Antenna and electronic equipment

Abstract

The utility model discloses an antenna and electronic equipment, the antenna comprises a circuit board, a metal cover and a conductor piece, the metal cover is fixed on the circuit board and is used for forming a resonant cavity with an opening, and the conductor piece is located at one side, away from the resonant cavity, of the opening. The projection of the conductor piece on a first plane perpendicular to the circuit board is not overlapped with the projection of the opening on the first plane, and the length of the conductor is larger than that of the opening in the length direction of the opening. When the antenna works, the electromagnetic wave radiated from the opening of the resonant cavity is coupled with the electromagnetic wave radiated from the conductor piece, so that the signal of the antenna can be enhanced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of antennas and electronic devices. BACKGROUND

[0002] With the development of electronic devices such as mobile phones and tablets towards large screen ratio and small thickness, the internal space is increasingly limited, resulting in increasingly small design space for antennas.

[0003] Shielded case antennas have been widely used in electronic devices due to their small size. A shielded case antenna is a resonant cavity antenna with three ground edges and one open edge. The electromagnetic field energy is radiated through the open edge to form electromagnetic waves to emit signals.

[0004] However, the signal strength of the shielded case antenna still needs to be improved. UTILITY MODEL CONTENT

[0005] The present disclosure provides an antenna and an electronic device, which can solve the above technical problems in the related art. The technical solution is as follows:

[0006] In a first aspect, an antenna is provided, comprising a circuit board, a metal cover, and a conductor piece.

[0007] The metal cover is fixed to the circuit board and is used to form a resonant cavity with an opening.

[0008] The conductor piece is located on a side of the opening away from the resonant cavity. A projection of the conductor piece on a first plane perpendicular to the circuit board does not overlap a projection of the opening on the first plane. In the length direction of the opening, the length of the conductor piece is greater than the length of the opening.

[0009] In a possible implementation, the length of the opening is a, and 24mm≤a≤27mm. In the length direction of the opening, the length of the conductor piece is b, and 27mm<b≤40.5mm.

[0010] In a possible implementation, the distance between the projection of the conductor piece on a second plane on which the circuit board is located and the opening is c, and 2mm≤c≤5mm.

[0011] In a possible implementation, the distance between the projection of the conductor piece on the first plane and the projection of the opening on the first plane in the width direction of the opening is h, and 0.2mm≤h≤0.6mm.

[0012] In a possible implementation, the projection of the conductor piece on the second plane on which the circuit board is located partially opposes the opening.

[0013] In a possible implementation, the relative permeability of the conductor is μ, and the conductivity is σ, 1≤μ≤1.05, 10 5 S / m≤σ≤10 7 S / m.

[0014] In a possible implementation, the metal cover has a support part, which is located at the opening and fixed to the circuit board.

[0015] In a possible implementation, the support part is electrically connected to the circuit board to feed the resonant cavity.

[0016] In a second aspect, an electronic device is provided, which includes the antenna of any one of the first aspect.

[0017] In a possible implementation, the electronic device includes a back cover and a display screen, and the antenna is located between the back cover and the display screen, and the conductor is located on a side of the circuit board close to the display screen.

[0018] The technical solution provided by the present disclosure has at least the following beneficial effects:

[0019] After feeding the resonant cavity, electromagnetic waves are generated in the resonant cavity, the electromagnetic waves are reflected in the resonant cavity to form standing waves, and are radiated outward from the opening, at the same time, under the action of electromagnetic induction, induced current is also generated in the conductor outside the resonant cavity, and then electromagnetic waves are radiated, the electromagnetic waves radiated from the opening of the resonant cavity are coupled with the electromagnetic waves radiated from the conductor, so that the signal of the antenna can be enhanced.

