An antenna module and a terminal device

Abstract

The present disclosure relates to an antenna module and a terminal device. The antenna module comprises: a first radiator; a second radiator having a gap with the first radiator; a current adjusting circuit connected between an end of the first radiator close to the gap and a ground wire, comprising: at least one first impedance element; wherein the impedance value of the first impedance element is used to adjust the current of the first radiator to adjust the radiation efficiency. Through the antenna module, the radiation efficiency of the first radiator can be adjusted.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to an antenna module and a terminal device. Background Technology

[0002] As terminal screens enter the era of full-screen displays, the space left for antenna arrangement is getting smaller and smaller. The arrival of 5G technology has placed higher demands on communication technology.

[0003] With the development of 5G, mobile phones need to integrate more antennas. Due to space limitations, the antennas have to be designed close together, but this means that the antenna radiation performance cannot be guaranteed. Summary of the Invention

[0004] This disclosure provides an antenna module and a terminal device.

[0005] According to a first aspect of the present disclosure, an antenna module is provided, comprising:

[0006] The antenna module includes:

[0007] First radiator;

[0008] The second radiator has a gap with the first radiator;

[0009] A current regulation circuit, connected between the end of the first radiator near the gap and the ground wire, includes: at least one first impedance element; wherein the impedance value of the first impedance element is used to regulate the current of the first radiator to regulate the radiation efficiency.

[0010] In one embodiment, the current regulation circuit includes:

[0011] At least one first controlled switch, and one first controlled switch is connected to one first impedance element;

[0012] Wherein, when the first controlled switch has different switching states, the first current regulating circuit has different impedances.

[0013] In one embodiment, the antenna module further includes:

[0014] First signal source;

[0015] The first impedance matching circuit has one end connected to the first feed point located in the middle of the first radiator, and the other end connected to one end of the first signal source, with the other end of the first signal source grounded.

[0016] Second signal source;

[0017] The second impedance matching circuit has one end connected to the second feed point located in the middle of the second radiator, and the other end connected to one end of the second signal source, with the other end of the second signal source grounded.

[0018] In one embodiment, the first impedance element includes:

[0019] Inductors and / or capacitors.

[0020] In one embodiment, the current regulation circuit further includes:

[0021] At least one second impedance element is connected in parallel with the at least one first impedance element; wherein the impedance value of the second impedance element is used to adjust the radiation efficiency of the first radiator;

[0022] At least one second controlled switch, wherein the second controlled switch is connected in series with a second impedance element; wherein, when the first radiator stops transmitting and receiving wireless signals, the first controlled switch is turned off and the second controlled switch is turned on.

[0023] In one embodiment, the second impedance element includes:

[0024] A resistor or a capacitor; wherein the resistance value of the resistor is less than a preset resistance value, and the capacitance value of the capacitor is greater than a preset capacitance value.

[0025] In one embodiment, the first radiator is used to transmit and receive wireless signals for cellular mobile communication; the second radiator is used to transmit and receive wireless fidelity signals.

[0026] According to a second aspect of the present disclosure, a terminal device is provided, the terminal device including the antenna module described in the first aspect above.

[0027] In one embodiment, the terminal device includes:

[0028] A first metal frame and a second metal frame having a gap; the first metal frame is reused as the first radiator of the antenna module; the second metal frame is reused as the second radiator of the antenna module.

[0029] In one embodiment, the first metal frame and the second metal frame are both located on the same side frame of the terminal device;

[0030] or,

[0031] The first metal frame and the second metal frame are respectively located on adjacent frames of the terminal device.

[0032] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects:

[0033] In the embodiments of this disclosure, a current regulation circuit is introduced into the antenna module, that is, a first impedance element is introduced into the ground terminal of the first radiator 101, so that less current returns to ground through the first impedance element, while more current flows through the first radiator, so that electromagnetic waves can be radiated outward as much as possible, thereby improving the radiation efficiency of the first radiator 101 without occupying too much space in the terminal device.

