Antenna structure and intelligent terminal

Abstract

The utility model discloses an antenna structure and an intelligent terminal. The antenna structure comprises a radiation branch and at least two groups of matching circuits, the first end of the radiation branch is suspended, and the second end of the radiation branch is electrically grounded; one end of the matching circuit is used for accessing at least one feeding point, and the other end of the matching circuit is electrically connected with the radiation branch and is sequentially arranged with the grounding point at intervals; wherein the frequencies of the radio frequency signals accessed by the feeding points are different. The utilization rate of the radiation branch of the antenna structure can be improved, and the structural compactness of the intelligent terminal can be improved.

Description

Technical Field

[0001] The present application relates to the field of antenna technology, and in particular to an antenna structure and a smart terminal. Background Art

[0002] With the rapid development of mobile communications, the communication functions of mobile terminals are becoming increasingly rich, and applications such as the Global Positioning System (GPS) and WIFI 2.4GHz / 5G are becoming increasingly popular, requiring more antennas to cover new frequency bands.

[0003] In the process of conceiving and implementing this application, the inventors found that there are at least the following problems: In some schemes, a part of the metal frame of the smart terminal can be used as the radiator of the antenna of the communication frequency band. When the smart terminal has multiple communication frequency bands, the metal frame needs to be divided into multiple sections, and each section of the metal frame is used as the radiator of the antenna of a communication frequency band. One radiator of the existing antenna cannot radiate radio frequency signals of multiple frequency bands, and multiple radiators need to be set up, resulting in more metal frames of the smart terminal being occupied, reducing the structural compactness of the smart terminal.

[0004] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0005] The main purpose of this application is to propose an antenna structure and an intelligent terminal, aiming to improve the utilization rate of the radiation branch of the antenna structure and improve the structural compactness of the intelligent terminal.

[0006] To achieve the above objectives, the present application proposes an antenna structure, comprising:

[0007] A radiation branch, wherein a first end of the radiation branch is suspended in the air and a second end of the radiation branch is grounded;

[0008] At least two groups of matching circuits, one end of each matching circuit is used to access at least one feeding point, and the other end of each matching circuit is electrically connected to each radiation branch and is sequentially spaced from each ground point;

[0009] The frequencies of the radio frequency signals connected to at least two of the feeding points are different.

[0010] In an optional embodiment, at least two of the matching circuits include a first matching circuit and a second matching circuit, the first matching circuit is connected to the first feeding point, and the second matching circuit is connected to the second feeding point and the third feeding point; including at least one of the following:

[0011] The electrical length formed by the radiation signal connected to the first feeding point on the radiation branch is greater than a quarter wavelength and less than a half wavelength;

[0012] The electrical length formed on the radiation branch by the radiation signal connected to the second feeding point is greater than one eighth of the wavelength and less than one quarter of the wavelength;

[0013] The electrical length formed on the radiation branch by the radiation signal connected to the third feeding point is greater than one eighth of the wavelength and less than one half of the wavelength.

[0014] In an optional embodiment, the matching circuit includes a tuning circuit, one end of which is connected to the feeding point, and the tuning circuit is configured to tune the connected radio frequency signal so that the radio frequency signal is within a predetermined working frequency band.

[0015] In an optional embodiment, the matching circuit includes a filter circuit, one end of the filter circuit is connected to the other end of the tuning circuit, the other end of the filter circuit is electrically connected to the radiation branch, and the filter circuit is configured to filter the connected RF signal and then output it.

[0016] In an optional embodiment, at least one of the at least two matching circuits further includes a dual-frequency combiner, one end of the dual-frequency combiner is connected to the tuning circuit, and the other end of the dual-frequency combiner is respectively connected to the two feeding points.

[0017] In an optional embodiment, the filtering circuit includes a first capacitor and a first inductor, and the first capacitor and the first inductor are arranged in parallel; one end of the first capacitor and the first inductor is connected to the other end of the tuning circuit, and the other end of the first capacitor and the first inductor is electrically connected to the radiation branch.

[0018] In an optional embodiment, at least two of the matching circuits include a first matching circuit, the tuning circuit of the first matching circuit includes a second inductor and a third inductor, one end of the second inductor is connected to the filter circuit, the other end of the second inductor is respectively interconnected with one end of the third inductor and the feeding point, and the other end of the third inductor is grounded.

[0019] In an optional embodiment, at least two of the matching circuits include a second matching circuit, and the tuning circuit of the second matching circuit includes a fourth inductor, a fifth inductor, a second capacitor and a third capacitor, one end of the fourth inductor is connected to the filter circuit, and the other end of the fourth inductor is respectively interconnected with one end of the fifth inductor and one end of the second capacitor; the other end of the fifth inductor is grounded; the other end of the second capacitor is connected to one end of the third capacitor and the feeding point; and the other end of the third capacitor is grounded.

[0020] In an optional embodiment, a current signal is fed into a feeding point connected to at least one of the two matching circuits, so that the radiation branch excites a first mode to generate a radiation signal in a first frequency band;

[0021] A current signal is fed into a feeding point connected to another one of the at least two matching circuits, so that the radiation branch excites a second mode to generate a radiation signal of a second frequency band;

[0022] Another feeding point connected to another one of the at least two matching circuits feeds a current signal, so that the radiation branch excites a third mode to generate a radiation signal in a third frequency band.

[0023] The present application also proposes a smart terminal, comprising the antenna structure as described above.

[0024] In an optional embodiment, the smart terminal further includes a frame; the radiating branch of the antenna structure is arranged on the frame; or the radiating branch of the antenna structure is integrally arranged with the frame.

[0025] In an optional embodiment, the smart terminal further includes a ground plate, which is electrically connected to the grounding point of the antenna structure; and / or the smart terminal further includes a mainboard, and the matching circuit and feeding point of the antenna structure are arranged on the mainboard.

