Antenna structure and electronic device

Abstract

Embodiments of this application provide an antenna structure and an electronic device. The antenna structure includes a first antenna branch, a second antenna branch, a first feed point, and a second feed point. The first feed point is electrically connected to the first antenna branch, and the second feed point is electrically connected to the second antenna branch. There is a gap between the first antenna branch and the second antenna branch. The antenna structure further includes a first matching network. One end of the first matching network is electrically connected to the first antenna branch, and the other end of the first matching network is electrically connected to a third end of the second antenna branch. In this way, radiation intensity and radiation efficiency for a low-frequency signal and a medium-high-frequency signal can be effectively improved based on a limited structure size of the antenna structure. Space occupied by the antenna structure in the electronic device is reduced, and appropriateness of arrangement of the antenna structure in the electronic device is effectively improved, which meets design requirements of a low-frequency antenna and a medium-high-frequency antenna in the electronic device.

Description

[0001] This application claims priorities to Chinese Patent Application No. 202310478403.6, filed with the China National Intellectual Property Administration on April 26, 2023 and entitled "ANTENNA STRUCTURE AND ELECTRONIC DEVICE", and to Chinese Patent Application No. 202311590727.5, filed with the China National Intellectual Property Administration on November 24, 2023 and entitled "ANTENNA STRUCTURE AND ELECTRONIC DEVICE", both of which are incorporated herein by reference in their entireties.TECHNICAL FIELD

[0002] This application relates to the field of electronic technologies, and in particular, to an antenna structure and an electronic device.BACKGROUND

[0003] An antenna is a device that performs energy conversion and directionally radiates or receives an electromagnetic wave in wireless communication. The antenna is widely used in engineering systems such as a radio communication system, a broadcasting system, a radar system, a navigation system, and a remote sensing system. For example, the antenna is used in an electronic device like a mobile phone, a notebook computer, a tablet computer, a netbook, or a wearable device, and the electronic device may transmit a signal through the antenna.

[0004] The mobile phone is used as an example. In a communication process, signals transmitted by the electronic device usually include a medium-high-frequency signal and a low-frequency signal. A size of the antenna is related to a wavelength of the signal. For example, a wavelength of the medium-high-frequency signal is short, and a required antenna size is also small, while a wavelength of the low-frequency signal is long, and a required antenna size is large. However, with development of an increasingly light and thin design of an electronic device appearance, space for disposing the antenna in the electronic device is increasingly compact. Therefore, it is difficult to effectively meet a design requirement of a low-frequency band antenna.SUMMARY

[0005] This application provides an antenna structure and an electronic device, to resolve a problem that space in an existing electronic device is compact and it is difficult to effectively meet a design requirement of a low-frequency signal antenna.

[0006] A first aspect of this application provides an antenna structure, including a first antenna branch, a second antenna branch, a first feed point, and a second feed point.

[0007] The first antenna branch has a first end and a second end that are opposite to each other, and the second antenna branch has a third end and a fourth end that are opposite to each other.

[0008] The first feed point is electrically connected to the first antenna branch, and the second feed point is electrically connected to the second antenna branch.

[0009] There is a gap between the second end of the first antenna branch and the third end of the second antenna branch.

[0010] The antenna structure further includes a first matching network. One end of the first matching network is electrically connected to the second end of the first antenna branch, and the other end of the first matching network is electrically connected to the third end of the second antenna branch.

[0011] The first matching network can tune signal transmission between the first antenna branch and the second antenna branch. When the first feed point feeds a low-frequency signal into the first antenna branch, the low-frequency signal on the first feed point can flow into the second antenna branch through the first matching network, and be radiated to the outside by using the first antenna branch and the second antenna branch. In this way, the first antenna branch can extend, by using a length of the second antenna branch, an antenna length required for radiating the low-frequency signal, so that the antenna structure can better radiate the low-frequency signal. In this way, radiation intensity and radiation efficiency for the low-frequency signal and a medium-high-frequency signal can be effectively improved based on a limited structure size of the antenna structure. Space occupied by the antenna structure in an electronic device is reduced, a spatial layout of the electronic device is effectively utilized on a premise of meeting a light and thin design of the electronic device, and appropriateness of arrangement of the antenna structure in the electronic device is improved, which effectively meets design requirements of a low-frequency antenna and a medium-high-frequency antenna in the electronic device.

[0012] In addition, in the antenna structure provided in this application, no filter structure needs to be disposed on branches of the first feed point and the second feed point, and no loss is caused to respective signals of the first feed point and the second feed point. This can effectively improve radiation efficiency for a signal and improve radiation intensity of the antenna structure. In addition, tuning of signal transmission between the first antenna branch and the second antenna branch is implemented by the first matching network. This can implement tuning of any capacitance, and can implement tuning, of a signal in a wider frequency range, for the antenna structure. Therefore, the antenna structure can radiate a signal in a wider frequency band.

[0013] In a possible implementation, the antenna structure further includes a second matching network. One end of the second matching network is electrically connected to the second end of the first antenna branch, and the other end of the second matching network is grounded. The second matching network can improve overall impedance of the first antenna branch. This can achieve a requirement of radiating the low-frequency signal when a size of the first antenna branch is reduced, which reduces space occupied by the first antenna branch. In addition, this can improve the overall impedance of the first antenna branch, to meet radiation for the low-frequency signal.

[0014] In a possible implementation, the antenna structure further includes a third matching network. One end of the third matching network is electrically connected to the third end of the second antenna branch, and the other end of the third matching network is grounded. The third matching network can improve overall impedance of the second antenna branch. This can achieve a requirement of radiating the medium-high-frequency signal when a size of the second antenna branch is reduced, which reduces space occupied by the second antenna branch. In addition, this can improve the overall impedance of the second antenna branch, to meet radiation for the medium-high-frequency signal.

[0015] In a possible implementation, the antenna structure further includes a third antenna branch. One end of the third antenna branch is electrically connected to the fourth end of the second antenna branch, and the other end of the third antenna branch is grounded.

[0016] In a possible implementation, the antenna structure further includes a fourth matching network. One end of the fourth matching network is electrically connected to the fourth end of the second antenna branch, and the other end of the fourth matching network is grounded.

[0017] In a possible implementation, the antenna structure further includes a fifth matching network. One end of the fifth matching network is electrically connected to the second antenna branch, the other end of the fifth matching network is electrically connected to the second feed point, and the second feed point is electrically connected to the second antenna branch through the fifth matching network.

[0018] In a possible implementation, the antenna structure further includes a fourth antenna branch. One end of the fourth antenna branch is connected to the first end of the first antenna, and the other end of the fourth antenna branch is grounded. The fourth antenna branch can extend a length of the first antenna branch, so that the first antenna branch can better radiate the low-frequency signal. This helps increase a frequency range of a signal that can be radiated by the antenna structure, and improve bandwidth of the antenna structure.

[0019] In a possible implementation, the first matching network includes a first circuit. The first circuit includes at least one of a first inductor and a first capacitor. The first circuit can adjust a total reactance value of the first matching network, so that the first matching network can implement a plurality of types of capacitance values and inductance values. In this way, the first matching network can implement tuning of a signal in a wider frequency range, and the antenna structure can radiate a signal in a wider frequency band range, which effectively improves radiation performance of the antenna structure.

[0020] In a possible implementation, the first matching network further includes a second circuit. The second circuit is connected in series to the first circuit. Alternatively, the second circuit is connected in parallel to the first circuit. The second circuit can adjust a total reactance value of the first matching network on a basis of the first circuit, so that the first matching network can implement a wider range of capacitance values and inductance values. In this way, the first matching network can implement tuning of a signal in a wider frequency range, and the antenna structure can radiate a signal in a wider frequency band range, which effectively improves radiation performance of the antenna structure.

[0021] In a possible implementation, the second circuit includes at least one of a second inductor and a second capacitor. In this way, a value in a wider range can be achieved for reactance of the second circuit, and effect of adjusting the first matching network by the second circuit can be effectively improved.

[0022] In a possible implementation, the first matching network has a low-pass high-stop mode.

[0023] In a possible implementation, the first matching network is the first inductor.

[0024] Alternatively, the first matching network includes the first inductor and the first capacitor. The first inductor is connected in series to the first capacitor, and a capacitance value of the first capacitor is greater than 1 pF.

[0025] Alternatively, the first matching network includes the first inductor and the first capacitor. The first inductor is connected in parallel to the first capacitor, and a capacitance value of the first capacitor is less than 1 pF.

[0026] In a possible implementation, the first circuit includes the first inductor and the first capacitor. The first inductor is connected in parallel to the first capacitor, and a capacitance value of the first capacitor is less than 1 pF.

[0027] The second circuit is connected in series to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is greater than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is less than 10 nH.

[0028] In a possible implementation, the first circuit includes the first inductor and the first capacitor. The first inductor is connected in series to the first capacitor, and a capacitance value of the first capacitor is greater than 1 pF.

[0029] The second circuit is connected in parallel to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is less than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is greater than 10 nH.

[0030] In a possible implementation, the first matching network has a band-pass mode, and the first inductor and the first capacitor in the first matching network satisfy the following formula: f = 1 / 2 π LC

[0031] f represents a frequency of a signal, L represents an inductance value of the first inductor in the first matching network, and C represents a capacitance value of the first capacitor in the first matching network.

[0032] In a possible implementation, the first matching network includes the first inductor and the first capacitor. The first inductor is connected in series to the first capacitor.

[0033] In a possible implementation, the first circuit includes the first inductor and the first capacitor. The first inductor is connected in parallel to the first capacitor.

[0034] The second circuit is connected in series to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is greater than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is less than 10 nH.

[0035] In a possible implementation, the first circuit includes the first inductor and the first capacitor. The first inductor is connected in series to the first capacitor.

[0036] The second circuit is connected in parallel to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is less than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is greater than 10 nH.

[0037] In a possible implementation, the first matching network is a variable capacitor or a switch component.

[0038] In a possible implementation, the switch component includes at least a first path and a second path that are connected in parallel.

[0039] When the first matching network is in a low-pass high-stop mode, the first path is connected, and the second path is disconnected.

