Antenna device and electronic equipment

Abstract

This application discloses an antenna device and electronic device, belonging to the technical field of electronic products. The antenna device includes a radiating body and a filtering branch. The radiating body is grounded at both ends along its length. The radiating body includes a first radiator, which is connected in parallel with the filtering branch and is a continuous radiator located between its two ends. The radiating body has a first feeding point and a second feeding point symmetrically arranged about the first radiator, and the first feeding point and the second feeding point are located outside the first radiator.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic products, and specifically relates to an antenna device and an electronic device. Background Art

[0002] Currently, most electronic devices on the market are metal-framed models. Compared with plastic frames, metal frames not only have the advantage of structural strength, but also have a better appearance and feel.

[0003] Metal frames can be reused as antennas, saving space while maintaining excellent radiation efficiency. With the continuous development and advancement of communication technology, mobile devices are required to support an increasing number of frequency bands. Designing multi-band, high-efficiency antennas without compromising the appearance of the metal frame is crucial.

[0004] Currently, metal frame antennas can be divided into the following three categories based on whether they have cracks on their appearance:

[0005] The first type is a 1 / 4 wavelength fundamental mode slot antenna. This type of antenna requires a slot to cut the metal frame horizontally, with the slot area serving as the electric field intensity zone. One side of the slot can be blocked to deploy a single-branch antenna; the slot can also be used for coupling, eliminating parasitic branch radiation from the opposing antennas; or two opposing antennas can be deployed. Due to the metal disconnect, the two antennas have minimal mutual interference and provide good isolation. This antenna configuration offers flexible design, small size requirements, and good isolation between the two sides of the slot, but requires additional slots, which can affect the overall appearance of the device.

[0006] The second type is a 1 / 2-wavelength fundamental mode slot antenna. This type of antenna also requires a slot to cut the metal frame horizontally. The slot area acts as a strong electric field zone, and branches on both sides participate in radiation simultaneously. By adjusting the mode, the current on both sides of the slot flows in the same direction, achieving excellent radiation efficiency. This antenna has excellent radiation efficiency and can be integrated with the first type of antenna, but it requires a larger size and an additional slot.

[0007] The third type is the slot antenna with a fundamental mode of 1 / 2 wavelength. This type of antenna does not require a slot, but instead uses the slot area for radiation. Its radiation efficiency is lower than that of the second type of antenna, making it difficult to integrate multiple antennas and requiring a larger size. However, the lack of a slot does not affect the overall appearance of the device.

[0008] As can be seen from the above, it is difficult to reduce the antenna size or integrate multiple high-isolation antennas without any gaps. Therefore, current metal frame antennas cannot meet the appearance and size requirements of electronic devices at the same time. Summary of the Invention

[0009] The purpose of the embodiments of the present application is to provide an antenna device and an electronic device that can solve the problem that the current metal frame antenna cannot simultaneously meet the appearance and size requirements of the electronic device.

[0010] In order to solve the above technical problems, this application is implemented as follows:

[0011] In the first aspect, an embodiment of the present application provides an antenna device, comprising: a radiating body and a filtering branch; the radiating body is grounded at both ends in the length direction; the radiating body includes a first radiator, the first radiator is connected in parallel with the filtering branch, and the first radiator is a continuous radiator located between the two ends of the radiating body; a first feeding point and a second feeding point are symmetrically arranged on the radiating body with respect to the first radiator, and the first feeding point and the second feeding point are distributed outside the first radiator.

[0012] In a second aspect, an embodiment of the present application provides an electronic device, comprising: a metal frame, and further comprising the antenna device as described above;

[0013] Wherein, the radiation body is located on the metal frame.

[0014] In an embodiment of the present application, an antenna device includes a radiating body and a filtering branch, wherein a first radiator is continuous and uninterrupted between the two ends of the radiating body. The first radiator is connected in parallel with the filtering branch, so that the first radiator and the filtering branch form a band-stop filter circuit. The band-stop filter can cut off the operating current on the radiating body. The radiating body is also symmetrically provided with a first feeding point and a second feeding point about the first radiator, and the first feeding point and the second feeding point are distributed outside the first radiator. Through the first feeding point and the second feeding point, the antenna device can be connected to the feed of two antennas. Through this embodiment, the operating current on the radiating body can be cut off without a break in the radiating body, and the radiating body can be divided into two sub-radiators, so that the two antennas share a single radiating body. This does not require additional breaks for separation, and can achieve the purpose of reducing the antenna size while achieving a seamless antenna and integrating multiple high-isolation antennas. When the antenna device of this embodiment is applied to electronic equipment, the electronic equipment can meet both appearance and size requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram showing the structure of an antenna device according to an embodiment of the present invention;

