Antenna device and electronic equipment

Abstract

The invention provides an antenna device and electronic equipment, the antenna device comprises a floor, a magnetic material and at least two radiators, and the floor is provided with a feed circuit; a gap is formed between every two adjacent radiators, and the radiators are connected with the feed circuit; the magnetic material is arranged between the floor and the radiators, and at least part of the magnetic material covers the electric field intensity area of each radiator. By loading the magnetic material with proper dielectric constant and magnetic conductivity and proper size between the radiator and the floor, the common-mode impedance can be adjusted, the distribution relation of a magnetic field and an electric field can be influenced, the common-mode impedance can be adjusted to be consistent with or close to the differential-mode impedance, and the application range of the antenna is widened. Therefore, the isolation degree between the two antennas can be improved under the condition that the distance between the two antennas is small, the miniaturization design of the antenna device can be achieved, the space occupied by the antenna device in the electronic equipment is reduced, and the miniaturization design of the electronic equipment can be achieved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an antenna device and an electronic device. Background Art

[0002] With the development of communication technology, the demand for the number of antennas is increasing. However, the space available for placing antennas in electronic devices is limited, and as the trend of miniaturization of devices continues to decrease, the distance between antennas has also become smaller, which will increase the mutual coupling between antenna ports, causing the antenna performance to deteriorate and affecting the communication experience. Summary of the invention

[0003] The purpose of the present application is to provide an antenna device and an electronic device, so as to achieve high isolation when there is a small distance between two adjacent antenna devices.

[0004] A first aspect of the present application provides an antenna device, comprising:

[0005] A floor, on which a feeding circuit is arranged;

[0006] at least two radiators, with a distance between two adjacent radiators, and the radiators are connected to the feeding circuit;

[0007] A magnetic material is disposed between the floor and the radiators, and at least a portion of the magnetic material covers the electric field strength region of each of the radiators.

[0008] The present application can adjust the common-mode impedance and affect the distribution relationship of the magnetic field and the electric field by loading a magnetic material with appropriate dielectric constant and magnetic permeability and appropriate size between the radiator and the floor. The common-mode impedance can be adjusted to be consistent or nearly consistent with the differential-mode impedance. When there is a small distance between the two antennas, the isolation between the two antennas can be improved without changing the size of the radiator, the size of the floor, the position of the feeding circuit, etc., which is conducive to the miniaturization design of the antenna device and the reduction of the space occupied by the antenna device in the electronic device, which is conducive to the miniaturization design of the electronic device.

[0009] In a possible design, the antenna device further includes a dielectric substrate, which is disposed between the floor and the radiator, and is connected to the magnetic material. The dielectric substrate can ensure the reliability of the connection with the magnetic material and the radiator, thereby ensuring the overall structural reliability of the antenna device.

[0010] In one possible design, the magnetic material is arranged between the dielectric substrate and the floor, and / or the magnetic material is arranged between the dielectric substrate and the radiator, and / or the magnetic material is embedded in the dielectric substrate, thereby improving the flexibility of the arrangement of the magnetic material and facilitating the design and processing of the antenna device.

[0011] In a possible design, the radiator is a metal sheet, and one side of the radiator in the thickness direction is attached to the magnetic material and / or the dielectric substrate. The radiator can be configured as a microstrip patch antenna, and by loading a magnetic material between the radiator and the floor, decoupling of the two microstrip patch antennas can be achieved.

[0012] In a possible design, along the arrangement direction of two adjacent radiators, the radiator has an edge; along the thickness direction of the radiator, the projection of the magnetic material at least partially covers the edge. Wherein, a certain area at the edge of the radiator is an electric field intensity area, and by arranging the magnetic material at the edge of the radiator, the magnetic material can cover the electric field intensity area of ​​the radiator, thereby adjusting the distribution relationship of the magnetic field and the electric field to a large extent, adjusting the common mode impedance to be consistent with or close to the differential mode impedance, thereby achieving decoupling between the two antennas.

[0013] In a possible design, the magnetic permeability of the magnetic material is greater than 1, specifically in the range of 1 to 50, which can achieve a good decoupling effect.

[0014] In a possible design, the area of ​​the floor is greater than or equal to the area of ​​the magnetic material and the radiator. The larger area of ​​the floor will affect the impedance characteristics of the antenna. Without the provision of magnetic material, it is not convenient to match the impedance and it is difficult to achieve decoupling of the two antennas. In this embodiment, by loading magnetic materials with appropriate dielectric constants, magnetic permeabilities and sizes, the isolation of the two adjacent antennas can be improved to achieve decoupling when the floor area is large.

[0015] In a possible design, two adjacent radiators are symmetrically arranged.

[0016] In a possible design, a feeding point is provided on the radiator, and the radiator is electrically connected to the feeding circuit via the feeding point. The feeding points on two adjacent radiators are symmetrically arranged along the arrangement direction of the two adjacent radiators.

[0017] In a possible design, a feeding point is provided on the radiator, the radiator is electrically connected to the feeding circuit via the feeding point, and the feeding points on two adjacent radiators are asymmetrically arranged.

[0018] In a possible design, two adjacent radiators are asymmetrically arranged. The asymmetrically arranged feeding points will affect the common-mode impedance, and it is difficult to match the impedance without loading the magnetic material, and it is impossible to achieve consistency between the common-mode impedance and the differential-mode impedance. In this embodiment, by loading a magnetic material with an appropriate dielectric constant, magnetic permeability and size, the isolation of the two antennas can be improved by loading the magnetic material in a complex environment where the feeding points on the radiator are asymmetrically arranged, and decoupling can be achieved.