[0040] When the first matching network is in a band-pass mode, the second path is connected, and the first path is disconnected.

[0041] In a possible implementation, the second matching network includes at least one of a third inductor and a third capacitor. This can increase a reactance value range of the second matching network, which helps improve auxiliary effect of the second matching network on the first matching network, further improves a range of a signal that is on the first antenna branch and that can be tuned by the first matching network, and further improves tuning effect of the antenna structure on the low-frequency signal.

[0042] In a possible implementation, the third matching network includes at least one of a fourth inductor and a fourth capacitor. In this way, a reactance value range of the third matching network can be increased, which helps improve auxiliary effect of the third matching network on the first matching network, further improves a range of a signal that is on the second antenna branch and that can be tuned by the first matching network, and improves tuning effect of the antenna structure on the high-frequency signal.

[0043] In a possible implementation, the first antenna branch and the second antenna branch are sequentially arranged head to tail in a same direction, the second end of the first antenna branch faces the second antenna branch, and the third end of the second antenna branch faces the first antenna branch. This can reduce or avoid warping or falling off of the first antenna branch and the antenna structure, and helps improve reliability and stability of disposing a first antenna structure and a second antenna structure in the electronic device.

[0044] A second aspect of this application provides an electronic device, including a middle frame and any one of the foregoing antenna structures. The antenna structure is located on the middle frame.

[0045] In a possible implementation, the middle frame includes a first metal side frame and a second metal side frame that are spaced apart from each other.

[0046] The first metal side frame forms the first antenna branch of the antenna structure, and the second metal side frame forms the second antenna branch of the antenna structure.

[0047] In a possible implementation, when the first matching network is the variable capacitor, the electronic device includes a processor and a controller.

[0048] The processor is electrically connected to the controller, and the controller is electrically connected to the variable capacitor. The processor is configured to send a control signal to the controller according to a received switching instruction. The controller is configured to switch a capacitance value of the variable capacitor based on the received control signal.

[0049] In a possible implementation, when the first matching network is the switch component, the electronic device includes a processor.

[0050] The processor is electrically connected to the switch component. The processor is configured to send a control signal to the switch component according to a received switching instruction, and the switch component is configured to switch a path of the switch component based on the received control signal.BRIEF DESCRIPTION OF DRAWINGS

[0051] FIG. 1 is a diagram of a structure of an electronic device according to an embodiment of this application; FIG. 2 is an exploded view of an electronic device according to an embodiment of this application; FIG. 3 is a diagram of a structure of an antenna structure in a related technology; FIG. 4 is a diagram of a structure of an antenna structure in another related technology; FIG. 5 is a diagram of a first structure of an antenna structure according to an embodiment of this application; FIG. 5A is a diagram of a second structure of an antenna structure according to an embodiment of this application; FIG. 5B is a diagram of a third structure of an antenna structure according to an embodiment of this application; FIG. 6 is a diagram of a fourth structure of an antenna structure according to an embodiment of this application; FIG. 7 is a diagram of a first structure of a first matching network according to an embodiment of this application; FIG. 8 is a diagram of a second structure of a first matching network according to an embodiment of this application; FIG. 9 is a diagram of a third structure of a first matching network according to an embodiment of this application; FIG. 10 is a diagram of a fourth structure of a first matching network according to an embodiment of this application; FIG. 11 is a diagram of a fifth structure of a first matching network according to an embodiment of this application; FIG. 12 is a diagram of a sixth structure of a first matching network according to an embodiment of this application; FIG. 13 is a diagram of a seventh structure of a first matching network according to an embodiment of this application; FIG. 14 is a diagram of an eighth structure of a first matching network according to an embodiment of this application; FIG. 14A is a diagram of a ninth structure of a first matching network according to an embodiment of this application; FIG. 14B is a diagram of control logic according to an embodiment of this application; FIG. 14C is a diagram of other control logic according to an embodiment of this application; FIG. 15 is a diagram of efficiency for a low-frequency signal when a first matching network is not disposed in an antenna structure according to an embodiment of this application; FIG. 16 is a diagram of efficiency for a low-frequency signal after a first matching network is disposed in an antenna structure according to an embodiment of this application; FIG. 17 is a diagram of efficiency for a medium-high-frequency signal after a first matching network is disposed in an antenna structure according to an embodiment of this application; FIG. 18 is a current distribution diagram when a signal is fed into a first feed point of an antenna structure according to an embodiment of this application; and FIG. 19 is a current distribution diagram when a signal is fed into a second feed point of an antenna structure according to an embodiment of this application. Description of reference numerals:

[0052] 100: electronic device; 110: middle frame; 111: metal side frame; 112: metal middle plate; 120: display; 130: rear cover; 140: processor; 150: controller; 200: antenna structure; 210: first antenna branch; 211: first end; 212: second end; 213: fourth antenna branch; 220: second antenna branch; 221: third end; 222: fourth end; 223: ground point; 224: third antenna branch; 230: first feed point; 240: second feed point; 241: fifth matching network; 250: gap; 260: first matching network; 261: first circuit; 2611: first inductor; 2612: first capacitor; 262: second circuit; 270: second matching network; 280: third matching network; and 290: fourth matching network. DESCRIPTION OF EMBODIMENTS

[0053] Terms used in implementations of this application are only used to explain specific embodiments of this application, but are not intended to limit this application.

[0054] An embodiment of this application provides an antenna structure and an electronic device that includes the antenna structure. The electronic device may be an electronic device with an antenna, such as a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (ultra-mobile personal computer, UMPC), a handheld computer, an intercom, a netbook, a POS machine, a personal digital assistant (personal digital assistant, PDA), a wearable device, a virtual reality device, or a vehicle-mounted apparatus.

[0055] In embodiments of this application, an example in which the electronic device is a mobile phone is used. The mobile phone may be a bar-type phone, or the mobile phone may be a foldable phone. Specifically, the following uses an example in which the electronic device is the bar-type phone for description.

[0056] FIG. 1 is a diagram of a structure of the electronic device according to an embodiment of this application. FIG. 2 is an exploded view of the electronic device according to an embodiment of this application.

[0057] With reference to FIG. 1 and FIG. 2, the electronic device 100 may include a middle frame 110, a display 120, and a rear cover 130. The middle frame 110 may be located between the display 120 and the rear cover 130. For example, the display 120 and the rear cover 130 may be respectively disposed on two opposite sides of the middle frame 110. The middle frame 110 may be configured to support and carry the display 120. The display 120 may be configured to display an image, for example, may display status information, battery level information, time, a video, a picture, and an SMS message of the electronic device 100. The rear cover 130 may package devices inside the electronic device 100, so that the electronic device 100 is integrated into a whole.

[0058] An antenna structure 200 may be configured to transmit and receive signals for the electronic device 100, so that the electronic device 100 can implement communication. For example, the antenna structure 200 may be disposed on a housing of the electronic device 100. For example, the middle frame 110 of the electronic device 100 may include metal side frames 111, and the metal side frames 111 may form the antenna structure 200 to transmit a signal. Currently, in a communication process, signals transmitted by the electronic device 100 usually include a medium-high-frequency signal and a low-frequency signal. A size of the antenna is related to a wavelength of the signal. For example, a wavelength of the medium-high-frequency signal is short, and a required antenna size is also small, while a wavelength of the low-frequency signal is long, and a required antenna size is large. In this way, an antenna that is of a small size and that is used to transmit a high-frequency signal needs to be disposed in the electronic device 100, and an antenna of a large size also needs to be disposed. However, with development of an increasingly light and thin design of an electronic device appearance, space for disposing the antenna in the electronic device is increasingly compact. Therefore, it is difficult to well meet a design requirement of a low-frequency band antenna.

[0059] FIG. 3 is a diagram of a structure of an antenna structure in a related technology.

[0060] In a related technology, with reference to FIG. 3, an antenna structure 1 is provided. The antenna structure 1 includes a first antenna branch 11, a second antenna branch 12, and a first feed point 13 and a second feed point 14 that are electrically connected to the first antenna branch 11 and the second antenna branch 12 respectively. The first feed point 13 is configured to feed a medium-high-frequency signal into the first antenna branch 11, so that the medium-high-frequency signal on the first feed point 13 may be radiated to the outside by using the first antenna branch 11. The second feed point 14 is configured to feed a low-frequency signal into the second antenna branch 12, so that the low-frequency signal on the second feed point 14 can be radiated to the outside by using the second antenna branch 12. However, in the antenna structure 1, the second antenna branch 12 occupies a parasitic length of the first antenna branch 11. The two antenna branches are difficult to be well compatible with each other, and affect performance of each other. In other words, when performance of the first antenna branch 11 is good, performance of the second antenna branch 12 is greatly reduced. On the contrary, when performance of the second antenna branch 12 is good, performance of the first antenna branch 11 is greatly reduced. Therefore, overall radiation performance of the antenna structure 1 is reduced.

[0061] FIG. 4 is a diagram of a structure of an antenna structure in another related technology.

[0062] In another related technology, with reference to FIG. 4, an antenna structure 2 in which a low-frequency antenna and a high-frequency antenna are integrated is provided, to reduce an overall size of the antenna. The antenna structure 2 includes an antenna branch 21. One end of the antenna branch 21 is grounded, and a first feed branch 22 and a second feed branch 23 are disposed at the other end. The first feed branch 22 is configured to feed a medium-high-frequency signal, and the second feed branch 23 is configured to feed a low-frequency signal. A filter structure 24 is further disposed on the antenna branch 21. The filter structure 24 is configured to allow a high-frequency signal to pass through but block the low-frequency signal. In this way, the high-frequency signal fed by the first feed branch 22 flows through and is radiated to the outside, while the low-frequency signal flows into the other end of the antenna branch 21, and flows into a ground point at the other end of the antenna branch 21, to radiate the low-frequency signal. In the antenna structure 200, the low-frequency antenna and the high-frequency antenna are disposed in the same antenna branch 21, and form respective resonance of the low-frequency antenna and the high-frequency antenna in different returning manners.

