that all of the first parasitic stub, the first stub, the second stub, and the second parasitic stub generate the excitation current conducted in the first direction. Therefore, the current on the entire radiation stub is conducted in the first direction.

[0015] In a possible implementation, the main stub is a continuous stub, the second parasitic stub is connected to the metal floor, the feed source is electrically connected to the first parasitic stub, and the feed source is configured to provide a feed signal to the first parasitic stub, excite the first parasitic stub to generate the excitation current conducted in the first direction, excite, via coupling through a second gap between the first parasitic stub and the main stub, the main stub to generate the excitation current conducted in the first direction, and excite, via coupling through a third gap between the main stub and the second parasitic stub, the second parasitic stub to generate the excitation current conducted in the first direction, so that all of the first parasitic stub, the main stub, and the second parasitic stub generate the excitation current conducted in the first direction. Therefore, the excitation current on the entire antenna structure is conducted in the first direction, and feeding is easily performed.

[0016] In a possible implementation, one of the at least one connection portion is a midpoint of the main stub, and the midpoint of the main stub is connected to the metal floor. Therefore, electrostatic shielding can be implemented, and a bandwidth can be increased. In addition, because the midpoint of the main stub is a large current point and a small voltage point, the midpoint of the main stub is connected to the metal floor without affecting a conduction direction of the current on the main stub.

[0017] In a possible implementation, the metal floor current includes a notch disposed in the first region of the preset side, the notch includes a first side, a second side, and a third side, one end of each of the first side and the second side is connected to the third side, the other end of each of the first side and the second side is connected to the preset side, the preset side and the radiation stub are on a same straight line, the first side separately forms an angle with the third side and the preset side, and the second side separately forms an angle with the third side and the preset side, the first parasitic stub is located between the main stub and the first side, the second parasitic stub is located between the main stub and the second side, another one of the at least one connection portion is an end portion of the second parasitic stub, a fourth gap exists between the first parasitic stub and the first side, and the end portion of the second parasitic stub is connected to the metal floor. Because the fourth gap exists between the first parasitic stub and the first side, in addition to operating in the 2.4 GHz frequency band, the radiation stub may also operate between 5 GHz to 7 GHz frequency band, and therefore may further be applied to Wi-Fi-6E and Wi-Fi 7, so that the antenna covers both Wi-Fi high and low frequencies.

[0018] In a possible implementation, both electrical lengths of the first parasitic stub and the second parasitic stub are less than or equal to 1 / 4 wavelength corresponding to the preset frequency band. Because when the electrical lengths of the first parasitic stub and the second parasitic stub are greater than 1 / 4 wavelength corresponding to the preset frequency band, the current on the antenna structure cannot be entirely conducted in the first direction, resulting in an increase of the directivity factor. Therefore, the electrical lengths of the first parasitic stub and the second parasitic stub being less than or equal to 1 / 4 wavelength corresponding to the preset frequency band can avoid an increase of the directivity factor.BRIEF DESCRIPTION OF DRAWINGS

[0019] To describe the technical solutions in this application more clearly, the following briefly introduces the accompanying drawings required for describing the implementations. Apparently, the accompanying drawings in the following descriptions show some implementations of this application, and a person of ordinary skill in the art may still derive other drawings based on these accompanying drawings without creative efforts. FIG. 1 is a diagram of distribution of a current on an IFA and a metal floor current in the existing technology; FIG. 2 is a diagram of a conduction direction of a current on an IFA and a conduction direction of a metal floor current in the existing technology; FIG. 3 is a diagram of a radiation direction of an IFA in the existing technology; FIG. 4 is a diagram of a radiation direction of an IFA operating at 2.7 GHz in the existing technology; FIG. 5 is a diagram of a structure of a terminal device according to some embodiments of this application; FIG. 6 is a diagram of conduction directions of currents on a radiation stub and a metal floor according to some embodiments of this application; FIG. 7 is a directivity pattern of an antenna when a terminal device 100 operates in a preset frequency band according to some embodiments; FIG. 8 is another directivity pattern of an antenna when a terminal device operates in a preset frequency band according to some embodiments of a radiation stub; FIG. 9 is a diagram of a partial structure of a terminal device in a first specific example according to some embodiments of this application; FIG. 10 is a diagram of a partial structure of a terminal device in a second specific example according to some embodiments of this application; FIG. 11 is a diagram of a partial structure of a terminal device in a third specific example according to some embodiments of this application; FIG. 12 is a diagram of a partial structure of a terminal device in a fourth specific example according to some embodiments of this application; FIG. 13 is a diagram of a partial structure of a terminal device in a fifth specific example according to some embodiments of this application; FIG. 14 is a diagram of a partial structure of a terminal device in a sixth specific example according to some embodiments of this application; FIG. 15 is a diagram of radiation efficiency when a terminal device operates in a preset frequency band according to some embodiments of this application; FIG. 16 is a diagram of current distribution when a terminal device operates in a preset frequency band according to some embodiments of this application; FIG. 17 is a diagram of current distribution when another terminal device operates in a preset frequency band according to some embodiments of this application; FIG. 18 is a directivity pattern of some terminal devices operating in a preset frequency band according to some embodiments of this application; FIG. 19 is a curve diagram of an S-parameter of a terminal device according to some embodiments of this application; FIG. 20 is a simulated diagram of a voltage corresponding to a midpoint of a main stub corresponding to an antenna structure in FIG. 14; FIG. 21 is a current simulation diagram corresponding to a midpoint of a main stub corresponding to an antenna structure in FIG. 14; FIG. 22 is a diagram of a partial structure of a seventh terminal device according to some embodiments of this application; FIG. 23 is a curve diagram of an S-parameter and radiation efficiency of a terminal device according to some embodiments of this application; FIG. 24 is a diagram of a current direction when an antenna structure in FIG. 22 operates at 5 GHz; FIG. 25 is a diagram of a current direction when an antenna structure in FIG. 22 operates at 6.5 GHz; FIG. 26 shows an equivalent circuit of an antenna structure in FIG. 22 implementing dual resonance between 5 GHz and 7 GHz; and FIG. 27 is an impedance diagram when an antenna structure in FIG. 22 operates between 4 GHz and 5 GHz. DESCRIPTION OF EMBODIMENTS

[0020] The following describes embodiments of this application with reference to the accompanying drawings.