[0026] The present application also proposes a smart terminal, which includes the antenna structure as described above.

[0027] An embodiment of the present application provides an antenna structure, in which at least two feeding points are electrically connected to the same radiating branch through a matching circuit. The frequencies of the radio frequency signals transmitted by the various feeding points are different. Each feeding point is electrically connected to the radiating branch through a matching circuit, so that the radio frequency signal is within a preset working frequency band. The preset working frequency bands corresponding to at least two feeding points are different, so that the radiation of radio frequency signals of multiple frequency bands can be achieved by using the same radiating branch, thereby improving the utilization rate of the radiating branch, reducing the occupancy rate of the metal frame of the smart terminal, and improving the structural compactness of the smart terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0029] Figure 1 A schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application;

[0030] Figure 2 A communication network system architecture diagram provided for an embodiment of the present application;

[0031] Figure 3 is a structural schematic diagram of a first implementation of an antenna structure provided in an embodiment of the present application;

[0032] Figure 4 is a structural diagram of a second implementation of the antenna structure provided in an embodiment of the present application;

[0033] Figure 5 The antenna structure f provided in the embodiment of the present application 0 Schematic diagram of frequency band equivalent circuit;

[0034] Figure 6 The antenna structure f provided in the embodiment of the present application 0 Schematic diagram of the Smith impedance circle trend in the frequency band;

[0035] Figure 7 The antenna structure f provided in the embodiment of the present application 1 Schematic diagram of frequency band equivalent circuit;

[0036] Figure 8 The antenna structure f provided in the embodiment of the present application 1 Schematic diagram of the Smith impedance circle trend in the frequency band;

[0037] Fig. 9 The antenna structure f provided in the embodiment of the present application 2 Schematic diagram of frequency band equivalent circuit;

[0038] Fig.10 The antenna structure f provided in the embodiment of the present application 2 Schematic diagram of the Smith impedance circle trend in the frequency band;

[0039] Fig.11 It is the S11 waveform diagram of the overall port of the antenna structure provided in the embodiment of the present application;

[0040] Fig.12 is a structural diagram of a third implementation of the antenna structure provided in an embodiment of the present application applied to a smart terminal;

[0041] Fig.13 is an S11 / S21 waveform diagram of the antenna structure provided in an embodiment of the present application;

[0042] Fig.14 It is a diagram of the total antenna efficiency of the antenna structure provided in an embodiment of the present application.

[0043] The realization of the purpose, functional features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. The above-mentioned drawings have shown clear embodiments of this application, which will be described in more detail later. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0045] It should be noted that, in this article, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element. Optionally, components, features, and elements with the same name in different embodiments of the present application may have the same meaning or different meanings, and their specific meanings need to be determined by their explanation in the specific embodiment or further combined with the context in the specific embodiment.

[0046] It should be understood that, although the terms first, second, third, etc. may be used to describe various information in this article, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of this article, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". Furthermore, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or", "and / or", "including at least one of the following" etc. used in this application can be interpreted as inclusive, or mean any one or any combination. For example, “comprising at least one of the following: A, B, C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”, and for another example, “A, B or C” or “A, B and / or C” means “any of the following: A; B; C; A and B; A and C; B and C; A and B and C”. An exception to this definition will only occur when a combination of elements, functions, steps or operations are inherently mutually exclusive in some manner.

[0047] It should be understood that, although the various steps in the flowchart in the embodiment of the present application are displayed in sequence according to the indication of the arrows, these steps are not necessarily performed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and it can be performed in other orders. Moreover, at least a portion of the steps in the figure may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily performed at the same time, but can be performed at different times, and their execution order is not necessarily performed in sequence, but can be performed in turn or alternately with other steps or at least a portion of the sub-steps or stages of other steps.

[0048] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0049] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0050] In the subsequent description, the suffixes such as "module", "component" or "unit" used to represent elements are only used to facilitate the description of the present application, and have no specific meanings. Therefore, "module", "component" or "unit" can be used in a mixed manner.

[0051] The smart terminal may be implemented in various forms. For example, the smart terminal described in this application may include smart terminals such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminals such as digital TVs and desktop computers.

[0052] The following description will be made by taking a mobile terminal as an example, and those skilled in the art will understand that, in addition to components specifically used for mobile purposes, the construction according to the embodiments of the present application can also be applied to fixed-type terminals.

[0053] See also Figure 1 , which is a schematic diagram of the hardware structure of a mobile terminal for implementing various embodiments of the present application, the mobile terminal 100 may include: RF (Radio Frequency, radio frequency) unit 101, WiFi module 102, audio output unit 103, A / V (audio / video) input unit 104, sensor 105, display unit 106, user input unit 107, interface unit 108, memory 109, processor 110, and power supply 111 and other components. Those skilled in the art can understand that Figure 1 The structure of the mobile terminal shown in the figure does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[0054] Combine the following Figure 1 The following is a detailed introduction to the various components of the mobile terminal:

[0055] The radio frequency unit 101 can be used for receiving and sending signals during information transmission or communication. Specifically, after receiving the downlink information of the base station, it is sent to the processor 110 for processing; in addition, the uplink data is sent to the base station. Generally, the radio frequency unit 101 includes but is not limited to an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc. In addition, the radio frequency unit 101 can also communicate with the network and other devices through wireless communication. The above-mentioned wireless communications can use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication), GPRS (General Packet Radio Service), CDMA2000 (Code Division Multiple Access 2000), WCDMA (Wideband Code Division Multiple Access), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution), TDD-LTE (Time Division Duplexing-Long Term Evolution) and 5G, etc.

[0056] WiFi is a short-range wireless transmission technology. Mobile terminals can help users send and receive emails, browse web pages, and access streaming media through WiFi module 102. It provides users with wireless broadband Internet access. Figure 1 The WiFi module 102 is shown, but it is understandable that it is not an essential component of the mobile terminal and can be omitted as required without changing the essence of the invention.