[0063] A first band-stop structure 24 and a second band-stop structure 25 are further disposed on the first feed branch 22 and the second feed branch 23 respectively. The first band-stop structure 24 on the first feed branch 22 is configured to prevent the low-frequency signal on the second feed branch 23 from flowing into the first feed branch 22. On the contrary, the second band-stop structure 25 on the second feed branch 23 is configured to prevent the high-frequency signal on the first feed branch 22 from flowing into the second feed branch 23.

[0064] However, in the antenna structure 2, a distance between the first feed branch 22 and the second feed branch 23 is short, and the first band-stop structure 24 and the second band-stop structure 25 that are disposed on the first feed branch 22 and the second feed branch 23 usually include a plurality of inductors and capacitors, to implement band-stop effect. Insertion losses of the inductors and the capacitors are great. Therefore, in a working process of the antenna structure 2, the first band-stop structure 24 on the first feed branch 22 causes a great loss for the low-frequency signal on the first feed branch 22. Correspondingly, the second band-stop structure 25 on the second feed branch 23 causes a great loss for the high-frequency signal on the second feed branch 23, which greatly reduces signal radiation efficiency.

[0065] In still another related technology, to improve performance of a low-frequency antenna in the electronic device, an antenna structure is designed. The antenna structure includes a high-frequency antenna and a low-frequency antenna. A slot used for feeding through coupling is provided between the low-frequency antenna and the high-frequency antenna. The low-frequency antenna is coupled, for feeding, to the high-frequency antenna through the slot, to generate low-frequency resonance to implement transmission of a low-frequency signal. In the antenna structure, the slot between the low-frequency antenna and the high-frequency antenna is equivalent to a series capacitor, so that the antenna structure as a whole is a coupled antenna.

[0066] However, capacitance is related to a size of the slot. To be specific, a larger slot indicates smaller capacitance. On the contrary, a smaller slot indicates larger capacitance. In this way, in a design process, based on a frequency band range of a coupled signal, required capacitance is different, and a corresponding slot size is also different. When the slot becomes larger and the capacitance becomes smaller, if a frame of the electronic device is a plastic frame, an excessively large slot may cause a shrinkage phenomenon for the plastic frame, which affects an appearance of the electronic device. However, when the frame of the electronic device is a metal side frame, the excessively large slot still affects the appearance of the electronic device, which reduces aesthetics of the electronic device. When the slot becomes smaller and the capacitance becomes larger, it is difficult to form an excessively small slot in a process. Therefore, in the foregoing solution, the slot is provided between two antennas to implement a coupling capacitor, and capacitance of the coupling capacitor can only be limited in a limited range. Correspondingly, a frequency band of a signal that can be tuned by the capacitor is also limited in a limited range, and it is difficult to implement tuning of a signal in a wider frequency band range.

[0067] To resolve the foregoing problem, researchers think of improving the antenna structure. A first matching network is disposed between a first antenna branch and a second antenna branch, so that signal transmission between the first antenna branch and the second antenna branch can be tuned. In this way, a plurality of different transmission states can be implemented for signal transmission between the first antenna branch and the second antenna branch, and tuning of a signal in a wider frequency band range can be further effectively implemented. Therefore, the electronic device can implement signal transmission in a wider frequency band in effective space.

[0068] The following describes in detail an antenna structure in embodiments of this application with reference to the accompanying drawings.

[0069] FIG. 5 is a diagram of a first structure of the antenna structure according to an embodiment of this application.

[0070] With reference to FIG. 5, an embodiment of this application provides an antenna structure 200. The antenna structure 200 may include a first antenna branch 210, a second antenna branch 220, a first feed point 230, and a second feed point 240. The first antenna branch 210 has a first end 211 and a second end 212 that are opposite to each other, and the second antenna branch 220 has a third end 221 and a fourth end 222 that are opposite to each other.

[0071] The first antenna branch 210 may be electrically connected to the first feed point 230. For example, the first feed point 230 may be electrically connected to the first end 211 of the first antenna branch 210. Alternatively, the first feed point 230 may be electrically connected to any location between the first end 211 and the second end 212 of the first antenna branch 210. For example, the first feed point 230 may be electrically connected to the first antenna branch 210 through a metal spring, or the first feed point 230 may be electrically connected to the first antenna branch 210 through welding. Alternatively, in some examples, the first feed point 230 may be electrically connected to the first antenna branch 210 through electrical coupling. The first feed point 230 may feed or input power to the first antenna branch 210, so that a signal on the first feed point 230 may be transmitted to the first antenna branch 210, and be radiated to the outside by using the first antenna branch 210. For example, the signal may be an electromagnetic wave signal.

[0072] For example, the first feed point 230 may be electrically connected to a radio frequency unit (not shown in the figure) in the electronic device 100, and a signal transmitted by the radio frequency unit may be transmitted to the first feed point 230. Then, the signal is transmitted to the first antenna branch 210 through the first feed point 230.

[0073] The second feed point 240 may be electrically connected to the second antenna branch 220. For example, the second feed point 240 may be electrically connected to the fourth end 222 of the second antenna branch 220, or the second feed point 240 may be electrically connected to any location between the third end 221 and the fourth end 222 of the second antenna branch 220. For example, the second feed point 240 may also be electrically connected to the second antenna branch 220 through a metal spring plate, welding, or electrical coupling. The second feed point 240 may feed or input power to the second antenna branch 220, so that a signal on the second feed point 240 may be transmitted to the second antenna branch 220, and be radiated to the outside by using the second antenna branch 220. For example, the second feed point 240 may also be electrically connected to the radio frequency unit in the electronic device 100, so that the signal transmitted by the radio frequency unit may be transmitted to the second feed point 240, and then be transmitted to the second antenna branch 220 through the second feed point 240.

[0074] The first feed point 230 may be a feed point for a low-frequency signal. In other words, a low-frequency signal transmitted in the radio frequency unit may be fed into the first antenna branch 210 through the first feed point 230. The second feed point 240 may be a feed point for a medium-high-frequency signal. In other words, a high-frequency signal transmitted in the radio frequency unit may be fed into the second antenna branch 220 through the second feed point 240. For example, a frequency band of a signal fed by the first feed point 230 may be an L1 frequency band (a frequency of 1.57542 GHz), an L5 frequency band (a frequency of 1176.45±1.023 MHz), an N28 frequency band (a frequency from 703 MHz to 748 MHz), an N71 frequency band (a frequency from 617 MHz to 698 MHz), 400 MHz, 1.17 GHz, an N5 frequency band (a frequency from 824 MHz to 849 MHz), or an N8 frequency band (a frequency from 880 MHz to 915 MHz). A frequency band of a signal fed by the second feed point 240 may be MHB (a frequency from 1.7 GHz to 2.7 GHz), 5 GHz, Wi-Fi 6E (a frequency of 6 GHz), or NR.

[0075] It should be noted that the first end 211 and the second end 212 of the first antenna branch 210, and the third end 221 and the fourth end 222 of the second antenna branch 220 cannot be understood as points in a narrow sense. The end may also be considered as a segment of antenna branch that is on the antenna branch and that includes one end of the endpoint.

[0076] With reference to FIG. 5, there may be a gap 250 between the second end 212 of the first antenna branch 210 and the third end 221 of the second antenna branch 220. For example, the first antenna branch 210 and the second antenna branch 220 may be frames of the electronic device 100, and the first antenna branch 210 and the second antenna branch 220 may enclose a periphery of the electronic device 100. For example, the middle frame 110 of the electronic device 100 may include a first metal side frame and a second metal side frame that are spaced apart from each other. The first metal side frame may form the first antenna branch 210, and the second metal side frame may form the second antenna branch 220.

[0077] Alternatively, the frame of the electronic device 100 may be a plastic frame. A metal strip may be disposed in the plastic frame. The metal strip may form the first antenna branch 210 and the second antenna branch 220, to radiate a signal.

[0078] Alternatively, in some examples, the first antenna branch 210 and the second antenna branch 220 may be flexible printed circuit (Flexible Printed Circuit, FPC for short) structures in the electronic device 100.

[0079] The antenna structure 200 may further include a first matching network 260. One end of the first matching network 260 may be electrically connected to the second end 212 of the first antenna branch 210, and the other end of the first matching network 260 may be electrically connected to the third end 221 of the second antenna branch 220. The first matching network 260 may tune signal transmission between the first antenna branch 210 and the second antenna branch 220.

[0080] For example, in some examples, in a working process of the antenna structure 200, after passing through the first antenna branch 210, a low-frequency signal on the first feed point 230 may be transmitted to the second antenna branch 220 through the first matching network 260, and be radiated to the outside by using the second antenna branch 220. In this way, an antenna length required for radiating the low-frequency signal may be extended, so that the first antenna branch 210 and the second antenna branch 220 may be used as a whole to radiate the low-frequency signal to the outside. On the contrary, the first matching network 260 may further block a medium-high-frequency signal on the second feed point 240 from being transmitted to the first antenna branch 210, so that the second antenna branch 220 serves as an antenna for the medium-high-frequency signal to radiate the medium-high-frequency signal to the outside. In other words, in this mode, the first matching network 260 may allow the low-frequency signal on the first feed point 230 to pass through, and has interception and blocking effect on the medium-high-frequency signal on the second feed point 240. The mode that the first matching network 260 is in may be referred to as a low-pass high-stop mode. In other words, the first matching network 260 may allow the low-frequency signal to pass through but block the high-frequency signal. For example, in this mode, the first matching network 260 may be an inductor. Alternatively, the first matching network 260 may be a combination of an inductor and a capacitor in a plurality of forms, and a circuit obtained after the inductor and the capacitor are combined is inductive. For example, the capacitor and the inductor may be combined in any one of combination forms in FIG. 9, FIG. 10, FIG. 11, and FIG. 14.