[0034] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0035] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0036] Figure 1 This is a structural example of an antenna module shown in an embodiment of the present disclosure. Figure 1 .

[0037] Figure 2 An example of current return to ground shown in this disclosure embodiment Figure 1 .

[0038] Figure 3 An example of current return to ground shown in this disclosure embodiment Figure 2 .

[0039] Figure 4 This is an example diagram illustrating a radiation efficiency in an embodiment of this formula.

[0040] Figure 5 This is a structural example of an antenna module shown in an embodiment of the present disclosure. Figure 2 .

[0041] Figure 6 This is a schematic diagram of a physical antenna using the antenna module structure described in this embodiment.

[0042] Figure 7 for Figure 6 A simplified schematic diagram of the corresponding antenna structure.

[0043] Figure 8 This is a block diagram illustrating a terminal device according to an exemplary embodiment. Detailed Implementation

[0044] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0045] Figure 1 This is a structural example of an antenna module shown in an embodiment of the present disclosure. Figure 1 ,like Figure 1 As shown, the antenna module 100 includes:

[0046] First radiator 101;

[0047] The second radiator 102 has a gap with the first radiator 101;

[0048] A current adjustment circuit 103 is connected between the end of the first radiator 101 near the gap and the ground wire, and includes at least one first impedance element; wherein the impedance value of the first impedance element is used to adjust the current of the first radiator 101 to adjust the radiation efficiency.

[0049] Antenna module 100 can be an antenna module installed in a terminal device with antenna function, such as a mobile phone, tablet computer, or smart wearable device. The terminal device transmits and receives signals through antenna module 100, enabling the terminal device to communicate with other external devices.

[0050] In embodiments of this disclosure, the first radiator 101 and the second radiator 102 are spaced apart, for example, stacked or side-by-side. Both the first radiator 101 and the second radiator 102 have impedance matching circuits for adjusting the impedance so that either the first radiator 101 or the second radiator 102 can generate a resonant mode in its respective target frequency band, thus operating in its corresponding frequency band. One end of the impedance matching circuit is connected to the radiator (first radiator 101 and second radiator 102) through a feed point, and the other end is connected to one end of a signal source, with the other end of the signal source grounded.

[0051] Impedance matching circuits can be composed of inductors and capacitors connected in series or in parallel, and the embodiments disclosed herein do not impose any limitations on this.

[0052] In embodiments of this disclosure, the first radiator 101 is used to transmit and receive wireless signals for cellular mobile communication; the second radiator 102 is used to transmit and receive wireless fidelity signals.

[0053] In this embodiment, the first radiator 101 and the second radiator 102 can be radiators used for transmitting and receiving different wireless signals. However, this embodiment is not limited to the first radiator 101 transmitting and receiving cellular mobile communication wireless signals and the second radiator 102 transmitting and receiving wireless fidelity signals. For example, the first radiator 101 or the second radiator 102 can also transmit and receive Bluetooth wireless signals, etc.

[0054] Both the first radiator 101 and the second radiator 102 include a ground terminal, but in the embodiments of this disclosure, the ground terminal of the first radiator 101 is the end near the gap, and at this end, there is also a current regulating circuit 103. Figure 1 As shown, the current regulating circuit 103 is connected between the end of the first radiator 101 near the gap and the ground wire. The current regulating circuit 103 includes at least one first impedance element. The impedance value of the first impedance element is used to regulate the current flowing through the first radiator 101 to regulate the radiation efficiency.

[0055] In one embodiment, the first impedance element includes:

[0056] Inductors and / or capacitors.

[0057] In embodiments of this disclosure, for example, an inductor with a large inductance value or a capacitor with a small capacitance value is provided in the current regulation circuit, so that less current flows through the inductor or capacitor back to ground, and the current can flow through the first radiator 101 as much as possible. That is, the field shape is adjusted to be closer to the first radiator 101, so that the electromagnetic wave can be radiated outward as much as possible, thereby improving the radiation efficiency of the first radiator 101.