[0019] In a possible design, the radiator constitutes a slot antenna, a wire antenna, an IFA antenna, a left-hand antenna or a loop antenna.

[0020] The second aspect of the present application further provides an electronic device, which includes the antenna device provided by the first aspect of the present application.

[0021] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of an electronic device having an antenna device provided by an embodiment of the present application being applied in a wireless communication scenario;

[0024] Figure 3 A schematic diagram of the structure of an antenna device provided in one embodiment of the present application;

[0025] Figure 4 for Figure 3 A side view of the antenna assembly shown;

[0026] Figure 5 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0027] Figure 6 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0028] Figure 7 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0029] Figure 8 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0030] Fig. 9 for Figure 8 A side view of the antenna assembly shown;

[0031] Fig.10A graph showing a return loss coefficient and an isolation degree of an antenna device provided in one embodiment of the present application;

[0032] Fig.11 is a schematic structural diagram of an antenna device without magnetic material;

[0033] Fig.12 is a graph showing the return loss coefficient and isolation of the antenna device when no magnetic material is provided;

[0034] Fig.13 for Figure 8 The directional pattern of the antenna device shown;

[0035] Fig.14 for Fig.11 The directional pattern of the antenna device shown;

[0036] Fig.15 for Figure 8 The antenna device shown and Fig.11 The radiation efficiency comparison diagrams corresponding to the antenna devices shown are respectively shown;

[0037] Fig.16 A graph showing a return loss coefficient and an isolation degree of an antenna device provided in one embodiment of the present application;

[0038] Fig.17 is a graph showing the return loss coefficient and isolation of the antenna device when no magnetic material is provided;

[0039] Fig.18 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0040] Fig.19 for Fig.18 A side view of the antenna assembly shown;

[0041] Fig. 20 It is a comparison diagram of the return loss coefficient and isolation curve corresponding to the antenna device before and after the magnetic material is loaded;

[0042] Fig.21 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0043] Fig. 22 for Fig.21 The comparison diagram of return loss coefficient and isolation curve of the antenna device shown before and after the magnetic material is loaded;

[0044] Fig.23 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0045] Fig.24 for Fig.23 The comparison diagram of return loss coefficient and isolation curve of the antenna device shown before and after the magnetic material is loaded;

[0046] Fig.25 A side view of an antenna device provided in one embodiment of the present application;

[0047] Fig.26 for Fig.25 The comparison diagram of return loss coefficient and isolation curve of the antenna device shown before and after the magnetic material is loaded;

[0048] Fig. 27 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0049] Fig.28 for Fig. 27 The comparison diagram of return loss coefficient and isolation curve of the antenna device shown before and after the magnetic material is loaded;

[0050] Fig.29 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application;

[0051] Fig.30 for Fig.29 A side view of the antenna assembly shown;

[0052] Fig.31 for Fig.29 The shown diagram is a comparison diagram of the return loss coefficient and isolation curves corresponding to the antenna device before and after the magnetic material is loaded. Description of the drawings:

[0054] 100-Electronic equipment

[0055] 200-Base Station

[0056] 300-Satellite

[0057] 1- Floor

[0058] 2-Radiator

[0059] 21-Edge

[0060] 3-Feeding circuit

[0061] 4-Magnetic materials

[0062] 5-Dielectric substrate

[0063] 1A-Floor

[0064] 2A-Radiator

[0065] 3A-Dielectric substrate

[0066] Z-thickness direction.

[0067] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0068] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0069] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0070] With the development of communication technology, the demand for the number of antennas is increasing. However, the space available for placing antennas in electronic devices is limited, and as the trend of miniaturization of devices becomes smaller and smaller, the distance between antennas becomes smaller, which will increase the mutual coupling between antenna ports and cause the performance of antennas to deteriorate. In the traditional implementation of antenna decoupling, there is a parasitic structure introduced between the two antennas, the purpose of which is to make the direct coupling current or electric field between the two antennas and the indirect coupling current or electric field generated by the parasitic structure meet equal amplitude and opposite directions, so that the two cancel each other out to achieve decoupling of the two antennas. However, the parasitic structure introduced by this decoupling method will take up additional space, which is not conducive to the miniaturization design of antennas and electronic devices, and the isolation improvement effect is limited, and it will also change the radiation pattern of the original antenna.

[0071] In addition, there are also existing methods to adjust the isolation by changing the distance between the two antennas, the position of the feeding structure, and the size of the floor. However, the antenna has strict requirements on the floor size and feeding position, and it is difficult to take into account the requirements of floor size, feeding position and isolation at the same time. In addition, the effect is limited in electronic equipment in complex environments.

[0072] An embodiment of the present application provides an antenna device, which can be applied to electronic equipment. Figure 1 The schematic diagram of the structure of the electronic device provided in the embodiment of the present application is shown in FIG. Figure 1 , Figure 1The electronic device 100 is exemplarily shown as a mobile phone. Of course, the electronic device 100 can also be a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a personal digital assistant (PDA), an augmented reality (AR) device, a virtual reality (VR) device, an artificial intelligence (AI) device, a wearable device, a vehicle-mounted device, a smart home device and / or a smart city device. The embodiments of the present application do not impose any special restrictions on the specific type of the electronic device.

[0073] For example, Figure 2 This is a schematic diagram of an electronic device having an antenna device provided in an embodiment of the present application being used in a wireless communication scenario, with reference to Figure 2 The electronic device 100 having the antenna device can realize wireless communication between each electronic device 100 and between the satellite 300 and the base station 200.