[0057] The audio output unit 103 can convert the audio data received by the RF unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output it as sound when the mobile terminal 100 is in a call signal reception mode, a talk mode, a recording mode, a voice recognition mode, a broadcast reception mode, etc. Moreover, the audio output unit 103 can also provide audio output related to a specific function performed by the mobile terminal 100 (for example, a call signal reception sound, a message reception sound, etc.). The audio output unit 103 may include a speaker, a buzzer, etc.

[0058] The A / V input unit 104 is used to receive audio or video signals. The A / V input unit 104 may include a graphics processor (GPU) 1041 and a microphone 1042, and the graphics processor 1041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The processed image frame can be displayed on the display unit 106. The image frame processed by the graphics processor 1041 can be stored in the memory 109 (or other storage medium) or sent via the radio frequency unit 101 or the WiFi module 102. The microphone 1042 can receive sound (audio data) via the microphone 1042 in a telephone call mode, a recording mode, a voice recognition mode, and other operating modes, and can process such sound into audio data. The processed audio (voice) data can be converted into a format output that can be sent to a mobile communication base station via the radio frequency unit 101 in the case of a telephone call mode. The microphone 1042 can implement various types of noise elimination (or suppression) algorithms to eliminate (or suppress) noise or interference generated in the process of receiving and sending audio signals.

[0059] The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Optionally, the light sensor includes an ambient light sensor and a proximity sensor. Optionally, the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of the ambient light, and the proximity sensor can turn off the display panel 1061 and / or the backlight when the mobile terminal 100 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in all directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that identify the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors that can also be configured on the mobile phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc., they will not be repeated here.

[0060] The display unit 106 is used to display information input by the user or information provided to the user. The display unit 106 may include a display panel 1061, which may be configured in the form of a liquid crystal display (LCD), an organic light-emitting diode (OLED), or the like.

[0061] The user input unit 107 can be used to receive input digital or character information, and to generate key signal input related to the user settings and function control of the mobile terminal. Optionally, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also known as a touch screen, can collect the user's touch operation on or near it (such as the user's operation on the touch panel 1071 or near the touch panel 1071 using any suitable object or accessory such as a finger, stylus, etc.), and drive the corresponding connection device according to a pre-set program. The touch panel 1071 may include two parts: a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into the touch point coordinates, and then sends it to the processor 110, and can receive and execute the command sent by the processor 110. In addition, the touch panel 1071 can be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 107 may further include other input devices 1072. Optionally, the other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, a function key (such as a volume control key, a switch key, etc.), a trackball, a mouse, a joystick, etc., which are not specifically limited here.

[0062] Optionally, the touch panel 1071 may cover the display panel 1061. When the touch panel 1071 detects a touch operation on or near it, it transmits the information to the processor 110 to determine the type of touch event. Then, the processor 110 provides corresponding visual output on the display panel 1061 according to the type of touch event. Figure 1 In the figure, the touch panel 1071 and the display panel 1061 are used as two independent components to implement the input and output functions of the mobile terminal. However, in some embodiments, the touch panel 1071 and the display panel 1061 can be integrated to implement the input and output functions of the mobile terminal, which is not limited here.

[0063] The interface unit 108 serves as an interface through which at least one external device can be connected to the mobile terminal 100. For example, the external device may include a wired or wireless headset port, an external power supply (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device with an identification module, an audio input / output (I / O) port, a video I / O port, a headphone port, etc. The interface unit 108 may be used to receive input (e.g., data information, power, etc.) from an external device and transmit the received input to one or more elements within the mobile terminal 100 or may be used to transmit data between the mobile terminal 100 and an external device.

[0064] The memory 109 can be used to store software programs and various data. The memory 109 can mainly include a program storage area and a data storage area. Optionally, the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data created according to the use of the mobile phone (such as audio data, a phone book, etc.), etc. In addition, the memory 109 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0065] The processor 110 is the control center of the mobile terminal. It uses various interfaces and lines to connect various parts of the entire mobile terminal. It executes various functions of the mobile terminal and processes data by running or executing software programs and / or modules stored in the memory 109, and calling data stored in the memory 109, so as to monitor the mobile terminal as a whole. The processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor and a modem processor. Optionally, the application processor mainly processes the operating system, user interface, and application programs, and the modem processor mainly processes wireless communications. It is understandable that the above-mentioned modem processor may not be integrated into the processor 110.

[0066] The mobile terminal 100 may also include a power supply 111 (such as a battery) for supplying power to various components. Preferably, the power supply 111 may be logically connected to the processor 110 via a power management system, thereby implementing functions such as charging, discharging, and power consumption management through the power management system.

[0067] although Figure 1 Not shown, the mobile terminal 100 may further include a Bluetooth module, etc., which will not be described in detail here.

[0068] In order to facilitate understanding of the embodiments of the present application, the communication network system on which the mobile terminal of the present application is based is described below.

[0069] See also Figure 2 , Figure 2 A communication network system architecture diagram is provided for an embodiment of the present application, wherein the communication network system is an LTE system of universal mobile communication technology, and the LTE system includes a UE (User Equipment) 201, an E-UTRAN (Evolved UMTS Terrestrial Radio Access Network) 202, an EPC (Evolved Packet Core) 203 and an operator's IP service 204, which are connected in sequence for communication.

[0070] Optionally, UE201 may be the above-mentioned terminal 100, which will not be described in detail here.

[0071] E-UTRAN 202 includes eNodeB 2021 and other eNodeBs 2022 , etc. Optionally, eNodeB 2021 may be connected to other eNodeBs 2022 via a backhaul (eg, an X2 interface), and eNodeB 2021 is connected to EPC 203 , and eNodeB 2021 may provide UE 201 with access to EPC 203 .

