CN215771542U

CN215771542U - Three-mode broadband terminal antenna and terminal equipment

Info

Publication number: CN215771542U
Application number: CN202121190190.XU
Authority: CN
Inventors: 张澳芳; 褚少杰; 郭超
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-05-28
Filing date: 2021-05-28
Publication date: 2022-02-08
Anticipated expiration: 2031-05-28

Abstract

The application relates to the technical field of wireless communication, and provides a three-mode broadband terminal antenna and terminal equipment, and the antenna comprises: the first radiation branch, the second radiation branch, the third radiation branch, the first matching network and the second matching network; the first radiation branch is electrically connected with the second radiation branch; the first matching network is electrically connected with the feeding point and the second radiation branch; the second matching network is equivalently connected with the third radiation branch section; the first radiation branch and the second radiation branch are used for being excited by a first frequency band signal to form a first resonance mode under the action of the first matching network; the second radiation branch is used for being excited by a second frequency band signal to play a second resonance mode under the action of the first matching network; the third radiation branch node is used for being excited by a third frequency band signal to play a third resonant mode under the action of the second matching network. The antenna supports a plurality of resonance modes, the coverage bandwidth is wide under the condition of extremely small headroom, a tuning switch is not required to be added to tune the frequency band of the antenna, and the cost of the antenna is reduced.

Description

Three-mode broadband terminal antenna and terminal equipment

Technical Field

The application relates to the technical field of wireless communication, in particular to a three-mode broadband terminal antenna and terminal equipment.

Background

With the rapid development of terminal equipment and the increasing use requirements of people, the terminal equipment with a full screen is more and more widely applied to the production and life of people. The terminal device of the full-face screen usually needs a metal iron frame as large as possible to support the whole structure, which results in that the antenna clearance becomes small, the antenna efficiency is low, and the frequency band covered by the antenna is narrow.

In order to enable a product to support a wider frequency band, and ensure the product specification while ensuring the antenna efficiency, for example, to cover communication frequency bands such as LTE B1, B2, B3, B4, B7, B38, B39, B40, and B41 in the range of 1.71GHz to 2.69GHz, the current method is to add a tuning switch, connect different matching networks through different paths of the tuning switch, and each matching network can ensure the antenna performance of the corresponding frequency band during communication. In the communication process, the terminal equipment switches different matching networks by switching the paths of the tuning switches, so that the antenna efficiency of the antenna in the working of a plurality of frequency bands is ensured.

However, the way of using the tuning switch to switch different matching networks to be compatible with multiple frequency bands results in higher cost of the antenna and reduced reliability of the antenna due to the addition of the tuning switch in the circuit.

SUMMERY OF THE UTILITY MODEL

The application provides a three-mode broadband terminal antenna and terminal equipment, this antenna supports a plurality of resonant modes, under minimum headroom, can realize the bandwidth of broad and cover, need not to add the tuning switch tuning antenna frequency channel, has the effect that reduces the antenna cost, and can improve the antenna efficiency under the state of holding.

In a first aspect, a triple-mode broadband terminal antenna is provided, which includes a first radiation branch, a second radiation branch, a third radiation branch, a first matching network and a second matching network; the first radiating branch is electrically connected with the second radiating branch;

the first matching network is electrically connected with the feeding point and the second radiation branch; the second matching network is equivalently connected with the third radiation branch section; the first radiation branch and the second radiation branch are used for being excited by a first frequency band signal to form a first resonance mode under the action of the first matching network; the second radiation branch is used for being excited by a second frequency band signal to form a second resonance mode under the action of the first matching network; and the third radiation branch node is used for being excited by a third frequency band signal to play a third resonance mode under the action of the second matching network.

By additionally arranging the first radiation branch on the basis of the second radiation branch, the antenna can support the first resonance mode of the first frequency band signal while supporting the second resonance mode of the original second frequency band signal and the third resonance mode of the original third frequency band signal. Therefore, the bandwidth of the antenna is not required to be expanded by using a tuning switch, and different frequency bands are not required to be adapted by using multiple groups of matching networks, so that the cost is reduced under the condition of ensuring that the antenna has broadband characteristics. Meanwhile, as the tuning switch and other matching networks are reduced, the failure rate of hardware is reduced, and the reliability of the antenna is improved. In addition, due to the fact that other matching networks are reduced, debugging work for the matching networks is correspondingly reduced, compared with the traditional situation that the matching networks corresponding to each frequency band are debugged one by one, debugging amount is reduced, debugging time is correspondingly shortened, and therefore research and development efficiency of the antenna is improved.

Optionally, a gap is formed in the second radiation branch, the gap is arranged along the length direction of the second radiation branch, an open end of the gap is located at one end, far away from the first radiation branch, of the second radiation branch, and the length of the gap is smaller than that of the second radiation branch.

Through set up the gap on the second radiation minor matters, and the open end of gap is located the one end of keeping away from first radiation minor matters of second radiation minor matters, even under the state of holding, also can make an electric field strong point of second radiation minor matters be in the one end that the second radiation minor matters is close to the third radiation minor matters always, therefore along with the promotion of frequency, the efficiency reduction amplitude that antenna efficiency leads to because holding has reduced the influence that the staff held to the antenna performance.

Optionally, the first radiating branch is an L-shaped structure.

The first radiation branch of the L-shaped structure can ensure the electrical length of the first radiation branch and the second radiation branch, and meanwhile, the wiring can be flexibly conducted at the corner position, so that the arrangement of the antenna in the whole machine is facilitated.

Optionally, corners of the L-shaped structure are rounded.

Optionally, the grounding point of the second radiation branch is disposed at an end of the second radiation branch close to the first radiation branch.

Under the condition that the first radiating branch is of an L-shaped structure, the grounding point of the second radiating branch is arranged at one end, close to the first radiating branch, of the second radiating branch, so that the grounding point of the second radiating branch can be close to the corner of the terminal equipment as far as possible, and the transverse mode and the longitudinal mode of the metal floor are excited, and the antenna efficiency is improved.

Optionally, the first radiating branch and the second radiating branch are seamlessly connected.

Optionally, a connection point of the first matching network and the second radiation branch is disposed at one end of the second radiation branch close to the third radiation branch.

Because the one end of second radiation branch far away from the third radiation branch often arranges more other devices, consequently with the tie point of first matching network and second radiation branch, set up the one end that is close to the third radiation branch in the second radiation branch, can keep away from other devices, avoid being disturbed, ensure antenna performance.

Optionally, a connection point of the second matching network and the third radiation branch is disposed at an end of the third radiation branch far from the second radiation branch.