[0021] In embodiments of this application, the terms "first", "second", and the like are intended to distinguish between different objects but do not indicate a particular order. In addition, orientation or position relationships indicated by terms "above", "below", "inner", "outer", and the like are orientation or position relationships based on the accompanying drawings, and are merely intended for ease of describing this application and simplifying description, rather than indicating or implying that an apparatus or element in question needs to have a specific orientation or needs to be constructed and operated in a specific orientation. Therefore, such terms cannot be construed as a limitation on this application.

[0022] In embodiments of this application, unless otherwise expressly specified and limited, the term "connect" needs to be understood in a broad sense. For example, such a term may indicate a fixed connection, a detachable connection, or an integral connection; may indicate direct interconnection, indirect interconnection through an intermediate medium, or an internal communication between two elements; and may indicate a communication connection, or an electrical connection. A person of ordinary skill in the art may understand specific meanings of the terms in this application according to specific situations.

[0023] Referring to FIG. 1 to FIG. 4, FIG. 1 is a diagram of distribution of a current on an IFA and a metal floor current in the existing technology; FIG. 2 is a diagram of a conduction direction of a current on an inverted F antenna (Inverted F Antenna, IFA) antenna and a conduction direction of a metal floor current in the existing technology; FIG. 3 is a diagram of a radiation direction of an IFA operating at 2.54 GHz in the existing technology; and FIG. 4 is a diagram of a radiation direction of an IFA operating at 2.7 GHz in the existing technology.

[0024] An IFA, a left-hand antenna, a monopole antenna, or the like is usually disposed for some terminal devices to communicate. However, for a terminal device with a small clearance environment, communication efficiency through these antennas is low, a single-mode resonance bandwidth is low, a metal floor current is strong, and an impact of the metal floor current on directivity pattern deterioration is sever. Consequently, a directivity factor is high, omnidirectionality of the antenna is not sufficient, and a PSD regulation limit is affected. Specifically, as shown in FIG. 1, a current is distributed in an edge region adjacent to the IFA on the metal floor, and there are many current periods. As shown in FIG. 2, a current on the IFA is conducted in a first direction, a current on the metal floor at a position corresponding to the IFA is conducted in a second direction, and currents of other regions on the metal floor close to the position corresponding to the IFA are conducted in the first direction or the second direction. Therefore, in the currents on the IFA and the floor current, there is a large quantity of currents conducted in opposite directions. As shown in FIG. 3, when the antenna operates at a frequency of 2.54 GHz, a directivity factor of the antenna is 4.447 dBi, so that the directivity factor is high. Consequently, the antenna has few directions and low omnidirectionality. As shown in FIG. 4, when the antenna operates at a frequency of 2.7 GHz, a directivity factor of the antenna is 6.921 dBi, so that the directivity factor is high. Consequently, the antenna operating at 2.7 GHz has low omnidirectionality.

[0025] It can be seen that, in an antenna structure in the existing technology, a high directivity factor occurs at a plurality of frequencies. Consequently, omnidirectionality at a plurality of frequencies is low, and a requirement for the omnidirectionality of the antenna in some scenarios cannot be satisfied.

[0026] Referring to FIG. 5 and FIG. 6, FIG. 5 is a diagram of a structure of a terminal device according to some embodiments of this application, and FIG. 6 is a diagram of conduction directions of currents on a radiation stub and a metal floor according to some embodiments of this application.

[0027] As shown in FIG. 5 and FIG. 6, this application provides a terminal device 100. The terminal device 100 may be, but is not limited to, a terminal device having a communication function, such as a computer, a tablet computer, or a mobile phone. Specifically, the terminal device 100 further supports Wi-Fi communication. A structure of an antenna in the terminal device 100 is adjusted to adjust current distribution during operation of the antenna, thereby reducing the directivity factor and improving the omnidirectionality of the antenna.

[0028] In some embodiments, as shown in FIG. 5 and FIG. 6, the terminal device 100 includes a metal floor 10, a radiation stub 20, and a feed source 30. The radiation stub 20 is disposed adjacent to and parallel to a preset side 101 of the metal floor 10, where a projection on the preset side 101 of the metal floor 10 is located inside the preset side 101, the radiation stub 20 includes at least one connection portion 201, and the at least one connection portion 201 is connected to the preset side 101 of the metal floor 10. As shown in FIG. 5 and FIG. 6, the feed source 30 is electrically connected to the radiation stub 20, and is configured to excite the radiation stub 20 to generate an excitation current i1 conducted in a first direction d1, so that the radiation stub 20 supports receiving and sending of an electromagnetic wave signal in a preset frequency band, and the preset side 101 of the metal floor 10 generates a floor current i2, where a direction of a floor current i2 of a first region A1 corresponding to the radiation stub 20 in the preset side 101 of the metal floor 10 is a second direction d2, a direction of a floor current i2 of a second region A2 in the preset side 101 of the metal floor 10 is the first direction d1, the second region A2 is a region adjacent to the first region A1, the second direction d2 is opposite to the first direction d1, the radiation stub 20 includes a main stub 21, and an electrical length of the main stub 21 is 1 / 2 wavelength corresponding to a center frequency of the preset frequency band.

[0029] Compared with a current generated by a common antenna in the existing technology shown in FIG. 2, that is, currents of the second region close to the preset side of the metal floor are not all in a same direction with currents on the radiation stub, and the floor current on the metal floor has a plurality of periods. In this application, as shown in FIG. 6, because a directivity pattern of the antenna is a sum of far-field radiation electric field vectors of all excited current elements, when the radiation stub 20 includes the at least one connection portion 201 to be connected to the preset side 101 of the metal floor 10, and the electrical length of the main stub 21 is 1 / 2 wavelength corresponding to the center frequency of the preset frequency band, both the direction of the floor current i2 of the second region A2 in the preset side 101 of the metal floor 10 and a direction of an excitation current i1 on the radiation stub 20 during resonance are the first direction d1, the direction of the floor current i2 of the first region A1 in the preset side 101 of the metal floor 10 is the second direction d2, the second region A2 is a region close to the first region A1, and the second direction d2 is opposite to the first direction d1. In other words, the excitation current i1 on the radiation stub 20 is in the first direction d1, and a floor current i2 on two sides of the radiation stub 20 is in a same direction as the excitation current i1 on the radiation stub 20, and is opposite to a floor current i2 at a position corresponding to a position of the radiation stub 20. Such current distribution reduces a directivity factor after superposition of far-field radiation electric field vectors. Therefore, compared with the existing technology, the directivity factor of the antenna can be reduced, and the omnidirectionality of the antenna can be improved.