[0074] Figure 3 A schematic diagram of the structure of an antenna device provided in one embodiment of the present application is shown in FIG. Figure 4 for Figure 3 A side view of the antenna device shown, Figure 3 and Figure 4 The antenna formed by the radiator is only exemplarily shown as a microstrip patch antenna. Of course, in some other embodiments, the radiator can also form other types of antennas, as described below. Figure 3 and Figure 4The antenna device provided in the embodiment of the present application includes a floor 1, a magnetic material 4 and at least two radiators 2. The floor 1 may generally refer to at least a part of any grounding layer, grounding plate, or grounding metal layer in an electronic device (such as a mobile phone), or at least a part of any combination of any of the above grounding layers, grounding plates, or grounding components, etc. The floor can be used for grounding components in the electronic device. In one embodiment, the floor may be a grounding layer of a circuit board of an electronic device, or a grounding plate formed by a frame of an electronic device, or a grounding metal layer formed by a metal film under a screen. In one embodiment, the circuit board may be a printed circuit board (PCB), such as an 8-layer, 10-layer, or 12-14-layer board having 8, 10, 12, 13, or 14 layers of conductive material, or an element separated and electrically insulated by a dielectric layer or insulating layer such as glass fiber, polymer, etc. A feeding circuit 3 is provided on the floor, and the feeding circuit is connected to the radiator and can feed the radiator.

[0075] Radiator 2 is a device in the antenna for receiving / sending electromagnetic wave radiation. In some cases, the "antenna" is understood in a narrow sense as a radiator, which converts the waveguide energy from the transmitter into radio waves, or converts radio waves into waveguide energy, which is used to radiate and receive radio waves. The modulated high-frequency current energy (or waveguide energy) generated by the transmitter is transmitted to the transmitting radiator via the feeder line, and is converted into a certain polarized electromagnetic wave energy by the radiator and radiated in the desired direction. The receiving radiator converts a certain polarized electromagnetic wave energy from a specific direction in space into modulated high-frequency current energy, and transmits it to the input end of the receiver via the feeder line.

[0076] The radiator 2 can be a conductor with a specific shape and size, such as a wire antenna. A wire antenna is an antenna composed of one or more metal wires whose wire diameter is much smaller than the wavelength and whose length is comparable to the wavelength, and can be used as a transmitting or receiving antenna. The main forms of wire antennas include dipole antennas, half-wave oscillator antennas, monopole antennas, loop antennas, inverted F antennas (also known as IFA, Inverted F Antenna), planar inverted F antennas (also known as PIFA, Planar Inverted F Antenna), slot antennas or slot antennas, antenna arrays, etc. For example, for a dipole antenna, each dipole antenna usually includes two radiating branches, and each branch is fed by a feeding unit from the feeding end of the radiating branch. For example, for a slot antenna or a slot antenna, a single radiating branch may be included, and both ends of the branch are grounded to form a slot or slot.

[0077] The radiator 2 may also be a slot or a slit formed on a conductor. For example, an antenna formed by a slit on a conductor surface may also be referred to as a slot antenna or a slotted antenna. In some embodiments, the slot is in the shape of a long strip. In some embodiments, the length of the slot is about half a wavelength. In some embodiments, the slot may be fed by a transmission line connected across one or both sides thereof, or by a waveguide or a resonant cavity. A radio frequency electromagnetic field is excited on the slot, and electromagnetic waves are radiated into space.

[0078] In this embodiment, there may be two, three or more radiators 2, and there is a distance between two adjacent radiators 2. As described above, each radiator 2 can be narrowly understood as an "antenna", and by providing a certain distance between two adjacent antennas, the two antennas can be guaranteed to work normally and the mutual interference between the two antennas can be reduced.

[0079] The magnetic material 4 is arranged between the floor 1 and the radiator 2, and at least part of the magnetic material 4 covers the electric field strength area of ​​each radiator 2. The magnetic material 4 can be a natural magnetic material, such as a ferrite material, and other oxides or alloy materials containing one or more of iron, cobalt, and nickel. The magnetic material 4 can also be an artificial magnetic material, which mainly refers to an electromagnetic metamaterial structure with a magnetic permeability>1 characteristic. The electromagnetic metamaterial is usually composed of a dielectric substrate and a metal pattern arranged periodically thereon. When the electromagnetic wave passes through the electromagnetic metamaterial, it presents specific electromagnetic characteristics, such as magnetic permeability>1. The magnetic material 4 has different degrees of change in the impedance value and resonant frequency of the common mode and the differential mode. The magnetic material 4 has a small effect on the differential mode impedance, but a large effect on the common mode impedance. The magnetic material 4 has a dielectric constant and a magnetic permeability. By way of example, in this embodiment, the magnetic permeability and the dielectric constant of the magnetic material 4 can both be greater than 1. By way of example, the magnetic permeability can be between 1 and 50, and the dielectric constant can be between 1 and 10. In which, when the common-mode impedance of the antenna device is greater than the differential-mode impedance, by loading a magnetic material 4 having an appropriate dielectric constant and magnetic permeability and an appropriate size, the electric field strength can be reduced and the magnetic field strength can be enhanced, thereby reducing the common-mode impedance while keeping the differential-mode impedance almost unchanged, thereby reducing the common-mode impedance to be consistent with or nearly consistent with the differential-mode impedance, thereby achieving decoupling of the two adjacent antennas.