For the third radiation branch, the open end is the end close to the second radiation branch, and the connection point of the second matching network and the third radiation branch is arranged at the end far away from the second radiation branch, so that the grounding point of the third radiation branch is far away from the open end, and the antenna efficiency is further improved.

Optionally, the first resonance mode is a half-wavelength resonance mode of the first radiation branch and the second radiation branch, the second resonance mode is a quarter-wavelength resonance mode of the second radiation branch, and the third resonance mode is a quarter-wavelength resonance mode of the third radiation branch.

Take the first frequency band signal as 2.6GHz or nearby frequency signal, the second frequency band signal as 1.75GHz or nearby frequency signal, the third frequency band signal as 2.2GHz or nearby frequency signal as an example: when a first frequency band signal enters the antenna, the first radiation branch and the second radiation branch are excited to form a half-wavelength resonance mode; when a second frequency band signal enters the antenna, the second radiation branch is excited to form a quarter-wavelength resonance mode; when a third frequency band signal enters the antenna, the third radiating stub is excited into a quarter-wave resonant mode. Therefore, the antenna can ensure the antenna efficiency in a section of frequency range with 2.6GHz, 2.2GHz and 1.75GHz as centers, for example, the antenna performance can cover the communication frequency bands of LTE B1, B2, B3, B4, B7, B38, B39, B40, B41 and the like in the range of 1.71GHz to 2.69GHz, and the requirement of wireless communication can be met.

In a second aspect, a terminal device is provided, which includes any one of the three-mode broadband terminal antennas in the technical solutions of the first aspect.

Optionally, the antenna is arranged along one short side or corner of the terminal device.

Drawings

Fig. 1 is a schematic structural diagram of an example of a terminal device 100 according to an embodiment of the present application;

fig. 2 is a schematic diagram of an example of a position of an antenna in a terminal device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an antenna radiation unit and a dielectric substrate provided in an embodiment of the present application;

fig. 4 is a schematic diagram of a conventional antenna;

fig. 5 is a schematic structural diagram of an exemplary three-mode broadband terminal antenna according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of another example of a three-mode broadband terminal antenna according to the embodiment of the present application;

fig. 7 is a schematic structural diagram of another example of a three-mode broadband terminal antenna according to the embodiment of the present application;

fig. 8 is a schematic structural diagram of another example of a three-mode broadband terminal antenna according to an embodiment of the present application;

fig. 9 is a schematic diagram illustrating a relative position between an antenna and a human body when a terminal device is held by a user according to an embodiment of the present application;

fig. 10 is a graph illustrating antenna efficiency in the case where a slot is formed in the second radiation branch and the case where no slot is formed in the second radiation branch according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of another example of a three-mode broadband terminal antenna according to the embodiment of the present application;

fig. 12 is a schematic structural diagram of another example of a three-mode broadband terminal antenna according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of another example of a three-mode broadband terminal antenna according to the embodiment of the present application;

fig. 14 is a schematic size diagram of an exemplary three-mode broadband terminal antenna according to an embodiment of the present disclosure;

FIG. 15 is a graph of the reflection coefficient of the antenna shown in FIG. 14;

FIG. 16 is a graph of antenna efficiency for the antenna shown in FIG. 14;

fig. 17 is a distribution diagram of a current in a half-wavelength resonant mode when the first radiation branch and the second radiation branch are excited according to an example of the present application;

FIG. 18 is a graph illustrating an exemplary distribution of current in a quarter-wave resonant mode when the second radiating branch is excited according to an embodiment of the present disclosure;

FIG. 19 is a diagram illustrating an exemplary distribution of current in a quarter-wave resonant mode when the third radiating branch is excited according to an embodiment of the present disclosure;

FIG. 20 is a graph comparing antenna efficiency of the antenna shown in FIG. 14 with that of a conventional example;

fig. 21 is a graph comparing the antenna efficiency of the antenna shown in fig. 14 with that of another conventional antenna.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of the embodiments herein, "/" means "or" unless otherwise specified, for example, a/B may mean a or B; "and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more than two.

In the following, the terms "first", "second" and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", "third" may explicitly or implicitly include one or more of the features.

The three-mode broadband terminal antenna provided by the embodiment of the application can be applied to mobile phones, tablet computers, wearable devices, vehicle-mounted devices, Augmented Reality (AR)/Virtual Reality (VR) devices, notebook computers, ultra-mobile personal computers (UMPCs), netbooks, Personal Digital Assistants (PDAs) and other terminal devices, and the embodiment of the application does not limit the specific types of the terminal devices at all.

For example, fig. 1 is a schematic structural diagram of an example of a terminal device 100 provided in the embodiment of the present application. The terminal device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identification Module (SIM) card interface 195, and the like. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It is to be understood that the illustrated structure of the embodiment of the present application does not constitute a specific limitation to the terminal device 100. In other embodiments of the present application, terminal device 100 may include more or fewer components than shown, or some components may be combined, some components may be split, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

Processor 110 may include one or more processing units, such as: the processor 110 may include an Application Processor (AP), a modem processor, a Graphics Processing Unit (GPU), an Image Signal Processor (ISP), a controller, a memory, a video codec, a Digital Signal Processor (DSP), a baseband processor, and/or a neural-Network Processing Unit (NPU), etc. The different processing units may be separate devices or may be integrated into one or more processors.

The controller may be a neural center and a command center of the terminal device 100, among others. The controller can generate an operation control signal according to the instruction operation code and the timing signal to complete the control of instruction fetching and instruction execution.

A memory may also be provided in processor 110 for storing instructions and data. In some embodiments, the memory in the processor 110 is a cache memory. The memory may hold instructions or data that have just been used or recycled by the processor 110. If the processor 110 needs to reuse the instruction or data, it can be called directly from the memory. Avoiding repeated accesses reduces the latency of the processor 110, thereby increasing the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc.

The I2C interface is a bi-directional synchronous serial bus that includes a serial data line (SDA) and a Serial Clock Line (SCL). In some embodiments, processor 110 may include multiple sets of I2C buses. The processor 110 may be coupled to the touch sensor 180K, the charger, the flash, the camera 193, etc. through different I2C bus interfaces, respectively. For example: the processor 110 may be coupled to the touch sensor 180K through an I2C interface, so that the processor 110 and the touch sensor 180K communicate through an I2C bus interface to implement the touch function of the terminal device 100.

The I2S interface may be used for audio communication. In some embodiments, processor 110 may include multiple sets of I2S buses. The processor 110 may be coupled to the audio module 170 via an I2S bus to enable communication between the processor 110 and the audio module 170. In some embodiments, the audio module 170 may communicate audio signals to the wireless communication module 160 via the I2S interface, enabling answering of calls via a bluetooth headset.

