Electronic device

Abstract

The embodiment of the utility model provides electronic equipment. The electronic equipment comprises a camera, a frequency selection surface unit and an antenna, the frequency selection surface unit is arranged on an electromagnetic wave radiation path, facing the camera, of the antenna, and the frequency selection surface unit is used for reflecting electromagnetic wave radiation which comes from the antenna and is at a resonant frequency with the frequency selection surface unit.

Description

Technical Field

[0001] The present disclosure relates to the field of electronic devices, and in particular to an electronic device capable of suppressing antenna radiation from interfering with camera operation. Background Art

[0002] This section is intended to provide background information relevant to understanding the various technologies described herein. As implied by the title of this section, this is a discussion of related technologies that should not in any way imply that they are necessarily prior art. Therefore, it should be understood that any statement in this section should be read from this perspective, rather than any admission of prior art.

[0003] With the development of smart terminals in recent years, the function of mobile phone photography has become more and more powerful, and consumers are increasingly using mobile phones to take photos. The requirements of ultra-wide angle and high pixel make the size of cameras larger and larger. At the same time, with the development of 5G (5 th With the development of the fifth generation (generation) standard, the number of mobile phone antennas is increasing, and the layout of mobile phone antennas is becoming more and more compact. Such a demand inevitably leads to the layout of multiple antennas around the camera, and the distance between the camera module and the surrounding related components and the antenna is getting smaller and smaller. The electromagnetic wave energy radiated by the antenna when it is working will couple with the surrounding devices to generate coupling current, which will have a significant impact on the normal operation of the camera module. How to reduce the interference of antenna radiation energy to the camera has become a technical problem that needs to be solved urgently. Utility Model Content

[0004] According to one aspect of the present disclosure, there is provided:

[0005] An electronic device comprises a camera, a frequency selective surface unit and an antenna, wherein the frequency selective surface unit is arranged on the electromagnetic wave radiation path of the antenna toward the camera, and the frequency selective surface unit is used to reflect electromagnetic wave radiation from the antenna at a resonant frequency with the frequency selective surface unit.

[0006] According to an embodiment of the present disclosure, the frequency selective surface unit includes a dielectric substrate, a metal patch and a metal ground plane, wherein the metal patch is constructed on a first surface of the dielectric substrate, and the metal ground plane is constructed on a second surface of the dielectric substrate.

[0007] According to an embodiment of the present disclosure, the first surface of the dielectric substrate includes a plurality of periodically arranged metal patches.

[0008] According to an embodiment of the present disclosure, the perimeter of the metal patch is determined based on the radiation frequency of the antenna electromagnetic wave to be reflected, the propagation speed of the electromagnetic wave in the air, and the dielectric constant of the dielectric substrate.

[0009] According to an embodiment of the present disclosure, the dielectric substrate is made of FR4 material, the metal patch is made of copper, and the metal ground plane is made of copper.

[0010] According to an embodiment of the present disclosure, the metal patch includes a first patch unit and a second patch unit which are different in shape and circumference from each other and are spaced apart from each other.

[0011] According to an embodiment of the present disclosure, the first patch unit is configured into a square, a triangle or a circle, and the second patch unit is arranged in a containing space surrounded by the first patch unit.

[0012] According to an embodiment of the present disclosure, the second patch unit is configured as a concave square structure having a concave portion, the concave portion is disposed at the center of a side of the concave square structure, and at least two of the concave portions are disposed opposite to each other.

[0013] According to an embodiment of the present disclosure, the first patch unit is a square, and the recessed square structure of the second patch unit is a recessed square structure.

[0014] According to an embodiment of the present disclosure, the camera is a front camera, and the frequency selective surface unit is arranged on the back side of the camera.