[0030] In some embodiments, the first direction is parallel to an extension direction of the radiation stub 20, that is, the excitation current is mainly conducted in the extension direction of the radiation stub 20. In some embodiments, when the radiation stub 20 includes a main stub 21, an extension direction of the main stub 21 is also the first direction, and the excitation current is conducted in the extension direction of the main stub 21, and is maintained in the first direction.

[0031] That an electrical length of the main stub 21 is 1 / 2 wavelength corresponding to the center frequency of the preset frequency band does not refer to that the electrical length of the main stub 21 is strictly 1 / 2 wavelength corresponding to the center frequency of the preset frequency band. For example, the electrical length of the main stub 21 may be (1 / 2+1 / 10) wavelength corresponding to the preset frequency band, and all of these electrical lengths may be considered as 1 / 2 wavelength corresponding to the center frequency of the preset frequency band.

[0032] As shown in FIG. 6, the feed source 30 is electrically connected to the radiation stub 20, and is configured to excite the radiation stub 20 to generate the excitation current i1 conducted in the first direction d1, where the first direction d1 may be, for example, a direction that is parallel to the preset side 101 and faces to the left from a visual angle shown in FIG. 6. The feed source 30 causes the preset side 101 of the metal floor 10 to generate the floor current i2, the direction of the floor current i2 of the first region A1 corresponding to the radiation stub 20 is the second direction d2, and the direction of the floor current i2 of the second region A2 in the preset side 101 of the metal floor 10 is the first direction d1, where the second direction d2 may be, for example, a direction that is parallel to the preset side 101 and faces to the right from the visual angle shown in FIG. 6.

[0033] In other embodiments, the first direction may alternatively be a rightward direction from the visual angle shown in FIG. 6, and the second direction may be a leftward direction from the visual angle shown in FIG. 6. It only needs to be ensured that the direction of the floor current of the first region A1 corresponding to the radiation stub 20 is the first direction, and the direction of the floor current of the second region A2 in the preset side 101 of the metal floor 10 is the second direction, where the second region A2 is a region adjacent to the first region A1, and the second direction is opposite to the first direction.

[0034] Referring to FIG. 7 and FIG. 8, FIG. 7 is a directivity pattern of an antenna when a terminal device operates in a preset frequency band according to some embodiments, and FIG. 8 is another directivity pattern of an antenna when a terminal device operates in a preset frequency band according to some embodiments. FIG. 7 may be specifically a planar graph cross-sectioned in an XOY plane of a three-dimensional directivity pattern when the terminal device operates in a preset frequency band, and FIG. 8 may be specifically a planar graph cross-sectioned in an XOZ plane of a three-dimensional directivity pattern when the terminal device operates in a preset frequency band.

[0035] As shown in FIG. 7 and FIG. 8, when the terminal device 100 operates in the preset frequency band, directivity factors in the XOY plane and the XOZ plane are 1.986 dBi. Compared with the directivity patterns in the existing technology in FIG. 3 and FIG. 4, in this application, radiation energy of the antenna is more evenly distributed in all directions, and omnidirectionality is better.

[0036] It can be seen that, after the foregoing structure is used in the terminal device 100 in this application, after the radiation stub 20 and the metal floor 10 are excited to respectively generate the excitation current i1 and the floor current i2, and the foregoing current distribution is formed, the directivity factor of the antenna can be effectively reduced, so that radiation energy in all directions is balanced, and the omnidirectionality of the antenna is improved.

[0037] In FIG. 7 and FIG. 8, an example in which the center frequency of the preset frequency band is 2.14 GHz is used for description, that is, an example in which the terminal device 100 operates at a frequency of 2.14 GHz is used for description. Clearly, in some embodiments, the preset frequency band may be another frequency band.

[0038] The metal floor 10 is at least partially made of a conductive material.

[0039] In this application, "parallel" may be completely parallel or approximately parallel. For example, when there is an angle between the two objects, and the angle is small, for example, the angle is in a range of 0 to 30°, the two objects may still be referred to as parallel.

[0040] In this application, the preset side 101 of the metal floor 10 refers to an edge region of the metal floor 10 rather than a line. In other words, that the preset side 101 of the metal floor 10 generates the floor current i2 may be that a corresponding edge region at which the preset side 101 of the metal floor 10 is located generates the floor current.

[0041] A shape of the terminal device 100 may be, but is not limited to, a shape such as a rectangle. Two adjacent sides of the rectangle may be connected by using a straight line or may be connected by using an arc for transition.

[0042] In some embodiments, as shown in FIG. 5 and FIG. 6, the shape of the terminal device 100 is a rectangle, the terminal device 100 has two opposite long sides and two opposite short sides, and the metal floor 10 is correspondingly a rectangle. The preset side 101 may be a side that is of the metal floor 10 and that is close to and parallel to the long side of the terminal device 100, or may be a side that is of the metal floor 10 and that is close to and parallel to the short side of the terminal device 100. Correspondingly, the radiation stub 20 may be disposed adjacent to the short side of the terminal device 100, or may be disposed adjacent to the long side of the terminal device 100.