[0072] EPC203 may include MME (Mobility Management Entity) 2031, HSS (Home Subscriber Server) 2032, other MMEs 2033, SGW (Serving Gate Way) 2034, PGW (PDN Gate Way) 2035 and PCRF (Policy and Charging Rules Function) 2036, etc. Optionally, MME 2031 is a control node that processes signaling between UE 201 and EPC 203, and provides bearer and connection management. HSS 2032 is used to provide some registers to manage functions such as home location register (not shown in the figure), and store some user-specific information such as service features and data rates. All user data can be sent through SGW2034, PGW2035 can provide IP address allocation and other functions for UE 201, PCRF2036 is the policy and charging control policy decision point for service data flow and IP bearer resources, which selects and provides available policy and charging control decisions for the policy and charging execution function unit (not shown in the figure).

[0073] The IP service 204 may include the Internet, an intranet, an IMS (IP Multimedia Subsystem) or other IP services.

[0074] Although the above introduction takes the LTE system as an example, those skilled in the art should know that the present application is not only applicable to the LTE system, but also to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, 5G and future new network systems (such as 6G), etc., without limitation here.

[0075] Based on the above-mentioned mobile terminal hardware structure and communication network system, various embodiments of the present application are proposed.

[0076] First embodiment

[0077] With the continuous improvement of satellite technology and software algorithms, more and more terminal products need to support dual-frequency / triple-frequency GPS satellite search and positioning, and add GPS L2 / L5 auxiliary positioning (1175MHz~1229MHz) on the basis of the conventional GPS L1 frequency band (1575.42MHz) to increase positioning accuracy. GPS L5 has a longer wavelength and less spatial attenuation, which greatly improves positioning accuracy in scenarios that require high-precision positioning, such as driving on viaducts. 5G mobile terminals need to add more sub6G NR antennas to achieve 5G communication, and the antenna space requirements need to be more inclined to NR antennas. Therefore, adding compatible GPSL2 / L5 antennas to 5G terminal products increases the difficulty of antenna design. How to achieve GPS L1+L5 or GPS L1+L2+L5 dual-frequency / triple-frequency high-performance antenna radiation in a smaller space is a problem that needs to be solved at present. At the same time, due to space constraints, GPS antennas often need to be compatible with WIFI2.4G at the same time, which makes the design more difficult.

[0078] Reference Figure 3 , Figure 3 It is a structural schematic diagram of the antenna structure shown according to the first embodiment. The antenna structure of the embodiment of the present application can be applied to a smart terminal (such as a mobile phone). The antenna structure includes a radiating branch 10; the first end of the radiating branch 10 is suspended; the second end of the radiating branch 10 is grounded; at least two matching circuits, one end of the matching circuit is used to access at least one feeding point, and the other end of the matching circuit is electrically connected to the radiating branch 10, and is sequentially spaced from the ground point GND. Optionally, the frequencies of the RF signals connected to at least two of the feeding points are different.

[0079] In this embodiment, the antenna structure can be applied to a smart terminal. Optionally, in this embodiment, the radiating branch 10 can be set on the frame of the smart terminal, or the radiating branch 10 can be set on the shell of the smart terminal, or the radiating branch 10 can be set on a circuit board, or the radiating branch 10 can be set on other carriers, which is not limited here. When the radiating branch 10 is set on the frame of the smart terminal, it can be optionally set on the top of the frame, and the whole can be an L-shaped structural member, and the radiating branch 10 can also be a straight strip structural member as a whole. It can be specifically set according to the position of the radiating branch 10 on the metal frame, which is not limited here. When the GPS antenna (L1 / L2 / L5) is set on the top of the smart terminal, the upper hemisphere accounts for a high proportion (>-3dB) of the directional diagram, and top radiation is used, which is conducive to satellite search.

[0080] Optionally, when the radiation branch 10 can be set in the frame of the smart terminal, the two ends of the radiation branch 10 can be spaced apart from other frames by opening a gap 10a, and the first end of the radiation branch 10 suspended in the air and the second end grounded can both be physically connected to other frames through insulating materials.

[0081] Optionally, the number of feeding points connected to the matching circuit is at least two, which can be two or more than two. The frequencies of at least two connected RF signals are different, and each feeding point can also be used to connect to a radiation signal of a frequency band. The number of feeding points is different according to the application requirements of the functions that the smart terminal needs to implement. The number of feeding points in this embodiment can be selected as two or more, so as to achieve dual-band signal output, three-band signal output or four-band signal output. Optionally, the antenna structure works in different frequency bands, and can simultaneously access RF signals of different frequency bands, or can time-share RF signals of different frequency bands, or select a corresponding one of the RF signals of different frequency bands for access according to the needs of actual applications.

[0082] Optionally, when realizing triple-band signal output, the antenna structure can be GPS L1 antenna, GPS L5 and WIFI2.4G antenna; when realizing quad-band signal output, the antenna structure can be GPS L1 antenna, GPS L2, GPS L5 and WIFI2.4G antenna. The frequency band of GPS L1 antenna is (1559MHz~1620MHz), the frequency band of GPS L2 / L5 is (1175MHz~1229MHz), and the frequency band of WIFI 2.4G is (2400MHz~2500MHz).

[0083] Optionally, the intelligent terminal can be provided with a mainboard and a grounding plate, and the mainboard can be integrated with components such as a control chip, a signal processing chip, a control switch interface, and an indicator light, and a matching circuit can be provided on the mainboard, and the matching circuit and the feeding point are both provided on the mainboard. A feeding terminal and a grounding terminal are provided on the radiating branch 10, and the radiating branch 10 is electrically connected to the matching circuit on the mainboard through the feeding terminal, and the radiating branch 10 is electrically connected to the grounding plate through the grounding terminal. When the feeding point is connected to the feed source, the feeding current flows into the grounding plate through the current path formed by the feeding point, the matching circuit, the feeding terminal of the radiating branch 10, and the grounding terminal of the radiating branch 10, thereby realizing the radiation and reception of the radio frequency signal.