[0020] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 is a structural schematic diagram of an antenna provided by an embodiment of the present disclosure;

[0023] Figure 2 is a structural schematic diagram of an antenna provided by an embodiment of the present disclosure in another view;

[0024] Figure 3is a structural schematic diagram of an antenna in another view according to an embodiment of the present disclosure;

[0025] Figure 4 is a structural schematic diagram of an antenna in another view according to an embodiment of the present disclosure;

[0026] Figure 5 is an experimental data diagram in an embodiment of the present disclosure;

[0027] Figure 6 is a structural schematic diagram of a shielded antenna in the related art.

[0028] Reference signs:

[0029] 1, circuit board;

[0030] 2, metal cover; 21, support part; 22, main body part;

[0031] 3, conductor piece; 31, magnet; 32, ferromagnetic body;

[0032] 4, spring sheet. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further describe the embodiments of the present disclosure in detail with reference to the drawings.

[0034] It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict. The present disclosure will be described in detail below with reference to the drawings and in combination with the embodiments.

[0035] In the related art, shielded antennas have been widely used in electronic devices. Figure 6 A shielded antenna in the related art is shown, which includes a metal cover 2, a circuit board 1, a spring sheet 4 and a ground plate, the metal cover 2 is fixedly connected with the circuit board 1, the bottom of the circuit board 1 is connected with the ground plate through the spring sheet 4, so that the circuit board 1 and the metal cover 2 located on the circuit board 1 are grounded, the part of the circuit board 1 covered by the metal cover 2 has a hollow part, which will form a resonant cavity between the metal cover 2 and the ground plate, part of the metal cover 2 is electrically connected, so as to feed the resonant cavity through the circuit board 1. After the circuit board 1 feeds the resonant cavity, electromagnetic waves will be generated in the resonant cavity, and the electromagnetic waves will be reflected in the resonant cavity to form a standing wave, so as to realize resonance at a specific frequency and enhance the signal. However, the electromagnetic waves in the resonant cavity will be radiated outward through the opening to emit signals. However, although the shielded antenna has the advantage of small size, but due to its small size, the signal strength is often difficult to improve.

[0036] The present disclosure provides an antenna, such as Figure 1As shown in the figure, the antenna comprises a circuit board 1, a metal cover 2 and a conductor piece 3. The metal cover 2 is grounded and fixed to the circuit board 1, and is used to form a resonant cavity with an opening, the conductor piece 3 is located on the side of the opening away from the resonant cavity, the projection of the conductor piece 3 on a first plane perpendicular to the circuit board 1 does not overlap the projection of the opening on the first plane, and the length of the conductor piece 3 is greater than the length of the opening in the length direction of the opening.

[0037] In this way, after feeding the resonant cavity, electromagnetic waves are generated in the resonant cavity, the electromagnetic waves are reflected in the resonant cavity to form standing waves, and are radiated outward from the opening. At the same time, under the action of electromagnetic induction, an induced current is also generated in the conductor piece 3 located on the side of the resonant cavity, and electromagnetic waves are radiated. The electromagnetic waves radiated from the opening of the resonant cavity are coupled with the electromagnetic waves radiated by the conductor piece 3, so that the signal of the antenna can be enhanced.

[0038] The embodiments of the present disclosure do not limit the material and forming method of the metal cover 2, which mainly plays the role of isolating electromagnetic signals and reflecting electromagnetic signals in the resonant cavity. For example, the metal cover 2 can be stamped from a copper alloy or injection molded from a ferrous alloy.

[0039] The embodiments of the present disclosure do not limit the material of the conductor piece 3, which mainly plays the role of electromagnetic induction and generation of electromagnetic waves to be coupled with the electromagnetic waves of the resonant cavity, thereby enhancing the signal. For example, the conductor piece 3 can be made of iron metal or a metal alloy such as a magnet 31.

[0040] In some embodiments, the length direction of the conductor piece 3 is parallel to the length direction of the opening of the resonant cavity.

[0041] In some embodiments, as shown in the figure, Figure 3 The conductor piece 3 is made of a magnet 31 and an iron block 32, wherein the magnet 31 and the iron block 32 are arranged alternately.