[0081] Alternatively, in some examples, the first matching network 260 may block the low-frequency signal on the first feed point 230, to prevent the low-frequency signal on the first feed point 230 from being transmitted to the second antenna branch 220, and allow the medium-high-frequency signal on the second feed point 240 to be transmitted to the first antenna branch 210 through the first matching network 260. In this way, the medium-high-frequency signal on the second feed point 240 may be radiated to the outside by using the second antenna branch 220 and the first antenna branch 210. In other words, in this mode, the first matching network 260 may allow the medium-high-frequency signal on the second feed point 240 to pass through, and has interception and blocking effect on the low-frequency signal on the first feed point 230. The mode that the first matching network 260 is in may be referred to as a high-pass low-stop mode. In other words, the first matching network 260 may allow the high-frequency signal to pass through but block the low-frequency signal. For example, in this mode, the first matching network 260 may be a capacitor. Alternatively, the first matching network 260 may be a combination of an inductor and a capacitor in a plurality of forms, and a circuit obtained after the inductor and the capacitor are combined is capacitive. For example, the capacitor and the resistor may be combined in any one of combination forms in FIG. 9, FIG. 10, FIG. 11, and FIG. 14.

[0082] Alternatively, in some examples, the first matching network 260 may allow a signal on the first feed point 230 to be transmitted to the second antenna branch 220 after passing through the first antenna branch 210. In this way, the signal on the first feed point 230 can be radiated to the outsides by using the first antenna branch 210 and the second antenna branch 220. In addition, the first matching network 260 further allows the medium-high-frequency signal on the second feed point 240 to be transmitted to the first antenna branch 210 after passing through the second antenna branch 220. In this way, the medium-high-frequency signal on the second feed point 240 may also be radiated to the outside by using the second antenna branch 220 and the first antenna branch 210. In other words, in this mode, both the low-frequency signal on the first feed point 230 and the high-frequency signal on the second feed point 240 may pass through the first matching network 260. The mode that the first matching network 260 is in may be referred to as a band-pass mode. In other words, the first matching network 260 may allow both the low-frequency signal and the high-frequency signal to pass through. For example, in this mode, the first matching network 260 may be a combination of a capacitor and an inductor in a plurality of forms. For example, the capacitor and the inductor may be combined in any one of combination forms in FIG. 9, FIG. 11, and FIG. 14.

[0083] Alternatively, in some examples, the first matching network 260 may block signals on both the first antenna branch 210 and the second antenna branch 220 from being transmitted to each other. For example, the first matching network 260 may block the signal on the first feed point 230 from passing through the second antenna branch 220, and may further block the signal on the second feed point 240 from passing through the first antenna branch 210. In this case, the signal on the first feed point 230 is radiated to the outside only by using the first antenna branch 210, and the signal on the second feed point 240 is radiated to the outside only by using the second antenna branch 220. In other words, in this mode, the first matching network 260 may have interception and blocking effect on both the low-frequency signal on the first feed point 230 and the medium-high-frequency signal on the second feed point 240. The mode that the first matching network 260 is in may be referred to as a band-stop mode. In other words, the first matching network 260 may block both the low-frequency signal and the high-frequency signal. For example, in this mode, the first matching network 260 may be a combination of a capacitor and an inductor in a plurality of forms. For example, the capacitor and the inductor may be combined in any one of combination forms in FIG. 10, FIG. 11, and FIG. 14.

[0084] In this embodiment of this application, the first matching network 260 tunes signal transmission between the first antenna branch 210 and the second antenna branch 220. When the first feed point 230 feeds the low-frequency signal into the first antenna branch 210, the low-frequency signal on the first feed point 230 can flow into the second antenna branch 220 through the first matching network 260, and be radiated to the outside by using the first antenna branch 210 and the second antenna branch 220. In this way, the first antenna branch 210 can extend, by using a length of the second antenna branch 220, an antenna length required for radiating the low-frequency signal, so that the antenna structure 200 can better radiate the low-frequency signal. In this way, radiation intensity and radiation efficiency for the low-frequency signal and the medium-high-frequency signal can be effectively improved based on a limited structure size of the antenna structure 200. Space occupied by the antenna structure 200 in the electronic device 100 is reduced, a spatial layout of the electronic device 100 is effectively utilized on a premise of meeting a light and thin design of the electronic device 100, and appropriateness of arrangement of the antenna structure 200 in the electronic device 100 is improved, which effectively meets design requirements of a low-frequency antenna and a medium-high-frequency antenna in the electronic device 100.

[0085] Compared with the antenna structure 1 in the first related technology, in the antenna structure 200 provided in this embodiment of this application, when the first matching network 260 allows the low-frequency signal to pass through but blocks the high-frequency signal, a low-frequency aperture may be increased, to improve radiation efficiency for the low-frequency signal. When the first matching network 260 allows both the low-frequency signal and the high-frequency signal to pass through, the first antenna branch 210 and the second antenna branch 220 can achieve better coupling effect. However, when the first matching network blocks both the low-frequency signal and the high-frequency signal, the low-frequency signal on the first antenna branch 210 and the high-frequency signal on the second antenna branch 220 may not interfere with each other, and a better signal isolation degree is achieved, which effectively improves overall radiation efficiency of the antenna structure 200.

[0086] Compared with the antenna structure 2 in which the low-frequency antenna and the high-frequency antenna are integrated and that is provided in another related technology, in the antenna structure 200 provided in this embodiment of this application, no band-stop structure needs to be disposed on branches of the first feed point 230 and the second feed point 240, and no loss is caused to respective signals of the first feed point 230 and the second feed point 240. This can effectively improve radiation efficiency for a signal and improve radiation intensity of the antenna structure 200.

[0087] Compared with the antenna structure in which the slot used for feeding through coupling is disposed between the low-frequency antenna and the high-frequency antenna and that is provided in still another related technology, in this embodiment of this application, tuning of signal transmission between the first antenna branch 210 and the second antenna branch 220 is implemented by the first matching network 260. This can implement tuning of any capacitance, and can implement tuning, of a signal in a wider frequency range, for the antenna structure 200. Therefore, the antenna structure 200 can radiate a signal in a wider frequency band.

[0088] Still with reference to FIG. 5, in this embodiment of this application, the first antenna branch 210 and the second antenna branch 220 may be sequentially arranged head to tail in a same direction, the second end 212 of the first antenna branch 210 faces the second antenna branch 220, and the third end 221 of the second antenna branch 220 faces the first antenna branch 210. For example, the first antenna branch 210 and the second antenna branch 220 may be the metal side frames 111 located on peripheral side edges of the electronic device 100. For example, the first antenna branch 210 and the second antenna branch 220 may be located on the side edges that are of the electronic device 100 and that have long side lengths. This can reduce or avoid warping or falling off of the first antenna branch 210 and the antenna structure 200, and helps improve reliability and stability of disposing a first antenna structure 200 and a second antenna structure 200 in the electronic device 100.

[0089] Alternatively, in some examples, the antenna structure 200 may be located at a corner of the electronic device 100. For example, the first antenna branch 210 or the second antenna branch 220 may be of a curved structure, to be attached to the corner of the electronic device 100. Specifically, shapes of the first antenna branch 210 and the second antenna branch 220 may be selected and set based on a structure design of the electronic device 100 and a specific application scenario.

[0090] Still with reference to FIG. 5, the antenna structure 200 may further include a second matching network 270. One end of the second matching network 270 may be electrically connected to the second end 212 of the first antenna branch 210, and the other end of the second matching network 270 may be grounded. The second matching network 270 can adjust impedance of the first antenna branch 210, so that the impedance of the first antenna branch 210 can meet a requirement of radiating a signal on the first feed point 230.

[0091] For example, when space that is used to dispose the first antenna branch 210 and that is in the electronic device 100 is small, a size of the first antenna branch 210 becomes small. However, when the size of the first antenna branch 210 becomes smaller, the radiation requirement of the signal usually cannot be met. In view of this, the second matching network 270 is disposed. The second matching network can improve overall impedance of the first antenna branch 210, so that the first antenna branch 210 can still radiate the low-frequency signal when the size of the first antenna branch 210 is reduced. Therefore, disposing the second matching network can achieve a requirement of radiating the low-frequency signal when the size of the first antenna branch 210 is reduced, which reduces space occupied by the first antenna branch 210. In addition, disposing the second matching network 270 can improve overall impedance of the first antenna branch 210, to meet radiation for the low-frequency signal.

[0092] Still with reference to FIG. 5, the antenna structure 200 may further include a third matching network 280. One end of the third matching network 280 may be electrically connected to the third end 221 of the second antenna branch 220, and the other end of the third matching network 280 may be grounded. The third matching network 280 can adjust impedance of the second antenna branch 220, so that the impedance of the second antenna branch 220 can meet a requirement of radiating a signal on the second feed point 240.

[0093] For example, when space that is used to dispose the second antenna branch 220 and that is in the electronic device 100 is also small, a size of the second antenna branch 220 is also small. Therefore, it is difficult for the second antenna branch 220 to meet the requirement of radiating the signal. In this case, the third matching network 280 is disposed at the third end 221 of the second antenna branch 220, which can effectively improve the overall impedance of the second antenna branch 220. In this way, the second antenna branch 220 can still radiate the medium-high-frequency signal when the size of the second antenna branch 220 is reduced. Therefore, disposing the third matching network can achieve a requirement of radiating the medium-high-frequency signal when the size of the second antenna branch 220 is reduced, which reduces space occupied by the second antenna branch 220. In addition, this can improve the overall impedance of the second antenna branch 220, to meet radiation for the medium-high-frequency signal.

[0094] FIG. 5A is a diagram of a second structure of the antenna structure according to an embodiment of this application.

[0095] With reference to FIG. 5A, in a possible implementation, on a basis of the structure that is of the antenna structure 200 and that is shown in FIG. 5, the antenna structure 200 may further include a third antenna branch 224. One end of the third antenna branch 224 may be electrically connected to the fourth end 222 of the second antenna branch 220, and the other end of the third antenna branch 224 may be grounded. For example, the antenna structure 200 may further include a ground point 223. The fourth end 222 of the second antenna branch 220 may be electrically connected to the ground point 223, to implement grounding of the third antenna branch 224. For example, the middle frame 110 of the electronic device 100 may further include a metal middle plate 112 (as shown in FIG. 2). The ground point 223 may be disposed on the metal middle plate 112. In this way, signals on the second antenna branch 220 and the third antenna branch 224 may be further transmitted to the metal middle plate 112 through the ground point 223, and be radiated to the outside through the metal middle plate 112, which improves signal propagation strength.