[0084] Optionally, when the radiation branch 10 is arranged on a carrier other than the mainboard, it can be electrically connected to the mainboard through an electrical connector such as a spring arranged on the mainboard. The grounding plate can be arranged between the mainboard and the display screen of the smart terminal. The grounding plate serves as the main ground of the smart terminal. The antenna structure can be directly connected to the grounding plate by using a ground isolation rib, or it can be indirectly connected to the grounding plate by means of a grounding connector, a filter circuit and a system ground of the mainboard.

[0085] In this embodiment, the matching circuit may be an L-type matching circuit, a T-type matching circuit, a π-type matching circuit, or a matching circuit configured by other capacitors, inductors, and combinations of capacitors and inductors. The matching circuit is used to adjust the impedance matching between the radiator and other RF circuits provided on the mainboard, and to filter out clutter signals other than the frequency band of the RF signal. The number of matching circuits may be two or more. This embodiment is described using two as an example. Optionally, one of the two matching circuits is a first matching circuit 20, and the other is a second matching circuit 30. The feeding point to which the first matching circuit 20 is connected is recorded as a first feeding point S0. The first feeding point S0 feeds a current signal so that the radiating branch 10 excites a first mode to generate a radiation signal of a first frequency band. The first mode is the GPS L1 antenna mode, and the first frequency band f 0 It is the frequency band corresponding to the GPS antenna, specifically (1559MHz~1620MHz).

[0086] Optionally, the second matching circuit 30 is connected to two feeding points, which are respectively denoted as the second feeding point S1 and the third feeding point S2. A current signal is fed into one feeding point (the second feeding point S1) connected to the second matching circuit 30, so that the radiation branch 10 excites a second mode to generate a radiation signal of a second frequency band; the second mode is the GPS L2 / L5 antenna mode, and the second frequency band f 1 This is the frequency band corresponding to the GPS L2 / L5 antenna, specifically (1175MHz~1229MHz).

[0087] Optionally, another feeding point (third feeding point S2) connected to the second matching circuit 30 feeds a current signal, so that the radiation branch 10 excites a third mode to generate a radiation signal of a third frequency band; the third mode is a WIFI 2.4G antenna mode, and the third frequency band f 2 The frequency band corresponding to the WIFI 2.4G antenna is (2400MHz~2500MHz).

[0088] The embodiment of the present application provides an antenna structure, which enables at least two feeding points to be electrically connected to the same radiating branch 10 through a matching circuit. The frequencies of the RF signals transmitted by each feeding point are different. Each feeding point is electrically connected to the radiating branch 10 through a matching circuit, so that the RF signal is within a preset working frequency band. The preset working frequency bands corresponding to each feeding point are different, so that the radiation of RF signals of multiple frequency bands can be achieved by using the same radiating branch 10, thereby improving the utilization rate of the radiating branch 10, reducing the occupancy rate of the metal frame of the smart terminal, and improving the structural compactness of the smart terminal. The present application proposes a single radiating branch 10 (single ground single opening slit) in a compact space to achieve multiple frequency bands, which can specifically be an antenna component for high-performance radiation of GPSL1 / L2 / L5 and WIFI2.4G.

[0089] Second embodiment

[0090] Based on any of the schemes in the above embodiments, the matching circuit includes a tuning circuit, one end of which is used to access a feeding point; the tuning circuit is used to tune the connected radio frequency signal so that the radio frequency signal is within a predetermined working frequency band.

[0091] Optionally, a filter circuit, one end of the filter circuit is connected to the other end of the tuning circuit; the other end of the filter circuit is electrically connected to the radiation branch 10, and the filter circuit is used to filter the connected RF signal and then output it.

[0092] In this embodiment, the number of matching circuits can be set to two, respectively denoted as the first matching circuit 20 and the second matching circuit 30, the first matching circuit 20 includes a first filter circuit 21 and a first coordination circuit 22, and the second matching circuit 30 includes a second filter circuit 31 and a second coordination circuit 32. The first filter circuit 21 and the second filter circuit 31 can be band-stop filter circuits, and the band-stop frequency of the filter circuit is the frequency of the RF signal connected to the feeding point. Optionally, the frequencies of the radiation signals connected to the first filter circuit 21 and the second filter circuit 31 are different. The access point of the first filter circuit 21 and the radiation branch 10 is denoted as point A, and the access point of the second filter circuit 31 and the radiation branch 10 is denoted as point B, and point A and point B belong to different positions of the radiation branch 10. Optionally, point A can be set between point B and the grounding point GND.

[0093] In this embodiment, the first coordination circuit 22 and the second coordination circuit 32 are used to implement dual-frequency f 1 Frequency band / f 2 The frequency band waveform is close to 50Ω, which makes the port energy radiate outward more effectively, or realize f 0 The frequency band waveform is close to 50Ω, so that the port energy is radiated outward more effectively. The second filter circuit 31 is used to filter out f 0The first filter circuit 21 is used to filter out the clutter signals outside the frequency band. 1 / f 2 The clutter signal outside the frequency band. Optionally, f 0 The frequency band can be selected to correspond to GPS L 1 Antenna (1559MHz~1620MHz), compared with equivalent wavelength λ 0 ;f 1 Optional for GPS L 2 / L5 antenna (1175MHz~1229MHz), compared with equivalent wavelength λ 1 ;f 2 Optional corresponding WIFI 2.4G antenna (2400MHz~2500MHz), compare the equivalent wavelength λ 2 .

[0094] Optionally, the overall radiation branch is matched with multiple sets of matching and dual-frequency combiner 33 and f 1 / f 2 The feed source is connected, and the overall radiation branches are matched with f 0 The feed source is connected, one side of the overall radiation branch 10 is under the ground and the other side is suspended, f 1 / f 2 The connection point between the feed source and the radiation branch 10 is at f 0 Between the feed source and the ground point GND.

