Antenna module and intelligent terminal

Abstract

The utility model provides an antenna module and an intelligent terminal. The antenna module comprises a common radiation branch, a tuning circuit, a first feed source, a compensation circuit and a second feed source, the first feed source is connected with the common radiation branch through the tuning circuit; the second feed source is connected with the common radiation branch; and the compensation circuit is connected to a connecting line between the second feed source and the common radiation branch and is used for compensating high-order mode interference on one side of the common radiation branch. According to the technical scheme, the additional compensation circuit can be arranged in the antenna module, and the influence of the compensation circuit on the high-order mode is compensated, so that the influence of the high-order mode close to the lambda ring mode is reduced, and the radiation efficiency of the second antenna is effectively improved.

Description

Technical Field

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

[0002] During the antenna design process of the smart terminal, the first antenna and the second antenna with a large frequency difference can share the same radiation branch, thereby multiplexing the radiation branch and reducing the overall size of the antenna layout.

[0003] Considering that when the overall length of the antenna radiating branch is close to the λ / 4 wavelength length, the RF signal interference of the first antenna (short antenna) is small and the overall size of the antenna radiating branch is small. However, when the length of the common radiating branch reaches λ / 4 of the first antenna, the first radiating antenna will generate high-order modes at the common radiating branch. In the environment of high-order mode interference, the bandwidth and efficiency of the RF signal output by the second antenna may be difficult to optimize, and the efficiency drops sharply near the λ ring mode, which cannot meet the normal antenna performance.

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

[0005] In response to the above technical problems, the present application provides an antenna module and a smart terminal. By setting an additional compensation circuit in the antenna module, the compensation circuit is used to compensate for the influence of high-order modes, thereby reducing the influence of high-order modes close to the λ ring mode, and effectively improving the radiation efficiency of the second antenna.

[0006] The present application provides an antenna module, which is applied to a smart terminal, and includes a common radiation branch, a tuning circuit, a first feed source, a compensation circuit, and a second feed source;

[0007] The first feed source is connected to the common radiation branch through the tuning circuit;

[0008] The second feed source is connected to the common radiation branch;

[0009] The compensation circuit is connected to the connection line between the second feed source and the common radiation branch, and is used to compensate for the high-order mode interference on one side of the common radiation branch.

[0010] Optionally, the compensation circuit includes a first capacitor and a compensation radiation branch;

[0011] The first end of the first capacitor is connected to the connection line between the second feed source and the common radiation branch, and the second end of the first capacitor is connected to the first end of the compensation radiation branch;

[0012] The second end of the compensation radiation branch is grounded.

[0013] Optionally, the ground direction of the compensation radiation branch is the same as the ground direction of the common radiation branch.

[0014] Optionally, at least one of the following is included:

[0015] The compensation radiation branch is a flexible connection line radiation branch arranged on the antenna bracket;

[0016] The compensation radiation branch is a printed radiation branch arranged on the antenna bracket;

[0017] The compensation radiation branch is a routing radiation branch arranged on the smart terminal;

[0018] The compensation radiation branch is a metal frame radiation branch of the smart terminal.

[0019] Optionally, the tuning circuit includes a second capacitor;

[0020] A first end of the second capacitor is connected to the first feed source, and a second end of the second capacitor is connected to the common radiation branch.

[0021] Optionally, the antenna module further includes a first filtering circuit;

[0022] The input end of the first filter circuit is connected to the tuning circuit, and the second end of the first filter circuit is connected to the common radiation branch; and / or,

[0023] The antenna module also includes a second filtering circuit;

[0024] An input end of the second filtering circuit is connected to the compensation circuit and the second feed source, and a second end of the second filtering circuit is connected to the common radiation branch.

[0025] Optionally, both the first filter circuit and the second filter circuit are band-stop filter circuits;

[0026] The band stop frequency of the first filter circuit is the frequency of the radio frequency signal output by the second feed source; the band stop frequency of the second filter circuit is the frequency of the radio frequency signal output by the first feed source.

[0027] Optionally, the first filtering circuit includes a third capacitor and a first inductor;

[0028] A first end of the third capacitor is connected to a first end of the first inductor and the tuning circuit, and a second end of the third capacitor is connected to a second end of the first inductor and the common radiation branch.