[0080] Therefore, by loading a magnetic material 4 having an appropriate dielectric constant and magnetic permeability and an appropriate size, the isolation between the two antennas can be improved when there is a small distance between the two antennas, without changing the size of the radiator 2, the size of the floor 1, the position of the feeding circuit 3, etc., which is conducive to the miniaturization design of the antenna device and the reduction of the space occupied by the antenna device in the electronic device, which is conducive to the miniaturization design of the electronic device.

[0081] Among them, at least part of the magnetic material 4 arranged between the floor 1 and the radiator 2 needs to cover the electric field strength area of ​​each radiator 2. The electric field strength area can be displayed through simulation software. The electric field strength area has no obvious boundaries. It can be understood that within a certain area, the electric field strength is relatively large. It is only necessary to cover the magnetic material 4 in the area with relatively large electric field strength. In this way, the distribution relationship between the magnetic field and the electric field can be adjusted to a large extent, the electric field strength can be reduced, and the magnetic field strength can be enhanced, so that the common mode impedance can be adjusted to be consistent or nearly consistent with the differential mode impedance, thereby achieving decoupling between the two antennas.

[0082] As explained above, Figure 3 and Figure 4 The radiator 2 shown is configured as a microstrip patch antenna. In some other embodiments, the radiator 2 may also be configured as other types of antennas.

[0083] For example, Figure 5 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application is shown in FIG. Figure 5 The radiator 2 is shown as an inverted F antenna. Figure 5 The magnetic material 4 is filled between the two inverted-F antennas and the floor 1 , so as to achieve decoupling between the two inverted-F antennas.

[0084] For example, Figure 6 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application is shown in FIG. Figure 6 The radiator 2 is shown as a left-hand antenna. Figure 6 , the magnetic material 4 is filled between the two left-hand antennas and the floor 1, which can achieve decoupling between the two left-hand antennas.

[0085] For example, Figure 7 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application is shown in FIG. Figure 6 The radiator 2 is shown as a loop antenna, referring to Figure 7 , the magnetic material 4 is filled between the two loop antennas and the floor 1, which can achieve decoupling between the two loop antennas.

[0086] In addition, for the sake of convenience, this embodiment uses Figure 3 The radiator 2 shown is configured as a microstrip patch antenna for example. Figure 3 The magnetic material 4 can form a layered structure, the radiator 2 can be attached to one side of the magnetic material 4, and the floor 1 can be attached to the side of the magnetic material 4 facing away from the radiator 2, that is, the space between the radiator 2 and the floor 1 is only filled with the magnetic material 4.

[0087] In one embodiment, Figure 8 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application is shown in FIG. Fig. 9for Figure 8 A side view of the antenna device shown, referring to Figure 8 and Fig. 9 The antenna device may further include a dielectric substrate 5, which is disposed between the floor 1 and the radiator 2, and is connected to the magnetic material 4. In this embodiment, the dielectric substrate 5 may be a Rogers dielectric board, or a mixed dielectric board of Rogers and FR-4, etc. Here, FR-4 is a code for a flame retardant material grade, and the Rogers dielectric board is a high-frequency board. The dielectric substrate 5 has different dielectric constants depending on the selected material, and the material of the dielectric substrate 5 can be selected according to the designed antenna.

[0088] For example, refer to Figure 8 and Fig. 9 The magnetic material 4 and the dielectric substrate 5 may both be layered structures, the radiator 2 may be disposed on the dielectric substrate 5 , and the magnetic material 4 may be disposed on a side of the dielectric substrate 5 away from the radiator 2 . Figure 8 The radiator 2 shown is configured as a microstrip patch antenna, the dielectric constant of the dielectric substrate 5 is 2-3, the thickness of the dielectric substrate 5 is 3 mm, the thickness of the magnetic material 4 is 1 mm, and the dielectric constant and magnetic permeability of the magnetic material 4 can both be 3-5. Fig.10 The return loss coefficient and isolation curve of the antenna device provided in one embodiment of the present application, the horizontal axis is the frequency, the unit is GHz, the vertical axis is the return loss coefficient (S11) or the isolation (S21), the unit is dB, refer to Fig.10 The isolation of the two antennas is above 40dB, and a decoupling pit is formed. The resonant frequency of the antenna is 2.2GHz.

[0089] Fig.11 is a schematic diagram of the structure of an antenna device without magnetic material, referring to Fig.11 The antenna device includes a radiator 2A, a dielectric substrate 3A and a floor 1A. The radiator 2A is bonded to one side of the dielectric substrate 3A, and the side of the dielectric substrate 3A facing away from the radiator 2A is bonded to the floor 1A. The dielectric constant of the dielectric substrate 3A is 2 to 3, and the thickness of the dielectric substrate 3A is 4 mm. Fig.12 The graph is a return loss coefficient and isolation curve of the antenna device without magnetic material, where the horizontal axis is frequency in GHz and the vertical axis is return loss coefficient (S11) or isolation (S21) in dB. Fig.12 , the isolation of the two antennas is around 11dB. The resonant frequency of the antennas is 2.8GHz.

[0090] Compare with reference Fig.10 and Fig.12Compared with the antenna device without the magnetic material 4, the embodiment of the present application can significantly improve the isolation of the two antennas and form a decoupling pit by setting the magnetic material 4 between the radiator 2 and the floor 1. In addition, the resonant frequency of the antenna can be moved from 2.8 GHz to a lower frequency of 2.2 GHz, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0091] Fig.13 for Figure 8 The directional pattern of the antenna device shown, Fig.14 for Fig.11 The directional pattern of the antenna device shown, wherein Fig.13 The directional diagram of the antenna device when a magnetic material 4 is arranged between the radiator 2 and the floor 1 is shown. Fig.14 The directional diagram of the antenna device when no magnetic material 4 is provided between the radiator 2 and the floor 1 is shown, and the reference Fig.13 and Fig.14 In the present application, decoupling is performed by setting a magnetic material 4 between the radiator 2 and the floor 1, which does not change the directivity pattern and has similar directivity before and after decoupling.

