Antenna and mobile terminal

Abstract

The embodiment of the application discloses an antenna and a mobile terminal. The antenna comprises a substrate, and a low-frequency branch, a medium-frequency branch, a high-frequency branch, a feeding point and a first grounding point are arranged on the substrate. The low-frequency branch is arranged around the feeding point and extends away from the feeding point; the high-frequency branch is arranged on the feeding point; the medium-frequency branch is arranged on the first grounding point, and extends away from the main substrate after extending a preset distance above the first grounding point; and the first grounding point is parasitically arranged on the feeding point. The switch removed from the prior art can avoid interference and loss caused by the switch and save a switch cost. Meanwhile, the low-frequency antenna is more efficient through the design of the low-frequency branch, the bandwidth is widened through debugging and matching, the robustness of the antenna is improved, and the antenna has stronger anti-interference capability. In addition, the medium and high frequency performance of the antenna can be improved, and the antenna design is miniaturized and has super bandwidth.

Description

Technical Field

[0001] This application belongs to the field of antenna technology, and in particular relates to an antenna and a mobile terminal. Background Technology

[0002] With the rapid development of the communications industry, smartphones have become ubiquitous. As a communication tool, the primary function of a mobile phone is communication, and the quality of this communication directly affects the evaluation of its functional attributes. And communication quality is largely influenced by the design quality of the phone's antenna.

[0003] Taking the low-frequency bandwidth of antennas as an example, existing antenna solutions cannot cover the bandwidth from 700 to 960 MHz with a single waveform. Switching the waveform is required to cover the 700-900 MHz bandwidth. However, antenna switching introduces losses and may also introduce noise. Furthermore, the added switching increases costs and complicates technical debugging. Therefore, optimizing mobile phone antenna design is a pressing technical problem that needs to be solved by those skilled in the art.

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

[0005] Based on this, it is necessary to propose an antenna and mobile terminal that can effectively extend the low-frequency bandwidth of the antenna and improve the problem that conventional antenna configurations cannot achieve full low-frequency coverage.

[0006] The technical problem solved by this application is achieved by the following technical solution:

[0007] This application provides an antenna, including a main substrate and a parasitic substrate arranged adjacent to each other but not overlapping; the main substrate is provided with a low-frequency stub, a high-frequency stub and a feed point, and the low-frequency stub and the high-frequency stub are electrically connected to the feed point; the parasitic substrate is provided with an intermediate-frequency stub and a first ground point that are electrically connected to each other.

[0008] In an optional embodiment of this application, the low-frequency stub includes an open-loop portion and a stub portion; the opening of the open-loop portion is disposed opposite to the first ground point, one end of the open-loop portion is disposed near the feed point, the other end of the open-loop portion is connected to the stub portion, and the stub portion extends in a direction away from the feed point; one side of the high-frequency stub is connected to the feed point, and the other side of the high-frequency stub is connected to the end of the stub portion near the feed point; the mid-frequency stub extends along the first ground point in a direction away from the main substrate.

[0009] In an optional embodiment of this application, the antenna further includes a second grounding point, which is located on the side of the stub closer to the feed point; the end of the stub away from the feed point is called the end point, and the place at a preset distance from the end point is called the connection point; the end point is split into a first branch end and a second branch end through a bifurcated double stub structure design, and the first branch end and the second branch end are connected at the connection point; the first branch end extends from the connection point in a direction away from the second grounding point; the second branch end is provided in the direction of the high-frequency stub of the first branch end pointing to the feed point.

[0010] In one optional embodiment of this application, the end is a first preset distance from the connection point; the second fork extends a second preset distance away from the connection point and the first fork.

[0011] In one optional embodiment of this application, the end is a third preset distance from the connection point; the second fork extends a fourth preset distance toward the second grounding point.

[0012] In an optional embodiment of this application, the end is a fifth preset distance from the connection point; after the second branch end is coupled close to the second grounding point, it extends away from the second grounding point and the first branch end, and the length of the side of the second branch end close to the second grounding point and the side away from the second grounding point is a sixth preset distance.

[0013] In one optional embodiment of this application, the branch section adopts a bow tie structure or a slotted structure design; when the branch section adopts a slotted structure design, the slot type is any one of U-shaped slot, L-shaped slot, H-shaped slot or annular slot.

