CN112259966B - Multi-band antenna structure - Google Patents

Abstract

The invention discloses a multiband antenna structure, which comprises four slots arranged on a metal frame of terminal equipment, wherein the four slots are arranged on two opposite sides of the metal frame, two metal strips are arranged at each slot, and a feed point and a switch lap point are arranged in each metal strip. The 5G multi-band antenna structure with low cost and small structural space requirement is realized, various antenna forms are realized, the coupling and interference between two antennas in the same frequency band are reduced, and the network requirements of multi-band and multi-antenna are met.

Description

Multi-band antenna structure

Technical Field

The present invention relates to the field of mobile communications, and in particular, to a multiband antenna structure.

Background

In the prior art, with the rapid development of intelligent terminal equipment and basic network technology, the popularity of the 5G network is also higher and higher. In the present, three major operators in China have obtained low-frequency band test frequency use permissions in the national range 5G, and from the whole allocation situation, each region and operator have allocated n1/n3/n41/n77/n78/n79 six main frequency bands, wherein n78:3400MHz-3600MHz, china telecom, china Union; n41:2515MHz-2675MHz, china mobile; n79:4400MHz-4900MHz, china movement; n1:1920M-2170M, china telecom and China Unicom are used for carrying out spectrum sharing enhancement 5G coverage with LTE, and are also global 5G main frequency bands; n3:1710M-1880M, china telecom and China Unicom are used for carrying out spectrum sharing enhancement 5G coverage with LTE, and are also global 5G main frequency bands; n77:3300M-4200M Japanese European main band.

Because 5G communication has the characteristics of high rate, large capacity, low delay and the like, multiple Input Multiple Output (MIMO) technology becomes one of key technologies for implementing 5G communication.

However, since the internal space of the terminal device is limited and the 5G frequency band has a high requirement on the layout of the antenna, in the prior art, there is no technical solution capable of meeting the requirements of multiple frequency bands through one module, and the 5G frequency band antenna structure in the prior art occupies more space structure, which may possibly bring a problem of insufficient structural space for the terminal device.

Disclosure of Invention

In order to solve the above technical drawbacks in the prior art, the present invention provides a multiband antenna structure, which includes: the device comprises four slots arranged on a metal frame of the terminal device, wherein the four slots are arranged on two opposite sides of the metal frame, two metal strips are arranged at each slot, and a feed point and a switch lap point are arranged in each metal strip.

Optionally, the four slots are arranged on the left side and the right side of the metal frame in a pairwise manner, and are axially symmetrically distributed on the left side and the right side.

Optionally, a first metal strip and a second metal strip are disposed along the metal frame at a first slot of the four slots, and a clearance area is formed by intermediate areas of the first metal strip and the second metal strip.

Optionally, the first metal strip includes a first feeding point and a first switch overlapping point, where the first feeding point and the first switch overlapping point are 10mm apart.

Optionally, the first feeding point is located at a greater distance from the first slot than the first switch overlap point.

Optionally, the second metal strip includes a second feeding point and a second switch overlapping point, where the second feeding point and the second switch overlapping point are 10mm apart.

Optionally, the distance between the second feeding point and the first slot is smaller than the distance between the second switch overlapping point and the first slot.

Optionally, the second feeding point is located at a distance from the first slot that is less than the distance from the first switch overlap point to the first slot.

Optionally, the antenna structure further includes a circuit module disposed in the first slot, where the circuit module is electrically connected to the first feeding point, the first switch overlapping point, the second feeding point, and the second switch overlapping point, respectively.

Optionally, the length of the first metal strip ranges from 15 to 20mm, and the length of the second metal strip ranges from 15 to 30mm.