[0058] In related technologies, one approach involves introducing a parasitic branch at the gap between two radiators to cancel the current coupling when the two radiators operate simultaneously. However, this method has several drawbacks. First, it requires the introduction of an additional parasitic branch, which occupies the limited space of the terminal equipment. Furthermore, if the parasitic branch is too thin and long with a narrow bandwidth, the coupling cancellation effect may be poor. Second, this solution focuses on solving the isolation problem rather than improving radiation efficiency by changing the radiation modes of the two radiators. If the parasitic branch is not properly tuned, it can easily lead to a point of maximum impedance in the sideband S11, causing the efficiency to drop too quickly.

[0059] In this disclosure, by introducing a first impedance element at the grounding terminal of the first radiator 101, not much extra space is required, and the radiation efficiency of the first radiator 101 can be improved.

[0060] It should be noted that, in the embodiments of this disclosure, since there is coupling between the first radiator 101 and the second radiator 102, the larger the inductance, the stronger the coupling. When the coupling exceeds a certain value, the radiation efficiency of the first radiator may no longer increase but instead decrease. Therefore, this disclosure needs to determine the range of values ​​for the first impedance element.

[0061] In the embodiments of this disclosure, the selection of the first impedance element can be determined based on the frequency band and length of the first radiator 101 and / or the second radiator 102, for example, by experimentally determining the value range of the first impedance element. Taking an inductor as an example, within a determined range of inductance values, the radiation efficiency of the first radiator 101 is directly proportional to the inductance value. Taking a capacitor as an example, within a determined range of capacitance values, the radiation efficiency of the first radiator 101 is inversely proportional to the capacitance value.

[0062] In one embodiment, taking a first radiator 101 with a frequency of 1.46 GHz and a first antenna length of 17 mm as an example, the adjustment range of the inductor in the current adjustment circuit 103 can be 10 to 20 nanohenries (nH). Within this adjustment range, the radiation efficiency of the first radiator 101 is proportional to the inductance value.

[0063] Figure 2 An example of current return to ground shown in this disclosure embodiment Figure 1 , Figure 3 An example of current return to ground shown in this disclosure embodiment Figure 2 . Figure 2 This describes the current flow when the first impedance element is an inductor with a impedance of 15nH. Figure 3 This refers to the current flow when the first impedance element is an inductor with a impedance of 1nH, compared to... Figure 2 and Figure 3 , Figure 2 The return current to ground marked L1 is less than Figure 3 The L2 indicator represents the return current to ground. Therefore, when the inductance value is 15nH, the current flowing through the first radiator 101 is greater than when the inductance value is 1nH, resulting in better radiation efficiency of the first radiator 101.

[0064] Figure 4 This is an example diagram illustrating a radiation efficiency in an embodiment of this formula, such as... Figure 4 As shown, the radiation efficiency curves of the first radiator 101 corresponding to the 15nH and 1nH inductors are respectively. The darker curve is the radiation efficiency corresponding to the 1nH inductor returning to ground, which is -9dB; the lighter curve is the radiation efficiency corresponding to the 15nH inductor returning to ground, which is -6dB, showing a significant improvement in efficiency.

[0065] In one embodiment, the current regulation circuit 103 includes:

[0066] At least one first controlled switch, and one first controlled switch is connected to one first impedance element;

[0067] Wherein, when the first controlled switch has different switching states, the first impedance element has different impedances.

[0068] In embodiments of this disclosure, the current regulation circuit 103 can control the operation of different first impedance elements through multiple first controlled switches. For example, when the first radiator 101 can operate in different frequency bands, the radiation efficiency is adjusted by different first impedance elements in different frequency bands. Therefore, the radiation efficiency can be adjusted by controlling the first controlled switch corresponding to the current radiation frequency band of the first radiator 101 to open.