[0016] Figure 2 A schematic diagram showing a band-stop filter circuit according to an embodiment of the present invention;

[0017] Figure 3 A circuit diagram showing a band-stop filter according to an embodiment of the present invention;

[0018] Figure 4 A schematic diagram showing S-parameter curves of F1 and F2 according to an embodiment of the present invention;

[0019] Figure 5A second structural diagram showing an antenna device according to an embodiment of the present invention;

[0020] Figure 6 A second schematic diagram showing a band-stop filter circuit according to an embodiment of the present invention;

[0021] Figure 7 A third structural diagram showing an antenna device according to an embodiment of the present invention;

[0022] Figure 8 FIG4 is a fourth structural diagram of an antenna device according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] A1-radiating body; P1P2-first radiator; L2-equivalent inductor; G1-first grounding point of the radiating body; G2-second grounding point of the radiating body; G0-floor; F1-first antenna feed; F2-second antenna feed; A2-first metal plate; A3-second metal plate; A4-third metal plate; C1-first capacitor; C2-second capacitor; C3-third capacitor; C0-filter capacitor. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0026] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects and are not used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of this application can be implemented in an order other than those illustrated or described herein. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0027] The control method provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0028] Please refer to Figures 1 to 8 , an embodiment of the present invention provides an antenna device, comprising: a radiating body A1 and a filtering branch; the radiating body A1 is grounded at both ends in the length direction;

[0029] The radiating body A1 includes a first radiator P1P2, which is connected in parallel with the filtering branch. The first radiator P1P2 is a continuous radiator located between the two ends of the radiating body A1; the radiating body A1 is symmetrically provided with a first feeding point and a second feeding point about the first radiator P1P2, and the first feeding point and the second feeding point are distributed outside the first radiator P1P2.

[0030] like Figure 1 As shown, the antenna device's radiating element A1 is a continuous radiator without discontinuities. The continuous radiator between P1 and P2 forms the first radiator, and the first radiators P1 and P2 have a continuous structure without discontinuities. The continuous radiator can be a straight radiator or an entirely straight radiator with small bends. The lack of discontinuities in the continuous radiator prevents the flow of current through the radiator from being physically blocked.

[0031] It should be noted that the antenna device is applied to the microwave frequency band: 0.3GHz ~ 3000GHz. For the current in this frequency band, the first radiator P1P2 can be equivalent to the following: Figure 2 The equivalent inductor L2 shown in the figure can be used as the equivalent inductor L2 for a portion of the continuous radiator on the radiating body A1. The first radiator P1P2 is connected in parallel with the filter branch to form a band-stop filter circuit. The first radiator P1P2 serves as the equivalent inductor L2 in the band-stop filter circuit for filtering. Furthermore, the longer the distance from P1 to P2, the greater the inductance of the equivalent inductor L2, the wider the band-stop filter bandwidth, and the better the filtering effect.

[0032] The band-rejection filter circuit is connected in series with the antenna radiator and is not grounded, allowing the first radiator P1P2 to function as the equivalent inductor L2. Using a grounded band-rejection filter circuit would alter the antenna mode. This means that the first radiator P1P2 has no grounding point, and neither does the filter branch.

[0033] Specifically, the band-stop filter circuit can cut off the working current on the radiation body A1, and separate the radiation body A1 into a first sub-radiator and a second sub-radiator from the current cut-off position. Figure 1 In the figure, the radiation body A1 includes a first end and a second end at both ends in the length direction, the current interruption position is P0, the radiation body between the first end and P0 is the first sub-radiator, and the radiation body between the second end and P0 is the second sub-radiator.

[0034] Part of the first radiator P1P2 (the radiator between P1 and P0) is located on the first sub-radiator, and the other part (the radiator between P2 and P0) is located on the second sub-radiator.

[0035] It should be noted that when the operating frequencies corresponding to the first and second sub-radiators are the same, the current cutoff position P0 is located near the midpoint of the length of the radiation body A1, and the lengths of the first and second sub-radiators are approximately equal.

[0036] In the above embodiment, by connecting the first radiator P1P2 in parallel with the filter branch, the first radiator P1P2 and the filter branch can form a band-stop filter circuit, which can block the working current on the radiating body A1 and achieve the effect of cutting off the current when there is no breakpoint on the radiating body.