[0043] That "the projection of the radiation stub 20 on the preset side 101 of the metal floor 10 is located inside the preset side 101" may be understood as that when the radiation stub 20 may be disposed adjacent to the short side of the terminal device 100, a length of the radiation stub 20 is less than a length of the short side of the terminal device 100 and a length of the preset side 101, and when the radiation stub 20 is disposed adjacent to the long side of the terminal device 100, the length of the radiation stub 20 is less than a length the long side of the terminal device 100 and the length of the preset side 101. In some embodiments, regardless of whether the radiation stub 20 is disposed adjacent to the short side or the long side of the terminal device 100, the length of the radiation stub 20 is less than the length of the short side of the terminal device 100, and is less than the length of the preset side 101.

[0044] In some embodiments, because the projection of the radiation stub 20 on the preset side 101 of the metal floor 10 is located inside the preset side 101, when the radiation stub 20 is disposed adjacent to the preset side 101 of the metal floor 10, the radiation stub 20 may be disposed at a position adjacent to a middle region of the preset side 101 as shown in FIG. 6. That the radiation stub 20 is disposed at the position adjacent to the middle region of the preset side 101 may refer to that a projection of a midpoint of the radiation stub 20 on the preset side 101 approximately coincides with a midpoint of the preset side 101, and the projection of the radiation stub 20 on the preset side 101 is located in the middle region of the preset side 101. The middle region of the preset side 101 may have a length, for example, have a length greater than or equal to the length of the radiation stub 20, and a distance between two ends of the middle region in the extension direction of the preset side 101 and a distance between two ends of the preset side 101 are approximately equal. In other embodiments, the radiation stub 20 may alternatively be disposed at a position adjacent to an edge region of the preset side 101, where the edge region refers to any region between endpoints of the preset side 101 and the middle region.

[0045] In some embodiments, a shape of the metal floor 10 may also be rectangular, a size of the metal floor is slightly less than a size of the terminal device 100, the metal floor 10 may also include two opposite short sides and two opposite long sides, the two short sides of the metal floor 10 are respectively close to the two short sides of the terminal device 100, and the two long sides of the metal floor 10 are respectively close to the two long sides of the terminal device 100. In some embodiments, when being disposed adjacent to the long side of the terminal device 100, the radiation stub 20 may be disposed at two side positions that are close to the short side and that are on the long side of the terminal device 100, so that the radiation stub 20 is also approximately disposed adjacent to the long side of the metal floor 10, and is disposed at two side positions that are close to the short side and that are on the long side of the metal floor 10, that is, is disposed adjacent to the edge region of the preset side 101. When another electronic component is disposed in the middle region of the long side of the terminal device 100, the radiation stub 20 is disposed at the two side positions that are close to the short side and that are on the long side of the terminal device 100, to avoid interference with the another electronic component, and ensure omnidirectionality of antenna radiation.

[0046] In some embodiments, the center frequency of the preset frequency band is 2.4 GHz. Because the omnidirectionality of the antenna is improved, when the terminal device communicates in the 2.4 GHz frequency band, the terminal device 100 can better receive and send an electromagnetic wave signal in all directions. A corresponding wavelength is 0.125 m when the preset frequency band is 2.4 GHz. Therefore, in this case, the electrical length of the main stub 21 is 6.25 cm.

[0047] Referring to FIG. 9 to FIG. 11, FIG. 9 is a diagram of a partial structure of a terminal device in a first specific example according to some embodiments of this application, FIG. 10 is a diagram of a partial structure of a terminal device in a second specific example according to some embodiments of this application, and FIG. 11 is a diagram of a partial structure of a terminal device in a third specific example according to some embodiments of this application.

[0048] In some embodiments, as shown in FIG. 9 to FIG. 11, the main stub 21 includes a first stub 21a and a second stub 21b, a first gap F1 exists between the first stub 21a and the second stub 21b, the first stub 21a and the second stub 21b are spaced apart from each other through the first gap F1 and are symmetrically disposed on two sides of the first gap F1, and the at least one connection portion 201 of the radiation stub 20 is one end that is of each of the first stub 21a and the second stub 21b and that is away from the first gap F1. One end that is of each of the first stub 21a and the second stub 21b and that is away from the first gap F1 is connected to the metal floor 10, the feed source 30 is electrically connected to the first stub 21a and / or the second stub 21b, and the feed source 30 is configured to excite the first stub 21a and / or the second stub 21b, so that both the first stub 21a and the second stub 21b generate the excitation current conducted in the first direction, and the first stub 21a and the second stub 21b support receiving and sending of the electromagnetic wave signal in the preset frequency band. Because a current on the antenna close to the dipole current indicates a lower the directivity factor and higher the omnidirectionality of the antenna, the first stub 21a and the second stub 21b are spaced apart from each other through the first gap and are symmetrically disposed on the two sides of the first gap F1, so that a structure of the main stub 21 is a structure of a dipole antenna, and the current generated on the main stub 21 is the dipole current, thereby leading to a lower directivity factor and higher omnidirectionality of the antenna.

[0049] As shown in FIG. 9, when the main stub 21 includes the first stub 21a and the second stub 21b, both extension directions of the first stub 21a and the second stub 21b are the first direction, and the first stub 21a and the second stub 21b are disposed spaced apart in the first direction through the first gap F1.

[0050] In some embodiments, as shown in FIG. 9, the feed source 30 is electrically connected to the first stub 21a, and the feed source 30 is configured to excite the first stub 21a to generate the excitation current conducted in the first direction, and excite, via coupling through the first gap F1, the second stub 21b to generate the excitation current conducted in the first direction. Therefore, the main stub 21 entirely presents the excitation current conducted in the first direction.

[0051] In some embodiments, as shown in FIG. 10, the feed source 30 is connected to both the first stub 21a and the second stub 21b, and the feed source 30 is configured to respectively output two feed signals having opposite phases to the first stub 21a and the second stub 21b, so that both the excitation current on the first stub 21a and the second stub 21b are conducted in the first direction. Therefore, the main stub 21 entirely presents the excitation current conducted in the first direction.

[0052] The feed source 30 has two output ends, one output end is connected to the first stub 21a, and the other output end is connected to the second stub 21b. The two output ends of the feed source 30 are configured to respectively output two feed signals having opposite phases.