[0029] Optionally, the second filtering circuit includes a fourth capacitor and a second inductor;

[0030] A first end of the fourth capacitor is connected to a first end of the second inductor, the compensation circuit and the second feed source, and a second end of the fourth capacitor is connected to a second end of the second inductor and the common radiation branch.

[0031] The present application also provides a smart terminal, comprising: the antenna module described in any one of the above items.

[0032] As described above, the antenna module of the present application can be applied to a smart terminal, including a common radiating branch, a tuning circuit, a first feed source, a compensation circuit, and a second feed source; the first feed source is connected to the common radiating branch through the tuning circuit; the second feed source is connected to the common radiating branch; the compensation circuit is connected to the connecting line between the second feed source and the common radiating branch, and is used to compensate for the high-order mode interference on one side of the common radiating branch. Through the above technical solution, an additional compensation circuit can be set in the antenna module, and the compensation circuit can be used to compensate for the influence of the high-order mode, thereby reducing the influence of the high-order mode near the λ ring mode, and effectively improving the radiation efficiency of the second antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application. In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor.

[0034] Figure 1 A schematic diagram of the hardware structure of a smart terminal for implementing each embodiment of the present application;

[0035] Figure 2 is a schematic structural diagram of an antenna module according to the first embodiment;

[0036] Figure 3 is a circuit diagram of an antenna module according to a second embodiment;

[0037] Figure 4 The S parameter simulation diagram of the second antenna with and without adding a loop radiator;

[0038] Figure 5 is the efficiency diagram of the second antenna without adding a loop radiator and with adding a loop radiator;

[0039] Figure 6 is a curve diagram of the isolation between the first antenna and the second antenna;

[0040] Figure 7A circuit diagram of an antenna module in the prior art;

[0041] Figure 8 is a schematic structural diagram of an antenna module according to a third embodiment;

[0042] Fig. 9 is a circuit diagram of an antenna module according to a third embodiment.

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

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

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

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

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

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

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

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

[0051] The smart terminal 100 may be implemented in various forms. For example, the smart terminal 100 described in the present application may include smart terminals such as mobile phones, tablet computers, laptop computers, PDAs, portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc.

[0052] Taking a mobile terminal as an example for explanation, those skilled in the art will appreciate that, in addition to components specifically used for mobile purposes, the configuration according to the embodiments of the present application can also be applied to a fixed type terminal.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0068] Based on the above-mentioned mobile terminal hardware structure, various embodiments of the present application are proposed.

[0069] First embodiment

[0070] Reference Figure 2 , Figure 2 is a schematic diagram of the structure of the antenna module according to the first embodiment. The antenna module of the embodiment of the present application can be applied to a smart terminal 100 (such as a mobile phone), including a common radiation branch 20, a tuning circuit 30, a first feed source 40, a compensation circuit 50 and a second feed source 60;

[0071] The first feed source 40 is connected to the common radiation branch 20 through the tuning circuit 30;

[0072] The second feed source 60 is connected to the common radiation branch 20;

[0073] The compensation circuit 50 is connected to the connection line between the second feed source 60 and the common radiation branch 20 , and is used to compensate for the high-order mode interference on one side of the common radiation branch 20 .

[0074] Optionally, as the functions of the smart terminal 100 become more and more powerful, the number of antennas that need to be set on the smart terminal 100 also increases, and each antenna needs to be provided with a radiation branch for signal transmission. In the case of a large number of antennas, there is not enough space in the smart terminal 100 for setting up the antennas. Therefore, for some antennas with large frequency differences, the radiation branch requirements in the smart terminal 100 can be reduced by sharing the radiation branch.

[0075] Optionally, when different antennas have a common radiation branch 20, the frequency difference of the signals output by the two antennas is relatively large. However, during the operation of one of the antennas, the power state of the other antenna may be seriously affected. For example, the first antenna is a relatively low-frequency antenna with an operating frequency between 700MHz and 960MHz, and the second antenna is a relatively high-frequency antenna with an operating frequency between 3300MHz and 4200MHz. In actual use, considering that the overall length of the antenna radiation branch of the antenna with a lower frequency is close to the λ / 4 wavelength length, the RF signal interference is small and the overall size of the antenna radiation branch is small, the transmission effect of the RF signal is better. However, when the overall length of the antenna radiation branch of the first antenna is close to the λ / 4 wavelength length, the frequency of the RF signal output by the first antenna is within the operating frequency range of the second antenna, and high-order mode interference will be formed on the common radiation branch 20. Due to the low performance of the high-order mode of the ring mode, the modal efficiency of the second antenna is affected by the entire high-order mode. The bandwidth and efficiency of the RF signal output by the second antenna may be difficult to optimize. The efficiency drops sharply near the λ ring mode, and normal antenna performance cannot be met.