[0037] Specifically, the band-stop filter circuit cuts off the working current on the radiating body A1, and separates the radiating body A1 into a first sub-radiator and a second sub-radiator from the current cut-off position, wherein the first feeding point is located on the first sub-radiator and the second feeding point is located on the second sub-radiator; the antenna device may also include a first antenna feed F1 and a second antenna feed F2; the first antenna feed F1 and the first sub-radiator (the radiator between the first end of the radiating body A1 and the current cut-off position P0) form a first antenna, one end of the first antenna feed F1 is connected to the first feeding point on the first sub-radiator, and the other end is grounded; the second antenna feed F2 and the second sub-radiator (the radiator between the second end of the radiating body A1 and the current cut-off position P0) form a second antenna, one end of the second antenna feed F2 is connected to the second feeding point on the second sub-radiator, and the other end is grounded; the first feeding point and the second feeding point are symmetrically distributed on both sides of the first radiator P1P2.

[0038] In a specific embodiment, the midpoint of the radiation body A1 in the length direction is located on the first radiation body P1P2.

[0039] like Figure 1 As shown, the antenna device's radiating element A1 is a continuous radiator. P0 is the midpoint of radiating element A1, and P1 and P2 are two points on either side of P0. The continuous radiator between P1 and P2 forms the first radiator. The first radiator P1P2 has a continuous structure. Here, P1 and P2 are not necessarily symmetrically distributed on either side of P0, but they must be on either side of P0.

[0040] In this embodiment, by positioning the longitudinal midpoint of radiating body A1 on first radiator P1P2, the two sub-radiators on either side of midpoint P0 form a quarter-wavelength operating mode. Conventional antennas without breakpoints, however, cannot interrupt the current, resulting in a half-wavelength mode and a doubled antenna size. This allows the antenna device of this application to be used in electronic devices while maintaining both the appearance and size requirements of the electronic device.

[0041] Optionally, the first radiator P1P2 is located in the middle of the radiation body A1 in the length direction, that is, the first end P1 and the second end P2 of the first radiator P1P2 are symmetrically distributed on both sides of P0.

[0042] See also Figure 4 The solid line shows the S parameter curves of the first antenna feed F1 and the second antenna feed F2. When the first end P1 and the second end P2 of the first radiator P1P2 are symmetrically distributed on both sides of the midpoint P0, the S parameter curves of the first antenna feed F1 and the second antenna feed F2 overlap due to the symmetry of the structures of the two branch antennas. The dotted line shows the isolation between the two antennas, which is Figure 4 It can be seen that it reaches -11dB near 2.45GHz, which shows that the two antennas with the same frequency work simultaneously and the isolation is good.

[0043] In the above embodiment, the band-stop filter circuit composed of the first radiator P1P2 and the filter branch can block the mutual influence between the operating currents of the first antenna feed F1 and the second antenna feed F2, thereby improving the isolation between the two antennas. The operating mode of the first antenna is: an inverted-F antenna (IFA) mode with a 1 / 4 wavelength from the first antenna feed F1 to the midpoint P0, and the current path of the first antenna is the L1 path (indicated by the dotted arrow); the operating mode of the second antenna is: a 1 / 4 wavelength IFA mode from the second antenna feed F2 to the midpoint P0, and its current path is the L2 path (indicated by the dotted arrow); the operating frequency of the two antennas is 2.45GHz, the mode is the same, and the structure is symmetrical.

[0044] It should be noted that similar isolation can be achieved with breakpoint antennas by connecting inductors on both sides of the breakpoint. However, when the breakpoint antenna is integrated into the metal frame of an electronic device, the presence of the breakpoint affects the appearance of the electronic device. The antenna device of the present application not only meets the design requirements of a breakpoint-free appearance, but also has the size and isolation advantages of a breakpoint antenna.

[0045] In a specific embodiment, the filtering branch includes a metal component and a capacitor connected in series.

[0046] like Figure 3 As shown, the metal parts and capacitors connected in series can be equivalent to the filter capacitor C0 in the filter branch. The filter capacitor C0 is connected in parallel at both ends of the first radiator P1P2 to form a typical band-stop filter circuit. The band-stop filter circuit can block the working currents of the first antenna feed F1 and the second antenna feed F2 from affecting each other.