[0095] Optionally, at least one of the at least two matching circuits further includes a dual-frequency combiner 33, one end of the dual-frequency combiner 33 is connected to the tuning circuit, and the other end of the dual-frequency combiner 33 is also used to connect to the two feeding points.

[0096] In this embodiment, the dual-frequency combiner 33 can be specifically arranged in the second matching circuit 30, and the input end of the dual-frequency combiner 33 is connected to two feeding points (the second feeding point S1 and the third feeding point S2), which can be used to access the radio frequency signals of the two frequency bands, which can be specifically taken as f 1 Frequency band (corresponding to GPS L2 / L5 antenna (1175MHz~1229MHz)) and f 2 The two feeding points are connected to the input end of the dual-frequency combiner 33, and the signals are combined into one path as the output end of the antenna, which is connected to the second filter circuit 31. Optionally, the characteristic impedance of the three ports of the dual-frequency combiner 33 is set to 50Ω to meet the impedance matching on each RF link and ensure that the RF signal can be transmitted correctly. Through the dual-frequency combiner 33, f 1 Frequency band and f 2The frequency band can share the filter circuit and the tuning circuit. When working, the radiation branch is matched with the f through multiple sets of matching and the dual-frequency combiner 33. 1 Frequency band / f 2 The frequency band feed is electrically connected.

[0097] Optionally, the first filter circuit 21 and the second filter circuit 31 each include a first capacitor and a first inductor, the first capacitor and the first inductor are arranged in parallel, one end of the first capacitor and the first inductor is connected to the other end of the tuning circuit, and the other end of the first capacitor and the first inductor is electrically connected to the radiation branch. The size of the first capacitor and the first inductor can be set according to the frequency of the RF signal connected to the feeding point, which is not specifically limited in this embodiment. The first capacitor of the first filter circuit 21 is marked as C1, the first capacitor of the second filter circuit 31 is marked as C2, the first inductor of the second filter circuit 31 is marked as L1, and the first inductor of the second filter circuit 31 is marked as L2. In the two filter circuits, the first filter circuit 21 and the second filter circuit 31, when setting the parameters of the first capacitor C1 and the first inductor L1 of the first filter circuit 21, L1*C1 can be set at (5035 / f 0 )2±1.5 (nH / pF / MHz), the filtering f 0 Frequency band effect. Optionally, L1 represents the inductance value of the first inductor L1, and C1 represents the capacitance value of the first capacitor C1. Optionally, the inductance value of the first inductor L1 can be set to 5.1nH for reference, and the capacitance value of the first capacitor C1 can be set to 1.8pF for reference.

[0098] Optionally, when setting the parameters of the first capacitor C2 and the first inductor L2 of the second filter circuit 31, L2*C2 can be set to (5035 / f 1 )2±1.5 (nH / PF / MHz), the filtering f 1 Frequency band effect. Wherein, L2 represents the inductance value of the first inductor L2, C2 represents the capacitance value of the first capacitor C2, and optionally, the inductance value of the first inductor L2 can be set to 3nH for reference, and the capacitance value of the first capacitor C2 can be set to 6.2pF for reference.

[0099] Optionally, the first tuning circuit 22 includes a second inductor L5 and a third inductor L6, one end of the second inductor L5 is connected to the filter circuit, the other end of the second inductor L5 is respectively connected to one end of the third inductor L6 and the feeding point, and the other end of the third inductor L6 is grounded.

[0100] Optionally, the second inductor L5 and the third inductor L6 are marked as L5 and L6, respectively, for realizing f 0The waveform is close to 50Ω, so that the port energy is radiated outward more effectively. Optionally, the inductance value of the second inductor L5 can be set to 8.6nH for reference, and the inductance value of the third capacitor L6 can be set to 8.2nH for reference.

[0101] Optionally, the second tuning circuit 32 includes a fourth inductor L3, a fifth inductor L4, a second capacitor C3 and a third capacitor C4, one end of the fourth inductor L3 is connected to the filter circuit, and the other end of the fourth inductor L3 is interconnected with one end of the fifth inductor L4 and one end of the second capacitor C3 respectively; the other end of the fifth inductor L4 is grounded; the other end of the second capacitor C3 is interconnected with one end of the third capacitor C4 and the feeding point; the other end of the third capacitor C4 is grounded.

[0102] In this embodiment, L3 / L4 / C3 / C4 implements dual-frequency f 1 / f 2 The waveform is close to 50Ω, so that the port energy is radiated outward more effectively. Optionally, the inductance value of the fourth inductor L3 can be set to 5.1nH, the inductance value of the fifth inductor L4 can be set to 33nH, the capacitance value of the second capacitor C3 can be set to 0.75pF, and the capacitance value of the third capacitor C4 can be set to 0.5pF.

[0103] The electrical length formed by the radiation signal connected to the first feeding point S0 on the radiation branch 10 is greater than a quarter wavelength (λ 0 / 4) is less than half the wavelength (λ 0 / 2); the electrical length of the radiation signal connected to the second feeding point S1 on the radiation branch 10 is greater than one eighth of the wave (λ 1 / 8) is less than a quarter wavelength (λ 1 / 4); the electrical length of the radiation signal connected to the third feeding point S2 formed on the radiation branch 10 is greater than one eighth of the wavelength (λ 2 / 8) is less than half the wavelength (λ 2 / 2).