[0096] The third antenna branch 224 may extend a length of the second antenna branch 220, so that a medium-high-frequency signal on the second feed point 240 may be radiated to the outside by using the second antenna branch 220 and the third antenna branch 224, which meets a requirement of radiating the medium-high-frequency signal on the second feed point 240, and helps improve radiation intensity for a medium-high-frequency signal in the antenna structure 200.

[0097] FIG. 5B is a diagram of a third structure of the antenna structure according to an embodiment of this application.

[0098] With reference to FIG. 5B, in another possible implementation, on a basis of the structure that is of the antenna structure 200 and that is shown in FIG. 5, the antenna structure 200 may further include a fourth matching network 290. One end of the fourth matching network 290 may be electrically connected to the fourth end 222 of the second antenna branch 220, and the other end of the fourth matching network 290 may be grounded. For example, the other end of the fourth matching network 290 may be electrically connected to the ground point 223. After the second feed point 240 feeds a medium-high-frequency signal into the second antenna branch 220, the signal may be transmitted to the fourth matching network 290, and be transmitted to the ground point 223 through the fourth matching network 290. The fourth matching network 290 can adjust impedance of the second antenna branch 220, so that the impedance of the second antenna branch 220 can meet a requirement of radiating a signal on the second feed point 240. For example, when a size of a metal side frame that can be used to form the second antenna branch 220 and that is on the electronic device 100 is small, the second antenna branch 220 cannot well meet the requirement of radiating a signal on the second feed point 240. In this case, the fourth matching network 290 is disposed at the fourth end 222 of the second antenna branch 220, which can effectively improve the overall impedance of the second antenna branch 220. In this way, the second antenna branch 220 can meet the requirement of radiating the signal on the second feed point 240, and effectively improves radiation intensity for the signal on the second feed point 240.

[0099] Still with reference to FIG. 5B, the antenna structure 200 may further include a fifth matching network 241. One end of the fifth matching network 241 may be electrically connected to the second antenna branch 220, the other end of the fifth matching network 241 may be electrically connected to the second feed point 240, and the second feed point 240 may be electrically connected to the second antenna branch 220 through the fifth matching network 241. The fifth matching network 241 may block a low-frequency signal on the first feed point 230, to reduce or prevent the signal on the first feed point 230 from flowing into the second feed point 240 after flowing into the second antenna branch 220, so that the low-frequency signal on the first feed point 230 may be transmitted based on a preset route, and be radiated to the outside. This can reduce a loss for the signal on the first feed point 230, and helps improve radiation efficiency for a low-frequency signal in the antenna structure 200.

[0100] In the related technical solution shown in FIG. 4, the distance between the first feed branch 22 and the second feed branch 23 is short, and the first band-stop structure 24 and the second band-stop structure 25 that are disposed on the first feed branch 22 and the second feed branch 23 usually include a plurality of inductors and capacitors, to implement band-stop effect. Insertion losses of the inductors and the capacitors are great. Therefore, in a working process of the antenna structure 2, the first band-stop structure 24 on the first feed branch 22 causes a great loss for the low-frequency signal on the first feed branch 22. Correspondingly, the second band-stop structure 25 on the second feed branch 23 causes a great loss for the high-frequency signal on the second feed branch 23, which greatly reduces signal radiation efficiency.

[0101] However, in this embodiment of this application, a distance between the first feed point 230 and the second feed point 240 is long, and the fifth matching network 241 may be only a capacitor to block the signal on the first feed point 230. This helps reduce an insertion loss for the fifth matching network 241 and reduce a loss for the signal on the second feed point 240.

[0102] Alternatively, in some examples, the antenna structure 200 may further include a sixth matching network (not shown in the figure). One end of the sixth matching network may be electrically connected to the first antenna branch 210, and the other end of the sixth matching network may be electrically connected to the first feed point 230. The sixth matching network reduces or prevents the signal on the second feed point 240 from flowing into the first feed point 230, to reduce the loss for the signal on the second feed point 240, thereby improving radiation efficiency of a low-frequency signal in the antenna structure 200. For example, the sixth matching network may also be only a capacitor. Compared with the solution that is in the related technology and that is shown in FIG. 4, this solution can effectively reduce an insertion loss for the sixth matching network.

[0103] FIG. 6 is a diagram of a fourth structure of the antenna structure according to an embodiment of this application.

[0104] With reference to FIG. 6, in this embodiment of this application, on a basis of the structure that is of the antenna structure 200 and that is shown in FIG. 5A, the antenna structure 200 may further include a fourth antenna branch 213. One end of the fourth antenna branch 213 may be connected to the first end 211 of the first antenna branch 210, and the other end of the fourth antenna branch 213 may be grounded. For example, the one end of the fourth antenna branch 213 may be connected to the first end 211 of the first antenna branch 210 in a manner such as welding. The fourth antenna branch 213 can extend a length of the first antenna branch 210, so that the first antenna branch 210 can better radiate the low-frequency signal. This helps increase a frequency range of a signal that can be radiated by the antenna structure 200, and improve bandwidth of the antenna structure 200.

[0105] Alternatively, in some examples, the fourth antenna branch 213 may be disposed in the antenna structure 200 on a basis of the structure shown in FIG. 5 or FIG. 5B, to extend a length of the first antenna branch 210 in the corresponding antenna structure 200. The fourth antenna branch 213 may be flexibly combined with any one of the antenna structures 200 in FIG. 5, FIG. 5A, and FIG. 5B, to form antenna structures 200 in different forms. Specifically, a disposition form of the fourth antenna branch 213 may be selected and set based on a frame size of the electronic device 100 and a specific application scenario.

[0106] FIG. 7 is a diagram of a first structure of the first matching network according to an embodiment of this application. FIG. 8 is a diagram of a second structure of the first matching network according to an embodiment of this application. FIG. 9 is a diagram of a third structure of the first matching network according to an embodiment of this application. FIG. 10 is a diagram of a fourth structure of the first matching network according to an embodiment of this application.

[0107] As shown in FIG. 7, the first matching network 260 may include a first circuit 261. The first circuit 261 may include at least one of a first inductor 2611 and a first capacitor 2612. For example, as shown in FIG. 7, the first circuit 261 may be the first inductor 2611. Alternatively, as shown in FIG. 8, the first circuit 261 may be the first capacitor 2612. Alternatively, as shown in FIG. 9, the first circuit 261 may include the first inductor 2611 and the first capacitor 2612. In addition, when the first circuit 261 includes the first inductor 2611 and the first capacitor 2612, the first inductor 2611 and the first capacitor 2612 may be connected in series to each other, as shown in FIG. 9, or the first inductor 2611 and the first capacitor 2612 may be connected in parallel to each other, as shown in FIG. 10. Based on an actual tuning requirement of the antenna structure 200, different structures may be implemented for the first matching network 260, so that the first matching network 260 may implement different reactance values.

[0108] The first circuit 261 is of the foregoing several structure forms. Due to this, the first circuit 261 can adjust a total reactance value of the first matching network 260, so that the first matching network 260 can implement a plurality of types of capacitance values and inductance values. In this way, the first matching network 260 can implement tuning of a signal in a wider frequency range, and the antenna structure 200 can radiate a signal in a wider frequency band range, which effectively improves radiation performance of the antenna structure 200.

[0109] FIG. 11 is a diagram of a fifth structure of the first matching network according to an embodiment of this application. FIG. 12 is a diagram of a sixth structure of the first matching network according to an embodiment of this application. FIG. 13 is a diagram of a seventh structure of the first matching network according to an embodiment of this application. FIG. 14 is a diagram of an eighth structure of the first matching network according to an embodiment of this application.

[0110] With reference to FIG. 11, the first matching network 260 may further include a second circuit 262. The second circuit 262 may be connected in series to the first circuit 261 shown in FIG. 11 and FIG. 12. Alternatively, with reference to FIG. 13 and FIG. 14, the second circuit 262 may be connected in parallel to the first circuit 261, to form the first matching network 260. The second circuit 262 can adjust a total reactance value of the first matching network 260 on a basis of the first circuit 261, so that the first matching network 260 can implement a wider range of capacitance values and inductance values. In this way, the first matching network 260 can implement tuning of a signal in a wider frequency range, and the antenna structure 200 can radiate a signal in a wider frequency band range, which effectively improves radiation performance of the antenna structure 200.

[0111] The second circuit 262 may include at least one of a second inductor (not shown in the figure) and a second capacitor (not shown in the figure). For example, the second circuit 262 may be, like the structure of the first circuit 261 shown in FIG. 7, the second inductor. Alternatively, in some examples, the second circuit 262 may be, like the structure of the first circuit 261 shown in FIG. 8, the second capacitor. Alternatively, in some examples, the second circuit 262 may include the second inductor and the second capacitor, and the second inductor and the second capacitor may be connected in series to each other in a combination manner shown in FIG. 9. Alternatively, in some other examples, the second inductor and the second capacitor may be, like the structure shown in FIG. 10, connected in parallel to each other. Details are not described herein again.

[0112] By using the second circuit 262 in the foregoing several disposition manners, a value in a wider range can be achieved for reactance of the second circuit 262, and effect of adjusting the first matching network 260 by the second circuit 262 can be effectively improved. This can implement more disposing forms for the first matching network 260, which effectively increases a value range of a total reactance value of the first matching network 260. In this way, the first matching network 260 can implement tuning of a signal in a wider range, and the antenna structure 200 can radiate a signal in a wider frequency band range, which effectively improves radiation performance of the antenna structure 200.

[0113] In a possible implementation, the first matching network 260 may have a low-pass high-stop mode. When the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may allow a low-frequency signal to pass through but block a medium-high-frequency signal. In this case, the low-frequency signal on the first feed point 230 may be transmitted to the second antenna branch 220 through the first matching network 260, to radiate the low-frequency signal to the outside by using both the first antenna branch 210 and the second antenna branch 220, which improves radiation efficiency of the antenna structure 200 for the low-frequency signal. However, the medium-high-frequency signal on the second antenna branch 220 cannot pass through the first matching network 260, and the medium-high-frequency signal is radiated only on the second antenna branch 220.