The PCM interface may also be used for audio communication, sampling, quantizing and encoding analog signals. In some embodiments, the audio module 170 and the wireless communication module 160 may be coupled by a PCM bus interface. In some embodiments, the audio module 170 may also transmit audio signals to the wireless communication module 160 through the PCM interface, so as to implement a function of answering a call through a bluetooth headset. Both the I2S interface and the PCM interface may be used for audio communication.

The UART interface is a universal serial data bus used for asynchronous communications. The bus may be a bidirectional communication bus. It converts the data to be transmitted between serial communication and parallel communication. In some embodiments, a UART interface is generally used to connect the processor 110 with the wireless communication module 160. For example: the processor 110 communicates with a bluetooth module in the wireless communication module 160 through a UART interface to implement a bluetooth function. In some embodiments, the audio module 170 may transmit the audio signal to the wireless communication module 160 through a UART interface, so as to realize the function of playing music through a bluetooth headset.

MIPI interfaces may be used to connect processor 110 with peripheral devices such as display screen 194, camera 193, and the like. The MIPI interface includes a Camera Serial Interface (CSI), a Display Serial Interface (DSI), and the like. In some embodiments, processor 110 and camera 193 communicate through a CSI interface to implement the capture function of terminal device 100. The processor 110 and the display screen 194 communicate through the DSI interface to implement the display function of the terminal device 100.

The GPIO interface may be configured by software. The GPIO interface may be configured as a control signal and may also be configured as a data signal. In some embodiments, a GPIO interface may be used to connect the processor 110 with the camera 193, the display 194, the wireless communication module 160, the audio module 170, the sensor module 180, and the like. The GPIO interface may also be configured as an I2C interface, an I2S interface, a UART interface, a MIPI interface, and the like.

The USB interface 130 is an interface conforming to the USB standard specification, and may specifically be a Mini USB interface, a Micro USB interface, a USB Type C interface, or the like. The USB interface 130 may be used to connect a charger to charge the terminal device 100, and may also be used to transmit data between the terminal device 100 and a peripheral device. And the earphone can also be used for connecting an earphone and playing audio through the earphone. The interface may also be used to connect other terminal devices, such as AR devices and the like.

It should be understood that the interface connection relationship between the modules illustrated in the embodiment of the present application is only an exemplary illustration, and does not constitute a limitation on the structure of the terminal device 100. In other embodiments of the present application, the terminal device 100 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.

The charging management module 140 is configured to receive charging input from a charger. The charger may be a wireless charger or a wired charger. In some wired charging embodiments, the charging management module 140 may receive charging input from a wired charger via the USB interface 130. In some wireless charging embodiments, the charging management module 140 may receive a wireless charging input through a wireless charging coil of the terminal device 100. The charging management module 140 may also supply power to the terminal device through the power management module 141 while charging the battery 142.

The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140 and provides power to the processor 110, the internal memory 121, the external memory, the display 194, the camera 193, the wireless communication module 160, and the like. The power management module 141 may also be used to monitor parameters such as battery capacity, battery cycle count, battery state of health (leakage, impedance), etc. In some other embodiments, the power management module 141 may also be disposed in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 may be disposed in the same device.

The wireless communication function of the terminal device 100 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, a modem processor, a baseband processor, and the like.

The

antennas

1 and 2 are used for transmitting and receiving electromagnetic wave signals. The structure of the antenna 1 and the antenna 2 in fig. 1 is merely an example. Each antenna in terminal device 100 may be used to cover a single or multiple communication bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: the antenna 1 may be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied on the terminal device 100. The mobile communication module 150 may include at least one filter, a switch, a power amplifier, a Low Noise Amplifier (LNA), and the like. The mobile communication module 150 may receive the electromagnetic wave from the antenna 1, filter, amplify, etc. the received electromagnetic wave, and transmit the electromagnetic wave to the modem processor for demodulation. The mobile communication module 150 may also amplify the signal modulated by the modem processor, and convert the signal into electromagnetic wave through the antenna 1 to radiate the electromagnetic wave. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the processor 110. In some embodiments, at least some of the functional modules of the mobile communication module 150 may be disposed in the same device as at least some of the modules of the processor 110.

The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then passes the demodulated low frequency baseband signal to a baseband processor for processing. The low frequency baseband signal is processed by the baseband processor and then transferred to the application processor. The application processor outputs a sound signal through an audio device (not limited to the speaker 170A, the receiver 170B, etc.) or displays an image or video through the display screen 194. In some embodiments, the modem processor may be a stand-alone device. In other embodiments, the modem processor may be provided in the same device as the mobile communication module 150 or other functional modules, independent of the processor 110.

The wireless communication module 160 may provide a solution for wireless communication applied to the terminal device 100, including Wireless Local Area Networks (WLANs) (e.g., wireless fidelity (Wi-Fi) networks), bluetooth (bluetooth, BT), Global Navigation Satellite System (GNSS), Frequency Modulation (FM), Near Field Communication (NFC), Infrared (IR), and the like. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2, performs frequency modulation and filtering processing on electromagnetic wave signals, and transmits the processed signals to the processor 110. The wireless communication module 160 may also receive a signal to be transmitted from the processor 110, perform frequency modulation and amplification on the signal, and convert the signal into electromagnetic waves through the antenna 2 to radiate the electromagnetic waves.

In some embodiments, the antenna 1 of the terminal device 100 is coupled to the mobile communication module 150 and the antenna 2 is coupled to the wireless communication module 160 so that the terminal device 100 can communicate with a network and other devices through wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), General Packet Radio Service (GPRS), code division multiple access (code division multiple access, CDMA), Wideband Code Division Multiple Access (WCDMA), time-division code division multiple access (time-division code division multiple access, TD-SCDMA), Long Term Evolution (LTE), LTE, BT, GNSS, WLAN, NFC, FM, and/or IR technologies, etc. The GNSS may include a Global Positioning System (GPS), a global navigation satellite system (GLONASS), a beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and/or a Satellite Based Augmentation System (SBAS).

The terminal device 100 implements a display function by the GPU, the display screen 194, and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and an application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. The processor 110 may include one or more GPUs that execute program instructions to generate or alter display information.

The display screen 194 is used to display images, video, and the like. The display screen 194 includes a display panel. The display panel may adopt a Liquid Crystal Display (LCD), an organic light-emitting diode (OLED), an active-matrix organic light-emitting diode (active-matrix organic light-emitting diode, AMOLED), a flexible light-emitting diode (FLED), a miniature, a Micro-oeld, a quantum dot light-emitting diode (QLED), and the like. In some embodiments, the terminal device 100 may include 1 or N display screens 194, where N is a positive integer greater than 1.