[0015] According to an embodiment of the present disclosure, the camera is located within the interference range of the antenna. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features of the present disclosure will become apparent with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram showing the positional relationship among a camera, a frequency selective surface unit and an antenna according to an embodiment of the present disclosure is shown;

[0018] Figure 2 A schematic diagram of the structure of a frequency selective surface unit according to an embodiment of the present disclosure is shown;

[0019] Figure 3 Shown based on Figure 2 A partial enlarged side view of

[0020] Figure 4 A schematic structural plan view of another frequency selective surface unit according to an embodiment of the present disclosure is shown;

[0021] Figure 5 A schematic three-dimensional structure diagram of another frequency selective surface unit according to an embodiment of the present disclosure is shown;

[0022] Figure 6 Shown based on Figure 5 A schematic diagram of the floor plan; and

[0023] Figure 7 Shown based on Figure 5 Frequency response curve of a frequency selective surface unit. DETAILED DESCRIPTION

[0024] It is easy to understand that according to the technical solution of the present disclosure, without changing the essential spirit of the present disclosure, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific implementation modes and drawings are only exemplary descriptions of the technical solution of the present disclosure, and should not be regarded as the entirety of the present disclosure or as a limitation or restriction to the technical solution of the present disclosure.

[0025] The directional terms such as up, down, left, right, front, back, front, back, top, bottom, etc. mentioned or may be mentioned in this specification are defined relative to the structures shown in the drawings. They are relative concepts and may change accordingly according to their different positions and different usage states. Therefore, these or other directional terms should not be interpreted as restrictive terms. In addition, the terms "first", "second", "third", etc. or similar expressions are only used for description and distinction purposes, and cannot be understood as indicating or implying the relative importance of the corresponding components.

[0026] refer to Figure 1 , which shows a schematic diagram of the positional relationship of a camera, a frequency selective surface unit and an antenna according to an embodiment of the present disclosure. The figure is a side view, corresponding to a view of the camera of the electronic device from the side, that is, a view of the electronic device lying flat with the screen facing downward.

[0027] The present disclosure relates to an electronic device, which includes a camera 1, a frequency selective surface unit 2 and an antenna 3. The frequency selective surface unit 2 is arranged on an electromagnetic wave radiation path of the antenna 3 toward the camera 1, and the frequency selective surface unit 2 is used to reflect electromagnetic wave radiation from the antenna 3 that is at a resonant frequency with the frequency selective surface unit 2.

[0028] Electronic devices should be understood in a broad sense, and can cover various devices that perform information transmission, signal processing and other operations through electronic technology, such as smart phones (including foldable phones), tablets, smart head-mounted devices (such as AR glasses, AR helmets), etc. As long as they are electronic devices equipped with antennas and cameras, they can use the various technical solutions described in this disclosure.

[0029] It should also be understood that a frequency selective surface (FSS) refers to, for example, a one-dimensional or two-dimensional periodic structure composed of metal patches or aperture units arranged on a dielectric substrate, and has filtering characteristics such as bandpass (aperture-type FSS) or bandstop (patch-type FSS), and is essentially a spatial filter. This technical solution arranges the frequency selective surface unit between the antenna and the camera, thereby utilizing the spatial filtering characteristics of the frequency selective surface, so that the electromagnetic wave energy radiated toward the camera when the antenna is working is reflected by the antenna radiation signal due to the effect of the frequency selective surface, and the camera is effectively protected and prevented from being interfered by the antenna when working, so that the camera can work normally.

[0030] In addition, this technical solution sets the frequency selective surface to reflect the radiation of the mobile phone antenna to prevent interference with the camera operation. It does not affect the structure or working principle of the camera or antenna itself. It has strong compatibility and universality, and does not significantly change the overall structure of the electronic device. It can ensure the coexistence and normal operation of the camera and antenna in a cost-effective manner.

[0031] In some embodiments, when the frequency selective surface is irradiated by electromagnetic waves, the frequency selective surface will generate an induced current accordingly. The frequency selective surface itself does not absorb radio frequency energy, and its response characteristics vary with the frequency of electromagnetic wave radiation. It is almost completely transparent to incident electromagnetic waves in certain frequency bands, while it exhibits nearly total reflection characteristics to incident waves in other frequency bands. Therefore, the response characteristics to electromagnetic waves can be adjusted in a targeted manner by constructing various features of the frequency selective surface, which will be further explained below.