According to the multiband antenna structure, the multiband antenna structure comprises four slots arranged on a metal frame of terminal equipment, the four slots are arranged on two opposite sides of the metal frame, two metal strips are arranged at each slot, and a feed point and a switch lap point are arranged in each metal strip. The 5G multi-band antenna structure with low cost and small structural space requirement is realized, various antenna forms are realized, the coupling and interference between two antennas in the same frequency band are reduced, and the network requirements of multi-band and multi-antenna are met.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a schematic diagram of a hardware structure of a mobile terminal according to the present invention;

fig. 2 is a schematic diagram of a communication network system according to an embodiment of the present invention;

fig. 3 is a first structural schematic diagram of the multiband antenna structure according to the present invention;

fig. 4 is a second structural schematic diagram of the multiband antenna structure according to the present invention.

Detailed Description

It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.

In the following description, suffixes such as "module", "component", or "unit" for representing elements are used only for facilitating the description of the present invention, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.

The terminal may be implemented in various forms. For example, the terminals described in the present invention may include mobile terminals such as cell phones, tablet computers, notebook computers, palm computers, personal digital assistants (Personal Digital Assistant, PDA), portable media players (Portable Media Player, PMP), navigation devices, wearable devices, smart bracelets, pedometers, and fixed terminals such as digital TVs, desktop computers, and the like.

The following description will be given taking a mobile terminal as an example, and those skilled in the art will understand that the configuration according to the embodiment of the present invention can be applied to a fixed type terminal in addition to elements particularly used for a moving purpose.

Referring to fig. 1, which is a schematic diagram of a hardware structure of a mobile terminal implementing various embodiments of the present invention, the mobile terminal 100 may include: an RF (Radio Frequency) unit 101, a WiFi module 102, an audio output unit 103, an a/V (audio/video) input unit 104, a sensor 105, a display unit 106, a user input unit 107, an interface unit 108, a memory 109, a processor 110, and a power supply 111. Those skilled in the art will appreciate that the mobile terminal structure shown in fig. 1 is not limiting of the mobile terminal and that the mobile terminal may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.

The following describes the components of the mobile terminal in detail with reference to fig. 1:

the radio frequency unit 101 may be used for receiving and transmitting signals during the information receiving or communication process, specifically, after receiving downlink information of the base station, processing the downlink information by the processor 110; and, the uplink data is transmitted to the base station. Typically, 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, and the like. In addition, the radio frequency unit 101 may also communicate with networks and other devices via wireless communications. The wireless communication may use any communication standard or protocol, including but not limited to GSM (Global System of Mobile communication, global System for Mobile communications), GPRS (General Packet Radio Service ), CDMA2000 (Code Division Multiple Access, CDMA 2000), WCDMA (Wideband Code Division Multiple Access ), TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, time Division synchronous code Division multiple Access), FDD-LTE (Frequency Division Duplexing-Long Term Evolution, frequency Division Duplex Long term evolution), and TDD-LTE (Time Division Duplexing-Long Term Evolution, time Division Duplex Long term evolution), etc.

WiFi belongs to a short-distance wireless transmission technology, and a mobile terminal can help a user to send and receive e-mails, browse web pages, access streaming media and the like through the WiFi module 102, so that wireless broadband Internet access is provided for the user. Although fig. 1 shows a WiFi module 102, it is understood that it does not belong to the necessary constitution of a mobile terminal, and can be omitted entirely as required within a range that does not change the essence of the invention.

The audio output unit 103 may convert audio data received by the radio frequency unit 101 or the WiFi module 102 or stored in the memory 109 into an audio signal and output 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, or the like. Also, the audio output unit 103 may also provide audio output (e.g., a call signal reception sound, a message reception sound, etc.) related to a specific function performed by the mobile terminal 100. The audio output unit 103 may include a speaker, a buzzer, and the like.