[0014] In an optional embodiment of this application, a matching adjustment circuit and an aperture adjustment circuit are provided on the substrate; one side of the matching adjustment circuit is directly connected to the low frequency circuit, and the other side is disconnected from the aperture adjustment circuit; the matching adjustment circuit includes a first inductor, a second inductor, a first capacitor, a first adjustment unit, and a second adjustment unit; the low frequency circuit is directly connected to the first inductor and the first capacitor, and the other side of the first inductor is grounded; the other side of the first capacitor is connected to the second inductor and the first adjustment unit; the other side of the second inductor is grounded; the first adjustment unit is any one of a 0-ohm resistor, a capacitor, or an inductor, and the other side of the first adjustment unit is connected to the second adjustment unit and disconnected from the aperture adjustment circuit; the second adjustment unit is any one of a 0-ohm resistor, a capacitor, or an inductor, and the other side of the second adjustment unit is grounded; the aperture adjustment circuit includes a third inductor and a tuner, one side of the third inductor is disconnected from the matching adjustment circuit, and the other side of the third inductor is grounded; the tuner is connected in parallel to the grounded side of the third inductor.

[0015] In one optional embodiment of this application, the intermediate frequency stub is 15mm~25mm long and 3~10mm wide; and / or, the high frequency stub is 15mm~20mm long and 3~8mm wide.

[0016] This application also provides a mobile terminal, including the antenna described above.

[0017] The embodiments of this application have the following beneficial effects:

[0018] The antenna design in this application removes the switch from existing designs, thus avoiding interference and frequency band losses caused by the switch, and saving on antenna costs associated with a switch. Simultaneously, increasing the end thickness through low-frequency stub design improves low-frequency antenna efficiency, and widening the bandwidth through tuning and matching enhances antenna robustness and anti-interference capabilities. Furthermore, it improves mid-to-high frequency performance, enabling a miniaturized, ultra-wideband antenna design.

[0019] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it according to the contents of the specification, and to make the above and other objects, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. It should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit this application. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the hardware structure of a mobile terminal provided in one embodiment.

[0022] Figure 2 This is a schematic diagram of the structure of an antenna provided in one embodiment.

[0023] Figure 3 This is a schematic diagram of an existing antenna design.

[0024] Figure 4 For existing antenna S 11 Waveform diagram.

[0025] Figure 5 This is a partial enlarged view of the space between the main substrate and the parasitic substrate provided in one embodiment.

[0026] Figure 6 This is a schematic diagram of an antenna structure employing a bifurcated double-stub low-frequency stub, provided as an embodiment.

[0027] Figure 7 This is a partially enlarged view of the first structure of a low-frequency branch with bifurcated double branches provided in one embodiment.

[0028] Figure 8 This is a partially enlarged view of the second structure of a low-frequency branch with bifurcated double branches provided in one embodiment.

[0029] Figure 9 This is a partially enlarged view of the third structure of a low-frequency branch with bifurcated double branches, provided in one embodiment.

[0030] Figure 10 This is a partial enlarged view of a low-frequency branch of a bow tie structure provided in one embodiment.

[0031] Figure 11 This is a partial enlarged view of a low-frequency branch in a slotted structure provided in one embodiment.

[0032] Figure 12 A schematic diagram of a matching circuit provided in one embodiment.

[0033] Figure 13 A schematic diagram of a compatible circuit is provided for one embodiment.

[0034] Figure 14 S provided for one embodiment 11 Line graph.

[0035] Figure 15 A Smith impedance circle diagram provided for one embodiment.

[0036] Figure 16 An antenna efficiency curve is provided for one embodiment.

[0037] Figure descriptions: 11. Main substrate; 12. Parasitic substrate; 110. Low-frequency stub; 111. Open-loop portion; 112. Stub portion; 112a. First branch end; 112b. Second branch end; 112e. End; 112j. Connection point; 120. Mid-frequency stub; 130. High-frequency stub; 140. Feed point; 150. First ground point; 160. Second ground point; L1. First inductor; L2. Second inductor; L3. Third inductor; C1. First capacitor; OR. First adjustment unit; NC. Second adjustment unit; tuner. Detailed Implementation

[0038] 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 numbers 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 application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0039] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, components, features, and elements with the same names in different embodiments of this application may have the same meaning or different meanings, the specific meaning of which must be determined by its interpretation in that specific embodiment or further in conjunction with the context of that specific embodiment.

[0040] It should be understood that although the terms first, second, third, etc., may be used herein to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this document, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if," as used herein, may be interpreted as "when," "when," or "in response to determination." Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to also include the plural forms unless the context indicates otherwise. It should be further understood that the terms "comprising," "including," indicate the presence of the stated feature, step, operation, element, component, item, kind, and / or group, but do not exclude the presence, occurrence, or addition of one or more other features, steps, operations, elements, components, items, kinds, and / or groups. The terms "or," "and / or," "including at least one of the following," etc., as used in this application, may be interpreted as inclusive, or mean any one or any combination thereof. For example, "including at least one of the following: A, B, C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C." Similarly, "A, B, or C" or "A, B, and / or C" means "any one of the following: A; B; C; A and B; A and C; B and C; A and B and C." Exceptions to this definition only occur when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way.