[0104] Optionally, at least two of the matching circuits include a first matching circuit 20 and a second matching circuit 30, the first matching circuit 20 is connected to a first feeding point S0, and the electrical length formed by the radiation signal connected to the first feeding point S0 on the radiation branch 10, that is, the current path length L 0 The wavelength λ of the incoming RF signal 0 The following relations are satisfied:

[0105] λ 0 / 4<L 0 <λ 0 / 2;

[0106] The second matching circuit 30 is connected to the second feeding point S1 and the third feeding point S2;

[0107] The electrical length formed by the radiation signal connected to the second feeding point S1 on the radiation branch 10, that is, the current path length L 1 The wavelength λ of the RF signal connected to one of the feed points 1 The following relations are satisfied:

[0108] λ 1 / 8<L 1 <λ 1 / 4;

[0109] The electrical length formed by the radiation signal connected to the third feeding point S2 on the radiation branch 10, that is, the current path length L 2 The wavelength λ of the incoming RF signal 1 The following relations are satisfied:

[0110] λ 2 / 8<L 2 <λ 2 / 2.

[0111] In this embodiment, Figure 5 Yes 0 Frequency band equivalent circuit diagram, Figure 6 Yes 0 The Smith impedance circle diagram shows the trend of the frequency band. In the f0 frequency band, the current path is the entire radiation branch 10, and the original port impedance is in the middle of the capacitive area in the lower half of the Smith diagram. In order to achieve the original port impedance in the Smith diagram, the length of the entire radiation branch 10 must meet λ 0 / 4<L 0 <λ 0 / 2.

[0112] Figure 5 In the figure, L2 / C2 / L5 are equivalent to the effect of the series inductor L01. Smith's diagram moves a little to the upper left, and combined with L6, the port impedance can be pulled close to 50Ω.

[0113] Figure 7 Yes 1 Frequency band equivalent circuit diagram, Figure 8 Yes 1 The Smith impedance circle diagram shows the trend of the frequency band. 1 The frequency band current path is the overall radiation branch 10, and the original port impedance is in the lower right position of the upper half of the inductive area in the Smith diagram. In order to achieve the original port impedance in the Smith diagram, the length of the overall radiation branch 10 must meet the length of the radiation branch 1 + radiation branch 2 + radiation branch 3 λ 1 / 8<L 1 <λ1 / 4.

[0114] Figure 7 In the figure, L1 / C1 / L3 / L4 / C3 / C4 are equivalent to the parallel inductor L11 + equivalent series capacitor C11. As shown in the Smith diagram, moving to the upper left first and then to the lower left can bring the port impedance close to 50Ω.

[0115] Fig. 9 Yes 2 Frequency band equivalent circuit diagram, Fig.10 Yes 2 The Smith impedance circle diagram shows the trend of the frequency band. 2 The frequency band current path is radiating branch 2 + radiating branch 1, and the original port impedance is in the upper half of the inductive area on the left side of the Smith diagram. In order to achieve the original port impedance in the Smith diagram, the length of radiating branch 2 + radiating branch 1 must meet the length of radiating branch 1 + radiating branch 2 λ 2 / 8<L 2 <λ 2 / 2.

[0116] Fig. 9 In the figure, L1 / C1 / L3 / L4 / C3 are equivalent to the series inductor L20 + equivalent series capacitor C20. Smith shows that the port impedance can be pulled close to 50Ω by first adjusting it slightly to the position close to 50Ω+jX and then moving to the lower right.

[0117] Fig.11 It is the S11 waveform of all ports. The horizontal axis represents the frequency and the vertical axis represents the port S11. Fig.11 Indicates the three frequency bands of radiation that the entire antenna assembly can achieve. The waveform positions of the three frequency ranges are shown in the figure, where the frequency range is: f 2 >f 0 >f 1 .

[0118] Fig.12 The figure shows the overall position diagram of the antenna structure applied to a smart terminal.

[0119] Fig.13 As shown, the antenna S11 / S21 waveform, S3, 3 is the S parameter waveform under GPS L2 / L5 antenna mode and WIFI 2.4G antenna mode, S4, 4 is the parameter simulation diagram under GPS L1 and WIFI 2.4G antenna mode. The horizontal axis is frequency / GHz, and the vertical axis is S11 / dB. It can be seen from the above figure that the characterization can achieve efficient port energy transmission in three frequency bands. The reference values ​​of all matching components meet L1*C1 at (5035 / f0)

[0120] ±1.5 (nH / pF / MHz), L2*C2 is in the range of (5035 / f1)2±1.5 (nH / pF / MHz), and the S11 waveform requirement of three frequencies close to 50Ω is achieved.

[0121] Fig.14 As shown in the figure, the total efficiency of the antenna is plotted with frequency / GHz on the horizontal axis and efficiency / dB on the vertical axis, which indicates that the antenna can achieve high-efficiency radiation in three frequency bands. It can be concluded that the antenna structure has a good performance under the GPS L1 antenna mode at a frequency of f 0 The peak efficiency is higher than -5dB at (1559MHz~1620MHz). In the GPS L2 / L5 antenna mode, the frequency f 1 (1175MHz~1229MHz) The peak efficiency is higher than -7dB. In the WIFI 2.4G antenna mode, the frequency band f 2 The peak efficiency is higher than -4dB at (2400MHz~2500MHz).

[0122] The present application also proposes a smart terminal, comprising the antenna structure as described above.

[0123] The detailed structure of the antenna structure can be referred to the above-mentioned embodiment, which will not be repeated here; it can be understood that since the above-mentioned antenna structure is used in the intelligent terminal of the present application, the embodiment of the intelligent terminal of the present application includes all the technical solutions of all the embodiments of the above-mentioned antenna structure, and the technical effects achieved are exactly the same, which will not be repeated here.

[0124] The smart terminal also includes a terminal display screen, a terminal mainboard, a shell and a frame. The shell, the display screen and the frame enclose a housing cavity of the smart terminal. The mainboard and the battery panel are housed in the housing cavity. The frame is used to support and fix the terminal display screen embedded in the shell. The antenna structure of this embodiment can be set on the frame. This application is suitable for smart terminals with metal frames such as mobile phones, watches, bracelets, pads and notebooks, but is certainly not limited to metal frames.