[0114] For example, when the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may be the first inductor 2611, as shown in FIG. 7. The first inductor 2611 may allow the low-frequency signal to pass through but block the medium-high-frequency signal, so that the low-frequency signal on the first feed point 230 can pass through the first matching network 260 and is radiated to the outside by using the second antenna branch 220.

[0115] Alternatively, in some examples, when the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may include the first inductor 2611 and the first capacitor 2612, as shown in FIG. 9. The first inductor 2611 is connected in series to the first capacitor 2612, and a capacitance value of the first capacitor 2612 may be greater than 1 pF. In this case, the first matching network 260 is inductive as a whole, and the inductive first matching network 260 has blocking effect on the medium-high-frequency signal but allows the low-frequency signal to pass through. In this way, the low-frequency signal on the first feed point 230 may be transmitted to the second antenna branch 220 through the first matching network 260, to radiate the low-frequency signal to the outside by using both the first antenna branch 210 and the second antenna branch 220, which improves radiation efficiency of the antenna structure 200 for the low-frequency signal.

[0116] Alternatively, in some other examples, when the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may include the first inductor 2611 and the first capacitor 2612, as shown in FIG. 10. The first inductor 2611 may be connected in parallel to the first capacitor 2612, and a capacitance value of the first capacitor 2612 may be less than 1 pF. In this case, the first matching network 260 may still be inductive as a whole, to block the medium-high-frequency signal but allow the low-frequency signal to pass through.

[0117] Alternatively, in still some other examples, when the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may be of the structure shown in FIG. 11. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in parallel to the first capacitor 2612, and a capacitance value of the first capacitor 2612 may be less than 1 pF. The second circuit 262 may be connected in series to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is greater than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is less than 10 nH. The foregoing circuit may still enable the first matching network 260 to block the medium-high-frequency signals but allow the low-frequency signal to pass through.

[0118] Alternatively, in still some other examples, when the first matching network is in the low-pass high-stop mode, the first matching network may be of the structure shown in FIG. 14. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in series to the first capacitor 2612, and a capacitance value of the first capacitor 2612 may be greater than 1 pF. The second circuit 262 may be connected in parallel to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is less than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is greater than 10 nH. The foregoing circuit may still enable the first matching network 260 to block the medium-high-frequency signals but allow the low-frequency signal to pass through.

[0119] In another possible implementation, the first matching network 260 may further have a band-pass mode. When the first matching network 260 is in the band-pass mode, the first matching network 260 may allow a low-frequency signal to pass through, and may also allow a medium-high-frequency signal to pass through. In this case, the low-frequency signal on the first feed point 230 may be transmitted to the second antenna branch 220 through the first matching network 260, to radiate the low-frequency signal to the outside by using both the first antenna branch 210 and the second antenna branch 220. The medium-high-frequency signal on the second feed point 240 may also be transmitted to the first antenna branch 210 through the first matching network 260, to radiate the medium-high-frequency signal to the outside by using both the first antenna branch 210 and the second antenna branch 220.

[0120] For example, when lengths of both the first antenna branch 210 and the second antenna branch 220 are short, and it is difficult to meet requirements of radiating respective signals, in this case, the first matching network 260 is enabled to be in the band-pass mode. In this way, the low-frequency signal and the medium-high-frequency signal can be radiated to the outside by using each other's antenna branches, which improves radiation efficiency of the antenna structure for the low-frequency signal and the medium-high-frequency signal.

[0121] For example, when the first matching network 260 is in the band-pass mode, the first inductor 2611 and the first capacitor 2612 in the first matching network 260 satisfy the following formula: f = 1 / 2 π LC

[0122] f represents a frequency of a signal passing through the first matching network 260, L represents an inductance value of the first inductor 2611 in the first matching network 260, and C represents a capacitance value of the first capacitor 2612 in the first matching network.

[0123] After the frequency of the signal that needs to pass through in the band-pass mode is known, the inductance value of the first inductor 2611 and the capacitance value of the first capacitor 2612 in the first matching network 260 may be calculated by using the foregoing formula. Then, a circuit that matches the first matching network 260 may be designed based on the inductance value of the first inductor 2611 and the capacitance value of the first capacitor 2612.

[0124] For example, when the first matching network 260 is in the band-pass mode, a first matching circuit may be the circuit, as shown in FIG. 9, that includes the first inductor 2611 and the first capacitor 2612. The first inductor 2611 may be connected in series to the first capacitor 2612, and the inductance value and the capacitance value that are of the first inductor 2611 and the first capacitor 2612 that are connected in series satisfy the foregoing formula.

[0125] Alternatively, in some other examples, when the first matching network 260 is in the band-pass mode, the first matching network may be of the structure shown in FIG. 11. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in parallel to the first capacitor 2612. The second circuit 262 may be connected in series to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is greater than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is less than 10 nH.

[0126] Alternatively, in some other examples, when the first matching network 260 is in the band-pass mode, the first matching network 260 may be of the structure shown in FIG. 14. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in series to the first capacitor 2612. The second circuit 262 may be connected in parallel to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is less than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is greater than 10 nH.

[0127] In still another possible implementation, the first matching network may have a high-pass low-stop mode. When the first matching network 260 is in the high-pass low-stop mode, the first matching network 260 may allow a medium-high-frequency signal to pass through but block a low-frequency signal. In this case, the medium-high-frequency signal on the second feed point 240 may be transmitted to the first antenna branch 210 through the first matching network 260, to radiate the medium-high-frequency signal to the outside by using both the first antenna branch 210 and the second antenna branch 220. However, the low-frequency signal on the first antenna branch 210 cannot pass through the first matching network 260, and the low-frequency signal is radiated only on the second antenna branch 220.

[0128] For example, when the first antenna branch 210 meets a requirement of radiating the low-frequency signal, but the second antenna branch 220 cannot meet a requirement of radiating the medium-high-frequency signal, the medium-high-frequency signal on the second feed point 240 may be radiated, through the first matching network 260, to the outside by using the first antenna branch 210.

[0129] For example, when the first matching network 260 is in the high-pass low-stop mode, the first matching network 260 may be the first capacitor 2612, as shown in FIG. 8. The first capacitor 2612 may allow the medium-high-frequency signal to pass through but block the low-frequency signal, so that the medium-high-frequency signal on the second feed point 240 can pass through the first matching network 260 and is radiated to the outside by using the first antenna branch 210.

[0130] Alternatively, in some examples, when the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may include the first inductor 2611 and the first capacitor 2612, as shown in FIG. 9. The first inductor 2611 may be connected in series to the first capacitor 2612, and an inductance value of the first inductor 2611 may be less than 10 nH. In this case, the first matching network 260 is capacitive as a whole, and the capacitive first matching network 260 has blocking effect on the low-frequency signal but allow the medium-high-frequency signal to pass through. In this way, the medium-high-frequency signal on the second feed point 240 may be transmitted to the first antenna branch 210 through the first matching network 260, to radiate the medium-high-frequency signal to the outside by using both the first antenna branch 210 and the second antenna branch 220.

[0131] Alternatively, in some other examples, when the first matching network 260 is in the high-pass low-stop mode, the first matching network 260 may include the first inductor 2611 and the first capacitor 2612, as shown in FIG. 10. The first inductor 2611 may be connected in parallel to the first capacitor 2612, and an inductance value of the first inductor 2611 may be greater than 10 nH. In this case, the first matching network 260 may still be capacitive as a whole, to block the low-frequency signal but allow the medium-high-frequency signal to pass through.

[0132] Alternatively, in still some other examples, when the first matching network 260 is in the low-pass high-stop mode, the first matching network 260 may be of the structure shown in FIG. 11. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in parallel to the first capacitor 2612, and an inductance value of the first inductor 2611 may be greater than 10 nH. The second circuit 262 may be connected in series to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is greater than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is less than 10 nH. The foregoing circuit is still capacitive as a whole, so that the first matching network 260 can block the low-frequency signal but allow the medium-high-frequency signal to pass through.

[0133] Alternatively, in still some other examples, when the first matching network 260 is in the high-pass low-stop mode, the first matching network 260 may be of the structure shown in FIG. 14. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in series to the first capacitor 2612, and an inductance value of the first inductor 2611 may be less than 10 nH. The second circuit 262 may be connected in parallel to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is less than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is greater than 10 nH. The foregoing circuit is still capacitive as a whole, so that the first matching network 260 can block the low-frequency signal but allow the medium-high-frequency signal to pass through.

[0134] In still another possible implementation, the first matching network may further have a band-stop mode. When the first matching network 260 is in the band-stop mode, the first matching network 260 may block a low-frequency signal, and may also block a medium-high-frequency signal. In this case, the low-frequency signal on the first feed point 230 is radiated to the outside only by using the first antenna branch 210, and the medium-high-frequency signal on the second feed point 240 is radiated to the outside only by using the second antenna branch 220.

[0135] For example, when lengths of the first antenna branch 210 and the second antenna branch 220 both meet requirements of radiating respective signals, in this case, the first matching network 260 is enabled to be in the band-stop mode. This prevents signals on the respective branches from being transmitted to each other's antenna branches, thereby avoiding signal interference.

[0136] For example, when the first matching network 260 is in the band-stop mode, the first inductor 2611 and the first capacitor 2612 in the first matching network 260 may satisfy the following formula: f = 1 / 2 π LC

[0137] f represents a frequency of a signal that needs to be blocked by the first matching network 260, L represents an inductance value of the first inductor 2611 in the first matching network 260, and C represents a capacitance value of the first capacitor 2612 in the first matching network.

[0138] After the frequency of the signal that needs to be blocked in the band-stop mode is known, the inductance value of the first inductor 2611 and the capacitance value of the first capacitor 2612 in the first matching network 260 may be calculated by using the foregoing formula. Then, a circuit that matches the first matching network 260 may be designed based on the inductance value of the first inductor 2611 and the capacitance value of the first capacitor 2612.

[0139] For example, when the first matching network 260 is in the band-stop mode, a first matching circuit may be the circuit, as shown in FIG. 10, that includes the first inductor 2611 and the first capacitor 2612. The first inductor 2611 may be connected in parallel to the first capacitor 2612, and the inductance value and the capacitance value that are of the first inductor 2611 and the first capacitor 2612 that are connected in parallel satisfy the foregoing formula.