[0041] It should be understood that although the steps in the flowcharts of this application's embodiments are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least a portion of the sub-steps or stages of other steps.

[0042] Depending on the context, the words “if” or “suppose” as used here can be interpreted as “when” or “in response to determination” or “in response to detection.” Similarly, depending on the context, the phrases “if determination” or “if detection (of the stated condition or event)” can be interpreted as “when determination” or “in response to determination” or “when detection (of the stated condition or event)” or “in response to detection (of the stated condition or event).”

[0043] It should be noted that step designations such as S10 and S20 are used in this document for the purpose of more clearly and concisely describing the corresponding content, and do not constitute a substantial limitation on the order. In specific implementation, those skilled in the art may execute S20 first and then S10, etc., but these should all be within the protection scope of this application.

[0044] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0045] In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the purpose of illustrative purposes and has no specific meaning in itself. Therefore, "module," "part," or "unit" may be used interchangeably.

[0046] Smart terminals can be implemented in various forms. For example, the smart terminals described in this application may include smart terminals such as mobile phones, tablets, laptops, handheld computers, personal digital assistants (PDAs), portable media players (PMPs), navigation devices, wearable devices, smart bracelets, pedometers, etc., as well as fixed terminals such as digital TVs and desktop computers.

[0047] The following description will use a mobile terminal as an example. Those skilled in the art will understand that, apart from elements specifically designed for mobile purposes, the construction according to the embodiments of this application can also be applied to fixed-type terminals.

[0048] Please see Figure 1 This is a schematic diagram of the hardware structure of a mobile terminal implementing various embodiments of this application. The mobile terminal 1000 may include: an RF (Radio Frequency) unit 1010, a WiFi module 1020, an audio output unit 1030, an A / V (Audio / Video) input unit 1040, a sensor 1050, a display unit 1060, a user input unit 1070, an interface unit 1080, a memory 1090, a processor 1100, and a power supply 1110, etc. Those skilled in the art will understand that... Figure 1 The mobile terminal structure shown does not constitute a limitation on the mobile terminal. The mobile terminal may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0049] The following is combined Figure 1 A detailed introduction to each component of the mobile terminal:

[0050] The radio frequency unit 1010 can be used for receiving and transmitting signals during information transmission or calls. Specifically, it receives downlink information from the base station and processes it with the processor 1100; additionally, it transmits uplink data to the base station. Typically, the radio frequency unit 1010 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low-noise amplifier, and a duplexer. Furthermore, the radio frequency unit 1010 can also communicate wirelessly with networks and other devices. The aforementioned wireless communications may 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.

[0051] WiFi is a short-range wireless transmission technology. Mobile terminals using the WiFi module 1020 can help users send and receive emails, browse web pages, and access streaming media, providing users with wireless broadband internet access. Although Figure 1 The WiFi module 1020 is shown, but it is understood that it is not a necessary component of the mobile terminal and can be omitted as needed without changing the essence of the invention.

[0052] The audio output unit 1030 can convert audio data received by the radio frequency unit 1010 or the WiFi module 1020 or stored in the memory 1090 into audio signals and output them as sound when the mobile terminal 1000 is in call signal receiving mode, call mode, recording mode, voice recognition mode, broadcast receiving mode, etc. Furthermore, the audio output unit 1030 can also provide audio output related to specific functions performed by the mobile terminal 1000 (e.g., call signal receiving sound, message receiving sound, etc.). The audio output unit 1030 may include a speaker, a buzzer, etc.

[0053] The A / V input unit 1040 is used to receive audio or video signals. The A / V input unit 1040 may include a graphics processing unit (GPU) 1041 and a microphone 1042. The GPU 1041 processes image data of still images or videos acquired by an image capture device (such as a camera) in video capture mode or image capture mode. The processed image frames can be displayed on the display unit 1060. The image frames processed by the GPU 1041 can be stored in the memory 1090 (or other storage medium) or transmitted via the radio frequency unit 1010 or the WiFi module 1020. The microphone 1042 can receive sound (audio data) in operating modes such as telephone call mode, recording mode, and voice recognition mode, and can process such sound into audio data. The processed audio (voice) data can be converted into a format that can be transmitted to a mobile communication base station via the radio frequency unit 1010 in telephone call mode. Microphone 1042 can implement various types of noise cancellation (or suppression) algorithms to eliminate (or suppress) noise or interference generated during the reception and transmission of audio signals.

[0054] The mobile terminal 1000 also includes at least one sensor 1050, 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 ambient light level, and the proximity sensor can turn off the display panel 1061 and / or backlight when the mobile terminal 1000 is moved to the ear. As a type of motion sensor, the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when stationary. It can be used for applications that recognize the phone's posture (such as landscape / portrait switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), etc. Other sensors that may be configured in the phone, such as fingerprint sensors, pressure sensors, iris sensors, molecular sensors, gyroscopes, barometers, hygrometers, thermometers, and infrared sensors, will not be described in detail here.