[0053] A position at which the first stub 21a is connected to one output end of the feed source 30 and a position at which the second stub 21b is connected to the other output end of the feed source 30 are symmetrical about the first gap F1. For example, the two output ends of the feed source 30 may be respectively connected to a gap end of the first stub 21a and a gap end of the second stub 21b. In this case, a structure of the terminal device 100 includes a structure of a dipole antenna with intermediate feeding. Because a feed point is located at the gap end of the first stub 21a and the gap end of the second stub 21b, which is a middle position of the main stub 21, a radiation mode of the antenna is relatively symmetrical, and currents on the first stub 21a and the second stub 21b are similar or equal. Therefore, the directivity factor can be further reduced, and the omnidirectionality of the antenna can be improved.

[0054] The gap end of the first stub 21a refers to an end that is of the first stub 21a and that is close to the first gap F1, and the gap end of the second stub 21b refers to an end that is of the second stub 21b and that is close to the first gap F1.

[0055] In some embodiments, a current provided by a same feed source may be divided into two paths through a power splitter, and then one path of the current is phase-shifted by 180° through a phase splitter, to provide two feed signals having opposite phases. In some other embodiments, two feed signals having opposite phases are provided through two feed sources.

[0056] In some embodiments, as shown in FIG. 11, the feed source 30 includes a first feed source 31 and a second feed source 32, the first feed source 31 is electrically connected to the first stub 21a, the second feed source 32 is electrically connected to the second stub 21b, the first feed source 31 and the second feed source 32 respectively provide feed signals to the first stub 21a and the second stub 21b, and the feed signals provided by the first feed source 31 and the second feed source 32 have opposite phases, so that both the first stub 21a and the second stub 21b generate the excitation current conducted in the first direction. Therefore, the main stub 21 entirely presents the excitation current conducted in the first direction.

[0057] A connection portion between the first feed source 31 and the first stub 21a and a connection portion between the second feed source 32 and the second stub 21b are symmetrical about the first gap F1. In this case, symmetry of the antenna is better, and it is more beneficial to decreasing the directivity factor and improving the omnidirectionality of the antenna.

[0058] Referring to FIG. 12 to FIG. 17, FIG. 12 is a diagram of a partial structure of a terminal device in a fourth specific example according to some embodiments of this application, FIG. 13 is a diagram of a partial structure of a terminal device in a fifth specific example according to some embodiments of this application, FIG. 14 is a diagram of a partial structure of a terminal device in a sixth specific example according to some embodiments of this application, FIG. 15 is a diagram of radiation efficiency when a terminal device operates in a preset frequency band according to some embodiments of this application, FIG. 16 is a diagram of current distribution when a terminal device operates in a preset frequency band according to some embodiments of this application, FIG. 17 is a diagram of current distribution when another terminal device operates in a preset frequency band according to some embodiments of this application, and FIG. 18 is a directivity pattern of some terminal devices operating in a preset frequency band according to some embodiments of this application (FIG. 10 and FIG. 12).

[0059] In some embodiments, as shown in FIG. 12 to FIG. 14, the main stub 21 includes a first end 211 and a second end 212 that are opposite, the radiation stub 20 further includes a first parasitic stub 22a and a second parasitic stub 22b, both the first parasitic stub 22a and the second parasitic stub 22b are disposed parallel to the main stub 21, one end of the first parasitic stub 22a and one end of the second parasitic stub 22b are respectively disposed adjacent to the first end 211 and the second end 212 of the main stub 21 and have a gap with the main stub 21, the at least one connection portion 201 of the radiation stub 20 is one end that is of each of the first parasitic stub 22a and / or the second parasitic stub 22b and that is away from the main stub 21, and the other end that is of each of the first parasitic stub 22a and / or the second parasitic stub 22b is connected to the metal floor 10. As shown in FIG. 15, when operating at 2.4 GHz, the terminal device 100 having the first parasitic stub and the second parasitic stub has higher radiation efficiency. In addition, because the first parasitic stub 22a and the second parasitic stub 22b are both disposed parallel to the main stub 21, and one end of the first parasitic stub 22a and one end of the second parasitic stub 22b are respectively disposed adjacent to the first end 211 and the second end 212 of the main stub 21, an electrical length of an antenna structure can be increased, so that electric energy is dispersed, the directivity factor is reduced, and omnidirectionality of the antenna is improved. As shown in FIG. 16 and FIG. 17, an antenna structure corresponding to FIG. 16 is a structure including the main stub 21, the first parasitic stub 22a, and the second parasitic stub 22b shown in FIG. 12, and an antenna structure corresponding to FIG. 17 is a structure including the main stub 21 shown in FIG. 10. It can be seen from FIG. 16 and FIG. 17 that, when the first parasitic stub 22a and the second parasitic stub 22b are included, current distribution is more dispersed. As shown in FIG. 18, compared with an antenna structure only including the main stub 21 (FIG. 10), an antenna structure including the main stub 21, the first parasitic stub 22a, and the second parasitic stub 22b (FIG. 12) has more uniform radiation distribution in all directions of a directivity pattern corresponding to the antenna structure. Therefore, the omnidirectionality of the antenna is higher.

[0060] In some embodiments, the first parasitic stub 22a and the second parasitic stub 22b are centrally symmetrical about the main stub 21. A more symmetrical antenna structure may cause a more symmetrical excitation current, to cause a lower directivity factor and higher omnidirectionality of the antenna. Therefore, the first parasitic stub 22a and the second parasitic stub 22b are centrally symmetrical about the main stub 21, so that the directivity factor is reduced, and the omnidirectionality of the antenna is improved.

[0061] Extension directions of the first parasitic stub 22a, the second parasitic stub 22b, and the main stub 21 are all parallel to the first direction. In other words, the excitation current is mainly conducted in the extension direction of the radiation stub 20.

[0062] In some embodiments, as shown in FIG. 12 to FIG. 14, the first parasitic stub 22a, the main stub 21, and the second parasitic stub 22b are sequentially disposed spaced apart in a direction parallel to the first direction, and are approximately in a horizontal shape.