[0140] Alternatively, in some other examples, when the first matching network 260 is in the band-stop mode, the first matching network may be of the structure shown in FIG. 11. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in parallel to the first capacitor 2612. The second circuit 262 may be connected in series to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is greater than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is less than 10 nH.

[0141] Alternatively, in some other examples, when the first matching network 260 is in the band-stop mode, the first matching network 260 may be of the structure shown in FIG. 14. The first circuit 261 in the first matching network 260 may include the first inductor 2611 and the first capacitor 2612. The first inductor 2611 is connected in series to the first capacitor 2612. The second circuit 262 may be connected in parallel to the first circuit 261, and when the second circuit 262 is a capacitor, a capacitance value of the second circuit 262 is less than 1 pF, and when the second circuit 262 is an inductor, an inductance value of the second circuit 262 is greater than 10 nH.

[0142] FIG. 14A is a diagram of a ninth structure of the first matching network according to an embodiment of this application.

[0143] In another possible implementation, the first matching circuit may alternatively be a variable capacitor or a switch component, so that the variable capacitor or the switch component can also implement tuning of signal transmission on the first antenna branch 210 and the second antenna branch 220.

[0144] For example, with reference to FIG. 14A, the switch component may include at least a first path and a second path that are connected in parallel. In addition, when the first matching network 260 is in a low-pass high-stop mode, the first path of the switch component may be connected, while the second path may be disconnected. For example, when the first path is connected, the first matching network 260 may be in the low-pass high-stop mode, to block a medium-high-frequency signal but allow a low-frequency signal to pass through.

[0145] When the first matching network 260 is in a band-pass mode, the second path of the switch component may be connected, while the first path may be disconnected. For example, when the second path is connected, the first matching network 260 may be in the band-pass mode, so that both a medium-high-frequency signal and a low-frequency signal can pass through.

[0146] Different working modes can be implemented for the first matching network 260 by switching the switch component to different path states, so that the antenna structure 200 can meet a plurality of different signal radiation requirements.

[0147] Alternatively, in some examples, the switch component may further include a third path and a fourth path that are connected in parallel to both the first path and the second path. When the first matching network 260 is in a high-pass low-stop mode, the third path of the switch component may be connected, while the first path, the second path, and the fourth path may all in a disconnected state. However, when the first matching network 260 is in a band-stop mode, the fourth path of the switch component may be connected, while the first path, the second path, and the third path may all be in the disconnected state. In this way, more types of working modes can be implemented for the first matching network 260, so that the antenna structure 200 can meet more signal radiation requirements.

[0148] FIG. 14B is a diagram of control logic according to an embodiment of this application.

[0149] With reference to FIG. 14B, in this embodiment of this application, when the first matching network 260 is a variable capacitor, the electronic device 100 may further include a processor 140 and a controller 150. The processor 140 may be electrically connected to the controller 150, and the controller 150 may be electrically connected to the variable capacitor. The processor 140 may be configured to send a control signal to the controller 150 according to a received switching instruction, and the controller 150 may be configured to switch a capacitance value of the variable capacitor based on the received control signal.

[0150] For example, the switching instruction may include frequency band switching, impedance switching, and mode switching. After receiving the switching instruction, the processor 140 may send a corresponding control signal to the controller 150 according to the switching instruction. After receiving the control signal, the controller may change a corresponding voltage based on an internally stored voltage and capacitance value correspondence table. In this way, a corresponding capacitance value can be switched for the variable capacitor, and different working modes can be implemented for the first matching network 260.

[0151] FIG. 14C is a diagram of other control logic according to an embodiment of this application.

[0152] With reference to FIG. 14C, in this embodiment of this application, when the first matching network 260 is a switch component, the electronic device 100 may further include a processor 140. The processor 140 may be electrically connected to the switch component. The processor 140 may be configured to send a control signal to the switch component according to a received switching instruction. The switch component may be configured to switch a path of the switch component based on the received control signal.

[0153] For example, after receiving the switching instruction, the processor 140 may form a control signal for the switch component based on an internally stored logic table. After receiving the control signal, the switch component may connect or disconnect a corresponding path based on the internally stored logic table. For example, when the switch component receives a first control signal, the first path may be connected, while the second path, the third path, and the fourth path are disconnected, so that the switch component implements the low-pass high-stop mode. However, when the switch component receives a second control signal, the second path may be connected, while the first path, the third path, and the fourth path are disconnected, so that the switch component implements the band-pass mode. For example, when the switch component receives a third control signal, the third path may be connected, while the first path, the second path, and the fourth path are disconnected, so that the switch component implements the high-pass low-stop mode. However, when the switch component receives a fourth control signal, the fourth path may be connected, while the first path, the second path, and the third path are disconnected, so that the switch component implements the band-stop mode.

[0154] In this embodiment of this application, a structure form of the second matching network 270 may be designed with reference to a structure form (for example, the structure form shown in FIG. 7, FIG. 8, FIG. 9, or FIG. 10) of the first matching network 260. For example, the second matching network 270 may include at least one of a third inductor (not shown in the figure) and a third capacitor (not shown in the figure). For example, the second matching network 270 may be the third inductor (referring to the structure that is of the first matching network 260 and that is shown in FIG. 7). Alternatively, the second matching network 270 may be the third capacitor (referring to the structure that is of the first matching network 260 and that is shown in FIG. 8). Alternatively, in some examples, the second matching network 270 may include a third inductor and a third capacitor. The third inductor and the third capacitor may be connected in series to each other (referring to the structure that is of the first matching network 260 and that is shown in FIG. 9). Alternatively, the third inductor and the third capacitor may be connected in parallel to each other (referring to the structure that is of the first matching network 260 and that is shown in FIG. 10). This can increase a reactance value range of the second matching network 270, which helps improve impedance adjustment effect of the second matching network 270 on the first antenna branch 210.

[0155] Alternatively, in some examples, like the structure that is of the first matching network 260 and that is shown in FIG. 11, FIG. 12, FIG. 13, or FIG. 14, the second matching network 270 may include a third circuit (not shown in the figure). The third circuit may be connected in series or in parallel to a circuit formed between the third inductor and the third capacitor in the second matching network 270. The third circuit may also include at least one of an inductor and a capacitor. The capacitor and the inductor may be connected in series to each other, or the inductor and the capacitor may be connected in parallel to each other. This can effective increase a reactance value range of the second matching network 270, so that the second matching network 270 can implement impedance adjustment in a wider range for the first antenna branch 210.

[0156] In this embodiment of this application, a structure form of the third matching network 280 may also be designed with reference to a structure form (for example, the structure form shown in FIG. 7, FIG. 8, FIG. 9, or FIG. 10) of the first matching network 260. For example, the third matching network 280 may include at least one of a fourth inductor (not shown in the figure) and a fourth capacitor (not shown in the figure). For example, the third matching network 280 may be the fourth inductor (referring to the structure that is of the first matching network 260 and that is shown in FIG. 7). Alternatively, the third matching network 280 may be the fourth capacitor (referring to the structure that is of the first matching network 260 and that is shown in FIG. 8). Alternatively, in some examples, the third matching network 280 may include a fourth inductor and a fourth capacitor. The fourth inductor and the fourth capacitor may be connected in series to each other (referring to the structure that is of the first matching network 260 and that is shown in FIG. 9). Alternatively, the fourth inductor and the fourth capacitor may be connected in parallel to each other (referring to the structure that is of the first matching network 260 and that is shown in FIG. 10). This can increase an impedance value range of the third matching network 280, which helps improve impedance adjustment effect of the third matching network 280 on the second antenna branch 220.

[0157] Alternatively, in some examples, like the structure that is of the first matching network 260 and that is shown in FIG. 11, FIG. 12, FIG. 13, or FIG. 14, the third matching network 280 may include a fourth circuit (not shown in the figure). The fourth circuit may be connected in series or in parallel to a circuit formed between the fourth inductor and the fourth capacitor in the third matching network 280. The fourth circuit may also include at least one of an inductor and a capacitor. The capacitor and the inductor may be connected in series to each other, or the inductor and the capacitor may be connected in parallel to each other.

[0158] With reference to the accompanying drawings, a simulation test is performed, in the following, on performance of the antenna structure 200 provided in this embodiment of this application. For example, a test result of the antenna structure 200 may be obtained by inputting a structure parameter of the antenna structure 200 into a test system. For example, a setting parameter of the first antenna branch 210, a setting parameter of the second antenna branch 220, a location parameter of the ground point 223, and setting parameters of the first feed point 230 and the second feed point 240 may be input into the test system, to test a performance parameter of the antenna. In addition, a performance change of the antenna structure 200 when the first matching network 260 is not disposed is compared with a performance change of the antenna structure 200 after the first matching network 260 is disposed, to compare impact of the first matching network 260 on the performance of the antenna structure 200.

[0159] FIG. 15 is a diagram of efficiency for a low-frequency signal when the first matching network is not disposed in the antenna structure according to an embodiment of this application. FIG. 16 is a diagram of efficiency for the low-frequency signal after the first matching network is disposed in the antenna structure according to an embodiment of this application.

[0160] With reference to FIG. 15, it can be learned from coordinate information (1.1727, - 14.269) of a point 1 in FIG. 15 that when the first matching network 260 is not disposed in the antenna structure 200, radiation efficiency of the low-frequency signal on the first antenna branch 210 in the antenna structure 200 is -14.2 dB when a frequency is 1.1727 GHz. With reference to FIG. 16, it can be learned from coordinate information (1.16, -10.399) of a point 1 in FIG. 16 that after the first matching network 260 is disposed in the antenna structure 200, the radiation efficiency of the low-frequency signal on the first antenna branch 210 is -10.399 dB, about -10.4 dB, when the frequency is 1.16 GHz. It can be learned that compared with the radiation efficiency of the low-frequency signal on the first antenna branch 210 before the first matching network 260 is disposed, after the first matching network 260 is disposed in the antenna structure 200, the radiation efficiency of the low-frequency signal on the first antenna branch 210 is improved by 3.8 dB.

[0161] FIG. 17 is a diagram of efficiency for a medium-high-frequency signal after the first matching network is disposed in the antenna structure according to an embodiment of this application.