The terminal device 100 may implement a shooting function through the ISP, the camera 193, the video codec, the GPU, the display screen 194, the application processor, and the like.

The ISP is used to process the data fed back by the camera 193. For example, when a photo is taken, the shutter is opened, light is transmitted to the camera photosensitive element through the lens, the optical signal is converted into an electrical signal, and the camera photosensitive element transmits the electrical signal to the ISP for processing and converting into an image visible to naked eyes. The ISP can also carry out algorithm optimization on the noise, brightness and skin color of the image. The ISP can also optimize parameters such as exposure, color temperature and the like of a shooting scene. In some embodiments, the ISP may be provided in camera 193.

The camera 193 is used to capture still images or video. The object generates an optical image through the lens and projects the optical image to the photosensitive element. The photosensitive element may be a Charge Coupled Device (CCD) or a complementary metal-oxide-semiconductor (CMOS) phototransistor. The light sensing element converts the optical signal into an electrical signal, which is then passed to the ISP where it is converted into a digital image signal. And the ISP outputs the digital image signal to the DSP for processing. The DSP converts the digital image signal into image signal in standard RGB, YUV and other formats. In some embodiments, the terminal device 100 may include 1 or N cameras 193, N being a positive integer greater than 1.

The digital signal processor is used for processing digital signals, and can process other digital signals besides digital image signals. For example, when the terminal device 100 selects a frequency point, the digital signal processor is used to perform fourier transform or the like on the frequency point energy.

Video codecs are used to compress or decompress digital video. The terminal device 100 may support one or more video codecs. In this way, the terminal device 100 can play or record video in a plurality of encoding formats, such as: moving Picture Experts Group (MPEG) 1, MPEG2, MPEG3, MPEG4, and the like.

The NPU is a neural-network (NN) computing processor that processes input information quickly by using a biological neural network structure, for example, by using a transfer mode between neurons of a human brain, and can also learn by itself continuously. The NPU can implement applications such as intelligent recognition of the terminal device 100, for example: image recognition, face recognition, speech recognition, text understanding, and the like.

The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the storage capability of the terminal device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. For example, files such as music, video, etc. are saved in an external memory card.

The internal memory 121 may be used to store computer-executable program code, which includes instructions. The processor 110 executes various functional applications of the terminal device 100 and data processing by executing instructions stored in the internal memory 121. The internal memory 121 may include a program storage area and a data storage area. The storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required by at least one function, and the like. The storage data area may store data (such as audio data, a phonebook, etc.) created during use of the terminal device 100, and the like. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory, such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (UFS), and the like.

The terminal device 100 may implement an audio function through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the earphone interface 170D, and the application processor. Such as music playing, recording, etc.

The audio module 170 is used to convert digital audio information into an analog audio signal output and also to convert an analog audio input into a digital audio signal. The audio module 170 may also be used to encode and decode audio signals. In some embodiments, the audio module 170 may be disposed in the processor 110, or some functional modules of the audio module 170 may be disposed in the processor 110.

The speaker 170A, also called a "horn", is used to convert the audio electrical signal into an acoustic signal. The terminal device 100 can listen to music through the speaker 170A, or listen to a handsfree call.

The receiver 170B, also called "earpiece", is used to convert the electrical audio signal into an acoustic signal. When the terminal device 100 answers a call or voice information, it is possible to answer a voice by bringing the receiver 170B close to the human ear.

The microphone 170C, also referred to as a "microphone," is used to convert sound signals into electrical signals. When making a call or transmitting voice information, the user can input a voice signal to the microphone 170C by speaking the user's mouth near the microphone 170C. The terminal device 100 may be provided with at least one microphone 170C. In other embodiments, the terminal device 100 may be provided with two microphones 170C, which may implement a noise reduction function in addition to collecting sound signals. In other embodiments, the terminal device 100 may further include three, four or more microphones 170C to collect sound signals, reduce noise, identify sound sources, and implement directional recording functions.

The headphone interface 170D is used to connect a wired headphone. The headset interface 170D may be the USB interface 130, or may be an Open Mobile Terminal Platform (OMTP) standard interface of 3.5mm, or a cellular telecommunications industry association (cellular telecommunications industry association of the USA, CTIA) standard interface.

The pressure sensor 180A is used for sensing a pressure signal, and converting the pressure signal into an electrical signal. In some embodiments, the pressure sensor 180A may be disposed on the display screen 194. The pressure sensor 180A can be of a wide variety, such as a resistive pressure sensor, an inductive pressure sensor, a capacitive pressure sensor, and the like. The capacitive pressure sensor may be a sensor comprising at least two parallel plates having an electrically conductive material. When a force acts on the pressure sensor 180A, the capacitance between the electrodes changes. The terminal device 100 determines the intensity of the pressure from the change in the capacitance. When a touch operation is applied to the display screen 194, the terminal device 100 detects the intensity of the touch operation based on the pressure sensor 180A. The terminal device 100 may also calculate the touched position from the detection signal of the pressure sensor 180A. In some embodiments, the touch operations that are applied to the same touch position but different touch operation intensities may correspond to different operation instructions. For example: and when the touch operation with the touch operation intensity smaller than the first pressure threshold value acts on the short message application icon, executing an instruction for viewing the short message. And when the touch operation with the touch operation intensity larger than or equal to the first pressure threshold value acts on the short message application icon, executing an instruction of newly building the short message.

The gyro sensor 180B may be used to determine the motion attitude of the terminal device 100. In some embodiments, the angular velocity of terminal device 100 about three axes (i.e., x, y, and z axes) may be determined by gyroscope sensor 180B. The gyro sensor 180B may be used for photographing anti-shake. Illustratively, when the shutter is pressed, the gyro sensor 180B detects the shake angle of the terminal device 100, calculates the distance to be compensated for by the lens module according to the shake angle, and allows the lens to counteract the shake of the terminal device 100 through a reverse movement, thereby achieving anti-shake. The gyroscope sensor 180B may also be used for navigation, somatosensory gaming scenes.

The air pressure sensor 180C is used to measure air pressure. In some embodiments, the terminal device 100 calculates an altitude from the barometric pressure measured by the barometric pressure sensor 180C, and assists in positioning and navigation.