[0055] The display unit 1060 is used to display information input by the user or information provided to the user. The display unit 1060 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.

[0056] The user input unit 1070 can be used to receive input numerical or character information, and generate key signal inputs related to user settings and function control of the mobile terminal. Optionally, the user input unit 1070 may include a touch panel 1071 and other input devices 1072. The touch panel 1071, also known as a touch screen, can collect touch operations performed by the user on or near it (such as operations performed by the user using a finger, stylus, or any suitable object or accessory on or near the touch panel 1071), and drive corresponding connection devices according to a pre-set program. The touch panel 1071 may include a touch detection device and a touch controller. Optionally, the touch detection device detects the user's touch position and the signal generated by the touch operation, and transmits the signal to the touch controller; the touch controller receives touch information from the touch detection device, converts it into touch point coordinates, and sends it to the processor 1100, and can also receive and execute commands sent by the processor 1100. In addition, the touch panel 1071 can be implemented using various types such as resistive, capacitive, infrared, and surface acoustic wave. In addition to the touch panel 1071, the user input unit 1070 may also include other input devices 1072. Optionally, other input devices 1072 may include, but are not limited to, one or more of the following: physical keyboard, function keys (such as volume control buttons, power buttons, etc.), trackball, mouse, joystick, etc., without being specifically limited here.

[0057] 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 1100 to determine the type of touch event. Subsequently, the processor 1100 provides corresponding visual output on the display panel 1061 based on the type of touch event. Although in Figure 1 In this embodiment, the touch panel 1071 and the display panel 1061 are two independent components to realize 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 realize the input and output functions of the mobile terminal. The specific implementation is not limited here.

[0058] Interface unit 1080 serves as an interface through which at least one external device can connect to mobile terminal 1000. 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, and so on. Interface unit 1080 may be used to receive input (e.g., data, power, etc.) from the external device and transmit the received input to one or more components within mobile terminal 1000, or it may be used to transmit data between mobile terminal 1000 and the external device.

[0059] The memory 1090 can be used to store software programs and various data. The memory 1090 may primarily include a program storage area and a data storage area. Optionally, the program storage area may store the operating system, applications required for at least one function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of the mobile phone (such as audio data, phonebook, etc.). Furthermore, the memory 1090 may include high-speed random access memory, and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device.

[0060] The processor 1100 is the control center of the mobile terminal. It connects various parts of the mobile terminal via various interfaces and lines. By running or executing software programs and / or modules stored in the memory 1090, and by calling data stored in the memory 1090, it performs various functions and processes data of the mobile terminal, thereby providing overall monitoring of the mobile terminal. The processor 1100 may include one or more processing units; preferably, the processor 1100 may integrate an application processor and a modem processor. Optionally, the application processor mainly handles the operating system, user interface, and applications, while the modem processor mainly handles wireless communication. It is understood that the aforementioned modem processor may not be integrated into the processor 1100.

[0061] The mobile terminal 1000 may also include a power supply 1110 (such as a battery) that supplies power to various components. Preferably, the power supply 1110 can be logically connected to the processor 1100 through a power management system, thereby enabling functions such as charging, discharging, and power consumption management through the power management system.

[0062] although Figure 1 As not shown, the mobile terminal 1000 may also include a Bluetooth module, etc., which will not be described in detail here.

[0063] This application proposes an antenna. For a clear description of the antenna provided in this embodiment, please refer to... Figures 2-16 .

[0064] Existing antenna solutions and technologies such as Figure 3 As shown, the formed S 11 Curves Figure 4 As shown, existing designs cannot cover the 700-960MHz bandwidth with a single waveform; switching is required to change the waveform to cover this bandwidth. Adding a switch not only introduces clutter but also increases antenna manufacturing costs and technical debugging difficulty. Furthermore, existing antenna designs are sensitive to the effects of hand grip during use, leading to waveform frequency offset and reduced signal quality. To overcome the shortcomings of existing antenna designs,

[0065] This application provides an antenna. For a clear description of the specific structure of the antenna in this application, please refer to [reference needed]. Figure 2 To understand.

[0066] In one embodiment, the antenna includes a main substrate 11 and a parasitic substrate 12 that are arranged adjacently but do not overlap.

[0067] In one embodiment, the main substrate 11 is provided with a low-frequency stub 110, a high-frequency stub 130 and a feed point 140, and the low-frequency stub 110 and the high-frequency stub 130 are electrically connected to the feed point 140; the parasitic substrate 12 is provided with a medium-frequency stub 120 and a first ground point 150 that are electrically connected to each other.