[0125] Reference Fig.12 In an optional embodiment, the smart terminal further includes a frame 40, and the radiating branch of the antenna structure is arranged on the frame 40; or, the radiating branch of the antenna structure is integrally arranged with the frame 40.

[0126] In this embodiment, the frame 40 may be a metal frame 40, and the metal frame 40 may serve as the appearance of the mobile terminal, such as the side frame 40 and part or all of the back shell of the mobile terminal. In addition to the GPS antenna, the smart terminal may also be provided with a Bluetooth antenna, a Sub6G MIMO antenna, etc. Each antenna may be provided on the metal frame 40, and a slit 10a may be provided on the metal frame 40 to distinguish different antennas. The slit 10a may be used for tuning, and the tuning is performed according to the change in the width of the slit 10a. The slit 10a may be used to distinguish different antennas. Optionally, when the GPS antenna, the Bluetooth antenna, the Sub6G MIMO antenna, etc. are all implemented by the metal frame 40, the number of the slits 10a may be set to at least two, for distinguishing the GPS antenna, the Bluetooth antenna, the Sub6G MIMO antenna, etc. Optionally, the slit 10a is filled with an isolation material, and nano injection molding technology may be used to isolate and distinguish different antennas.

[0127] Optionally, the antenna structure further includes a ground plate, and the ground plate is electrically connected to the antenna feeding point.

[0128] In this embodiment, the grounding plate can be arranged between the main board and the display screen of the smart terminal. The grounding plate 80 serves as the main ground of the smart terminal. The antenna structure can be directly connected to the grounding plate by using ground isolation ribs, or it can be indirectly connected to the grounding plate by means of grounding connectors, filtering circuits and the system ground of the main board.

[0129] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0130] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0131] The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0132] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An antenna structure, characterized in that: include: A radiation branch, wherein a first end of the radiation branch is suspended in the air and a second end of the radiation branch is grounded; At least two groups of matching circuits, one end of the matching circuit is used to access at least one feeding point, the other end of the matching circuit is electrically connected to the radiation branch, and is sequentially arranged at intervals from the grounding point; The frequencies of the radio frequency signals connected to at least two of the feeding points are different.

2. The antenna structure according to claim 1, characterized in that: The at least two matching circuits include a first matching circuit and a second matching circuit, the first matching circuit is connected to a first feeding point, and the second matching circuit is connected to a second feeding point and a third feeding point; Include at least one of the following: The electrical length formed by the radiation signal connected to the first feeding point on the radiation branch is greater than a quarter wavelength and less than a half wavelength; The electrical length formed on the radiation branch by the radiation signal connected to the second feeding point is greater than one eighth of the wavelength and less than one quarter of the wavelength; The electrical length formed on the radiation branch by the radiation signal connected to the third feeding point is greater than one eighth of the wavelength and less than one half of the wavelength.

3. The antenna structure according to claim 1, characterized in that: The matching circuit comprises: a tuning circuit, one end of which is connected to the feeding point, and the tuning circuit is configured to tune the connected radio frequency signal so that the radio frequency signal is within a predetermined working frequency band; and / or, A filter circuit, one end of the filter circuit is connected to the other end of the tuning circuit, the other end of the filter circuit is electrically connected to the radiation branch, and the filter circuit is configured to filter the connected radio frequency signal and then output it.

4. The antenna structure according to claim 3, characterized in that: At least one of the at least two matching circuits further includes a dual-frequency combiner, one end of the dual-frequency combiner is connected to the tuning circuit, and the other end of the dual-frequency combiner is respectively connected to the two feeding points.

5. The antenna structure according to claim 3, characterized in that: The filter circuit comprises a first capacitor and a first inductor, wherein the first capacitor and the first inductor are arranged in parallel; One end of the first capacitor and the first inductor is connected to the other end of the tuning circuit, and the other end of the first capacitor and the first inductor is electrically connected to the radiation branch.

6. The antenna structure according to claim 3, characterized in that: At least two of the matching circuits include a first matching circuit, a tuning circuit of the first matching circuit includes a second inductor and a third inductor; one end of the second inductor is connected to the filter circuit, the other end of the second inductor is respectively connected to one end of the third inductor and the feeding point, and the other end of the third inductor is grounded; and / or, At least two of the matching circuits include a second matching circuit, and the tuning circuit of the second matching circuit includes a fourth inductor, a fifth inductor, a second capacitor and a third capacitor; one end of the fourth inductor is connected to the filter circuit, and the other end of the fourth inductor is interconnected with one end of the fifth inductor and one end of the second capacitor respectively; the other end of the fifth inductor is grounded; the other end of the second capacitor is interconnected with one end of the third capacitor and the feeding point; the other end of the third capacitor is grounded.

7. The antenna structure according to any one of claims 1 to 6, characterized in that: A current signal is fed into a feeding point connected to at least one of the two matching circuits, so that the radiation branch excites a first mode to generate a radiation signal of a first frequency band; A current signal is fed into a feeding point connected to another one of at least two matching circuits, so that the radiating branch excites a second mode to generate a radiated signal in a second frequency band, and the radiating branch excites a third mode to generate a radiated signal in a third frequency band.

8. An intelligent terminal, characterized in that: The invention comprises the antenna structure as claimed in any one of claims 1 to 7.

9. The intelligent terminal according to claim 8, characterized in that: The smart terminal also includes a frame; The radiating branch of the antenna structure is arranged on the frame; or, the radiating branch of the antenna structure is arranged integrally with the frame.

10. The intelligent terminal according to claim 8, characterized in that: The intelligent terminal further includes: a ground plate, the ground plate being electrically connected to a ground point of the antenna structure; and / or, A main board, on which the matching circuit and the feeding point of the antenna structure are arranged.

Images