[0032] In order to more specifically shield the electromagnetic wave radiation of the antenna near the camera, illustratively, the antenna 3 can be arranged close to the camera 1, and the camera 1 is located within the interference range of the antenna 3. Among them, the interference range of the antenna 3 can be understood as the area where the radiation intensity is greater than the intensity threshold on the radiation path of the antenna 3, and the intensity threshold can be set based on the anti-interference ability of the camera 1. This is because the antenna close to the camera has a more direct or greater interference possibility to the camera, and the electromagnetic waves radiated by the antenna 3 have a stronger intensity at the position of the camera 1, and the electromagnetic waves radiated by the antenna 3 are more likely to affect the camera, so it can be given priority consideration and processing. Take the camera 1 as an example of a front camera. In this case, the frequency selective surface unit 2 can be arranged on, for example, attached to the back of the camera 1, and can also be integrated with the camera. It should be understood that the back refers to the side of the camera away from the display screen of the electronic device. That is to say, under this layout scheme, the frequency selective surface unit is inside the electronic device and will not be seen by the user. While performing the expected function, the original appearance design of the electronic device can be maintained. In addition, the layout on the back can also better target the antenna near the camera and the area with a strong radiation energy field near the antenna. When the energy radiated by the nearby antenna is coupled to the camera body, the frequency selective surface reflects the coupled energy of the frequency band of the antenna, so that the antenna radiation energy cannot enter the camera, thus not interfering with the camera operation. Moreover, generally speaking, the layout space or area on the back of the camera is large, so this layout design can make better use of the layout space of the camera itself, and can also play a more targeted protective role, which can prevent the energy radiated by the antenna from entering the camera with the largest area, and does not affect the appearance, nor the performance of the mobile phone antenna itself.

[0033] refer to Figure 2 and Figure 3 ,in, Figure 2 A schematic diagram showing a structure of a frequency selective surface unit according to an embodiment of the present disclosure is shown; and Figure 3 Shown based on Figure 2 A partial enlarged side view is used to show the relative position relationship of the dielectric substrate, metal patch and metal ground plane.

[0034] The frequency selective surface unit 2 includes a dielectric substrate 21 , a metal patch 22 and a metal ground plane 23 . The metal patch 22 is constructed on a first surface of the dielectric substrate 21 , and the metal ground plane 23 is constructed on a second surface of the dielectric substrate 21 .

[0035] Here, Figure 2From the perspective of perspective, the first side of the dielectric substrate is the side facing outward from the paper surface, and the second side of the dielectric substrate is the side facing inward from the paper surface. The dielectric substrate and the metal ground plane are exemplarily constructed as a cuboid, and of course, a cylinder, a prism or an irregular shape, etc. can also be used. It can be adaptively and flexibly adjusted according to actual conditions or needs, such as the accommodation space provided by the electronic device for the frequency selection surface, the shape of the component (camera) to be matched, or the design shape of the metal patch. Among them, the "ground" of the metal ground plane refers to the zero potential end. In this example, the metal patch is constructed as a hollow rectangle, and it can also be, for example, a hollow circle, triangle, trapezoid, mixed shape, irregular shape or non-closed shape. The shape, size and other characteristics of the metal patch can be adjusted according to the electromagnetic wave radiation frequency to be targeted, which will be further explained later. In addition, the metal patch can be constructed on the dielectric substrate by etching, with high processing accuracy, can realize the processing of complex shapes, has the advantages of mass production, and has a wide range of applications.

[0036] In terms of size design, it is exemplary that the perimeter of the metal patch 22 is configured to be determined based on the radiation frequency of the antenna electromagnetic wave to be reflected, the propagation speed of the electromagnetic wave in the air, and the dielectric constant of the dielectric substrate 21. Among them, the perimeter is a quantity that describes the length of the edge of a shape or object, which is the length of the structure formed by the metal patch. The perimeter of a polygon is equal to the sum of all the sides of the figure. For example, the perimeter of a circular structure is 2πr (where r is the radius and π is pi), the perimeter of a triangle is the sum of the lengths of the three sides of the triangle, and the perimeter of a quadrilateral is the sum of the lengths of the sides of the quadrilateral.

[0037] The technical solution is based on the following formula 1:

[0038]

[0039] Where λ is the wavelength in a given medium, in meters; C0 is the propagation speed of electromagnetic waves in free space (air), which is approximately 3×10 8 m / s; f is the frequency of the wave, in Hertz; ε γ is the relative dielectric constant of the dielectric substrate.