[0092] Fig.15 for Figure 8 The antenna device shown and Fig.11 The radiation efficiency comparison diagrams corresponding to the antenna devices shown are respectively shown. Fig.15 Curve a in the figure represents Figure 8 The radiation efficiency curve corresponding to the antenna device shown in FIG. 1 is the radiation efficiency of the antenna device after decoupling by setting a magnetic material 4 between the radiator 2 and the floor 1. Curve b represents Fig.11 The radiation efficiency curve corresponding to the antenna device shown in FIG. 1 is the radiation efficiency when the magnetic material 4 is not provided. Fig.15 It can be concluded that the radiation efficiency of the antenna does not change significantly before and after decoupling, that is, arranging the magnetic material 4 between the radiator 2 and the floor 1 can improve the isolation while ensuring that the antenna device has good radiation characteristics.

[0093] In one embodiment, the antenna device may have the same Figure 8 and Fig. 9 The antenna device shown in FIG. 1 has a similar structure, that is, the antenna device includes a radiator 2, a floor 1, a dielectric substrate 5 and a magnetic material 4. The radiator 2 is a microstrip patch antenna. The dielectric constant of the dielectric substrate 5 is 2 to 3. The thickness of the dielectric substrate 5 is 3 mm. The thickness of the magnetic material 4 is 1 mm. The dielectric constant and the magnetic permeability of the magnetic material 4 can both be 15 to 18. Figure 8 and Fig. 9In the antenna device shown in the present embodiment, by improving the dielectric constant and magnetic permeability of the magnetic material 4, the distance between two adjacent antennas can be made smaller while improving the antenna isolation and ensuring the antenna radiation characteristics, thereby facilitating the miniaturization of the antenna device.

[0094] Fig.16 The return loss coefficient and isolation curve of the antenna device provided in one embodiment of the present application, the horizontal axis is the frequency, the unit is GHz, the vertical axis is the return loss coefficient (S11) or the isolation (S21), the unit is dB, refer to Fig.16 , the isolation of the two antennas is about 18dB, and a decoupling pit is formed.

[0095] Fig.17 It is a return loss coefficient and isolation curve diagram of the antenna device when no magnetic material 4 is provided, wherein the abscissa is frequency in GHz, and the ordinate is return loss coefficient (S11) or isolation (S21) in dB. Fig.17 The structure of the corresponding antenna device is Fig.11 The antenna structures shown are similar except that Fig.17 The corresponding two antennas have a relatively smaller distance between them. Fig.17 , the isolation between the two antennas is about 4dB.

[0096] Compare with reference Fig.16 and Fig.17 In this embodiment, by selecting a magnetic material 4 with a higher dielectric constant and magnetic permeability, the distance between two adjacent antennas can be further reduced, which is conducive to miniaturization and can also achieve a higher isolation between the two antennas.

[0097] Fig.18 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application is shown in FIG. Fig.19 for Fig.18 A side view of the antenna device shown, Fig.18 and Fig.19 The structure of the antenna device shown is similar to Figure 8 and Fig. 9 The structure of the antenna device shown is similar, that is, the radiator 2, the dielectric substrate 5, the magnetic material 4 and the floor 1 are stacked in sequence, the dielectric constant of the dielectric substrate 5 is 2-3, the thickness is 3mm, the thickness of the magnetic material 4 is 1mm, the dielectric constant is 2-3, and the magnetic permeability is 2-3, wherein, relative to Figure 8 and Fig. 9In the antenna device shown in the figure, the area of ​​the floor 1 in this embodiment is much larger than the area of ​​the radiator 2 and the magnetic material 4. Among them, the large area of ​​the floor 1 will affect the impedance characteristics of the antenna. In the case where the magnetic material 4 is not provided, it is not convenient to match the impedance and it is difficult to achieve decoupling of the two antennas. In this embodiment, by loading the magnetic material 4 with appropriate dielectric constant, magnetic permeability and size, the isolation of the two adjacent antennas can be improved to achieve decoupling when the area of ​​the floor 1 is large. In addition, the comparative example related to this embodiment is: the radiator, the dielectric substrate and the floor are stacked in sequence, and have the same Fig.18 The radiator 2, dielectric substrate 5 and floor 1 in the antenna device shown have the same characteristic parameters, except that the magnetic material 4 is not loaded in the comparative example, and the thickness of the dielectric substrate 5 is 4 mm.