[0068] In one embodiment, the low-frequency stub 110 includes an open-loop portion 111 and a stub portion 112. The opening of the open-loop portion 111 is disposed opposite to the first ground point 150. One end of the open-loop portion 111 is disposed near the feed point 140, and the other end of the open-loop portion 111 is connected to the stub portion 112, which extends away from the feed point 140. One side of the high-frequency stub 130 is connected to the feed point 140, and the other side of the high-frequency stub 130 is connected to the end of the stub portion 112 near the feed point 140. The intermediate-frequency stub 120 may be disposed near the first ground point 150, and the intermediate-frequency stub 120 extends along the first ground point 150 away from the main substrate 11.

[0069] In one embodiment, the overall size of the antenna can be approximately 35mm in length and 12mm in width.

[0070] In one embodiment, the antenna includes a main substrate 11 and a parasitic substrate 12. The main substrate 11 is provided with a low-frequency stub 110, a high-frequency stub 130, and a feed point 140; the parasitic substrate 12 is provided with an intermediate-frequency stub 120 and a first ground point 150. The focus of this application is on the design of the low-frequency stub 110, the intermediate-frequency stub 120, and the high-frequency stub 130.

[0071] In one embodiment, the low-frequency stub 110 includes an open-loop portion 111 and a stub portion 112. It is worth noting that the distinction between the open-loop portion 111 and the stub portion 112 is for ease of explanation of the structural design of the low-frequency stub 110 and does not imply that the low-frequency stub 110 is composed of two "parts"; in design, the low-frequency stub 110 is a single unit. The low-frequency stub 110 extends from the feed point 140 and is wound around the outer periphery of the feed point 140 by the open-loop portion 111. Specifically, it can be wound around the feed point 140 once, with the opening of the open-loop portion 111 facing away from the first grounding point 150. Therefore, one end of the open-loop portion 111 is positioned above the feed point 140, and the other end of the open-loop portion 111 is connected to the stub portion 112.

[0072] Furthermore, the stub portion 112, which is connected to the open loop portion 111, is located on one side of the opening of the open loop portion 111 and extends in a direction away from the power supply point 140. In a preferred embodiment, the traces within the stub portion 112 can extend all the way to the maximum trace area.

[0073] In one embodiment, the design of the low-frequency stub 110 can also be modified based on the antenna performance. Specifically, this can be achieved by observing the antenna's S... 11 If the resonant point is insufficient, the trace length can be increased by opening a slot in the branch 112 to achieve the effect of lowering the resonant point; if the waveform is too long, simply shorten the end 112e of the branch 112.

[0074] In one embodiment, the intermediate frequency stub 120 is located on the parasitic substrate 12, specifically above the first grounding point 150. After extending a predetermined distance above the first grounding point 150, the intermediate frequency stub 120 extends in a direction away from the main substrate 11.

[0075] It is worth noting that the parasitic substrate 12 also includes parasitic branches near the main substrate 11. These parasitic branches need to be as close as possible to the main substrate 11 to improve the coupling effect. For details, please refer to... Figure 5 As shown, Figure 5 A partially enlarged view of the spacing between the main substrate 11 and the parasitic substrate 12 is provided. The red line in the figure indicates the spacing between the parasitic branch and the main substrate 11. "As close as possible" means satisfying the distance between the two red lines (marked as...). l c The preset distance can be met, specifically within the range of 0.3mm to 1mm.

[0076] In one embodiment, the intermediate frequency stub 120 can also be modified to improve the performance of the antenna, specifically by adjusting the length of the end 112e of the parasitic stub or intermediate frequency stub 120.

[0077] In one embodiment, the area of ​​the intermediate frequency graft 120 can be 15mm to 25mm and 3mm to 10mm wide.

[0078] In one embodiment, a high-frequency stub 130 is disposed in the direction of the feed point 140 toward the open loop portion 111, one side of the high-frequency stub 130 is connected to the feed point 140, and the other side of the high-frequency stub 130 is connected to the end of the stub portion 112 near the feed point 140.

[0079] In one embodiment, when configuring the high-frequency stub 130, it is important to consider the utilization of other components within the device where the antenna is located. For example, if the antenna is located within a mobile terminal, the high-frequency stub 130 can be configured to utilize the USB port, specifically by placing it below the USB port. However, in reality, not all antenna designs can utilize the USB port. When an antenna is located within a mobile terminal, the signal strength is poor because the USB port is very close to the antenna, requiring avoidance. The trace end 112e of the high-frequency stub 130 can be placed near, for example, a headphone jack to avoid obstructing the USB port.

[0080] In one embodiment, the area of ​​the high-frequency branch 130 can be 15mm to 20mm and 3mm to 8mm in width.