[0040] It can be seen that, when the frequency and propagation speed of the electromagnetic wave are known, by selecting the material of the dielectric substrate (the material determines the relative dielectric constant), λ can be obtained. According to the value of λ, the circumference of the metal patch can be determined. In addition, considering that the side length of the metal patch has a certain line width in practical applications, the circumference can be understood as the circumference of the outer circumference of the side length. Specific numerical examples will be given below. It should be understood that different circumference sizes correspond to different frequency characteristics. A certain precise size corresponds to a certain precise frequency point, and the frequency bands near this frequency point have similar characteristics. Therefore, a circumference point value can correspond to a frequency range and can achieve the expected effect. This formula can be used as a preliminary reference for the size design of the metal patch, and on this basis, the final parameter value can be further determined by the equivalent circuit model method or software numerical simulation analysis to achieve the reflection of electromagnetic waves of a specific frequency or frequency band. For example, a preliminary metal patch model can be constructed in the software based on the λ calculated by the formula, and the size and shape of the hollow part of the metal patch, the perimeter of the metal patch itself, the line width, shape and other properties can be further adjusted. According to the frequency band results simulated by the software, the characteristics of the entire metal patch can be finally determined.

[0041] In terms of materials, in some embodiments of the present disclosure, the dielectric substrate 21 is made of FR4 (Fiber Reinforced, 4 represents a material grade or classification) material, the metal patch 22 is made of copper, and the metal ground plane 23 is made of copper. Among them, the dielectric substrate of FR4 material can also be called epoxy glass fiber cloth substrate (commonly known as: epoxy board, glass fiber board, fiberboard, FR4), which has strong high temperature resistance, high mechanical strength, good insulation performance, and good corrosion resistance. Copper material has good electrical conductivity, high mechanical strength, good corrosion resistance, and good ductility. Of course, the material can also be flexibly adjusted according to actual needs or budget.

[0042] refer to Figure 4 , which shows a schematic structural plan view of another frequency selective surface unit according to an embodiment of the present disclosure.

[0043] As can be seen from the figure, the metal patch 22 includes a first patch unit 221 and a second patch unit 222. It should be understood that the first patch unit and the second patch unit can be designed according to the above description of the metal patch. For example, the first patch unit 221 is configured as a square (see Figure 5 , Figure 6 ), triangular or circular (see Figure 4), and the second patch unit 222 is arranged in the accommodating space surrounded by the first patch unit 221, so that while realizing the expected reflection of electromagnetic waves in different frequency bands, the overall occupied space of the entire metal patch is kept small, thereby improving the compactness of the metal patch (the frequency selective surface unit can construct more metal patches), and the occupied space of the entire frequency selective surface unit can also be controlled, which is particularly advantageous for electronic devices such as mobile phones and smart glasses where "every inch of land is valuable".

[0044] Thus, by constructing the first patch unit and the second patch unit differently, the entire frequency selective surface can reflect electromagnetic waves of multiple different frequencies or frequency bands, providing a more targeted and comprehensive protection for the camera. Exemplarily, the first patch unit 221 and the second patch unit 222 have different shapes and circumferences and are spaced apart from each other. Specifically, the first patch unit is circular and the second patch unit is square, and the different shapes can avoid the possibility of the first and second patch units affecting each other. Different circumferences are suitable for reflecting multiple different electromagnetic wave frequencies or frequency bands.

[0045] It is also feasible that the first surface of the dielectric substrate 21 includes a plurality of periodically arranged metal patches 22. The periodic arrangement means that the metal patches 22 appear cyclically in accordance with a certain rule. Figure 4 In the example, the metal patches are arranged in a 5×5 square array. On the one hand, the overall square shape can match the square shape of the dielectric substrate, and on the other hand, it can achieve a larger range of electromagnetic wave radiation reflection. It should be known that the arrangement of the metal patches can be adjusted according to actual needs or conditions such as the space that the electronic device can provide, the shape and size of the dielectric substrate, and the shape and size of the parts to be matched. Or in some applications, each group of metal patches can use patch units of different forms, or there are different intervals between metal patches, and so on. Similarly, multiple periodically arranged frequency selective surface units can also be used to achieve the same or similar technical effects, which has a certain flexibility in loading and unloading.