The magnetic sensor 180D includes a hall sensor. The terminal device 100 may detect the opening and closing of the flip holster using the magnetic sensor 180D. In some embodiments, when the terminal device 100 is a folder, the terminal device 100 may detect the opening and closing of the folder according to the magnetic sensor 180D. And then according to the opening and closing state of the leather sheath or the opening and closing state of the flip cover, the automatic unlocking of the flip cover is set.

The acceleration sensor 180E can detect the magnitude of acceleration of the terminal device 100 in various directions (generally, three axes). The magnitude and direction of gravity can be detected when the terminal device 100 is stationary. The method can also be used for recognizing the posture of the terminal equipment, and is applied to horizontal and vertical screen switching, pedometers and other applications.

A distance sensor 180F for measuring a distance. The terminal device 100 may measure the distance by infrared or laser. In some embodiments, shooting a scene, the terminal device 100 may range using the distance sensor 180F to achieve fast focus.

The proximity light sensor 180G may include, for example, a Light Emitting Diode (LED) and a light detector, such as a photodiode. The light emitting diode may be an infrared light emitting diode. The terminal device 100 emits infrared light to the outside through the light emitting diode. The terminal device 100 detects infrared reflected light from a nearby object using a photodiode. When sufficient reflected light is detected, it can be determined that there is an object near the terminal device 100. When insufficient reflected light is detected, the terminal device 100 can determine that there is no object near the terminal device 100. The terminal device 100 can utilize the proximity light sensor 180G to detect that the user holds the terminal device 100 close to the ear for talking, so as to automatically turn off the screen to achieve the purpose of saving power. The proximity light sensor 180G may also be used in a holster mode, a pocket mode automatically unlocks and locks the screen.

The ambient light sensor 180L is used to sense the ambient light level. The terminal device 100 may adaptively adjust the brightness of the display screen 194 according to the perceived ambient light level. The ambient light sensor 180L may also be used to automatically adjust the white balance when taking a picture. The ambient light sensor 180L may also cooperate with the proximity light sensor 180G to detect whether the terminal device 100 is in a pocket, in order to prevent accidental touches.

The fingerprint sensor 180H is used to collect a fingerprint. The terminal device 100 can utilize the collected fingerprint characteristics to realize fingerprint unlocking, access to an application lock, fingerprint photographing, fingerprint incoming call answering and the like.

The temperature sensor 180J is used to detect temperature. In some embodiments, the terminal device 100 executes a temperature processing policy using the temperature detected by the temperature sensor 180J. For example, when the temperature reported by the temperature sensor 180J exceeds the threshold, the terminal device 100 performs a reduction in performance of a processor located near the temperature sensor 180J, so as to reduce power consumption and implement thermal protection. In other embodiments, the terminal device 100 heats the battery 142 when the temperature is below another threshold to avoid the terminal device 100 being abnormally shut down due to low temperature. In other embodiments, when the temperature is lower than a further threshold, the terminal device 100 performs boosting on the output voltage of the battery 142 to avoid abnormal shutdown due to low temperature.

The touch sensor 180K is also referred to as a "touch panel". The touch sensor 180K may be disposed on the display screen 194, and the touch sensor 180K and the display screen 194 form a touch screen, which is also called a "touch screen". The touch sensor 180K is used to detect a touch operation applied thereto or nearby. The touch sensor can communicate the detected touch operation to the application processor to determine the touch event type. Visual output associated with the touch operation may be provided through the display screen 194. In other embodiments, the touch sensor 180K may be disposed on the surface of the terminal device 100, different from the position of the display screen 194.

The bone conduction sensor 180M may acquire a vibration signal. In some embodiments, the bone conduction sensor 180M may acquire a vibration signal of the human vocal part vibrating the bone mass. The bone conduction sensor 180M may also contact the human pulse to receive the blood pressure pulsation signal. In some embodiments, the bone conduction sensor 180M may also be disposed in a headset, integrated into a bone conduction headset. The audio module 170 may analyze a voice signal based on the vibration signal of the bone mass vibrated by the sound part acquired by the bone conduction sensor 180M, so as to implement a voice function. The application processor can analyze heart rate information based on the blood pressure beating signal acquired by the bone conduction sensor 180M, so as to realize the heart rate detection function.

The keys 190 include a power-on key, a volume key, and the like. The keys 190 may be mechanical keys. Or may be touch keys. The terminal device 100 may receive a key input, and generate a key signal input related to user setting and function control of the terminal device 100.

The motor 191 may generate a vibration cue. The motor 191 may be used for incoming call vibration cues, as well as for touch vibration feedback. For example, touch operations applied to different applications (e.g., photographing, audio playing, etc.) may correspond to different vibration feedback effects. The motor 191 may also respond to different vibration feedback effects for touch operations applied to different areas of the display screen 194. Different application scenes (such as time reminding, receiving information, alarm clock, game and the like) can also correspond to different vibration feedback effects. The touch vibration feedback effect may also support customization.

Indicator 192 may be an indicator light that may be used to indicate a state of charge, a change in charge, or a message, missed call, notification, etc.

The SIM card interface 195 is used to connect a SIM card. The SIM card can be brought into and out of contact with the terminal device 100 by being inserted into the SIM card interface 195 or being pulled out of the SIM card interface 195. The terminal device 100 may support 1 or N SIM card interfaces, where N is a positive integer greater than 1. The SIM card interface 195 may support a Nano SIM card, a Micro SIM card, a SIM card, etc. The same SIM card interface 195 can be inserted with multiple cards at the same time. The types of the plurality of cards may be the same or different. The SIM card interface 195 may also be compatible with different types of SIM cards. The SIM card interface 195 may also be compatible with external memory cards. The terminal device 100 interacts with the network through the SIM card to implement functions such as communication and data communication. In some embodiments, the terminal device 100 employs eSIM, namely: an embedded SIM card. The eSIM card may be embedded in the terminal device 100 and cannot be separated from the terminal device 100.

The three-mode broadband terminal antenna in the embodiment of the present application may be disposed near an edge area of the terminal device, such as near a top, a bottom, a side, or a corner of the terminal device, avoiding the battery, where fig. 2 is a schematic diagram of the antenna disposed at the bottom of the terminal device, a region 21 in fig. 2 is a distribution region of the antenna radiation unit, and a region 22 is a distribution region of the dielectric substrate to which the antenna radiation unit is attached. In fig. 3, the radio frequency path 31 is distributed on a Printed Circuit Board (PCB) 32, the PCB32 is mounted on a metal floor 33, the antenna radiation element 34 is attached to a dielectric substrate 35, the antenna radiation element 34 can be connected to a ground point 37 through a spring piece 36, and connected to an equivalent ground through the ground point 37, which can be the metal floor 33 or a metal ground on the PCB 32. The antenna radiating element 34 may also be connected to the feed point of the antenna via the spring 36 and then to the rf path 31 via the feed point. It should be noted that the relative positions of the parts in fig. 3 are illustrative, and not restrictive to the embodiments of the present application.