The a/V input unit 104 is used to receive an audio or video signal. The a/V input unit 104 may include a graphics processor (Graphics Processing Unit, GPU) 1041 and a microphone 1042, the graphics processor 1041 processing image data of still pictures or video obtained by an image capturing device (e.g., a camera) in a video capturing mode or an image capturing mode. The processed image frames may be displayed on the display unit 106. The image frames processed by the graphics processor 1041 may be stored in the memory 109 (or other storage medium) or transmitted 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 phone call mode, a recording mode, a voice recognition mode, and the like, and can process such sound into audio data. The processed audio (voice) data may be converted into a format output that can be transmitted to the mobile communication base station via the radio frequency unit 101 in the case of a telephone call mode. The microphone 1042 may implement various types of noise cancellation (or suppression) algorithms to cancel (or suppress) noise or interference generated in the course of receiving and transmitting the audio signal.

The mobile terminal 100 also includes at least one sensor 105, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor, wherein the ambient light sensor can adjust the brightness of the display panel 1061 according to the brightness of ambient light, and the proximity sensor can turn off the display panel 1061 and/or the backlight when the mobile terminal 100 moves to the ear. As one of the motion sensors, the accelerometer sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and direction when stationary, and can be used for applications of recognizing the gesture of a mobile phone (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking), and the like; as for other sensors such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, infrared sensors, etc. that may also be configured in the mobile phone, the detailed description thereof will be omitted.

The display unit 106 is used to display information input by a user or information provided to the user. The display unit 106 may include a display panel 1061, and the display panel 1061 may be configured in the form of a liquid crystal display (Liquid Crystal Display, LCD), an Organic Light-Emitting Diode (OLED), or the like.

The user input unit 107 may be used to receive input numeric or character information and to generate key signal inputs related to user settings and function control of the mobile terminal. In particular, the user input unit 107 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also referred to as a touch screen, may collect touch operations thereon or thereabout by a user (e.g., operations of the user on the touch panel 1071 or thereabout by using any suitable object or accessory such as a finger, a stylus, etc.) and drive the corresponding connection device according to a predetermined program. The touch panel 1071 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch azimuth of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, and sends the touch point coordinates to the processor 110, and can receive and execute commands sent from the processor 110. Further, the touch panel 1071 may be implemented in various types such as resistive, capacitive, infrared, and surface acoustic wave. The user input unit 107 may include other input devices 1072 in addition to the touch panel 1071. In particular, other input devices 1072 may include, but are not limited to, one or more of a physical keyboard, function keys (e.g., volume control keys, switch keys, etc.), a trackball, mouse, joystick, etc., as specifically not limited herein.

Further, the touch panel 1071 may overlay the display panel 1061, and when the touch panel 1071 detects a touch operation thereon or thereabout, the touch panel 1071 is transferred to the processor 110 to determine the type of touch event, and then the processor 110 provides a corresponding visual output on the display panel 1061 according to the type of touch event. Although in fig. 1, the touch panel 1071 and the display panel 1061 are two independent components for implementing the input and output functions of the mobile terminal, in some embodiments, the touch panel 1071 may be integrated with the display panel 1061 to implement the input and output functions of the mobile terminal, which is not limited herein.

The interface unit 108 serves as an interface through which at least one external device can be connected with the mobile terminal 100. For example, the external devices may include a wired or wireless headset port, an external power (or battery charger) port, a wired or wireless data port, a memory card port, a port for connecting a device having an identification module, an audio input/output (I/O) port, a video I/O port, an earphone port, and the like. 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.

Memory 109 may be used to store software programs as well as various data. The memory 109 may mainly include a storage program area that may store an operating system, application programs required for at least one function (such as a sound playing function, an image playing function, etc.), and a storage data area; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, memory 109 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device.

The processor 110 is a control center of the mobile terminal, connects various parts of the entire mobile terminal using various interfaces and lines, and performs 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, thereby performing overall monitoring of the mobile terminal. Processor 110 may include one or more processing units; preferably, the processor 110 may integrate an application processor that primarily handles operating systems, user interfaces, applications, etc., with a modem processor that primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 110.

The mobile terminal 100 may further include a power source 111 (e.g., a battery) for supplying power to the respective components, and preferably, the power source 111 may be logically connected to the processor 110 through a power management system, so as to perform functions of managing charging, discharging, and power consumption management through the power management system.