[0047] like Figure 1 As shown, in a specific embodiment, the metal member includes a first metal plate A2, and the capacitor includes: a first capacitor C1 and a second capacitor C2;

[0048] One end of the first metal plate A2 is connected to the first end P1 of the first radiator P1P2 via the first capacitor C1, and the other end of the first metal plate A2 is connected to the second end P2 of the first radiator P1P2 via the second capacitor C2.

[0049] In this embodiment, the first capacitor C1 and the second capacitor C2 serve as filter capacitors in the filter branch; the first metal plate A2 is connected to the first radiator P1P2 at both ends (first end P1 and second end P2). While a resistor with zero impedance is theoretically optimal, the connected resistor will inevitably exhibit inductance at high frequencies, affecting the capacitance of the entire band-stop filter circuit (LC circuit). Therefore, the smaller the inductance, the better. Therefore, a metal plate with a large area and a smaller inductance is preferred.

[0050] See also Figure 2 By adjusting the shape and position of the first metal plate A2, the first metal plate A2 is made equivalent to a small inductor L1, such as 5nH; the first capacitor C1 and the second capacitor C2 are small capacitors, such as 1pF. When the operating frequency band is around 2.45GHz, the series inductor L1, the first capacitor C1 and the second capacitor C2 can be equivalent to a filter capacitor C0. In other words, Figure 2 The circuit structure shown can be further equivalent to Figure 3 The band-stop filter circuit shown has a resonant frequency of 2.45 GHz and can block the operating current of the first antenna feed F1 and the second antenna feed F2.

[0051] like Figure 5 As shown, in a specific embodiment, the metal member includes a second metal plate A3 and a third metal plate A4, and the capacitor includes a third capacitor C3;

[0052] One end of the second metal plate A3 is connected to the first end P1 of the first radiator P1P2, and the other end is connected to the third metal plate A4 through the third capacitor C3; one end of the third metal plate A4 is connected to the second end P2 of the first radiator P1P2, and the other end is connected to the third capacitor C3.

[0053] In this embodiment, the second metal plate A3 and the third metal plate A4 are used instead of Figure 1 The first metal plate A2 in the figure is replaced by the third capacitor C3 instead of the original first capacitor C1 and second capacitor C2. When the operating frequency band is around 2.45 GHz, the second metal plate A3, third capacitor C3 and third metal plate A4 connected in series can be equivalent to the filter capacitor C0. The second metal plate A3, third capacitor C3 and third metal plate A4 connected in series serve as a filter branch and are connected in parallel with the equivalent inductor L2 formed by the first radiator P1P2 to form a band-stop filter circuit, that is, Figure 6 The circuit structure shown can be equivalent to Figure 3The band-stop filter circuit shown.

[0054] In one embodiment, the metal member is an L-shaped metal panel or a flat metal plate.

[0055] For example, Figure 7 As shown, the first metal plate A2 is an L-shaped bent metal panel.

[0056] It should be pointed out that since the metal plate does not participate in radiation, placing it in the clearance area will affect the radiation efficiency of the antenna. By bending the metal panel, more area can be freed up for antenna clearance. The bending shape has little effect on the equivalent inductance of the metal plate, so it does not affect the filtering effect.

[0057] In addition, for Figure 1 In the case where the first metal plate A2 is a flat metal plate, if the thickness of the fuselage allows, the flat metal plate can also be placed completely horizontally (i.e. Figure 1 , the first metal plate A2 is adjusted to be perpendicular to the current Figure 1 In this way, more area can be reserved for antenna clearance to the greatest extent, reducing the impact of metal parts on antenna clearance.

[0058] Similarly, in order to reduce the impact of metal parts on antenna clearance, Figure 5 The second metal plate A3 and the third metal plate A4 shown may also be L-shaped bent metal plates, or completely horizontal flat metal plates.

[0059] In a specific embodiment, an edge of the metal piece has a notch, and the notch faces the radiation body A1.

[0060] Alternatively, as Figure 8 In the embodiment, the edge of the first metal plate A2 has a notch, and the notch faces the radiation area of ​​the radiation body A1.

[0061] Similarly, in order to reduce the impact of the metal plate on the antenna clearance, Figure 5 The second metal plate A3 and the third metal plate A4 may also be provided with notches on their edges, with the notches facing the radiation body A1.

[0062] In this embodiment, since the metal piece only serves as a connection, it can be shaped to increase the antenna clearance and reduce the impact of the metal plate on the antenna clearance by removing part of the metal in the strong electric field area of ​​the antenna.