[0042] In the related art, the 5G frequency band is 5.17GHz-5.85GHz, the 5G center frequency is 5.5GHz, and the wavelength of the electromagnetic wave with a frequency of 5.5GHz is about 54mm, and the half wavelength is about 27mm.

[0043] In one implementation manner of the embodiments of the present disclosure, referring to Figure 2 As shown in the figure, the length of the opening is a, 24mm≤a≤27mm, and the length of the conductor piece 3 in the length direction of the opening is b, 27mm<b≤40.5mm.

[0044] In this way, by setting a near the half wavelength of the 5G center frequency, the metal cover 2 works in the half wavelength current mode of the 5G center frequency, which helps to realize the radiation of the 5G signal. Due to the influence of the antenna working environment, the length of the opening is set to be slightly smaller, which is beneficial to avoid the interference of other devices on the electromagnetic field in the resonant cavity. By setting a in the range, the radiation of the 5G signal can be facilitated, and the interference caused by the electromagnetic wave radiated by the resonant cavity can be avoided. At the same time, by setting b in the range, the conductor 3 works in the quarter wavelength working mode, and the electromagnetic wave radiated by the conductor 3 can effectively improve the signal of the antenna after coupling with the electromagnetic wave radiated by the resonant cavity.

[0045] In an implementation manner of the embodiment of the present disclosure, referring to FIG. 1, the distance between the conductor 3 and the opening in the normal projection of the second plane where the circuit board 1 is located is c, and 2mm≤c≤5mm. Figure 2

[0046] In this way, the electromagnetic wave radiated by the conductor 3 can be effectively coupled with the electromagnetic wave radiated by the resonant cavity. If c≤2mm or c≥5mm, the coupling effect between the electromagnetic wave radiated by the conductor 3 and the electromagnetic wave radiated by the resonant cavity may be reduced.

[0047] In an implementation manner of the embodiment of the present disclosure, referring to FIG. 1, the distance between the projection of the conductor 3 on the first plane and the projection of the opening on the first plane in the width direction of the opening is h, and 0.2mm≤h≤0.6mm. Figure 3 Figure 4 In this way, the electromagnetic wave radiated by the conductor 3 can be effectively coupled with the electromagnetic wave radiated by the resonant cavity. If h≤0.2mm or h≥0.6mm, it is difficult to ensure the coupling effect between the electromagnetic wave radiated by the conductor 3 and the electromagnetic wave radiated by the resonant cavity.

[0048] In this way, the electromagnetic wave radiated by the conductor 3 can be effectively coupled with the electromagnetic wave radiated by the resonant cavity. If h≤0.2mm or h≥0.6mm, it is difficult to ensure the coupling effect between the electromagnetic wave radiated by the conductor 3 and the electromagnetic wave radiated by the resonant cavity.

[0049] In an implementation manner of the embodiment of the present disclosure, referring to FIG. 1, the projection of the conductor 3 on the second plane is partially opposite to the opening. Figure 2 In this way, the electromagnetic wave radiated by the conductor 3 can be effectively coupled with the electromagnetic wave radiated by the resonant cavity. For details, refer to the experimental data described below.

[0050] In an implementation manner of the embodiment of the present disclosure, the relative permeability of the conductor 3 is μ, and the electrical conductivity is σ, 1≤μ≤1.05, 10 5 S / m≤σ≤10 7 S / m.

[0051]

[0052] ​​​The magnetic permeability of the conductor is a physical quantity for measuring the degree of difficulty of the magnetization of the conductor in a magnetic field. The higher the magnetic permeability, the higher the degree of magnetization of the conductor in the magnetic field. The electrical conductivity of the conductor is an index for measuring the ability of the conductor to conduct current and the electrical conductivity of the conductor. If the magnetic permeability of the conductor 3 is too small, the magnetization of the conductor 3 is not conducive. If the magnetic permeability of the conductor 3 is too large, it may interfere with the electromagnetic field in the resonant cavity and cause the signal strength of the antenna to decrease. If the electrical conductivity of the conductor 3 is too small, it is not conducive to generate electromagnetic waves. If the electrical conductivity of the conductor 3 is too large, it may interfere with the electromagnetic field in the resonant cavity and cause the signal strength of the antenna to decrease.