Although not shown in fig. 1, the mobile terminal 100 may further include a bluetooth module or the like, which is not described herein.

In order to facilitate understanding of the embodiments of the present invention, a communication network system on which the mobile terminal of the present invention is based will be described below.

Referring to fig. 2, fig. 2 is a schematic diagram of a communication network system according to an embodiment of the present invention, where the communication network system is an LTE system of a general 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, evolved packet core) 203, and an IP service 204 of an operator that are sequentially connected in communication.

Specifically, the UE201 may be the terminal 100 described above, and will not be described herein.

The E-UTRAN202 includes eNodeB2021 and other eNodeB2022, etc. The eNodeB2021 may be connected with other eNodeB2022 by a backhaul (e.g., an X2 interface), the eNodeB2021 is connected to the EPC203, and the eNodeB2021 may provide access from the UE201 to the EPC 203.

EPC203 may include MME (Mobility Management Entity ) 2031, hss (Home Subscriber Server, home subscriber server) 2032, other MMEs 2033, SGW (Serving Gate Way) 2034, pgw (PDN Gate Way) 2035 and PCRF (Policy and Charging Rules Function, policy and tariff function entity) 2036, and so on. The MME2031 is a control node that handles signaling between the UE201 and EPC203, providing bearer and connection management. HSS2032 is used to provide registers to manage functions such as home location registers (not shown) and to hold user specific information about service characteristics, data rates, etc. All user data may be sent through SGW2034 and PGW2035 may provide IP address allocation and other functions for UE201, PCRF2036 is a policy and charging control policy decision point for traffic data flows and IP bearer resources, which selects and provides available policy and charging control decisions for a policy and charging enforcement function (not shown).

IP services 204 may include the internet, intranets, IMS (IP Multimedia Subsystem ), or other IP services, etc.

Although the LTE system is described above as an example, it should be understood by those skilled in the art that the present invention is not limited to LTE systems, but may be applied to other wireless communication systems, such as GSM, CDMA2000, WCDMA, TD-SCDMA, and future new network systems.

Based on the above mobile terminal hardware structure and the communication network system, various embodiments of the method of the present invention are provided.

Example 1

Fig. 3 is a schematic diagram of a first structure of the multiband antenna structure according to the present invention. The embodiment provides a multiband antenna structure, which comprises: the device comprises four slots arranged on a metal frame of the terminal device, wherein the four slots are arranged on two opposite sides of the metal frame, two metal strips are arranged at each slot, and a feed point and a switch lap point are arranged in each metal strip.

Optionally, in this embodiment, under a normal holding posture of the terminal device, two slots are respectively provided on the metal frames on the left and right sides of the terminal device, where four slots are provided perpendicular to the left and right sides;

alternatively, in this embodiment, the four slots have a width in the range of 1-2mm;

optionally, in this embodiment, four slots are formed on the metal frame of the terminal device to form four antenna units;

optionally, in this embodiment, each of the four antenna units formed by the four slots and the metal frame may meet the requirement of multiple frequency bands of 5G communication, and may be combined into an antenna structure form such as 2 x 2mm o (Multi Input Multi Output, multiple positions), 4 x 4 mm o, or 8 x 8 mm o;

optionally, in this embodiment, a metal strip is disposed on each side of each slot, specifically, a signal in the n1/n3/n41/n78/n77 frequency band is generated by the upper metal strip, and a signal in the n1/n3/n41/n79 frequency band is generated by the lower metal strip, so that a four-antenna unit formed by four slots and a metal frame can generate 8×8mimo antenna at most;

optionally, in this embodiment, the frequency bands generated by each metal strip are adjusted accordingly according to the needs of the operators or the design requirements. For example, the n1/n3/n41/n78/n77 frequency band is generated by using the upper metal strip, and the n41/n79 frequency band is generated by using the lower metal strip, so that the length of the whole antenna unit can be effectively shortened, wherein the length of the lower metal strip can be adjusted to be about 20mm;

alternatively, in the present embodiment, considering that the n77/n78/n79 band is wide in bandwidth and the n77/n78 band is close, it is difficult to realize the above three bands simultaneously on one metal strip, and therefore, the n77/n78 band is realized by using the upper metal strip and the n79 band is realized by using the lower metal strip.