[0076] Optionally, in order to solve the above problem, in the present embodiment, an antenna module is provided. The common radiation branch 20 is a radiation branch used by two antennas in common, and both the first antenna and the second antenna can use the common radiation branch 20 to transmit radio frequency signals. The tuning circuit 30 is a circuit for adjusting the effective electrical length (overall length) of the radiation branch of the first antenna. When the effective electrical length of the common radiation branch 20 cannot reach the λ / 4 wavelength length of the first antenna, the tuning circuit 30 can further load the effective electrical length of the common radiation branch 20 in the first antenna, so that the effective electrical length of the radiation branch of the first antenna reaches the λ / 4 wavelength length of the first antenna. The tuning circuit 30 can be generated by an inductive device, a capacitive device and a combination structure thereof. The tuning circuit 30 is connected to the common radiation branch 20, and by setting the specific parameters of the tuning circuit 30, the effective electrical length of the radiation branch of the first antenna can be effectively adjusted to the λ / 4 wavelength length of the first antenna.

[0077] Optionally, the feed source is an important device that determines the electrical characteristics and frequency band of the antenna. Its function is to radiate the RF power from the feed line to the reflective surface or lens in the form of electromagnetic waves, so that it produces a suitable field distribution on the aperture to form the required sharp wave beam or shaped beam; at the same time, the power leaking out from the edge of the reflective surface or lens is minimized to achieve the highest possible gain. The first feed source 40 is the feed source of the first antenna with a lower frequency, and the second feed source 60 is the feed source of the second antenna with a higher frequency. The compensation circuit 50 is a circuit for compensating for the high-order mode interference generated by the first antenna at the common radiation branch 20. The compensation circuit 50 can generate a compensation signal that is opposite to the signal of the high-order mode interference. The compensation circuit 50 can be generated by an inductive device, a capacitive device and a combination structure thereof.

[0078] Optionally, when the second feed source 60 outputs an RF signal, the compensation circuit 50 can superimpose the compensation signal on the RF signal, and then superimpose the signal of high-order mode interference at the position of the common radiation branch 20. At this time, the compensation signal is complementary to the signal of high-order mode interference, so that the second antenna can output a standard RF signal at the common radiation branch 20, avoiding the low performance of the ring mode high-order mode, which causes the modal efficiency of the second antenna to be affected by the entire high-order mode. Under the action of the compensation circuit 50, the bandwidth and efficiency of the RF signal output by the second antenna can be effectively optimized, and the efficiency near the λ ring mode is maintained stable, which can meet normal antenna performance.

[0079] Embodiment 2

[0080] Based on the above-mentioned first embodiment, a second embodiment of the antenna module of the present application is proposed.

[0081] Optionally, in the second embodiment, the compensation circuit 50 includes a first capacitor C1 and a compensation radiation branch 501;

[0082] The first end of the first capacitor C1 is connected to the connection line between the second feed source 60 and the common radiation branch 20, and the second end of the first capacitor C1 is connected to the first end of the compensation radiation branch 20;

[0083] The second end of the compensation radiation branch 501 is grounded.

[0084] Optionally, the compensating radiation branch 501 is an inductive radiation branch. Considering that the inductor has the function of isolating the current, and the current is a parameter for forming the ring mode, when the current is isolated, the compensation effect on the high-order mode interference is relatively poor. Therefore, in this embodiment, the compensating radiation branch 501 can be selected. The compensating radiation branch 501 does not isolate the current, thereby further enhancing the complementary effect on the high-order mode interference.