[0063] In some embodiments, as shown in FIG. 12, the main stub 21 includes a first stub 21a and a second stub 21b, a first gap F1 exists between the first stub 21a and the second stub 21b, the first stub 21a and the second stub 21b are spaced apart from each other through the first gap F1 and are symmetrically disposed on two sides of the first gap F1, end portions that are of the first stub 21a and the second stub 21b and that are away from each other are the first end 211 and the second end 212, both the first parasitic stub 22a and the second parasitic stub 22b are connected to the metal floor 10, and the feed source 30 is separately connected to the first stub 21a and the second stub 21b, and respectively outputs two feed signals having opposite phases to the first stub 21a and the second stub 21b, so that all of the first parasitic stub 22a, the first stub 21a, the second stub 21b, and the second parasitic stub 22b generate the excitation current conducted in the first direction. Therefore, the current on the entire radiation stub 20 is conducted in the first direction.

[0064] In some embodiments, as shown in FIG. 12, the first parasitic stub 22a is disposed on a side that is of the first stub 21a and that is away from the second stub 21b, the second parasitic stub 22b is disposed on a side that is of the second stub 21b and that is away from the first stub 21a, and extension directions of the first parasitic stub 22a, the first stub 21a, the second stub 21b, and the second parasitic stub 22b are all parallel to the first direction, are sequentially disposed spaced apart in a direction parallel to the first direction, and are approximately in a horizontal shape.

[0065] In some embodiments, as described above, the at least one connection portion 201 of the radiation stub 20 is one end that is of each of the first parasitic stub 22a and / or the second parasitic stub 22b and that is away from the main stub 21. When the main stub 21 includes the first stub 21a and the second stub 21b, the at least one connection portion 201 of the radiation stub 20 is one end that is of the first parasitic stub 22a and that is away from the first stub 21a and / or one end that is of the second parasitic stub 22b and that is away from the second stub 21b. As shown in FIG. 12, both one end that is of the first parasitic stub 22a and that is away from the first stub 21a and one end that is of the second parasitic stub 22b and that is away from the second stub 21b are connected to the metal floor 10.

[0066] In some embodiments, the feed source 30 respectively outputs two feed signals having opposite phases to the first stub 21a and the second stub 21b, to excite the first stub 21a and the second stub 21b to generate the excitation current conducted in the first direction, and excite, via coupling, both the first parasitic stub 22a and the second parasitic stub 22b to generate the excitation current conducted in the first direction.

[0067] In some embodiments, a position at which the feed source 30 is connected to the first stub 21a is symmetrical to a position at which the feed source 30 is connected to the second stub 21b. In this way, a radiation mode of the antenna is relatively symmetrical, and it is beneficial to reducing the directivity factor and improving the omnidirectionality of the antenna. For example, the feed source 30 is separately connected to the gap end of the first stub 21a and the gap end of the second stub 21b. The gap end of the first stub 21a refers to an end that is of the first stub 21a and that is close to the first gap F1, and the gap end of the second stub 21b refers to an end that is of the second stub 21b and that is close to the first gap F1. Because a feed point is at the gap end of the first stub 21a and the gap end of the second stub 21b, which is located at a middle position of the antenna structure, the radiation mode of the antenna is relatively symmetrical. Currents on the first stub 21a are equal to currents on the second stub 21b, and currents on the first parasitic stub 22a are equal to currents on the second parasitic stub 22b. Therefore, the directivity factor can be further reduced, and the omnidirectionality of the antenna can be improved.

[0068] In some embodiments, as shown in FIG. 13, the main stub 21 is a continuous stub, the second parasitic stub 22b is connected to the metal floor 10, the feed source 30 is electrically connected to the first parasitic stub 22a, and the feed source 30 is configured to provide a feed signal to the first parasitic stub 22a, excite the first parasitic stub 22a to generate the excitation current conducted in the first direction, and excite, via coupling through a second gap F2 between the first parasitic stub 22a and the main stub 21, the main stub 21 to generate the excitation current conducted in the first direction, and excite, via coupling through a third gap F3 between the main stub 21 and the second parasitic stub 22b, the second parasitic stub 22b to generate the excitation current conducted in the first direction, so that all of the first parasitic stub 22a, the main stub 21, and the second parasitic stub 22b generate the excitation current conducted in the first direction. Therefore, the excitation current on the entire antenna structure is conducted in the first direction, and feeding is easily performed. The feed source 30 may be disposed in a structure (such as a PCB board) in which the metal floor is located. In addition, the feed source 30 is connected to the first parasitic stub 22a through a cable, a spring sheet, or the like, and connection is easily implemented. Therefore, feeding is easily performed.

[0069] Referring to FIG. 14 and FIG. 19 to FIG. 21, FIG. 19 is a curve diagram of an S-parameter of a terminal device according to some embodiments of this application, FIG. 20 is a simulated diagram of a voltage corresponding to a midpoint of a main stub corresponding to an antenna structure in FIG. 14, and FIG. 21 is a current simulation diagram corresponding to a midpoint of a main stub corresponding to an antenna structure in FIG. 14.

[0070] In some embodiments, as shown in FIG. 14, one of the at least one connection portion 201 is a midpoint of the main stub 21, and the midpoint of the main stub 21 is connected to the metal floor 10. Therefore, electrostatic shielding can be implemented, and as shown in FIG. 19, after the midpoint of the main stub 21 is connected to the metal floor 10, effective operation can be performed in a range of 1.8 GHz to 2.4 GHz, thereby increasing a bandwidth. In addition, as shown in FIG. 20 and FIG. 21, when the antenna is operated at 2 GHz, because the midpoint of the main stub 21 is a large current point and a small voltage point, the voltage is approximately 2 V, and the current is approximately 0.1 A. Therefore, the midpoint of the main stub 21 is connected to the metal floor 10 without affecting a conduction direction of the current on the main stub 21.

[0071] Referring to FIG. 22 to FIG. 27, FIG. 22 is a diagram of a partial structure of a seventh terminal device according to some embodiments of this application, FIG. 23 is a curve diagram of an S-parameter and radiation efficiency of a terminal device according to some embodiments of this application, FIG. 24 is a diagram of a current direction when an antenna structure in FIG. 22 operates at 5 GHz, FIG. 25 is a diagram of a current direction when an antenna structure in FIG. 22 operates at 6.5 GHz, FIG. 26 shows an equivalent circuit of an antenna structure in FIG. 22 implementing dual resonance between 5 GHz and 7 GHz, and FIG. 27 is an impedance diagram when an antenna structure in FIG. 22 operates between 4 GHz and 5 GHz.