[0162] With reference to FIG. 17, FIG. 17 is a diagram of radiation efficiency for the medium-high-frequency signal on the second antenna branch 220 after the first matching network 260 is disposed in the antenna structure 200. It can be learned from FIG. 17 that after the first matching network 260 is disposed in the antenna structure 200, the second antenna branch 220 can still radiate a signal in a medium-high frequency band such as B1, B3, and B41. Therefore, the first matching network 260 does not have negative impact on radiation of the signal that is in the medium-high frequency band and that is on the second antenna branch 220.

[0163] FIG. 18 is a current distribution diagram when a signal is fed into the first feed point of the antenna structure according to an embodiment of this application. FIG. 19 is a current distribution diagram when a signal is fed into the second feed point of the antenna structure according to an embodiment of this application.

[0164] In the experiment, verification is performed by using an example in which the antenna structure is of the structure shown in FIG. 5A. The first matching network 260 may be set to allow a low-frequency signal on the first antenna branch 210 to pass through, and transmit the low-frequency signal to the second antenna branch 220 through the first matching network 260 for radiation, but not allow a medium-high-frequency signal on the second antenna branch 220 to pass through. In other words, in this mode, the first matching network 260 may allow the low-frequency signal on the first feed point 230 to pass through, and has interception and blocking effect on the medium-high-frequency signal on the second feed point 240. For example, in this mode, the first matching network 260 may be an inductor element having a large inductive reactance value.

[0165] With reference to FIG. 18, in the foregoing mode, when the first feed point 230 feeds the first antenna branch 210, a current distribution diagram shown in FIG. 18 may be obtained. It can be learned from FIG. 18 that after a current is fed from the first feed point 230 to the first antenna branch 210, the current flows into the second antenna branch 220 from the second end 212 of the first antenna branch 210, and flows into the ground point 223 on the second antenna branch 220, it indicates that the first matching network 260 can allow a signal on the first feed point 230 to pass through. In this way, the low-frequency signal on the first feed point 230 can be radiated to the outside through an antenna formed by the first antenna branch 210 and the second antenna branch 220, and a length of the antenna branch required for radiating the low-frequency signal is extended, so that the antenna structure 200 can implement more efficient radiation of the low-frequency signal.

[0166] When the second feed point 240 feeds the second antenna branch 220, a current distribution diagram shown in FIG. 19 may be obtained. It can be learned from FIG. 19 that after the current is fed from the second feed point 240 to the second antenna branch 220, the current flows in a direction of the fourth end 222 of the second antenna branch 220, and flows into the ground point 223 at the fourth end 222. This indicates that the first matching network 260 has blocking effect on the medium-high-frequency signals on the second feed point 240, so that the medium-high-frequency signals fed into the second feed point 240 can be prevented from flowing into the first antenna branch 210. In this way, the antenna structure 200 implements radiation of the medium-high-frequency signal.

[0167] In descriptions of embodiments of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connection to" and "connection" should be understood in a broad sense. For example, the connection may be a fixed connection, or may be an indirect connection by using an intermediate medium, or may be an internal connection between two elements or an interaction relationship between two elements. For persons of ordinary skill in the art, specific meanings of the foregoing terms in embodiments of this application may be understood based on a specific situation. The terms such as "first", "second", "third", "fourth", and the like (if any) are intended to distinguish between similar objects but do not necessarily indicate a specific order or sequence.

[0168] Finally, it should be noted that the foregoing embodiments are merely used to describe the technical solutions in embodiments of this application, but not to limit the technical solutions. Although embodiments of this application are described in detail with reference to the foregoing embodiments, persons of ordinary skills in the art should understand that the technical solutions recorded in the foregoing embodiments may still be modified, or some or all of technical features thereof may be equivalently replaced. However, these modifications or replacements do not depart from the scope of the technical solutions in embodiments of this application.

Claims

1. An antenna structure, comprising a first antenna branch, a second antenna branch, a first feed point, and a second feed point, wherein the first antenna branch has a first end and a second end that are opposite to each other, and the second antenna branch has a third end and a fourth end that are opposite to each other; the first feed point is electrically connected to the first antenna branch, and the second feed point is electrically connected to the second antenna branch; there is a gap between the second end of the first antenna branch and the third end of the second antenna branch; and the antenna structure further comprises a first matching network, one end of the first matching network is electrically connected to the second end of the first antenna branch, and the other end of the first matching network is electrically connected to the third end of the second antenna branch.

2. The antenna structure according to claim 1, further comprising a second matching network, wherein one end of the second matching network is electrically connected to the second end of the first antenna branch, and the other end of the second matching network is grounded.

3. The antenna structure according to claim 1 or 2, further comprising a third matching network, wherein one end of the third matching network is electrically connected to the third end of the second antenna branch, and the other end of the third matching network is grounded.

4. The antenna structure according to any one of claims 1 to 3, further comprising a third antenna branch, wherein one end of the third antenna branch is electrically connected to the fourth end of the second antenna branch, and the other end of the third antenna branch is grounded.

5. The antenna structure according to any one of claims 1 to 3, further comprising a fourth matching network, wherein one end of the fourth matching network is electrically connected to the fourth end of the second antenna branch, and the other end of the fourth matching network is grounded.

6. The antenna structure according to any one of claims 1 to 5, further comprising a fifth matching network, wherein one end of the fifth matching network is electrically connected to the second antenna branch, the other end of the fifth matching network is electrically connected to the second feed point, and the second feed point is electrically connected to the second antenna branch through the fifth matching network.

7. The antenna structure according to any one of claims 1 to 6, further comprising a fourth antenna branch, wherein one end of the fourth antenna branch is connected to the first end of the first antenna, and the other end of the fourth antenna branch is grounded.

8. The antenna structure according to any one of claims 1 to 7, wherein the first matching network comprises a first circuit, and the first circuit comprises at least one of a first inductor and a first capacitor.

9. The antenna structure according to claim 8, wherein the first matching network further comprises a second circuit, and the second circuit is connected in series to the first circuit; or the second circuit is connected in parallel to the first circuit.

10. The antenna structure according to claim 9, wherein the second circuit comprises at least one of a second inductor and a second capacitor.

11. The antenna structure according to claim 10, wherein the first matching network has a low-pass high-stop mode.

12. The antenna structure according to claim 11, wherein the first matching network is the first inductor; or the first matching network comprises the first inductor and the first capacitor, the first inductor is connected in series to the first capacitor, and a capacitance value of the first capacitor is greater than 1 pF; or the first matching network comprises the first inductor and the first capacitor, the first inductor is connected in parallel to the first capacitor, and a capacitance value of the first capacitor is less than 1 pF.

13. The antenna structure according to claim 11, wherein the first circuit comprises the first inductor and the first capacitor, the first inductor is connected in parallel to the first capacitor, and a capacitance value of the first capacitor is less than 1 pF; and the second circuit is connected in series to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is greater than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is less than 10 nH.

14. The antenna structure according to claim 11, wherein the first circuit comprises the first inductor and the first capacitor, the first inductor is connected in series to the first capacitor, and a capacitance value of the first capacitor is greater than 1 pF; and the second circuit is connected in parallel to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is less than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is greater than 10 nH.

15. The antenna structure according to claim 10, wherein the first matching network has a band-pass mode, and the first inductor and the first capacitor in the first matching network satisfy the following formula: f = 1 / 2 π LC , wherein f represents a frequency of a signal, L represents an inductance value of the first inductor in the first matching network, and C represents a capacitance value of the first capacitor in the first matching network.

16. The antenna structure according to claim 15, wherein the first matching network comprises the first inductor and the first capacitor, and the first inductor is connected in series to the first capacitor.

17. The antenna structure according to claim 15, wherein the first circuit comprises the first inductor and the first capacitor, and the first inductor is connected in parallel to the first capacitor; and the second circuit is connected in series to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is greater than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is less than 10 nH.

18. The antenna structure according to claim 15, wherein the first circuit comprises the first inductor and the first capacitor, and the first inductor is connected in series to the first capacitor; and the second circuit is connected in parallel to the first circuit, and when the second circuit is a capacitor, a capacitance value of the second circuit is less than 1 pF, and when the second circuit is an inductor, an inductance value of the second circuit is greater than 10 nH.

19. The antenna structure according to any one of claims 1 to 7, wherein the first matching network is a variable capacitor or a switch component.

20. The antenna structure according to claim 19, wherein the switch component comprises at least a first path and a second path that are connected in parallel; and when the first matching network is in a low-pass high-stop mode, the first path is connected, and the second path is disconnected; or when the first matching network is in a band-pass mode, the second path is connected, and the first path is disconnected.

21. The antenna structure according to claim 2, wherein the second matching network comprises at least one of a third inductor and a third capacitor.

22. The antenna structure according to claim 3, wherein the third matching network comprises at least one of a fourth inductor and a fourth capacitor.

23. The antenna structure according to any one of claims 1 to 22, wherein the first antenna branch and the second antenna branch are sequentially arranged head to tail in a same direction, the second end of the first antenna branch faces the second antenna branch, and the third end of the second antenna branch faces the first antenna branch.

24. An electronic device, comprising a middle frame and the antenna structure according to any one of claims 1 to 22, wherein the antenna structure is located on the middle frame.

25. The electronic device according to claim 24, wherein the middle frame comprises a first metal side frame and a second metal side frame that are spaced apart from each other; and the first metal side frame forms the first antenna branch of the antenna structure, and the second metal side frame forms the second antenna branch of the antenna structure.

26. The electronic device according to claim 24 or 25, wherein when the first matching network is the variable capacitor, the electronic device comprises a processor and a controller, wherein the processor is electrically connected to the controller, the controller is electrically connected to the variable capacitor, the processor is configured to send a control signal to the controller according to a received switching instruction, and the controller is configured to switch a capacitance value of the variable capacitor based on the received control signal.

27. The electronic device according to claim 24 or 25, wherein when the first matching network is the switch component, the electronic device comprises a processor, wherein the processor is electrically connected to the switch component, the processor is configured to send a control signal to the switch component according to a received switching instruction, and the switch component is configured to switch a path of the switch component based on the received control signal.

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