[0069] For example, the radiation efficiency of the first radiator 101 at high frequencies (e.g., 2 GHz or 3 GHz) can be optimized by enabling an inductor with an inductance value of 20 nH.

[0070] In one embodiment, the antenna module 100 further includes:

[0071] First signal source 104;

[0072] The first impedance matching circuit 105 has one end connected to the first feed point located in the middle of the first radiator 101, and the other end connected to one end of the first signal source 104, with the other end of the first signal source 104 grounded.

[0073] Second signal source 106;

[0074] The second impedance matching circuit 107 has one end connected to the second feed point located in the middle of the second radiator 102, and the other end connected to one end of the second signal source 106, with the other end of the second signal source 106 grounded.

[0075] Figure 5 This is a structural example of an antenna module shown in an embodiment of the present disclosure. Figure 2 ,like Figure 5As shown, the antenna module 100 also includes a first signal source 104 and a first impedance matching circuit 105. One end of the first impedance matching circuit 105 is located at a first feed point A at the middle position of the first radiator 101, and the other end is connected to one end of the first signal source 104. As mentioned above, the impedance matching circuit is used to adjust the impedance so that the first radiator 101 can generate a resonant mode in its respective target frequency band to operate in the corresponding frequency band. In this embodiment, the first feed point for connecting the first impedance matching circuit 105 is located at the middle position of the first radiator 101. On the one hand, compared to the method of being located at the end of the first radiator 101 far from the gap, the problem of low radiation efficiency caused by forming a loop antenna can be reduced; on the other hand, compared to the method of being located at the end of the gap, the problem of low radiation efficiency is caused by the reduction of bandwidth.

[0076] As can be seen from the above, placing the first feed point A in the middle position can improve the radiation efficiency of the first radiator 101. Similarly, for the second radiator 102, placing the second feed point B in the middle position can improve the radiation efficiency of the second radiator 102.

[0077] Figure 6 This is a schematic diagram of a physical antenna employing the antenna module structure described in this embodiment of the present disclosure. Figure 7 for Figure 6 A simplified schematic diagram of the corresponding antenna structure. (See attached diagram.) Figure 6 As shown, the 17mm antenna is the first radiator 101 in this embodiment of the present disclosure. Figure 7 As shown, the portion marked 101 is the first radiator of this disclosure, the portion marked 102 is the second radiator of this disclosure, a gap exists between 101 and 102, the portion marked 103 is the current regulation circuit of this disclosure, the portion marked 104 is the first signal source, and the portion marked 106 is the second signal source. One end of 103 is located at the end of 101 near the gap, and the other end is connected to ground. One end of 104 is connected through a first impedance matching circuit (not shown in the figure) connected to the middle position of 101, and the other end is grounded. One end of 106 is connected through a second impedance matching circuit (not shown in the figure) connected to the middle position of 102, and the other end is grounded.

[0078] In one embodiment, the current regulation circuit 103 further includes:

[0079] At least one second impedance element is connected in parallel with the at least one first impedance element; wherein the impedance value of the second impedance element is used to adjust the radiation efficiency of the first radiator 101.

[0080] At least one second controlled switch, wherein the second controlled switch is connected in series with a second impedance element; wherein, when the first radiator 101 stops transmitting and receiving wireless signals, the first controlled switch is turned off and the second controlled switch is turned on.

[0081] In this embodiment of the present disclosure, the current regulation circuit 103 further includes at least one second impedance element and at least one second controlled switch. When the first radiator 101 is in working state and the second radiator 102 is not working, both the first and second controlled switches are turned on. The first impedance element and the second impedance element can jointly adjust the radiation efficiency of the first radiator 101, for example, to optimize the radiation performance of the first radiator 101 in the high-frequency band.

[0082] In this embodiment, when the first radiator 101 stops transmitting and receiving wireless signals, that is, when the first radiator 101 is not working, the first controlled switch is turned off and the first impedance element is not working, while the second controlled switch is turned on and the second impedance element is working, thereby adjusting the radiation efficiency of the second radiator.