[0072] In some embodiments, as shown in FIG. 22, the metal floor 10 includes a notch M disposed in the first region A1 of the preset side 101, the notch M includes a first side S1, a second side S2, and a third side S3, one end of each of the first side S1 and the second side S2 is connected to the third side S3, the other end of each of the first side S1 and the second side S2 is connected to the preset side 101, the preset side 101 and the radiation stub 20 are on a same straight line, the first side S1 separately forms an angle with the third side S3 and the preset side 101, the second side S2 separately forms an angle with the third side S3 and the preset side 101, another one of the at least one connection portion 201 is an end portion of the second parasitic stub 22b, a fourth gap F4 exists between the first parasitic stub 22a and the first side S1, and the second parasitic stub 22b is connected to the metal floor 10. Because the fourth gap F4 exists between the first parasitic stub 22a and the first side S1, as shown in FIG. 23, in addition to operating in the 2.4 GHz frequency band, the radiation stub 20 may also operate between 5 GHz to 7 GHz frequency band in cooperation with the metal floor 10 as shown in FIG. 22 in this embodiment, and therefore may further be applied to Wi-Fi-6E and Wi-Fi 7, so that the antenna covers both Wi-Fi high and low frequencies.

[0073] As shown in FIG. 24, it may be known from the figure that, a low-frequency current between 5 GHz and 7 GHz is coupled back to ground through the second gap F2, so that a structure part through which the low-frequency current between 5 GHz and 7 GHz flows may be used as a low-frequency antenna structure between 5 GHz and 7 GHz, and resonance is in a low-frequency range between 5 GHz and 7 GHz.

[0074] As shown in FIG. 25, it may be known from the figure that, a high-frequency current between 5 GHz and 7 GHz is coupled back to ground through the fourth gap F4, so that a structure part through which the high-frequency current between 5 GHz and 7 GHz flows may be used as a high-frequency antenna structure between 5 GHz and 7 GHz, and resonance is in a high-frequency range between 5 GHz and 7 GHz.

[0075] As shown in FIG. 24 and FIG. 26, the first parasitic stub 22a in FIG. 24 may be equivalent to a first inductor L1 in FIG. 26, the second gap F2 may be equivalent to a first capacitor C1 in FIG. 26, and a part that is in the main stub 21 and that is connected to the metal floor 10 from the second gap F2 may be equivalent to a second inductor L2 in FIG. 26. Therefore, a structure part through which the low-frequency current between 5 GHz to 7 GHz flows, that is, an antenna structure that can be used as a low-frequency antenna structure between 5 GHz to 7 GHz may be equivalent to an LC resonance circuit in which the first capacitor C1, the first inductor L1, and the second inductor L2 are connected in series, and resonance can be in the low-frequency between 5 GHz to 7 GHz.

[0076] As shown in FIG. 25 and FIG. 26, the fourth gap F4 in FIG. 25 is equivalent to the second capacitor C2 in FIG. 26, and the metal floor 10 in FIG. 25 is equivalent to a third inductor L3 in FIG. 26, so that a structure part through which the high-frequency current between 5 GHz and 7 GHz flows may be used as a high-frequency antenna structure between 5 GHz to 7 GHz, and may be equivalent to an LC resonance circuit in which the second capacitor C2 and the third inductor L3 are connected in series, and resonance can be in the high-frequency between 5 GHz to 7 GHz.

[0077] As shown in FIG. 27, FIG. 27 is an impedance diagram when a radiation stub in FIG. 22 operates between 4 GHz to 5 GHz. A length of the second gap F2 between the first parasitic stub 22a and the main stub 21, or an area of a surface of the first parasitic stub 22a opposite to the main stub 21 is adjusted, to adjust a capacitance value of the first capacitor C1 equivalent to the second gap F2, to adjust a frequency corresponding to impedance in an impedance loop formed by "looping" in an impedance curve, thereby performing impedance matching, and selecting a specific frequency band to receive and send the electromagnetic wave signal. "Looping" refers to loops formed by the impedance curve in FIG. 27. These "loops" represent changes of impedance values of the antenna at different frequencies, and these loops are usually caused by an impedance mismatch between the antenna and a transmission line or a load. When the impedance is mismatched, a signal is partially reflected back to an antenna system, which causes a "loop" to be formed in an impedance plane.

[0078] A length of the fourth gap F4 between the first parasitic stub 22a and the first side S1, or an area of a surface of the first parasitic stub 22a opposite to the first side S1 is adjusted, to adjust a capacitance value of the second capacitor C2 equivalent to the fourth gap F4, to adjust a size of an impedance loop in the impedance curve, thereby changing impedance matching. Different sizes of impedance loops indicate different impedance of the antenna at different frequencies or with different electrical lengths.

[0079] In some embodiments, as shown in FIG. 12 to FIG. 14, electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b are less than or equal to 1 / 4 wavelength corresponding to the preset frequency band. Because when the electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b are greater than 1 / 4 wavelength corresponding to the preset frequency band, the current on the antenna structure cannot be entirely conducted in the first direction, resulting in an increase of the directivity factor. Therefore, the electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b being less than or equal to 1 / 4 wavelength corresponding to the preset frequency band can avoid an increase of the directivity factor.

[0080] When the preset frequency band is 2.4 GHz, a corresponding wavelength of the preset frequency band is 0.125 m. In this case, the electrical lengths of the first parasitic stub 22a and the second parasitic stub 22b are less than or equal to 3.125 cm.

[0081] In the foregoing embodiments, the descriptions of the embodiments have respective focuses. For a part that is not described in detail in an embodiment, refer to related descriptions of other embodiments. The embodiments may further be adaptively combined into other new embodiments. In addition, the embodiments described in this application are merely some but not all of the embodiments of this application. All other embodiments obtained by a person of ordinary skill in the art based on embodiments of this application without creative efforts shall fall within the protection scope of this application.