In the current terminal products, the terminal equipment of the full-face screen generally needs a metal iron frame as large as possible to support the whole structure, so that the antenna clearance is reduced, the antenna efficiency is low, and the frequency band covered by the antenna is narrow. In order to enable a product to support a wider frequency band and ensure the product specification while ensuring the antenna efficiency, for example, to cover communication frequency bands such as LTE B1, B2, B3, B4, B7, B38, B39, B40, and B41 in the range of 1.71GHz to 2.69GHz, reference may be made to the scheme shown in fig. 4 at present, two branches of the antenna radiation unit 34 in fig. 4 are respectively connected to the first tuning switch 41 and the second tuning switch 42, and different paths are switched by the tuning switches 41 and 42 to connect different matching networks, for example, four switching paths may realize 16 switching states, and each switching state may cover one communication frequency band, thereby realizing the compatibility of multiple frequency bands. However, in this way, the cost of the antenna is increased and the reliability is reduced due to the addition of the tuning switch.

In the embodiment of the application, through the branch of adding the antenna radiation unit, under the condition of supporting two original resonance modes, another resonance mode is added, so that the antenna can support three resonance modes, and under the condition of extremely small headroom, the bandwidth of the antenna can be expanded without using a tuning switch, so that the antenna has broadband characteristics, the cost is reduced, and meanwhile, in the antenna scheme, the reliability of the antenna can be improved by using a reduction device.

For convenience of understanding, the following embodiments of the present application will specifically describe a specific structure of an antenna provided in the embodiments of the present application by taking a terminal device having a structure shown in fig. 1 as an example, and combining the drawings and an application scenario.

Fig. 5 is a schematic structural diagram of an example of a three-mode broadband terminal antenna according to an embodiment of the present application. Fig. 5 is a plan view of the dielectric substrate 35, and as shown in fig. 5, the antenna 500 includes: the first radiation branch 501, the second radiation branch 502, the third radiation branch 503, the first matching network 504 and the second matching network 505, and the first radiation branch 501, the second radiation branch 502 and the third radiation branch 503 are all attached to the dielectric substrate 34. The first radiation branch 501 is electrically connected to the second radiation branch 502, and the first matching network 504 is electrically connected to the feeding point 506 and the second radiation branch 502. The second radiating branch 502 may be connected to a metal ground or a metal floor of the PCB through a spring plate, thereby forming a loop of the first frequency band signal or the second frequency band signal. The first radiation branch 501, the second radiation branch 502 and the third radiation branch 503 in fig. 5 are illustrated by metal traces with the same width, and they may be connected together seamlessly, for example, as shown in fig. 5. Alternatively, the first radiation branch 501 and the second radiation branch 502 may be connected by traces of other sizes, such as those shown in fig. 6 and 7. In this embodiment, the connection manner of the first radiation branch 501 and the second radiation branch 502 is not limited. The second matching network 505 is connected to the equivalent ground (metal ground or metal floor 33 on the PCB) and the third radiation branch 503 to form a loop of the third frequency band signal. Third radiating branch 503 is spaced from second radiating branch 502 by a distance.

Alternatively, the dielectric substrate 35 may be a plastic structure such as a bracket and a back cover of a terminal device, and a material having a relative dielectric constant of 3.01 and a loss tangent of 0.01 may be selected.

When the excitation source transmits the first frequency band signal, the first frequency band signal passes through the feeding point 506 and enters the antenna radiation unit 34 via the first matching network 504. The first radiation branch 501 and the second radiation branch 502 may be used as main radiation units, and are excited by a first frequency band signal to form a first resonance mode under the matching action of the first matching network 504, and at this time, the antenna 500 may radiate the first frequency band signal with an antenna efficiency meeting the requirement. Similarly, in a state of receiving a signal, the first radiation branch 501 and the second radiation branch 502 serve as main radiation units, and are excited by the received first frequency band signal to form a first resonance mode under the matching action of the first matching network 504, and at this time, the antenna 500 can receive the first frequency band signal with the antenna efficiency meeting the requirement.

When the excitation source transmits the second frequency band signal, the second frequency band signal passes through the feeding point 506 and enters the antenna radiation unit via the first matching network 504. The second radiating branch 502 may serve as a main radiating element, and is excited by the second frequency band signal to function as a second resonant mode under the matching action of the first matching network 504, and at this time, the antenna 500 may radiate the second frequency band signal with an antenna efficiency meeting the requirement. Similarly, in the state of receiving signals, the second radiating branch 502 serves as a main radiating element, and the second frequency band signals are excited to play a second resonant mode under the matching action of the first matching network 504, so that the antenna 500 can receive the second frequency band signals with the antenna efficiency meeting the requirement.

When the excitation source transmits a third frequency band signal, the third frequency band signal passes through the feeding point 506 and enters the antenna radiating element 34 via the first matching network 504. The third radiation branch 503 is used as a parasitic radiation unit, and the third radiation branch 503 is excited by the third frequency band signal to function as a third resonant mode under the matching action of the second matching network 505, at this time, the antenna 500 can radiate the third frequency band signal with the antenna efficiency meeting the requirement. Similarly, in a state of receiving a signal, the third radiation branch 503 serves as a parasitic radiation unit, and the third radiation branch 503 is excited by the received third frequency band signal to function as a third resonant mode under the matching action of the second matching network 505, at this time, the antenna 500 can receive the third frequency band signal with the antenna efficiency meeting the requirement.

It should be noted that the first frequency band signal, the second frequency band signal, and the third frequency band signal are signals of different frequency bands, and the wavelengths are different, and the first frequency band signal, the second frequency band signal, and the third frequency band signal are not necessarily arranged according to the frequency. Optionally, when the electrical lengths of the first radiation branch 501 and the second radiation branch 502 are equivalent to one-half wavelength of the first frequency band signal, the first resonance mode is a one-half wavelength resonance mode of the first radiation branch 501 and the second radiation branch 502. The second resonant mode is a quarter-wavelength resonant mode of second radiating branch 502 when the electrical length of second radiating branch 502 is equivalent to a quarter-wavelength of the second band signal. When the electrical length of the third radiating branch 503 is equivalent to a quarter wavelength of the third frequency band signal, the third resonant mode is a quarter resonant mode of the third radiating branch 503.