[0098] Fig. 20 The graph is a comparison of the return loss coefficient and isolation curves of the antenna device before and after the magnetic material 4 is loaded. The horizontal axis is the frequency in GHz, and the vertical axis is the return loss coefficient (S11) or isolation (S21) in dB. Fig. 20 In the figure, curve c is the S11 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve d is the S21 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve e is the S11 curve of the antenna device in the present embodiment after the magnetic material 4 is loaded, and curve f is the S21 curve of the antenna device in the present embodiment after the magnetic material 4 is loaded. Fig. 20 Before decoupling, the isolation of the two antennas in the comparative example is about 15dB. After decoupling, the isolation of the two antennas in this embodiment is above 30dB, and a decoupling pit is formed, so that the two antennas have a high isolation. Therefore, in this embodiment, in a complex environment where the floor 1 is large in size, the isolation of the two antennas can still be improved by loading the magnetic material 4. In addition, the resonant frequency of the antenna can be moved to a lower frequency band, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0099] Fig.21 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application, referring to Fig.21The antenna device provided in this embodiment includes a radiator 2, a dielectric substrate 5, a magnetic material 4 and a floor 1 which are stacked in sequence, wherein the two radiators 2 are asymmetrically arranged. Compared with the two symmetrically arranged radiators 2, the asymmetrically arranged radiator 2 will affect the common mode impedance. It is also difficult to match the impedance without loading the magnetic material 4, and it is impossible to achieve consistency between the common mode impedance and the differential mode impedance. In this embodiment, a dielectric substrate 5 with a dielectric constant of 2 to 3 and a thickness of 3 mm can be used, and a magnetic material 4 with a dielectric constant and a magnetic permeability of 4 to 5 and a thickness of 1 mm can be loaded, so as to improve the isolation of the two asymmetrically arranged radiators 2. In addition, a comparative example related to this embodiment is: the radiator, the dielectric substrate and the floor are stacked in sequence, and have the same Fig.21 The radiator 2, dielectric substrate 5 and floor 1 in the antenna device shown have the same characteristic parameters, except that the magnetic material 4 is not loaded in the comparative example, and the thickness of the dielectric substrate 5 is 4 mm.

[0100] Fig. 22 for Fig.21 The return loss coefficient and isolation curve comparison diagram of the antenna device before and after the magnetic material 4 is loaded is shown in the figure, where the horizontal axis is the frequency in GHz and the vertical axis is the return loss coefficient (S11) or isolation (S21) in dB. Fig. 22 In the figure, curve g is the S11 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve h is the S21 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve j is the S11 curve of the antenna device in this embodiment after the magnetic material 4 is loaded, and curve k is the S21 curve of the antenna device in this embodiment after the magnetic material 4 is loaded. Fig. 22 Before decoupling, the isolation of the two antennas in the comparative example is about 4 dB. After decoupling, the isolation of the two antennas in this embodiment is above 17 dB, and a decoupling pit is formed, so that the two antennas have a high isolation. Therefore, in this embodiment, in a complex environment where the radiator 2 is asymmetrically arranged, the isolation of the two antennas can still be improved by loading the magnetic material 4. In addition, the resonant frequency of the antenna can be moved to a lower frequency band, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0101] In some other embodiments, referring to Figure 8 Two adjacent radiators 2 can be arranged symmetrically, or the isolation of the two symmetrically arranged antennas can be improved by loading a magnetic material 4 between the radiator 2 and the floor 1 .

[0102] In one embodiment, referring to Figure 8A feeding point is provided on the radiator 2, and the feeding point can be electrically connected to the feeding circuit 3, so that the radiator 2 can be fed by the feeding circuit 3. Along the arrangement direction of two adjacent symmetrically arranged radiators 2, the feeding points on the two adjacent radiators 2 are symmetrically arranged, so that the radiation characteristics of the two antennas can be easily configured. The two antennas can also be decoupled by loading a magnetic material 4 between the radiator 2 and the floor 1.

[0103] In one embodiment, Fig.23 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application, referring to Fig.23 The antenna device provided in this embodiment includes a radiator 2, a dielectric substrate 5, a magnetic material 4 and a floor 1 which are stacked in sequence. A feeding point is arranged on the radiator 2, and the feeding point can be electrically connected to the feeding circuit 3 to feed the radiator 2 through the feeding circuit 3. The feeding points on the two adjacent symmetrically arranged radiators 2 are arranged asymmetrically. Compared with setting two symmetrical feeding points on two symmetrically arranged radiators 2, the asymmetrically arranged feeding points will affect the common mode impedance. It is also difficult to match the impedance without loading the magnetic material 4, and it is impossible to achieve consistency between the common mode impedance and the differential mode impedance. In this embodiment, a dielectric substrate 5 with a dielectric constant of 2 to 3 and a thickness of 3 mm can be used, and a magnetic material 4 with a dielectric constant and a magnetic permeability of 4 to 5 and a thickness of 1 mm can be loaded, so as to improve the isolation of the two radiators 2 with asymmetrically arranged feeding points. In addition, a comparative example related to this embodiment is: the radiator, the dielectric substrate and the floor are stacked in sequence, and have the same Fig.23 The radiator 2, dielectric substrate 5 and floor 1 in the antenna device shown have the same characteristic parameters, except that the magnetic material 4 is not loaded in the comparative example, and the thickness of the dielectric substrate 5 is 4 mm.

[0104] Fig.24 for Fig.23 The return loss coefficient and isolation curve comparison diagram of the antenna device before and after the magnetic material 4 is loaded is shown in the figure, where the horizontal axis is the frequency in GHz and the vertical axis is the return loss coefficient (S11) or isolation (S21) in dB. Fig.24 In the figure, curve m is the S11 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve n is the S21 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve p is the S11 curve of the antenna device in this embodiment after the magnetic material 4 is loaded, and curve q is the S21 curve of the antenna device in this embodiment after the magnetic material 4 is loaded. Fig.24Before decoupling, the isolation of the two antennas in the comparative example is about 13dB. After decoupling, the isolation of the two antennas in this embodiment is above 25dB, and a decoupling pit is formed, so that the two antennas have a high isolation. Therefore, in this embodiment, in a complex environment where the feeding point on the radiator 2 is asymmetrically arranged, the isolation of the two antennas can still be improved by loading the magnetic material 4. In addition, the resonant frequency of the antenna can be moved to a lower frequency band, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0105] In some other embodiments, the magnetic material 4 may also be arranged between the dielectric substrate 5 and the radiator 2, or the magnetic material 4 may also be embedded inside the dielectric substrate 5. By loading the magnetic material 4 with appropriate dielectric constant and magnetic permeability, the isolation between the two antennas can be improved and decoupling can be achieved.