[0082] The foregoing is an implementation of embodiments of this application. It should be noted that, a person of ordinary skill in the art can further make several improvements and refinements without departing from the principle of embodiments of this application, and the improvements and refinements shall fall within the protection scope of this application.

Claims

1. A terminal device, comprising: a metal floor; a radiation stub, disposed adjacent to and parallel to a preset side of the metal floor, wherein a projection of the radiation stub on the preset side of the metal floor is located inside the preset side, the radiation stub comprises at least one connection portion, and the at least one connection portion is connected to the preset side of the metal floor; and a feed source, electrically connected to the radiation stub and configured to excite the radiation stub to generate an excitation current conducted in a first direction, to cause the radiation stub to support receiving and sending of an electromagnetic wave signal in a preset frequency band, and cause the preset side of the metal floor to generate a floor current, wherein a direction of a floor current of a first region corresponding to the radiation stub in the preset side of the metal floor is a second direction, a direction of a floor current of a second region in the preset side of the metal floor is the first direction, the second region is a region adjacent to the first region, the second direction is opposite to the first direction, the radiation stub comprises a main stub, and an electrical length of the main stub is 1 / 2 wavelength corresponding to the preset frequency band.

2. The terminal device according to claim 1, wherein a center frequency of the preset frequency band is 2.4 GHz.

3. The terminal device according to claim 1 or 2, wherein the main stub comprises a first stub and a second stub, a first gap exists between the first stub and the second stub, the first stub and the second stub are spaced apart from each other through the first gap and are symmetrically disposed on two sides of the first gap, the at least one connection portion of the radiation stub is one end that is of each of the first stub and the second stub and that is away from the first gap, and one end that is of each of the first stub and the second stub and that is away from the first gap is connected to the metal floor; and the feed source is electrically connected to the first stub and / or the second stub, and the feed source is configured to excite the first stub and / or the second stub, to cause both the first stub and the second stub to generate the excitation current conducted in the first direction, and cause the first stub and the second stub to support receiving and sending of the electromagnetic wave signal in the preset frequency band.

4. The terminal device according to claim 3, wherein the feed source is electrically connected to the first stub, and the feed source is configured to excite the first stub to generate the excitation current conducted in the first direction, and excite, via coupling through the first gap, the second stub to generate the excitation current conducted in the first direction.

5. The terminal device according to claim 3, wherein the feed source is connected to the first stub and the second stub, and the feed source is configured to respectively output two feed signals having opposite phases to the first stub and the second stub, to cause both the excitation current on the first stub and the excitation current on the second stub to be conducted in the first direction.

6. The terminal device according to claim 3, wherein the feed source comprises a first feed source and a second feed source, the first feed source is electrically connected to the first stub, the second feed source is electrically connected to the second stub, the first feed source and the second feed source respectively provide feed signals to the first stub and the second stub, and the feed signals provided by the first feed source and the second feed source have opposite phases, to cause both the first stub and the second stub to generate the excitation current conducted in the first direction.

7. The terminal device according to claim 1, wherein the main stub comprises a first end and a second end that are opposite, the radiation stub further comprises a first parasitic stub and a second parasitic stub, both the first parasitic stub and the second parasitic stub are disposed parallel to the main stub, one end of the first parasitic stub and one end of the second parasitic stub are respectively disposed adjacent to the first end and the second end of the main stub and have a gap with the main stub, the at least one connection portion of the radiation stub is one end that is of each of the first parasitic stub and / or the second parasitic stub and that is away from the main stub, and the other end that is of each of the first parasitic stub and / or the second parasitic stub is connected to the metal floor.

8. The terminal device according to claim 7, wherein the first parasitic stub and the second parasitic stub are centrally symmetrical about the main stub.

9. The terminal device according to claim 7 or 8, wherein the main stub comprises a first stub and a second stub, a first gap exists between the first stub and the second stub, the first stub and the second stub are spaced apart from each other through the first gap and are symmetrically disposed on two sides of the first gap, end portions that are of the first stub and the second stub and that are away from each other are the first end and the second end, both the first parasitic stub and the second parasitic stub are connected to the metal floor, and the feed source is separately connected to the first stub and the second stub, and respectively outputs two feed signals having opposite phases to the first stub and the second stub, to cause all of the first parasitic stub, the first stub, the second stub, and the second parasitic stub to generate the excitation current conducted in the first direction.

10. The terminal device according to claim 7 or 8, wherein the main stub is a continuous stub, the second parasitic stub is connected to the metal floor, the feed source is electrically connected to the first parasitic stub, and the feed source is configured to provide a feed signal to the first parasitic stub, excite the first parasitic stub to generate the excitation current conducted in the first direction, excite, via coupling through a second gap between the first parasitic stub and the main stub, the main stub to generate the excitation current conducted in the first direction, and excite, via coupling through a third gap between the main stub and the second parasitic stub, the second parasitic stub to generate the excitation current conducted in the first direction, to cause all of the first parasitic stub, the main stub, and the second parasitic stub to generate the excitation current conducted in the first direction.

11. The terminal device according to claim 10, wherein one of the at least one connection portion is a midpoint of the main stub, and the midpoint of the main stub is connected to the metal floor.

12. The terminal device according to claim 11, wherein the metal floor comprises a notch disposed in the first region of the preset side, the notch comprises a first side, a second side, and a third side, one end of each of the first side and the second side is connected to the third side, the other end of each of the first side and the second side is connected to the preset side, the preset side and the radiation stub are on a same straight line, the first side separately forms an angle with the third side and the preset side, the second side separately forms an angle with the third side and the preset side, the first parasitic stub is located between the main stub and the first side, the second parasitic stub is located between the main stub and the second side, another one of the at least one connection portion is an end portion of the second parasitic stub, a fourth gap exists between the first parasitic stub and the first side, and the end portion of the second parasitic stub is connected to the metal floor.

13. The terminal device according to claim 7 or 8, wherein both electrical lengths of the first parasitic stub and the second parasitic stub are less than or equal to 1 / 4 wavelength corresponding to the preset frequency band.

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