The beneficial effects of this embodiment lie in, through providing a multiband antenna structure, this antenna structure is including setting up in four slots of the metal frame of terminal equipment, four the slot every two by two set up in the opposite both sides of metal frame, at every slot department sets up two metal strips, in every set up a feed point and a switch overlap point in the metal strip. The 5G multi-band antenna structure with low cost and small structural space requirement is realized, various antenna forms are realized, the coupling and interference between two antennas in the same frequency band are reduced, and the network requirements of multi-band and multi-antenna are met.

Example two

Fig. 4 is a second structural schematic diagram of the multiband antenna structure according to the present invention. Based on the above embodiment, in this embodiment, optionally, four slots are disposed on the left and right sides of the metal frame in pairs, and are axisymmetrically distributed on the left and right sides.

Optionally, in this embodiment, a first metal strip and a second metal strip are disposed along the metal frame at a first slot of the four slots, and a clearance area is formed by intermediate areas of the first metal strip and the second metal strip.

Alternatively, in the present embodiment, four antenna elements are formed by four slots and a metal bezel. In the description of the antenna unit 1, it is to be understood that the same functions or combinations of the antenna unit 2, the antenna unit 3, and the antenna unit 4 may be implemented in the same manner. Specifically, in the antenna unit 1, from the upper part to the lower part of the terminal device, the switch 1, the feeding point 2 and the switch 2 are sequentially included, wherein the switch 1 includes four switches RF11, RF12, RF13 and RF14, and the switch 2 includes four switches RF21, RF22, RF23 and RF 24.

In this embodiment, the antenna unit 1 includes a metal frame of the mobile phone and a corresponding circuit module, and the circuit module includes four connection points, that is, four connection points where the metal frame is connected to the circuit module are disposed on the metal frame. The overlap point of the feeding point 1 and the switch 1 can be flexibly selected, alternatively the feeding point 1 and the switch 1 are spaced apart by about 10mm, and the feeding point 1 is positioned farther from the slit than the position of the switch 1. Meanwhile, the distance between the overlapping point of the feeding point 2 and the gap is nearest among the four overlapping points, and meanwhile, the distance between the switch 2 and the feeding point 2 is about 10mm. From this, it can be seen that in this embodiment, the metal strip 1 and the metal strip 2 are used as antenna radiators, and the mutual interference between the two can be reduced while the 5G frequency bands can be generated respectively.

Specifically, in the present embodiment, first, the lengths of the metal strips 1 and 2 are structurally determined. When the switch of the circuit does not work, the lengths of the metal strip 1 and the metal strip 2 are exactly n1 frequency bands; then, the switch 1 and the switch 2 are turned on, the upper part of the slot (metal strip 1) can generate n3/n41/n78/n77 frequency bands, and at the same time, the lower part of the slot (metal strip 2) can generate n3/n41/n79 frequency bands.

Specifically, in the present embodiment, for the switch 1, an n1 band is generated when the switch 1 is turned off (off); when the RF11 is connected and adds 1pf capacitor, n3 frequency band is generated; when the RF12 is connected and added with 4nh of inductance, n41 frequency bands are generated; when RF13 is turned on plus a 0 ohm resistor, an n78 band is produced. Thus, it can be seen that under normal conditions, when the switch 1 is off, the resonant frequency is not necessarily exactly in the n1 frequency band, and therefore, the resonant frequency required for n1 can be adjusted by using the RF 4-way on-capacitor or inductor.

Optionally, in this embodiment, the first metal strip includes a first feeding point and a first switch overlapping point, where the first feeding point and the first switch overlapping point are spaced apart by 10mm.