[0085] Optionally, the compensating radiation branch 501 can form a new λ / 4 ring mode with the first capacitor C1. Similarly, taking the first antenna as a lower frequency antenna with an operating frequency between 700MHz and 960MHz, and the second antenna as a higher frequency antenna with an operating frequency between 3300MHz and 4200MHz as an example, the frequency of the high-order mode interference on one side of the common radiation branch 20 is about 3.5GHz; the first capacitor C1 and the compensating radiation branch 501 are arranged in series, which can also form a ring mode with a frequency of about 3.5GHz. At this time, the RF signal formed by the second feed source 60 is first superimposed on the 3.5GHz ring mode formed by the first capacitor C1 and the compensating radiation branch 501 arranged in series, and then the opposite 3.5GHz high-order mode is superimposed again at the common radiation branch 20, and the high-order mode and the ring mode cancel each other out, thereby outputting a standard RF signal on one side of the common radiation branch 20. Figure 4 The figure shows the S parameter simulation diagram of the second antenna without and with the loop radiator. The horizontal axis is the frequency in GHz, and the vertical axis is the S parameter value in dB. S parameters are a set of parameters used to describe antenna performance, including reflection coefficient, standing wave ratio, gain, directivity, etc. Figure 5 The figure shows the efficiency of the second antenna without and with the loop radiator added, where the horizontal axis is the frequency in GHz and the vertical axis is the efficiency parameter value in dB. Figure 6 The figure shows the isolation curve between the first antenna and the second antenna, wherein the horizontal axis is the frequency in GHz, and the vertical axis is the S parameter value in dB.

[0086] Optionally, when the compensation radiation branch 501 and the first capacitor C1 are provided, by selecting the first capacitor C1 with a suitable capacitance and the compensation radiation branch 501 with a suitable electrical length, the high-order mode interference on one side of the common radiation branch 20 can be effectively compensated. The capacitance of the first capacitor C1 and the electrical length of the compensation radiation branch 501 can be set according to the specific structure.

[0087] Optionally, the compensation radiation branch 501 also has the function of radiating the output signal of the second feed source 60. If the compensation radiation branch 501 is set outside the smart terminal 100, the specific size of the compensation radiation branch 501 can be adjusted so that it and the first capacitor C1 can meet the radiation requirements of the RF signal output by the second feed source 60. In this case, the RF signal output by the second feed source 60 can be directly radiated through the first capacitor C1 and the compensation radiation branch 501.

[0088] Optionally, considering that in most cases, the compensation radiation branch 501 is set inside the smart terminal 100, and the compensation radiation branch 501 is used alone to radiate the RF signal output by the second feed source 60, the efficiency bandwidth of the compensation radiation branch 501 is not high due to the lack of clearance, and the broadband radiation of the second antenna cannot be achieved by using the compensation radiation branch 501 alone. Therefore, in this embodiment, it is necessary to use the common radiation branch 20 and the compensation radiation branch 501 to work together, so as to ensure the radiation bandwidth and radiation efficiency of the RF signal output by the second feed source 60 while compensating for the high-order mode interference.

[0089] Optionally, during the setting of the compensation radiation branch 501, it is considered that the ring mold for compensation and the ring mold on one side of the common radiation branch 20 can be formed by a current ring. The specific flow direction of the current in the radiation branch is closely related to the formation of the ring mold. Therefore, in this embodiment, the current in the compensation radiation branch 501 and the current in the common radiation branch 20 need to intersect in the same direction. For example, the direction of the current in the common radiation branch 20 is vertically downward from the ground. At this time, the direction of the current in the compensation radiation branch 501 needs to have an effective component in the vertically downward direction. Therefore, during the setting of the compensation radiation branch 501, the ground direction of the compensation radiation branch 501 needs to be set according to the ground direction of the common radiation branch 20 to ensure that a ring mold for compensation can be generated.

[0090] Optionally, the grounding direction of the compensation radiation branch 501 is the same as the grounding direction of the common radiation branch 20. Considering that the grounding direction of the compensation radiation branch 501 is the same as the grounding direction of the common radiation branch 20, the current flow direction in the compensation radiation branch 501 is exactly the same as the current flow direction of the common radiation branch 20. When the specific parameters of the first capacitor C1 and the compensation radiation branch 501 are determined, the grounding direction of the compensation radiation branch 501 is the same as the grounding direction of the common radiation branch 20, and the loop current formed on the output side of the second feed source 60 can be closest to the high-order mode interference. Therefore, in order to further improve the effect of the second antenna outputting the RF signal, the grounding direction of the compensation radiation branch 501 can be set to the grounding direction of the common radiation branch 20.