[0046] Combination Figure 5 and Figure 6 ,in, Figure 5 A schematic three-dimensional structure diagram of another frequency selective surface unit according to an embodiment of the present disclosure is shown; and Figure 6 Shown based on Figure 5 Schematic diagram of the floor plan.

[0047] The embodiments of these two figures adopt the Figure 4The first patch unit 221 is configured in a square shape, and the second patch unit is disposed in the accommodation space formed by the square shape of the first patch unit. Therefore, the first patch unit is sometimes referred to as an external metal patch unit, and the second patch unit is sometimes referred to as an internal metal patch unit.

[0048] In addition, combined Figure 5 and Figure 6 It can be clearly seen that the second patch unit 222 is configured as a concave square structure with a concave portion 2221, and the concave portion 2221 is arranged in the center of the side of the concave square structure, and at least two concave portions 2221 are arranged opposite to each other. The design of the concave portion lengthens the perimeter of the second patch unit in a disguised manner (relative to the case of a square), and also reduces the area or floor space of the second patch unit, thereby, while maintaining the compactness of the metal patch, the concave portion is used to change the perimeter, and it is possible to flexibly reflect different frequency bands. And due to the design of this concave portion, the overall structure of the first and second patch units is different, thereby avoiding the risk of mutual coupling or interference between the two. Here, the shape of the concave portion is similar to a three-sided rectangle open on one side. However, although the present disclosure is not explained in detail, concave portions with other shapes, quantities, setting positions or sizes and other characteristics may also be applicable, as long as the purpose of finally reflecting the electromagnetic wave radiation of the specified frequency band can be achieved. For example, the first patch unit 221 may be a square, and accordingly, the concave square structure of the second patch unit 222 may be a concave square structure, that is, the second patch unit is formed by constructing a concave portion on the basis of a square shape.

[0049] refer to Figure 7 , which shows that based on Figure 5 Frequency response curve of a frequency selective surface unit.

[0050] Below is a combination of this figure and Figure 5 and Figure 6 The illustrated embodiment briefly describes the structural design of the metal patch and the frequency band effects that can be achieved.

[0051] Taking the application scenario of a frequency selective surface unit for suppressing the interference of the antenna radiation of an electronic device with the front camera as an example, taking into account the structural characteristics of the back of the front camera, especially the square structure of the back of some cameras, the dielectric substrate and the metal ground plane are exemplarily constructed into a square structure, and the first patch unit is also similarly constructed into a square, while the second patch unit adopts a recessed square structure, which can avoid the risk of mutual coupling or interference between the two, while giving the metal patch the ability to reflect different electromagnetic wave radiation frequency bands, while improving compactness and space utilization.

[0052] First determine the relative dielectric constant of the dielectric substrate. From the perspective of stability, the higher the relative dielectric constant, the better, but a high value also brings high transmission loss. At the same time, the prices of different materials are also different. In this way, according to the design requirements, it is necessary to make a comprehensive consideration of the value of the relative dielectric constant. Here, the dielectric material is selected as FR4, the relative dielectric length constant is 4.3, the length and width of the dielectric substrate are 12mm respectively, and the thickness is 1mm.

[0053] Considering that more and more electronic devices adopt 5G standard and WIFI (Wireless Fidelity), reflection design is carried out for these two frequency bands in this example. Specifically, the frequency range of 5G N78 band is 3.3GHz~3.8GHz, and the frequency range of 5G WIFI band is 5.15GHz~5.85GHz, and the first patch unit and the second patch unit are respectively used for targeted reflection. Accordingly, according to formula 1, in the case of 5G N78 band, the wavelength λ corresponds to 43.84mm-38.07mm, and in the case of 5G WIFI band, the wavelength λ corresponds to 28.09mm-24.73mm. Therefore, the circumference value of the corresponding metal patch can be selected corresponding to the wavelength respectively. Finally, combined with software simulation analysis, the sizes of the first and second metal patches are selected as follows: the side length L1 of the first patch unit is 13mm, and the line width is 0.5mm. The outer perimeter L2 of the second patch unit is 10mm, the line width is 0.5mm, the vertical concave length L3 of the concave portion is 1.5mm, and the lateral outer perimeter length L4 is 4.5mm. The lateral distance L5 between the first patch unit and the second patch unit is 1mm, and the vertical distance L6 is 1mm. Finally, the patch unit is as follows Figure 4 Thus, through this design, the frequency selective surface presents a band-stop filter characteristic. When the resonant unit of the frequency selective surface is in a resonant state, that is, when the incident electromagnetic wave is in the 5G or WIFI frequency band, the electromagnetic wave at the resonant frequency is fully reflected.