[0081] In one embodiment, the low-frequency trace end 112e of the low-frequency stub 110 can be designed as a bifurcated double-stub structure to increase the current flow path on the antenna and achieve a broadband design. In this embodiment, the low-frequency operating bandwidth of the antenna is 700MHz~960MHz. For a clear description of the antenna under this design, please refer to... Figure 6 , Figure 6 A schematic diagram of an antenna structure employing a bifurcated double-stub low-frequency stub 110 is shown.

[0082] In one embodiment, to achieve this structure, a second grounding point 160 needs to be added to the substrate. The second grounding point 160 is located on the side of the branch portion 112 near the feed point 140. Further, the end of the branch portion 112 away from the feed point 140 is called the end 112e, and the place at a predetermined distance from the end 112e is called the connection point 112j. The end 112e is split into a first branch end 112a and a second branch end 112b by a bifurcated double branch structure design. The first branch end 112a and the second branch end 112b are connected at the connection point 112j. The first branch end 112a extends from the connection point 112j in a direction away from the second grounding point 160. The second branch end 112b is provided in the direction of the high-frequency branch 130 of the first branch end 112a pointing to the feed point 140.

[0083] In one embodiment, it is worth noting that the end 112e, connection point 112j, first branch end 112a, and second branch end 112b are all virtual parts divided from the structural class for ease of explanation; in reality, each component is closely connected within the low-frequency branch 110. Furthermore, for Figure 6 The bifurcated double-stalk low-frequency grafting 110 shown is only one implementation method; there are two other alternative implementation methods. The dimensions, structural design, and application scenarios of the low-frequency stalks 110 differ between the various schemes, which will be explained in detail later.

[0084] In one embodiment, the first structure of the bifurcated double-segmented low-frequency branch 110 is actually... Figure 6 The structure shown is illustrated. For a clear description of the structural design of the low-frequency stub 110 under the first structure, please refer to [reference needed]. Figure 7 , Figure 7 This is a magnified view of a portion of the first structure.

[0085] In one embodiment, the first preset distance between the end 112e and the connection point 112j, i.e., the length of the first forked end 112a, can be 12-20 mm; further, the width of the first forked end 112a can be 3-5 mm. The second forked end 112b extends from the connection point 112j and extends a second preset distance away from the connection point 112j and the first forked end 112a. The second preset distance can be 8-15 mm, and the width of the second forked end 112b can be 3-5 mm.

[0086] In one embodiment, for a clear description of the structural design of the low-frequency stub 110 under the second structure, please refer to... Figure 8 , Figure 8 This is a magnified view of a portion of the second structure.

[0087] In one embodiment, the distance between the end 112e and the connection point 112j is a third preset distance, that is, the length of the first branch end 112a can be 10~20mm; further, the width of the first branch end 112a can be 3~5mm. Unlike the first structure, in the second structure, the second branch end 112b extends a fourth preset distance toward the second grounding point 160, that is, the length of the second branch end 112b can be 8~15mm; further, the width of the second branch end 112b can be 2~5mm.

[0088] In one embodiment, for a clear description of the structural design of the low-frequency stub 110 under the third structure, please refer to... Figure 9 , Figure 9 This is a magnified view of a portion of the third structure.

[0089] In one embodiment, the fifth preset distance between the end 112e and the connection point 112j, i.e., the length of the first branch end 112a, can be 10~20mm; further, the width of the first branch end 112a can be 3~5mm. After the second branch end 112b approaches and couples towards the second grounding point 160, it extends away from the second grounding point 160 and the first branch end 112a. The length of the side of the second branch end 112b that approaches the second grounding point 160 and the side that moves away from the second grounding point 160 is a sixth preset distance, which can be 8~20mm; further, the width of the second branch end 112b can be 2~5mm.

[0090] In one embodiment, besides adopting the bifurcated double-branch structure described above, the branch portion 112 can also have similar wideband design alternatives, namely, adopting a bow tie structure or a slotted structure design. For the branch portion 112 adopting a bow tie structure, refer to... Figure 10 As shown; for the branch section 112 with a slotted structure, please refer to Figure 11 As shown. When the branch 112 adopts a slotted structure design, the slot type can be any one of U-shaped slot, L-shaped slot, H-shaped slot or annular slot, wherein... Figure 11 The U-shaped channel is used as an example for illustration.

[0091] In one embodiment, the antenna adapter provided in this application is equipped with a corresponding circuit.

[0092] In one embodiment, regarding the foregoing Figures 7-9 The antenna shown is a bifurcated dual-stub low-frequency stub 110 design. This application proposes a matching circuit to achieve low-frequency W-wave, extending the bandwidth to fully cover the low-frequency bands commonly used in mobile communications. The matching circuit uses a combination of a special matching adjustment circuit and an aperture adjustment circuit. For a clear description of the matching circuit provided in this application, please refer to [reference needed]. Figure 12 As shown.