[0091] Optionally, in the specific setting process of the compensation radiation branch 501, the compensation radiation branch 501 only needs to have a radiation function. In this embodiment, since the first antenna and the second antenna are both arranged in the smart terminal 100, and the smart terminal 100 is also provided with an antenna bracket for carrying the antenna, the compensation radiation branch 501 can be directly arranged on the antenna bracket.

[0092] Optionally, when the compensation radiation branch 501 is provided on the antenna bracket, the compensation radiation branch 501 may be a flexible connection wire radiation branch or a printed radiation branch. Since the flexible connection wire includes metal that can be used for radiation, the radiation of radio frequency signals can also be achieved through the flexible connection wire. The compensation radiation branch 501 formed by the flexible connection wire is fixedly provided on the antenna bracket, and then connected to the first capacitor C1. The printed radiation branch is a metal material that can be used for radiation, and is provided on the antenna bracket by printing. In the specific setting process, during the manufacturing process of the antenna bracket, the metal material can be directly printed on the antenna bracket to form a printed radiation branch, and then the printed radiation branch on the antenna bracket can be connected to the first capacitor C1.

[0093] Optionally, in the specific setting process of the compensation radiation branch 501, the compensation radiation branch 501 can also be directly set on the main board of the intelligent terminal 100, and the metal wiring on the main board is used to form the radiation branch. To set the radiation branch on the metal main board, a metal wiring of a certain electrical length can be laid out on the metal main board, and then the part of the metal wiring can be connected to the first capacitor C1. Of course, when there is an idle metal wiring whose effective electrical length meets the requirements on the main board of the intelligent terminal 100, the idle metal wiring can also be directly used to make the compensation radiation branch 501, and then the compensation radiation branch 501 is connected to the first capacitor C1.

[0094] Optionally, considering that the external frame of the smart terminal 100 may be made of metal material or non-metal material. In the case where the external frame of the smart terminal 100 is made of metal material, the external frame of the smart terminal 100 also has the ability to radiate signals, and the metal frame can also be used to make the compensation radiation branch 501. In the specific manufacturing process, it is necessary to select a metal frame whose effective electrical length meets the requirements of the compensation radiation branch 501, and then connect the metal frame radiation branch to the first capacitor C1 and ground it.

[0095] Optionally, the compensation radiation branch 501 may also be made of metal materials with other structures, which is not specifically limited here.

[0096] Embodiment 3

[0097] The third embodiment of the present application is proposed based on the first embodiment or the second embodiment.

[0098] Optionally, the capacitive device and the inductive device have a certain tuning capability, and the effective electrical length of the common radiation branch 20 can be adjusted by tuning using the capacitive device or the inductive device. For example, a tuning circuit is formed by connecting a capacitor, an inductor, or a combination of an inductor and a capacitor in series between the common radiation branch 20 and the first feed source 40.

[0099] Optionally, refer to Figure 7 , in this embodiment, the tuning circuit 30 includes a second capacitor C2;

[0100] A first end of the second capacitor C2 is connected to the first feed source 40 , and a second end of the second capacitor C2 is connected to the common radiation branch 20 .

[0101] Optionally, in Figure 7 The second capacitor C2 is used as a tuning circuit. The capacitance characteristics of the second capacitor C2 can be used to extend the effective electrical length of the common radiation branch 20, so that the effective electrical length of the first feed source 40 connecting the radiation branch reaches the λ / 4 wavelength length of the first antenna, thereby improving the anti-interference ability of the first antenna output radio frequency signal at the λ / 4 wavelength.

[0102] Optionally, in the case of providing an inductor device or a combination of an inductor and a capacitor, one end of the inductor or the combination of an inductor and a capacitor may be connected to the first feed source 40 and the other end may be connected to the common radiation branch 20, thereby achieving a tuning function.

[0103] Optionally, considering that two antennas share a common radiation branch 20, there may be interference between the RF signals output by the two antennas, resulting in reduced radiation effects of both antennas. To avoid interference between the two antennas, in this embodiment, the antenna module is further provided with at least one filter circuit.