[0083] In one embodiment, the second impedance element includes:

[0084] A resistor or a capacitor; wherein the resistance value of the resistor is less than a preset resistance value, and the capacitance value of the capacitor is greater than a preset capacitance value.

[0085] In this embodiment, the second impedance element can be a resistor with a resistance value less than a preset resistance value, such as a zero-resistance resistor, or a capacitor with a capacitance value greater than a preset capacitance value, such as a large capacitor. Through the second impedance element, even if the first radiator 101 is not operating, the current generated by energizing it can still return to ground through the second impedance element, thereby reducing the current flowing through the first radiator 101. This weakens the coupling between the first radiator 101 and the second radiator 102, improves the isolation between them, reduces the impact on the radiation efficiency of the second radiator 102, and thus improves the radiation efficiency of the second radiator 102.

[0086] It should be noted that, in the embodiments of this disclosure, if both the first radiator 101 and the second radiator 102 are in operation, adjusting the first and second impedance elements in the current adjustment circuit will cause the radiation efficiency of the first radiator 101 to increase, thereby decreasing the radiation efficiency of the second radiator 102; conversely, adjusting the first and second impedance elements will cause the radiation efficiency of the first radiator 101 to decrease, thereby increasing the radiation efficiency of the second radiator 102. This invention also provides a terminal device, including... Figure 1 , Figures 5 to 7 The antenna module provided in any of the embodiments. In this embodiment, the terminal device can achieve and Figure 1 , Figures 5 to 7 The same beneficial effects are shown in the embodiments, and will not be repeated here to avoid repetition.

[0087] Furthermore, in embodiments of this disclosure, the terminal device includes:

[0088] A first metal frame and a second metal frame with a gap; the first metal frame is reused as the first radiator 101 of the antenna module; the second metal frame is reused as the second radiator 102 of the antenna module.

[0089] In embodiments of this disclosure, the metal frame of the terminal device can be reused as a first radiator 101 and a second radiator 102 to reduce the space occupied by the additional antenna body.

[0090] Of course, the terminal device disclosed herein is not limited to using a metal frame reused as the first radiator 101 and the second radiator 102. The first radiator 101 and the second radiator 102 may also be laser-direct-structuring (LDS) traces, flexible printed circuit board (FPC) circuits, or steel sheet structures.

[0091] In one embodiment, the first metal frame and the second metal frame are both located on the same side frame of the terminal device;

[0092] or,

[0093] The first metal frame and the second metal frame are respectively located on adjacent frames of the terminal device.

[0094] In this embodiment, when the metal frame of the terminal device is reused as an antenna, the frame on the same side or adjacent sides can be reused as the first radiator 101 and the second radiator 102, which has the characteristics of flexible design.

[0095] Figure 8 This is a block diagram illustrating a terminal device according to an exemplary embodiment. The terminal device may be a mobile phone, tablet computer, etc.

[0096] Reference Figure 8 The terminal device may include one or more of the following components: processing component 802, memory 804, power supply component 806, multimedia component 808, audio component 810, input / output (I / O) interface 812, sensor component 814, and communication component 816.

[0097] Processing component 802 typically controls the overall operation of the terminal device, such as operations associated with display, telephone calls, data communication, camera operation, and recording. Processing component 802 may include one or more processors 820 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 802 may include one or more modules to facilitate interaction between processing component 802 and other components. For example, processing component 802 may include a multimedia module to facilitate interaction between multimedia component 808 and processing component 802.

[0098] Memory 804 is configured to store various types of data to support operation on the terminal device. Examples of this data include instructions for any application or method operating on the terminal device, contact data, phonebook data, messages, pictures, videos, etc. Memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0099] Power supply component 806 provides power to various components of the terminal device. Power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the terminal device.