[0106] For example, Fig.25 A side view of an antenna device provided in an embodiment of the present application, referring to Fig.25 , the magnetic material 4 is embedded in the dielectric substrate 5, and corresponds to the edge 21 of the radiator 2 in the thickness direction Z of the radiator 2. One end of the magnetic material 4 can contact the radiator 2, and the other end of the magnetic material 4 can contact the floor 1. In this embodiment, a dielectric substrate 5 with a dielectric constant of 2 to 3 and a thickness of 3 mm can be used, and a magnetic material 4 with a dielectric constant and a magnetic permeability of 4 to 5 and a thickness of 1 mm can be loaded, thereby improving the isolation of the two antennas and achieving decoupling. In addition, a comparative example related to this embodiment is that the radiator, the dielectric substrate and the floor are stacked in sequence, and have the same Fig.25 The radiator 2, dielectric substrate 5 and floor 1 in the antenna device shown have the same characteristic parameters, except that the magnetic material 4 is not loaded in the comparative example, and the thickness of the dielectric substrate 5 is 4 mm.

[0107] Fig.26 for Fig.25 The return loss coefficient and isolation curve comparison diagram of the antenna device before and after the magnetic material 4 is loaded is shown in the figure, where the horizontal axis is the frequency in GHz and the vertical axis is the return loss coefficient (S11) or isolation (S21) in dB. Fig.26 In the figure, curve r is the S11 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve s is the S21 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve t is the S11 curve of the antenna device in this embodiment after the magnetic material 4 is loaded, and curve u is the S21 curve of the antenna device in this embodiment after the magnetic material 4 is loaded. Fig.26Before decoupling, the isolation of the two antennas in the comparative example is about 14 dB. After decoupling, the isolation of the two antennas in this embodiment is above 37 dB, and a decoupling pit is formed, so that the two antennas have a high isolation. Therefore, by embedding the magnetic material 4 into the dielectric substrate 5, the isolation of the two antennas can also be improved. In addition, the resonant frequency of the antenna can be moved to a lower frequency band, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0108] In one embodiment, referring to Fig.25 , the radiator 2 is configured as a microstrip patch antenna, and the radiator 2 has an edge 21 along the arrangement direction of two adjacent radiators 2; along the thickness direction Z of the radiator 2, the projection of the magnetic material 4 at least partially covers the edge 21 of the radiator 2. Among them, a certain area at the edge 21 of the radiator 2 is an electric field strength area, and by arranging the magnetic material 4 at the edge 21 of the radiator 2, the magnetic material 4 can cover the electric field strength area of ​​the radiator 2, so that the distribution relationship of the magnetic field and the electric field can be adjusted to a large extent, and the common mode impedance is adjusted to be consistent with or close to the differential mode impedance, so that the decoupling between the two antennas can be achieved.

[0109] As described above, the radiator 2 can constitute a microstrip patch antenna. For example, the radiator 2 can be a metal sheet. When the magnetic material 4 is arranged between the dielectric substrate 5 and the floor 1, the radiator 2 can be attached to the side of the dielectric substrate 5 facing away from the magnetic material 4; when the magnetic material 4 is arranged between the dielectric substrate 5 and the radiator 2, the radiator 2 can be attached to the side of the magnetic material 4 facing away from the dielectric substrate 5; when the magnetic material 4 is embedded in the dielectric substrate 5, the two ends of the magnetic material 4 can leak out of the dielectric substrate 5, so that the radiator 2 can be attached to the dielectric substrate 5 and the magnetic material 4 at the same time.

[0110] Of course, as described above, the radiator 2 may also constitute other types of antennas. For example, Fig. 27 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application, referring to Fig. 27, the radiator 2 can also constitute a slot antenna, that is, the radiator 2 is a slot formed on the conductor, and the slot is in the shape of a long strip. In some embodiments, the length of the slot is about half a wavelength. In some embodiments, the slot can be fed by a transmission line spanning one or both sides of it, or by a waveguide or a resonant cavity. A radio frequency electromagnetic field is excited on the slot, and electromagnetic waves are radiated into space. In this embodiment, the radiator 2, the dielectric substrate 5, the magnetic material 4 and the floor 1 are stacked in sequence. Among them, the antenna device adopts a dielectric substrate 5 with a dielectric constant of 2 to 3 and a thickness of 2 mm, and a magnetic material 4 with a dielectric constant and magnetic permeability of 5 to 10 and a thickness of 2 mm. In addition, a comparative example related to the present embodiment is: the radiator, the dielectric substrate and the floor are stacked in sequence, and have the same Fig. 27 The radiator 2, dielectric substrate 5 and floor 1 in the antenna device shown have the same characteristic parameters, except that the magnetic material 4 is not loaded in the comparative example, and the thickness of the dielectric substrate 5 is 4 mm.