[0093] In one embodiment, the matching adjustment circuit side is connected to the low-frequency stub 110 (i.e. Figure 12 The black triangle in the middle is connected to the other side, and the other side is disconnected from the aperture adjustment circuit. The matching adjustment circuit includes a first inductor L1, a second inductor L2, a first capacitor C1, a first adjustment unit OR, and a second adjustment unit NC.

[0094] The low-frequency stub 110 is connected to the first inductor L1 and the first capacitor C1, with the other side of the first inductor L1 grounded. The other side of the first capacitor C1 is connected to the second inductor L2 and the first adjustment unit OR. The other side of the second inductor L2 is grounded. The first adjustment unit OR can be any of a 0-ohm resistor, capacitor, or inductor, and can be adjusted arbitrarily according to actual conditions. The other side of the first adjustment unit OR is connected to the second adjustment unit NC, and is also disconnected from the aperture adjustment circuit. This disconnection is... Figure 12 As shown by the dashed line. The second adjustment unit NC can be any of a 0-ohm resistor, capacitor, or inductor, and the other side of the second adjustment unit NC is grounded. The specific settings of the second adjustment unit NC can be adjusted arbitrarily according to the actual situation, acting as an OR gate to connect the matching tuning and the aperture tuning. Among them, the first inductor L1, the second inductor L2, and the first capacitor C1 constitute the matching tuning.

[0095] The aperture adjustment circuit includes a third inductor L3 and a tuner. One side of the third inductor L3 is disconnected from the matching adjustment circuit, and the other side of the third inductor L3 is grounded. The tuner (shown in the dashed box in the figure) is connected in parallel to the grounded side of the third inductor L3. The third inductor L3 and the tuner constitute the aperture tuning.

[0096] In one embodiment, in addition to the matching circuit, this application also provides a compatibility circuit. The compatibility circuit is adaptable to all antenna designs provided in this application. For a clear description of the compatibility circuit provided in this application, please refer to... Figure 13 As shown.

[0097] In one implementation, such as Figure 13 As shown, the compatible circuit also changes the aperture adjustment circuit to an aperture tuning method. This involves removing the tuner and connecting a switch SW in parallel on the side where the third inductor L3 is disconnected from the matching adjustment circuit, with the other side of switch SW grounded. More precise adjustment is achieved through aperture tuning.

[0098] This application's solution removes the switch from the existing solution, then thickens the 112e trace at the end to improve the efficiency of the low-frequency antenna, and further widens the bandwidth through tuning and matching. Antenna physical sample S 11 Curves Figure 14 As shown, the Smith impedance circle diagram is as follows: Figure 15 As shown, the efficiency curve is as follows Figure 16 As shown.

[0099] As shown in the three figures, the improved antenna efficiency of this application is approximately ~10 at low frequencies and is stable. During low-frequency tuning, the waveform bandwidth is widened by using a parallel inductor and series capacitor. Then, by using another parallel inductor, the 900 Hz waveform is pulled from the third quadrant to the upper quadrant, forming a W-shaped dual-wave. The efficiency is basically not attenuated. Since the bandwidth requirement is high, which is 750 to 960 Hz, an inductor is added to the ground plane to further widen the bandwidth. This can meet the bandwidth requirement of more than 200 MHz at low frequencies. On this basis, adding optional aperture tuning can achieve coverage of a lower bandwidth with less power attenuation, realizing an ultra-wideband miniaturized antenna design.

[0100] Therefore, this application firstly expands the low-frequency bandwidth of the antenna through antenna broadband technology, improving the problem that conventional antenna configurations cannot achieve full low-frequency coverage. It also makes the tuning switch in the phone selectable, reducing losses introduced by the switch and avoiding antenna switching noise when the switch is off, thus lowering costs. Adding a switch allows for even lower low-frequency coverage up to 600MHz, while simultaneously satisfying both low-frequency ultra-wideband and MHB tunable states, making it more flexible and adjustable. Simultaneously, the widened low-frequency bandgap of the antenna improves its robustness, reduces the impact on user hand grip, and enhances the user experience. Furthermore, the antenna design of this application removes the switch from existing solutions, avoiding interference and losses in other frequency bands caused by the switch, and saving the antenna cost associated with a switch. Additionally, increasing the thickness of the end through the design of low-frequency stubs improves the efficiency of the low-frequency antenna, and further widening the bandwidth through tuning and matching enhances the antenna's robustness and anti-interference capability. Moreover, it improves the mid-to-high frequency performance of the antenna, enabling a miniaturized ultra-wideband antenna design.