[0054] It should also be understood that the first patch unit and the second patch unit may not be coupled, that is, the two do not affect each other when working. However, in some embodiments, the first and second patch units may also be coupled, that is, there is a capacitive effect between the two, thereby, when the first patch unit is working (that is, electromagnetic wave radiation is received), the received energy can be provided to the second patch unit through this effect to activate or enhance the operation of the second patch unit, and vice versa. In general, the reflection effect of the frequency selective surface is better, and the reflection of electromagnetic waves incident at different angles is more comprehensive. The coupling strength between the first and second patch units can be triggered or adjusted by designing the shape and spacing between each other. Since this is not the focus of this proposal, it will not be elaborated here.

[0055] The frequency response curve of the frequency selective surface corresponding to the above scheme is: Figure 7 As shown. The red curve is a schematic diagram of the reflection characteristics of the corresponding frequency band, and the blue curve is a schematic diagram of the transmission characteristics of the corresponding frequency band. The two curves are complementary. From the curve results, in the 5G working frequency band N78 and the WIFI 5G frequency band, the frequency selective surface has good reflection characteristics and a small energy transmission coefficient. This shows that the frequency selective surface can suppress the penetration of the antenna radiation energy of N78 and WIFI 5G.

[0056] As mentioned above, when the antennas around the camera operate in other frequency bands and are affected by the radiation energy of the antenna in this frequency band, the shape and size of the frequency selective surface can be changed accordingly so that the frequency selective surface has a reflective effect on the operating frequency band of the antenna, thereby suppressing the influence of this frequency band on the camera operation.

[0057] It should be understood that all of the above preferred embodiments are illustrative rather than restrictive, and that various modifications or variations made by those skilled in the art to the specific embodiments described above under the concept of the present disclosure should be within the legal protection scope of the present disclosure.

Claims

1. An electronic device, comprising a camera, a frequency selective surface unit and an antenna, wherein the frequency selective surface unit is arranged on an electromagnetic wave radiation path of the antenna toward the camera, and the frequency selective surface unit is used to reflect electromagnetic wave radiation from the antenna at a resonant frequency with the frequency selective surface unit.

2. The electronic device according to claim 1, wherein the frequency selective surface unit comprises a dielectric substrate, a metal patch and a metal ground plane, wherein the metal patch is constructed on a first surface of the dielectric substrate, and the metal ground plane is constructed on a second surface of the dielectric substrate. 3 . The electronic device according to claim 2 , wherein the first surface of the dielectric substrate comprises a plurality of periodically arranged metal patches. 4 . The electronic device according to claim 2 , wherein the perimeter of the metal patch is determined based on a radiation frequency of an electromagnetic wave from the antenna to be reflected, a propagation speed of the electromagnetic wave in the air, and a dielectric constant of the dielectric substrate. 5 . The electronic device according to claim 2 , wherein the dielectric substrate is made of FR4 material, the metal patch is made of copper, and the metal ground plane is made of copper. 6 . The electronic device according to claim 2 , wherein the metal patch comprises a first patch unit and a second patch unit which have different shapes and circumferences from each other and are spaced apart from each other. 7 . The electronic device according to claim 6 , wherein the first patch unit is configured in a square, a triangle or a circle, and the second patch unit is arranged in a receiving space surrounded by the first patch unit. 8 . The electronic device according to claim 7 , wherein the second patch unit is configured as a concave square structure having a concave portion, the concave portion is disposed at the center of a side of the concave square structure, and at least two of the concave portions are disposed opposite to each other. 9 . The electronic device according to claim 8 , wherein the first patch unit is a square, and the concave square structure of the second patch unit is a concave square structure. 10 . The electronic device according to claim 1 , wherein the camera is a front camera, and the frequency selective surface unit is arranged on the back side of the camera.

11. The electronic device according to any one of claims 1 to 9, wherein the camera is located within the interference range of the antenna.

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