[0111] Fig.28 for Fig. 27 The return loss coefficient and isolation curve comparison diagram of the antenna device before and after the magnetic material 4 is loaded is shown in the figure, where the horizontal axis is the frequency in GHz and the vertical axis is the return loss coefficient (S11) or isolation (S21) in dB. Fig.28 In the figure, curve v is the S11 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve w is the S21 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve x is the S11 curve of the antenna device in this embodiment after the magnetic material 4 is loaded, and curve y is the S21 curve of the antenna device in this embodiment after the magnetic material 4 is loaded. Fig.28 Before decoupling, the isolation of the two antennas in the comparative example is about 12 dB. After decoupling, the isolation of the two antennas in this embodiment is above 20 dB, and a decoupling pit is formed, so that the two antennas have a high isolation. Therefore, by embedding the magnetic material 4 into the dielectric substrate 5, the isolation of the two slot antennas can also be improved. In addition, the resonant frequency of the slot antenna can be moved to a lower frequency band, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0112] For example, Fig.29 A schematic diagram of the structure of an antenna device provided in another embodiment of the present application is shown in FIG. Fig.30 for Fig.29 A side view of the antenna device shown, referring to Fig.29 and Fig.30 In this embodiment, the radiator 2 is configured as a wire antenna, which is an antenna composed of one or more metal wires whose wire diameter is much smaller than the wavelength and whose length is comparable to the wavelength, and can be used as a transmitting or receiving antenna. Fig.29 , the radiator 2 in this embodiment is two straight metal wires. In this embodiment, the radiator 2, the dielectric substrate 5, the magnetic material 4 and the floor 1 are stacked in sequence. Among them, the antenna device uses a dielectric substrate 5 with a dielectric constant of 2 to 3 and a thickness of 1 mm, and a magnetic material 4 with a dielectric constant and a magnetic permeability of 2 to 5 and a thickness of 3 mm. In addition, the comparative example related to this embodiment is: the radiator, the dielectric substrate and the floor are stacked in sequence, and have the same Fig.29 The radiator 2, dielectric substrate 5 and floor 1 in the antenna device shown have the same characteristic parameters, except that the magnetic material 4 is not loaded in the comparative example, and the thickness of the dielectric substrate 5 is 4 mm.

[0113] Fig.31 for Fig.29 The return loss coefficient and isolation curve comparison diagram of the antenna device before and after the magnetic material 4 is loaded is shown in the figure, where the horizontal axis is the frequency in GHz and the vertical axis is the return loss coefficient (S11) or isolation (S21) in dB. Fig.31 In the figure, curve A is the S11 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve B is the S21 curve of the antenna device in the comparative example before the magnetic material 4 is loaded, curve C is the S11 curve of the antenna device in this embodiment after the magnetic material 4 is loaded, and curve D is the S21 curve of the antenna device in this embodiment after the magnetic material 4 is loaded. Fig.31 Before decoupling, the isolation of the two antennas in the comparative example is about 15 dB. After decoupling, the isolation of the two antennas in this embodiment is above 48 dB, and a decoupling pit is formed, so that the two antennas have a high isolation. Therefore, by embedding the magnetic material 4 into the dielectric substrate 5, the isolation of the two slot antennas can also be improved. In addition, the resonant frequency of the slot antenna can be moved to a lower frequency band, that is, without changing the overall size of the antenna device, a lower frequency resonance can be achieved, which is conducive to miniaturization of the antenna.

[0114] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An antenna device, characterized in that: include: A floor, on which a feeding circuit is arranged; at least two radiators, with a distance between two adjacent radiators, and the radiators are connected to the feeding circuit; A magnetic material is disposed between the floor and the radiators, and at least a portion of the magnetic material covers the electric field strength region of each of the radiators.

2. The antenna device according to claim 1, characterized in that The antenna device further includes a dielectric substrate, which is disposed between the floor and the radiator and is connected to the magnetic material.

3. The antenna device according to claim 2, characterized in that The magnetic material is disposed between the dielectric substrate and the floor, and / or the magnetic material is disposed between the dielectric substrate and the radiator, and / or the magnetic material is embedded in the dielectric substrate.

4. The antenna device according to claim 2, characterized in that: The radiator is a metal sheet, and one side of the radiator in the thickness direction is attached to the magnetic material and / or the dielectric substrate.

5. The antenna device according to claim 4, characterized in that: Along the arrangement direction of two adjacent radiators, the radiator has an edge; along the thickness direction of the radiator, the projection of the magnetic material at least partially covers the edge.

6. The antenna device according to any one of claims 1 to 5, characterized in that: The magnetic permeability of the magnetic material is greater than 1.

7. The antenna device according to any one of claims 1 to 5, characterized in that: The area of ​​the floor is greater than or equal to the area of ​​the magnetic material and the radiator.

8. The antenna device according to any one of claims 1 to 5, characterized in that: Two adjacent radiators are symmetrically arranged.

9. The antenna device according to claim 8, characterized in that: The radiator is provided with a feeding point, and the radiator is electrically connected to the feeding circuit via the feeding point. Along the arrangement direction of two adjacent radiators, the feeding points on two adjacent radiators are symmetrically arranged.

10. The antenna device according to claim 8, characterized in that: A feeding point is arranged on the radiator, and the radiator is electrically connected to the feeding circuit via the feeding point. The feeding points on two adjacent radiators are arranged asymmetrically.

11. The antenna device according to any one of claims 1 to 5, characterized in that: Two adjacent radiators are arranged asymmetrically.

12. The antenna device according to any one of claims 1 to 3, characterized in that: The radiator constitutes a slot antenna, a wire antenna, an IFA antenna, a left-hand antenna or a loop antenna.

13. An electronic device, characterized in that: The invention comprises the antenna device as claimed in any one of claims 1 to 12.

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