Optionally, in this embodiment, a distance between the first feeding point and the first slot is greater than a distance between the first switch overlap point and the first slot.

Optionally, in this embodiment, a second feeding point and a second switch overlapping point are included in the second metal strip, where the second feeding point and the second switch overlapping point are 10mm apart.

Optionally, in this embodiment, a distance between the second feeding point and the first slot is smaller than a distance between the second switch overlap point and the first slot.

Optionally, in this embodiment, a distance between the second feeding point and the first slot is smaller than a distance between the first switch overlap point and the first slot.

Optionally, in this embodiment, the antenna structure further includes a circuit module disposed inside the first slot, and the circuit module is electrically connected to the first feeding point, the first switch overlapping point, the second feeding point, and the second switch overlapping point respectively.

Alternatively, in this embodiment, the length of the first metal strip ranges from 15 to 20mm and the length of the second metal strip ranges from 15 to 30mm.

The beneficial effect of this embodiment lies in that, through providing above-mentioned a multifrequency section antenna structure, realized a with low costs, the 5G multifrequency section antenna structure that the space requirement is little, realized multiple antenna form, reduced the coupling and the interference of two antennas between the same frequency channel, satisfied the network demand of multifrequency section and multifrequency section simultaneously.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.

The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.

Claims (2)

1. A multi-band antenna structure, the antenna structure comprising: four slots arranged on a metal frame of the terminal equipment, wherein the four slots are arranged on two opposite sides of the metal frame, two metal strips are arranged at each slot, and a feed point and a switch lap point are arranged in each metal strip;

among four antenna units formed by the four slots and the metal frame, each antenna unit is used for realizing the requirement of multiple frequency bands of 5G communication; a metal strip is disposed on each side of each slot, wherein: generating signals of n1/n3/n41/n78/n77 frequency bands through the upper metal strip, generating signals of n1/n3/n41/n79 frequency bands through the lower metal strip, and generating 8 x 8mimo antenna forms through four antenna units formed by four slots and a metal frame; alternatively, the n1/n3/n41/n78/n77 frequency band is generated by the upper metal bar, and the n41/n79 frequency band is generated by the lower metal bar, whereby the length of the lower metal bar can be adjusted to 20mm; or the n77/n78 frequency band is realized through the upper part metal strip, and the n79 frequency band is realized through the lower part metal strip;

the four slots are arranged on the left side and the right side of the metal frame in a pairwise manner and are axially symmetrically distributed on the left side and the right side;

a first metal strip and a second metal strip are arranged at a first slot in the four slots along the metal frame, and a clearance area is formed by the middle areas of the first metal strip and the second metal strip;

in one of the antenna units, from the upper part to the lower part of the terminal device, a first switch, a first feeding point, a second feeding point and a second switch are sequentially included, wherein the first switch comprises an RF11 switch, an RF12 switch, an RF13 switch and an RF14 switch, and the second switch comprises an RF21 switch, an RF22 switch, an RF23 switch and an RF24 switch;

the first metal strip comprises the first feeding point and a first switch lap joint point, wherein the distance between the first feeding point and the first switch lap joint point is 10mm;

the distance between the first feeding point and the first slot is larger than the distance between the first switch lapping point and the first slot;

the second metal strip comprises a second feeding point and a second switch lap point, wherein the distance between the second feeding point and the second switch lap point is 10mm;

the distance between the second feeding point and the first slot is smaller than the distance between the second switch lapping point and the first slot;

the distance between the second feeding point and the first slot is smaller than the distance between the first switch lapping point and the first slot;

the antenna structure further comprises a circuit module arranged in the first slot, and the circuit module is electrically connected with the first feed point, the first switch lap point, the second feed point and the second switch lap point respectively.

2. The multiband antenna structure according to claim 1, wherein the length of the first metal strip ranges from 15 to 20mm, and the length of the second metal strip ranges from 15 to 30mm.