[0100] Multimedia component 808 includes a screen that provides an output interface between a terminal device and a user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touchscreen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of touch or swipe actions but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 808 includes a front-facing camera and / or a rear-facing camera. When the terminal device is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0101] Audio component 810 is configured to output and / or input audio signals. For example, audio component 810 includes a microphone (MIC) configured to receive external audio signals when the terminal device is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 804 or transmitted via communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

[0102] I / O interface 812 provides an interface between processing component 802 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0103] Sensor assembly 814 includes one or more sensors for providing status assessments of various aspects of the terminal device. For example, sensor assembly 814 can detect the on / off state of the terminal device, the relative positioning of components such as the terminal device's display and keypad, changes in the position of the terminal device or a component of the terminal device, the presence or absence of user contact with the terminal device, the terminal device's orientation or acceleration / deceleration, and temperature changes. Sensor assembly 814 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, sensor assembly 814 may also include an accelerometer, a gyroscope, a magnetometer, a pressure sensor, or a temperature sensor.

[0104] Communication component 816 is configured to facilitate wired or wireless communication between the terminal device and other devices. The terminal device can access wireless networks based on communication standards, such as WiFi, 2G, or 3G, or combinations thereof. In one exemplary embodiment, communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module may be implemented based on radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0105] In an exemplary embodiment, the terminal device may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0106] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0107] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. An antenna module, characterized in that, The antenna module includes: A first radiator; a first feed point is provided at the middle position of the first radiator for connecting a first signal source; The second radiator has a gap with the first radiator; the second radiator has a second feed point for connecting to a second signal source; A current regulation circuit, connected between the end of the first radiator near the gap and the ground wire, includes: at least one first impedance element and at least one second impedance element; wherein, the impedance value of the first impedance element is used to adjust the current on the first radiator to adjust the field shape to move closer to the first radiator when the first radiator transmits and receives wireless signals, so as to improve the radiation efficiency of the first radiator. The at least one second impedance element is connected in parallel with the at least one first impedance element, and is used to return all the current on the first radiator to ground through the second impedance element when the first radiator stops transmitting and receiving wireless signals and the first impedance element is not working, thereby weakening the coupling between the first radiator and the second radiator and improving the radiation efficiency of the second radiator; wherein, the second impedance element is a resistor with a resistance value less than a preset value.

2. The antenna module according to claim 1, characterized in that, The current regulation circuit includes: At least one first controlled switch, and one first controlled switch is connected to one first impedance element; Wherein, when the first controlled switch has different switching states, the first impedance element has different impedances.

3. The antenna module according to claim 1, characterized in that, The antenna module also includes: The first impedance matching circuit has one end connected to the first feed point and the other end connected to one end of the first signal source, with the other end of the first signal source grounded. The second impedance matching circuit has one end connected to the second feed point located in the middle of the second radiator, and the other end connected to one end of the second signal source, with the other end of the second signal source grounded.

4. The antenna module according to claim 1, characterized in that, The first impedance element also includes a capacitor.

5. The antenna module according to claim 2, characterized in that, The impedance value of the second impedance element is used to adjust the radiation efficiency of the first radiator; The current regulation circuit further includes: At least one second controlled switch, wherein the second controlled switch is connected in series with a second impedance element; wherein, when the first radiator stops transmitting and receiving wireless signals, the first controlled switch is turned off and the second controlled switch is turned on.

6. The antenna module according to any one of claims 1 to 5, characterized in that, The first radiator is used to transmit and receive wireless signals for cellular mobile communication; the second radiator is used to transmit and receive wireless fidelity signals.

7. A terminal device, characterized in that, The terminal device includes: the antenna module as described in any one of claims 1 to 6.

8. The terminal device according to claim 7, characterized in that, The terminal device includes: A first metal frame and a second metal frame having a gap; the first metal frame is reused as the first radiator of the antenna module; the second metal frame is reused as the second radiator of the antenna module.

9. The terminal device according to claim 8, characterized in that, Both the first metal frame and the second metal frame are located on the same side frame of the terminal device; or, The first metal frame and the second metal frame are respectively located on adjacent frames of the terminal device.

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