[0104] Optionally, refer to Figure 8 , the antenna module also includes a first filtering circuit 70;

[0105] An input end of the first filter circuit 70 is connected to the tuning circuit 30 , and a second end of the first filter circuit 70 is connected to the common radiation branch 20 .

[0106] Optionally, the first filter circuit 70 is used to filter out the radio frequency signal generated by the second feed source 60. The first filter circuit 70 may be a filter, a band-stop filter circuit, etc. The first filter circuit 70 may filter out the radio frequency signal of the second feed source 60.

[0107] Optionally, during the RF signal output process, the first filter circuit 70 can perform impedance matching on the output RF signal, improve the output power of the RF signal, and further improve the radiation effect of the RF signal. During the RF signal reception process, the first filter circuit 70 can also filter out the RF signal corresponding to the second antenna when the shared radiation branch 20 receives the RF signal corresponding to the second antenna, thereby preventing the RF signal of the second antenna from interfering with the RF signal that it needs to receive. Similarly, take the above-mentioned first antenna as a lower frequency antenna with an operating frequency between 700MHz and 960MHz, and the second antenna as a higher frequency antenna with an operating frequency between 3300MHz and 4200MHz as an example. When the shared radiation branch 20 receives a RF signal in the range of 3300MHz to 4200MHz, the first filter circuit 70 can filter out the RF signal.

[0108] Optionally, refer to Figure 8 , the antenna module also includes a second filtering circuit 80;

[0109] An input end of the second filtering circuit 80 is connected to the compensation circuit 50 and the second feed source 60 , and a second end of the second filtering circuit 80 is connected to the common radiation branch 20 .

[0110] Optionally, the second filter circuit 80 is used to filter out the radio frequency signal generated by the first feed source 40. The second filter circuit 80 can also be a filter, a band-stop filter circuit, etc. The second filter circuit 80 can filter out the radio frequency signal of the first feed source 40.

[0111] Optionally, during the RF signal output process, the second filter circuit 80 can perform impedance matching on the RF signal output by the second feed source 60, improve the output power of the RF signal, and further improve the radiation effect of the RF signal. During the RF signal reception process, the second filter circuit 80 can also filter out the RF signal corresponding to the first antenna when the shared radiation branch 20 receives the RF signal corresponding to the first antenna, thereby avoiding the RF signal of the first antenna from interfering with the RF signal that it needs to receive. Similarly, take the above-mentioned first antenna as an antenna with a lower frequency between 700MHz and 960MHz, and the second antenna as an antenna with a higher frequency between 3300MHz and 4200MHz as an example. When the shared radiation branch 20 receives a RF signal in the range of 700MHz to 960MHz, the first filter circuit 70 can filter out the RF signal.

[0112] Optionally, both the first filter circuit 70 and the second filter circuit 80 are band-stop filter circuits;

[0113] The band stop frequency of the first filter circuit 70 is the frequency of the RF signal output by the second feed source, thereby filtering out the RF signal of the first feed source 40; the band stop frequency of the second filter circuit 80 is the frequency of the RF signal output by the first feed source, thereby filtering out the RF signal of the second feed source 60.

[0114] Optionally, in this embodiment, a first filter circuit 70 and a second filter circuit 80 may be separately provided. Of course, the first filter circuit 70 and the second filter circuit 80 may also be provided at the same time.

[0115] Optionally, refer to Fig. 9 , the first filter circuit 70 includes a third capacitor C3 and a first inductor L1;

[0116] A first end of the third capacitor C3 is connected to a first end of the first inductor L1 and the tuning circuit 30 , and a second end of the third capacitor C3 is connected to a second end of the first inductor L1 and the common radiation branch 20 .

[0117] Optionally, in this embodiment, the first filter circuit 70 is an LC filter circuit composed of an inductor and a capacitor. The LC filter circuit filters the radio frequency signal output by the second feed source 60 by utilizing the filtering characteristics of the capacitor and the inductor.

[0118] Optionally, when the common radiation branch 20 receives a radio frequency signal, the first filter circuit 70 may filter out the radio frequency signal of the frequency band corresponding to the second feed source 60 , thereby receiving the radio frequency signal corresponding to the first feed source 40 without interference.