[0063] In addition, an embodiment of the present application further provides an electronic device, including the antenna device as described above; the electronic device further includes: a metal frame, and the radiation body A1 is located on the metal frame.

[0064] Here, electronic devices include but are not limited to: mobile phones, tablets, laptops, wearable devices, etc.

[0065] Optionally, the electronic device further includes a screen, and at least a portion of the plane of the metal piece is perpendicular to the extension direction of the screen. In this way, more area can be freed up for antenna clearance, reducing the impact of the metal plate on the antenna clearance.

[0066] It should be pointed out that, if the thickness of the fuselage allows, by placing the flat metal plate completely horizontally (i.e. Figure 1 , the first metal plate A2 is adjusted to be perpendicular to the current Figure 1 In the plane extension direction of the first metal plate A2), it is possible to free up more area for antenna clearance to the greatest extent and reduce the impact of the metal plate on the antenna clearance.

[0067] In one embodiment, the metal frame includes a top frame and a floor G0, both ends of the top frame are connected to the floor G0, at least part of the top frame forms the radiation body A1, and the metal parts and capacitors are located in the space enclosed by the metal frame.

[0068] like Figure 1 As shown, the antenna device can be a non-breakpoint high-isolation WiFi 2.4G antenna located at the top of the mobile phone. A portion of the top frame of the mobile phone serves as the radiation body A1.

[0069] In one embodiment, the floor panel G0 is a printed circuit board (PCB).

[0070] Specifically, the electronic device also includes: a printed circuit board PCB; the PCB board serves as the floor G0 of the antenna device, and the radiation body A1 is respectively provided with a first grounding point and a second grounding point at both ends in the length direction, and the first grounding point and the second grounding point are electrically connected to the floor G0.

[0071] In one embodiment, the floor G0 is a fifth metal plate.

[0072] Specifically, the space formed by the metal frame includes a fifth metal plate, which is the floor G0 of the antenna device. The radiation body A1 is provided with a first grounding point and a second grounding point at both ends in the length direction, and the first grounding point and the second grounding point are electrically connected to the floor G0.

[0073] The fifth metal plate is a metal plate with a large area.

[0074] In the above embodiment, the floor G0 is the main ground in the mobile phone, which can be a large metal plate or a PCB board in the mobile phone. G1 and G2 are the ground points of A1. G1 connects the first ground point and the floor G0, and G2 connects the second ground point and the floor G0.

[0075] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also 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 statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0076] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0077] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. An antenna device, characterized in that: include: a radiation body and a filtering branch, wherein both ends of the radiation body in the length direction are grounded respectively; The radiating body includes a first radiator, the first radiator is connected in parallel with the filter branch, and the first radiator is a continuous radiator located between two ends of the radiating body; a first feeding point and a second feeding point are symmetrically arranged on the radiating body with respect to the first radiator, and the first feeding point and the second feeding point are distributed outside the first radiator; The filtering branch includes a metal part and a capacitor connected in series, and an edge of the metal part has a notch, which faces the radiation body.

2. The antenna device according to claim 1, wherein The midpoint of the radiation body in the length direction is located on the first radiation body.

3. The antenna device according to claim 1, wherein The metal member includes a first metal plate, and the capacitor includes: a first capacitor and a second capacitor; One end of the first metal plate is connected to the first end of the first radiator through the first capacitor, and the other end of the first metal plate is connected to the second end of the first radiator through the second capacitor.

4. The antenna device according to claim 1, wherein The metal member includes a second metal plate and a third metal plate, and the capacitor includes a third capacitor; One end of the second metal plate is connected to the first end of the first radiator, and the other end is connected to the third metal plate via the third capacitor; One end of the third metal plate is connected to the second end of the first radiator, and the other end is connected to the third capacitor.

5. The antenna device according to claim 1, wherein The metal piece is an L-shaped metal panel or a flat metal plate.

6. An electronic device, characterized in that: include: The metal frame further comprises the antenna device according to any one of claims 1 to 5; Wherein, the radiation body is located on the metal frame.

7. The electronic device according to claim 6, wherein: The metal frame includes a top frame and a floor. Both ends of the top frame are connected to the floor respectively. At least a portion of the top frame forms the radiation body. The metal parts and capacitors of the antenna device are located in the space enclosed by the metal frame.

8. The electronic device according to claim 6, wherein: A screen is also included, and at least a portion of a plane of the metal part of the antenna device is perpendicular to the screen.

9. The electronic device according to claim 7, wherein: The floor is a printed circuit board (PCB).

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