[0053] The magnetic permeability and electrical conductivity of the conductor 3 are set in this range, which can facilitate the magnetization of the conductor 3 and facilitate the emission of induced current flowing in the conductor 3, thereby facilitating the conductor 3 to radiate electromagnetic waves outward and couple with the electromagnetic waves radiated by the resonant cavity to enhance the signal of the antenna.

[0054] In an implementation manner of the embodiment of the present disclosure, the metal cover 2 has a support part 21, the support part 21 is located at the opening, and is fixed to the circuit board 1.

[0055] In this way, the metal cover 2 can be supported at the opening to improve the structural strength of the metal cover 2 and prevent the metal cover 2 from deforming.

[0056] In an implementation manner of the embodiment of the present disclosure, the support part 21 is electrically connected with the circuit board 1 to feed the resonant cavity.

[0057] In this way, while the metal cover 2 is supported at the opening by the support part 21, the resonant cavity can be fed to excite an electromagnetic field in the resonant cavity, thereby effectively utilizing the limited space and improving the space utilization rate of the antenna.

[0058] The metal cover 2 further has a main body part 22, the main body part 22 is used to form the resonant cavity, and the main body part 22 is integrally formed with the support part 21.

[0059] In some embodiments, the distance between the support part 21 and one end of the opening is between 7mm and 8.5mm.

[0060] The embodiment of the present disclosure experiments on the influence of the conductor 3 on the antenna signal under different sizes and different positions, Figure 5 The results of the experiment are shown.

[0061] In the curves ①, ② and ③, the length of the conductor 3 is greater than the length of the opening, and in the curves ④, ⑤ and ⑥, the length of the conductor 3 is less than the length of the opening. In the curves ①, the projection of the conductor 3 on the second plane is partially opposite to the opening, in the curves ②, the projection of the conductor 3 on the second plane is not opposite to the opening, and in the curves ③, the projection of the conductor 3 on the second plane is opposite to the entire opening in the length direction. In the curves ④, the projection of the conductor 3 on the second plane is partially opposite to the opening, in the curves ⑤, the projection of the conductor 3 on the second plane is not opposite to the opening, and in the curves ⑥, the projection of the conductor 3 on the second plane is opposite to the entire opening in the length direction.

[0062] In this experimental condition, when the conductor 3 is not arranged, the signal strength of the antenna in the 5G frequency band is -4.1 dB, and Table 1 shows the average signal strength of the antenna in the 5G frequency band under various conditions.

[0063] Table 1 Average signal strength of the antenna in the 5G frequency band under different experimental conditions

[0064] Curve number ① ② ③ ④ ⑤ ⑥ Signal strength -3.6 dB -3.8 dB -4.0 dB -4.2 dB -4.3 dB -4.3 dB

[0065] In combination with Figure 5 It can be seen from Table 1 that when the length of the conductor 3 is greater than the length of the opening, the conductor 3 can obviously enhance the average signal strength of the antenna in the 5G frequency band, and when the length of the conductor 3 is less than the length of the opening, the conductor 3 will interfere with the electromagnetic waves radiated by the resonant cavity and cause the signal strength of the antenna to decrease. Therefore, it is necessary for the length of the conductor 3 to be greater than the length of the opening in order for the conductor 3 to enhance the signal of the antenna in the embodiment of the present disclosure.

[0066] The embodiment of the present disclosure also provides an electronic device, which comprises the antenna mentioned above.

[0067] The present disclosure does not limit the type of electronic device. For example, the electronic device can be a mobile phone or a tablet computer.