In this embodiment, the first radiation branch is added on the basis of the second radiation branch, so that the antenna can support the first resonance mode of the first frequency band signal while supporting the second resonance mode of the original second frequency band signal and the third resonance mode of the original third frequency band signal. Therefore, under the condition of extremely small headroom, the bandwidth of the antenna is not required to be expanded by using a tuning switch, and different frequency bands are not required to be adapted by using multiple groups of matching networks, so that the cost is reduced under the condition of ensuring that the antenna has broadband characteristics. Meanwhile, as the tuning switch and other matching networks are reduced, the failure rate of hardware is reduced, and the reliability of the antenna is improved. In addition, due to the fact that other matching networks are reduced, debugging work for the matching networks is correspondingly reduced, compared with the traditional situation that the matching networks corresponding to each frequency band are debugged one by one, debugging amount is reduced, debugging time is correspondingly shortened, and therefore research and development efficiency of the antenna is improved.

In one embodiment, the first resonant mode is a half-wavelength resonant mode of first radiating branch 501 and second radiating branch 502, the second resonant mode is a quarter-wavelength resonant mode of second radiating branch 502, and the third resonant mode is a quarter-wavelength resonant mode of third radiating branch 503. Take the first frequency band signal as 2.6GHz or nearby frequency signal, the second frequency band signal as 1.75GHz or nearby frequency signal, the third frequency band signal as 2.2GHz or nearby frequency signal as an example: when a first frequency band signal enters the antenna, the first radiation branch and the second radiation branch are excited to form a half-wavelength resonance mode; when a second frequency band signal enters the antenna, the second radiation branch is excited to form a quarter-wavelength resonance mode; when a third frequency band signal enters the antenna, the third radiating stub is excited into a quarter-wave resonant mode. Therefore, the antenna can ensure the antenna efficiency in a section of frequency range with 2.6GHz, 2.2GHz and 1.75GHz as centers, for example, the antenna performance can cover the communication frequency bands of LTE B1, B2, B3, B4, B7, B38, B39, B40, B41 and the like in the range of 1.71GHz to 2.69GHz, and the requirement of wireless communication can be met.

On the basis of the above embodiment, as shown in fig. 8, a gap 507 may be formed in the second radiation branch 502, the gap 507 is disposed along the length direction of the second radiation branch 502, an open end of the gap 507 is located at an end of the second radiation branch 502 far from the first radiation branch 501, and the length of the gap 507 is smaller than the length of the second radiation branch 502.

Generally, when a terminal device is held by a user, the antenna efficiency is reduced due to the proximity of a human hand or head to the antenna. A schematic view of a user holding the antenna can be seen in fig. 9. In general (i.e. without the slot 507), the performance of the antenna is greatly affected after the electric field intensity point of the antenna branch is held by a hand. In this embodiment, one of the electric field strength points is at the end of the second radiation branch 502 near the excitation source. Along with the increase of frequency, the wavelength is shortened gradually, and the electric field strong point can move towards the grounding point gradually, so the situation that the electric field strong point is held by a hand is easier to occur, and the influence of holding on the antenna performance is larger and larger along with the increase of frequency. However, after the slit 507 is added to the second radiation branch 502, the second radiation branch 502 is always an open end at the end of the side far from the first matching network 504 and close to the third radiation branch 503, the electric field strength point is always at the position of the open end according to the boundary condition of the electromagnetic field, and the variation of the electric field strength point with frequency is small. Therefore, when the gap 507 is increased, the performance of the antenna in the hand-held state is gradually improved as the frequency is increased. In this embodiment, the gap of the opening end at the end of the second radiation branch far from the first radiation branch is formed in the second radiation branch, so that the antenna efficiency in a hand-held state can be improved, and the influence of hand holding on the antenna performance is reduced. Fig. 10 shows the influence of the head and hand of the person in fig. 9 on the antenna performance, the dotted line is the curve of the antenna efficiency when the second radiation branch is provided with the slot, the solid line is the curve of the antenna efficiency when the second radiation branch is not provided with the slot, and it can be seen from fig. 10 that in the range from 2GHz to 3GHz, the provision of the slot on the second radiation branch has an obvious improvement over the antenna efficiency when the slot is not provided, and particularly at 2.6GHz, the antenna efficiency can be improved by more than 1.5 dB.

On the basis of the above embodiments, the first radiation branch 501 can also be seen from fig. 11 and has an L-shaped structure. The first radiation branch of the L-shaped structure can be more flexibly wired at the corner position while the electrical lengths of the first radiation branch and the second radiation branch are ensured, and the arrangement of the antenna in the whole machine is more facilitated. Alternatively, the corners of the L-shaped structure may be in the form of chamfered corners, such as shown in fig. 12. Alternatively, the corners of the L-shaped structure may be rounded, as shown in fig. 13.

Based on the above-mentioned embodiments shown in fig. 11, 12, or 13, the grounding point of the second radiating branch 502 is disposed at one end of the second radiating branch 502 close to the first radiating branch 501, and as can be seen from the grounding point position of the second radiating branch 502 in fig. 13, the grounding point of the second radiating branch 502 is disposed close to the first radiating branch 501. Under the condition that the first radiating branch is of an L-shaped structure, the grounding point of the second radiating branch is arranged at one end, close to the first radiating branch, of the second radiating branch, so that the grounding point of the second radiating branch can be close to the corner of the terminal equipment as far as possible, and the transverse mode and the longitudinal mode of the metal floor are excited, and the antenna efficiency is improved.

Based on the above embodiments, the connection point of the first matching network 504 and the second radiation branch 502 may be disposed at an end of the second radiation branch 502 close to the third radiation branch 503, for example, at a distance of 2 mm or 3 mm from an end of the second radiation branch 502 close to the third radiation branch 503. Because the one end of second radiation branch far away from the third radiation branch often arranges more other devices, consequently with the tie point of first matching network and second radiation branch, set up the one end that is close to the third radiation branch in the second radiation branch, can keep away from other devices, avoid being disturbed, ensure antenna performance.

In addition to the above embodiments, the connection point between the second matching network 505 and the third radiation branch 503 is disposed at one end of the third radiation branch 503 far from the second radiation branch 502. For the third radiation branch 503, the open end is the end close to the second radiation branch 502, and the connection point between the second matching network 505 and the third radiation branch 503 is arranged at the end far from the second radiation branch, so that the grounding point of the third radiation branch is far from the open end, and the third resonant mode of the third radiation branch 503 can be excited more easily by the proximity of the open ends of the second radiation branch 502 and the third radiation branch 503.