[0119] Optionally, refer to Fig. 9 , the second filtering circuit includes a fourth capacitor C4 and a second inductor L2;

[0120] A first end of the fourth capacitor C4 is connected to a first end of the second inductor L2 , the compensation circuit 50 and the second feed source 60 , and a second end of the fourth capacitor C4 is connected to a second end of the second inductor L2 and the common radiation branch 20 .

[0121] Optionally, in this embodiment, the second filter circuit 80 is an LC filter circuit composed of an inductor and a capacitor. The LC filter circuit filters the radio frequency signal output by the first feed source 40 by utilizing the filtering characteristics of the capacitor and the inductor.

[0122] Optionally, when the common radiation branch 20 receives a radio frequency signal, the second filter circuit 80 may filter out the radio frequency signal of the frequency band corresponding to the first feed source 40 , thereby receiving the radio frequency signal corresponding to the second feed source 60 without interference.

[0123] The present application also provides a smart terminal, including the antenna module described in any of the above embodiments. The specific components included in the antenna module and the connection relationship between the components can refer to the above first to third embodiments, which will not be described here.

[0124] It is understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of the present application. The technical solutions of the present application can also be applied to other scenarios. For example, it is known to those skilled in the art that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0125] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0126] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0127] The units in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0128] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0129] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0130] The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0131] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. An antenna module, applied to a smart terminal, characterized in that: It includes a common radiation branch, a tuning circuit, a first feed source, a compensation circuit and a second feed source; The first feed source is connected to the common radiation branch through the tuning circuit; The second feed source is connected to the common radiation branch; The compensation circuit is connected to the connection line between the second feed source and the common radiation branch, and is used to compensate for the high-order mode interference on one side of the common radiation branch.

2. The antenna module according to claim 1, characterized in that: The compensation circuit includes a first capacitor and a compensation radiation branch; The first end of the first capacitor is connected to the connection line between the second feed source and the common radiation branch, and the second end of the first capacitor is connected to the first end of the compensation radiation branch; The second end of the compensation radiation branch is grounded.

3. The antenna module according to claim 2, characterized in that: The downward direction of the compensation radiation branch is the same as the downward direction of the common radiation branch.

4. The antenna module according to claim 2, characterized in that: Include at least one of the following: The compensation radiation branch is a flexible connection line radiation branch arranged on the antenna bracket; The compensation radiation branch is a printed radiation branch arranged on the antenna bracket; The compensation radiation branch is a routing radiation branch arranged on the smart terminal; The compensation radiation branch is a metal frame radiation branch of the smart terminal.

5. The antenna module according to claim 1, wherein: The tuning circuit includes a second capacitor; A first end of the second capacitor is connected to the first feed source, and a second end of the second capacitor is connected to the common radiation branch.

6. The antenna module according to any one of claims 1 to 5, characterized in that: The antenna module also includes a first filtering circuit; The input end of the first filter circuit is connected to the tuning circuit, and the second end of the first filter circuit is connected to the common radiation branch; and / or, The antenna module also includes a second filtering circuit; An input end of the second filtering circuit is connected to the compensation circuit and the second feed source, and a second end of the second filtering circuit is connected to the common radiation branch.

7. The antenna module according to claim 6, characterized in that: The first filter circuit and the second filter circuit are both band-stop filter circuits; The band stop frequency of the first filter circuit is the frequency of the radio frequency signal output by the second feed source; the band stop frequency of the second filter circuit is the frequency of the radio frequency signal output by the first feed source.

8. The antenna module according to claim 7, characterized in that: The first filtering circuit includes a third capacitor and a first inductor; A first end of the third capacitor is connected to a first end of the first inductor and the tuning circuit, and a second end of the third capacitor is connected to a second end of the first inductor and the common radiation branch.

9. The antenna module according to claim 7, characterized in that: The second filtering circuit includes a fourth capacitor and a second inductor; A first end of the fourth capacitor is connected to a first end of the second inductor, the compensation circuit and the second feed source, and a second end of the fourth capacitor is connected to a second end of the second inductor and the common radiation branch.

10. An intelligent terminal, characterized in that: Comprising the antenna module as described in any one of claims 1 to 9.

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