[0101] This application also provides a mobile terminal, including the antenna described above. Specifically, the mobile terminal may take the form of, but is not limited to, mobile phones, tablets, personal digital assistants (PDAs), mobile internet devices (MIDs), and wearable devices (such as smartwatches). Because the mobile terminal incorporates the antenna provided in this application, it can achieve the technical effects described above.

[0102] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments described above. Any references to memory, storage, databases, or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), RAMbus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and RAMbus dynamic RAM (RDRAM), etc.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the 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 this specification.

[0104] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An antenna, characterized by It includes a main substrate (11) and a parasitic substrate (12) that are arranged adjacently but do not overlap. The main substrate (11) is provided with a low-frequency stub (110), a high-frequency stub (130) and a feed point (140), and the low-frequency stub (110) and the high-frequency stub (130) are electrically connected to the feed point (140). The parasitic substrate (12) is provided with an intermediate frequency stub (120) and a first grounding point (150) that are electrically connected to each other. The low-frequency stub (110) includes an open-loop portion (111) and a stub portion (112); the opening of the open-loop portion (111) is disposed opposite to the first grounding point (150), one end of the open-loop portion (111) is disposed near the feed point (140), the other end of the open-loop portion (111) is connected to the stub portion (112), and the stub portion (112) extends in a direction away from the feed point (140).

2. The antenna as described in claim 1, characterized in that, One side of the high-frequency stub (130) is connected to the feed point (140), and the other side of the high-frequency stub (130) is connected to the end of the stub portion (112) near the feed point (140). The intermediate frequency stub (120) extends away from the main substrate along the first ground point (150).

3. The antenna of claim 2, wherein, The antenna also includes a second grounding point (160), which is located on the side of the stub (112) near the feed point (140); The end of the branch (112) away from the power supply point (140) is called the end (112e), and the place at a predetermined distance from the end (112e) is called the connection point (112j). The end (112e) is split into a first branch end (112a) and a second branch end (112b) through a bifurcated double branch structure design. The first branch end (112a) and the second branch end (112b) are connected at the connection point (112j). The first branch end (112a) extends from the connection point (112j) in a direction away from the second grounding point (160); A second branch end (112b) is provided in the direction from the high-frequency stub (130) at the first branch end (112a) to the feed point (140).

4. The antenna of claim 3, wherein The end point (112e) is a first preset distance from the connection point (112j); The second fork end (112b) extends a second preset distance away from the connection point (112j) and the first fork end (112a).

5. The antenna of claim 3, wherein, The end point (112e) is a third preset distance from the connection point (112j); The second fork end (112b) extends a fourth preset distance toward the second grounding point (160).

6. The antenna according to claim 3, wherein The end point (112e) is a fifth preset distance from the connection point (112j); After the second fork end (112b) is coupled close to the second grounding point (160), it extends away from the second grounding point (160) and the first fork end (112a). The length of the side of the second fork end (112b) close to the second grounding point (160) and the side away from the second grounding point (160) is a sixth preset distance.

7. The antenna according to claim 1, wherein The branch section (112) adopts a bow tie structure or a slotted structure design; When the branch section (112) adopts a slotted structure design, the slotting type is any one of U-shaped slot, L-shaped slot, H-shaped slot or annular slot.

8. The antenna of any one of claims 3-6, wherein, The substrate is provided with a matching adjustment circuit and a diameter adjustment circuit. One side of the matching adjustment circuit is connected to the low-frequency stub (110), and the other side is disconnected from the aperture adjustment circuit; The matching adjustment circuit includes a first inductor, a second inductor, a first capacitor, a first adjustment unit, and a second adjustment unit; the low-frequency stub (110) is connected to the first inductor and the first capacitor, and the other side of the first inductor is grounded; the other side of the first capacitor is connected to the second inductor and the first adjustment unit; the other side of the second inductor is grounded; the first adjustment unit is any one of a 0-ohm resistor, capacitor, or inductor, and the other side of the first adjustment unit is connected to the second adjustment unit and disconnected from the aperture adjustment circuit; the second adjustment unit is any one of a 0-ohm resistor, capacitor, or inductor, and the other side of the second adjustment unit is grounded; The aperture adjustment circuit includes a third inductor and a tuner. One side of the third inductor is disconnected from the matching adjustment circuit, and the other side of the third inductor is grounded. The tuner is connected in parallel to the grounded side of the third inductor.

9. The antenna according to claim 1, wherein, The high-frequency branch (130) is 15mm~20mm long and 3~8mm wide; and / or, the medium-frequency branch (120) is 15mm~25mm long and 3~10mm wide.

10. A mobile terminal, characterized by: Includes the antenna described in any one of claims 1 to 9.

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