In addition to the above embodiments, the widths d of the first radiation branch 501, the second radiation branch 502 and the third radiation branch 503₀3 mm, length d of first radiating branch 501₁Is 11 mm, and the length d of the second radiating branch 502₂20 mm, length d of third radiating branch 503₃12 mm, width d of gap 507₄Is 0.5 mm, and the length d of the gap 507₅Is 8 mm, the distance d of the first long side of the slot 507 from the first long side of the second radiating branch 502₆Is 2 mm, the first long side of the gap 507And the first long side of second radiating branch 502 is the side away from first matching network 504. See, for example, fig. 14.

Next, the performance of the antenna according to the embodiment of the present application will be described in a quantitative manner by taking the antenna shown in fig. 14 as an example. Fig. 15 is a graph of the reflection coefficient S11 of the antenna shown in fig. 14, and it can be seen from fig. 15 that S11 is smaller than-6 dB near 1.8GHz, S11 is smaller than-16 dB near 2.2GHz, and S11 reaches-14 dB near 2.6GHz, which shows that the antenna in the present embodiment has less energy loss and the antenna performance is ensured. Fig. 16 is a graph showing the antenna efficiency (i.e., the antenna system efficiency) of the antenna shown in fig. 14, and it can be seen from fig. 16 that the antenna efficiency can reach-3 dB or more in the range of 1.71GHz to 2.69GHz, and can simultaneously cover the communication bands such as LTE B1, B2, B3, B4, B7, B38, B39, B40, and B41.

When the first frequency band signal is a 2.6GHz signal, the first radiation branch 501 and the second radiation branch 502 are excited to have a half-wavelength resonant mode, and the distribution of the current in the antenna can be mainly concentrated on the first radiation branch 501 and the second radiation branch 502 as shown in fig. 17; when the second frequency band signal is 1.8GHz, the second radiation branch 502 is excited to have a quarter-wavelength resonant mode, and the distribution of the current in the antenna can be seen from fig. 18, and is mainly concentrated on the second radiation branch 502; when the third frequency band signal is a 2.2GHz signal, the third radiation branch 503 is excited to have a third resonant mode, and the distribution of the current in the antenna can be seen from fig. 19, and is mainly concentrated on the third radiation branch 503.

The antenna efficiency of the three-mode broadband terminal antenna shown in fig. 14 is compared with that of the prior art, as shown in fig. 20 and 21. In fig. 20 and 21, a solid line is a curve of the antenna efficiency shown in fig. 14, two dotted lines in fig. 20 are curves of the antenna efficiency of two frequency bands tuned by the antenna structure shown in the common scheme fig. 4 using the single tuning switch 42, and two dotted lines in fig. 21 are curves of the antenna efficiency of two frequency bands tuned by the antenna structure shown in the common scheme fig. 4 using the double tuning switches 41 and 42, and as can be seen from fig. 20 and 21, the antenna efficiency shown in fig. 14 and the flatness of the antenna efficiency are within an effective bandwidth (1.71GHz to 2.69GHz), which is more advantageous.

The embodiment of the present application further provides a terminal device, which includes the antenna in any of the above embodiments, and in the terminal device, the specific form and the beneficial effect of the antenna may refer to the relevant description in the antenna embodiment, which is not described herein again.

Alternatively, the antenna may be disposed along one short side or corner of the terminal device, for example, the antenna is disposed along the short side of the bottom of the terminal device shown in fig. 2, and the antenna structure may be in the form shown in fig. 5-8; as another example, the antenna may be disposed along a lower left corner of the terminal device shown in fig. 2, and the antenna may be configured as shown in fig. 11-13. Generally, the battery on the long side occupies a large space, so that it is difficult to ensure that the antenna occupies a sufficient space, the antenna can be arranged along a short side or a corner of the terminal device, the antenna space is sufficient, the antenna clearance can be ensured as much as possible, and the antenna performance is ensured.

Examples of the antennas provided by the present application are described in detail above. It is to be understood that the corresponding terminal device includes hardware structures corresponding to the respective functions for implementing the functions.

In the several embodiments provided in the present application, it should be understood that the disclosed structure may be implemented in other ways. For example, the above-described structural embodiments are merely illustrative, and for example, a module or a unit may be divided into only one logic function, and may have another division manner in actual implementation, for example, a plurality of units or components may be combined or integrated into another device, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

Units described as separate parts may or may not be physically separate, and parts displayed as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed to a plurality of different places. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A three-mode broadband terminal antenna, comprising: the first radiation branch, the second radiation branch, the third radiation branch, the first matching network and the second matching network;

the first radiating branch is electrically connected with the second radiating branch;

the first matching network is electrically connected with the feeding point and the second radiation branch;

the second matching network is equivalently connected with the third radiation branch section;

the first radiation branch and the second radiation branch are used for being excited by a first frequency band signal to form a first resonance mode under the action of the first matching network;

the second radiation branch is used for being excited by a second frequency band signal to form a second resonance mode under the action of the first matching network;

and the third radiation branch node is used for being excited by a third frequency band signal to play a third resonance mode under the action of the second matching network.

2. The antenna according to claim 1, wherein the second radiating stub is provided with a gap, the gap is arranged along a length direction of the second radiating stub, an open end of the gap is located at an end of the second radiating stub, the end being far away from the first radiating stub, and the length of the gap is smaller than that of the second radiating stub.

3. An antenna according to claim 1 or 2, wherein the first radiating branch is an L-shaped structure.

4. The antenna of claim 3, wherein the corners of the L-shaped structure are rounded.

5. An antenna according to claim 3 or 4, wherein the grounding point of the second radiating stub is provided at an end of the second radiating stub adjacent the first radiating stub.

6. The antenna of any one of claims 1 to 5, wherein the first radiating stub and the second radiating stub are seamlessly connected.

7. The antenna of any one of claims 1 to 6, wherein a connection point of the first matching network and the second radiating branch is disposed at an end of the second radiating branch adjacent to the third radiating branch.

8. An antenna according to any of claims 1 to 7, wherein the connection point of the second matching network and the third radiating stub is provided at the end of the third radiating stub remote from the second radiating stub.

9. An antenna according to any of claims 1 to 8, wherein the first resonant mode is a half wavelength resonant mode of the first and second radiating branches, the second resonant mode is a quarter wavelength resonant mode of the second radiating branch, and the third resonant mode is a quarter wavelength resonant mode of the third radiating branch.

10. A terminal device, characterized in that it comprises a triple-mode broadband terminal antenna according to any one of claims 1 to 9.

11. A terminal device according to claim 10, characterized in that the antenna is arranged along one short side or corner of the terminal device.