[0068] In an implementation manner of the embodiment of the present disclosure, the electronic device comprises a back cover and a display screen, the antenna is located between the back cover and the display screen, and the conductor 3 is located on the side of the circuit board 1 close to the display screen.

[0069] In this way, the signal of the antenna can be radiated from the gap between the display screen and the back cover. By arranging the conductor 3 on the side of the circuit board 1 close to the display screen, the signal strength of the radiated electromagnetic signal can be ensured to be enhanced, and the antenna can be more conveniently installed and fixed. For example, the conductor 3 can be fixed on the frame of the electronic device.

[0070] In some embodiments, referring to Figure 3 As shown, the antenna further comprises a spring 4 fixed on the side of the circuit board 1 away from the metal shell 2 and conductive foam installed on at least one of the metal shell 2 and the circuit board 1, when the electronic device is installed, the antenna is clamped between the display screen and the back cover, wherein the conductive foam is connected with the display, and the spring 4 at the bottom of the antenna is connected with the back cover, so as to realize grounding of the antenna, thereby forming a resonant cavity between the metal shell 2 and the back cover.

[0071] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0072] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments are not intended to limit the scope of the disclosure, unless otherwise specifically stated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the specification where appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of example embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so further discussion is not required if an item is defined in one drawing.

[0073] In the description of the present disclosure, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present disclosure and simplifying the description, and does not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present disclosure; the orientation words "inner, outer" refer to the inner and outer relative to the contour of the parts themselves.

[0074] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", "lateral", "medial", "superior", "inferior", "proximal", "distal" and derivatives thereof shall relate to the application as it is shown in the drawing figures. However, it is to be understood that the application can assume various alternative orientations and, accordingly, such terms are not to be taken as limitations of the present application or any embodiments thereof described herein or is shown in the drawings.

[0075] In addition, it should be noted that the use of "first", "second", "third", etc. words to describe various components is only intended to distinguish the components from one another, and is not intended to limit the scope of protection of the present disclosure, unless otherwise stated, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0076] The above only describes the preferred embodiments of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. An antenna, characterized by The antenna comprises a circuit board (1), a metal cover (2) and a conductor piece (3); The metal cover (2) is fixed to the circuit board (1) and is used to form a resonant cavity with an opening; The conductor piece (3) is located on the side of the opening away from the resonant cavity, and the projection of the conductor piece (3) on a first plane perpendicular to the circuit board (1) does not overlap the projection of the opening on the first plane, and the length of the conductor piece (3) in the length direction of the opening is greater than the length of the opening.

2. The antenna of claim 1, wherein The length of the opening is a, and 24mm≤a≤27mm, and the length of the conductor piece (3) in the length direction of the opening is b, and 27mm<b≤40.5mm.

3. The antenna of claim 1, wherein The distance between the projection of the conductor piece (3) on a second plane on which the circuit board (1) is located and the opening is c, and 2mm≤c≤5mm.

4. The antenna of claim 1, wherein The distance between the projection of the conductor piece (3) on the first plane and the projection of the opening on the first plane in the width direction of the opening is h, and 0.2mm≤h≤0.6mm.

5. The antenna of claim 1, wherein The projection of the conductor piece (3) on the second plane on which the circuit board (1) is located has a part opposite to the opening.

6. The antenna of claim 1, wherein The relative magnetic permeability of the conductor member (3) is μ and the electrical conductivity is σ, 1 < μ < 1.05, 10 5 S / m < σ < 10 7 S / m.

7. The antenna of claim 1, wherein The metal cover (2) has a support portion (21) located at the opening and fixed to the circuit board.

8. The antenna of claim 7, wherein The support portion (21) is electrically connected to the circuit board to feed the resonant cavity.

9. An electronic device, comprising the antenna of any one of claims 1-8.

10. The electronic device of claim 9, wherein The antenna is located between the back cover and the display screen of the electronic device, and the conductor piece (3) is located on the side of the circuit board (1) close to the display screen. ​

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