CN222365733U - Electronic devices - Google Patents

Abstract

Embodiments of the present disclosure provide an electronic device. The electronic device comprises 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 towards the camera, and the frequency selective surface unit is used for reflecting electromagnetic wave radiation which is from the antenna and is in resonance frequency with the frequency selective surface unit.

Description

Electronic equipment

Technical Field

The disclosure relates to the field of electronic devices, and in particular, to an electronic device capable of suppressing interference of antenna radiation with operation of a camera.

Background

This section is intended to provide background information related to understanding the various techniques described herein. As implied by the headings in this section, this is a discussion of the related art that should not be implied in any way. Accordingly, it should be understood that any statement in this section should be read from this perspective and not as an admission of prior art.

With the development of intelligent terminals in recent years, the mobile phone photographing function is more and more powerful, and the situation that daily consumers use the mobile phone for photographing is more and more. The requirement of ultra wide angle and high pixel size makes the camera larger and larger. Meanwhile, with the development of 5G (5 ^th Generation) system, the number of mobile phone antennas is increased, and the layout of the mobile phone antennas is more compact. Such a requirement inevitably makes the camera periphery layout multiple antennas, and the distance between the camera module and the related parts of the periphery and the antennas is also smaller and smaller. Electromagnetic wave energy generated by radiation during the operation of the antenna can be coupled with peripheral devices to generate coupling current, which can cause obvious influence on the normal operation of the camera module. How to reduce the interference of antenna radiation energy to the camera becomes a technical problem to be solved.

Disclosure of utility model

According to an aspect of the present disclosure, there is provided:

An electronic device comprising a camera, a frequency selective surface unit and an antenna, the frequency selective surface unit being arranged on an electromagnetic wave radiation path of the antenna towards the camera, the frequency selective surface unit being arranged to reflect electromagnetic wave radiation from the antenna at a resonance frequency with the frequency selective surface unit.

According to one embodiment of the present disclosure, the frequency selective surface unit includes a dielectric substrate, a metal patch configured on a first side of the dielectric substrate, and a metal ground plane configured on a second side of the dielectric substrate.

According to one embodiment of the present disclosure, the first side of the dielectric substrate includes a plurality of periodically arranged metal patches.

According to one embodiment of the present disclosure, the perimeter of the metal patch 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.

According to one 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.

According to one embodiment of the present disclosure, the metal patch includes first and second patch units having different shapes, different circumferences, and spaced apart from each other.

According to one embodiment of the present disclosure, the first patch unit is configured in a square, triangle, or circle shape, and the second patch unit is disposed in a receiving space surrounded by the first patch unit.

According to one embodiment of the present disclosure, the second patch unit is configured as a concave square structure provided with concave portions provided at the center of sides thereof, and at least two of the concave portions are provided opposite to each other.

According to one embodiment of the present disclosure, the first patch unit is square, and the concave square structure of the second patch unit is a concave square structure.

According to one embodiment of the disclosure, the camera is a front-facing camera, and the frequency selective surface unit is arranged on the back of the camera.

According to one embodiment of the disclosure, the camera is located within the interference range of the antenna.

Drawings

The above and other features of the present disclosure will become apparent with reference to the drawings, in which,

Fig. 1 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;

Fig. 2 shows a schematic structural perspective view of a frequency selective surface unit according to an embodiment of the present disclosure;

FIG. 3 shows a partially enlarged side view based on FIG. 2;

Fig. 4 shows a schematic structural plan view of another frequency selective surface unit according to an embodiment of the present disclosure;

Fig. 5 shows a schematic structural perspective view of yet another frequency selective surface unit according to an embodiment of the present disclosure;

FIG. 6 shows a schematic plan view based on FIG. 5, and

Fig. 7 shows a frequency response curve based on the frequency selective surface unit of fig. 5.

Detailed Description

It is to be readily understood that, in accordance with the teachings of the present disclosure, those skilled in the art may devise various arrangements and implementations that may be interchanged without departing from the true spirit of the present disclosure. Accordingly, the following detailed description and drawings are merely illustrative of the presently disclosed technology and are not to be considered as an all-or-as-limited or restrictive of the presently disclosed technology.

Terms of orientation such as up, down, left, right, front, rear, front, back, top, bottom, etc. mentioned or possible to be mentioned in the present specification are defined with respect to the configurations shown in the drawings, which are relative concepts, and thus may be changed according to different positions and different use states thereof. These and other directional terms should not be construed as limiting terms. Furthermore, the terms "first," "second," "third," and the like are used for descriptive and distinguishing purposes only and are not to be construed as indicating or implying a relative importance of the corresponding components.

Referring to fig. 1, there is shown 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 the camera of the electronic device seen from the side of the electronic device, i.e. the electronic device is laid flat and the screen is facing downwards.

The present disclosure relates to an electronic device comprising a camera 1, a frequency selective surface unit 2 and an antenna 3, the frequency selective surface unit 2 being arranged on an electromagnetic wave radiation path of the antenna 3 towards the camera 1, the frequency selective surface unit 2 being arranged to reflect electromagnetic wave radiation from the antenna 3 at a resonance frequency with the frequency selective surface unit 2.

An electronic device should be understood in a broad sense, and can cover various devices that perform operations such as information transmission, signal processing, etc. through electronic technology, such as smart phones (including foldable phones), tablet computers, smart headsets (e.g., AR glasses, AR helmets), etc., as long as the electronic device is configured with an antenna and a camera, various technical solutions described in the present disclosure may be used.

It should also be understood that the frequency selective surface (Frequency Selective Surface, FSS) refers to, for example, a one-or two-dimensional periodic structure consisting of metal patches or aperture units arranged on a dielectric substrate, having filter characteristics such as bandpass (aperture-type FSS) or bandstop (patch-type FSS), which are essentially a spatial filter. According to the technical scheme, the frequency selective surface unit is arranged between the antenna and the camera, so that the electromagnetic wave energy generated by radiating the antenna towards the camera when the antenna works is enabled by utilizing the spatial filtering characteristic of the frequency selective surface, the antenna radiation signal is reflected due to the effect of the frequency selective surface, the camera is effectively protected, interference caused by the antenna when the antenna works is avoided, and the camera can work normally.

In addition, the frequency selection surface is set to be used for reflecting mobile phone antenna radiation to prevent the camera from working, the structure or the working principle of the camera or the antenna is not affected, the compatibility and the universality are strong, the whole structure of the electronic equipment is not greatly changed, and the coexistence and the normal working of the camera and the antenna can be ensured in a mode with higher cost performance.

In some embodiments, when the frequency selective surface is irradiated by electromagnetic waves, the frequency selective surface generates induced current accordingly. The frequency selective surface itself does not absorb radio frequency energy, its response characteristics vary with the frequency of electromagnetic wave radiation, being almost completely transparent to incident electromagnetic waves in certain frequency bands, and exhibiting near total reflection characteristics for incident waves in other frequency bands. Thus, the response characteristics to electromagnetic waves can be adjusted with a sense of relief by constructing various features of the frequency selective surface, as will be further explained below.

In order to more specifically shield the antennas near the camera from electromagnetic wave radiation, the antenna 3 may be disposed close to the camera 1, for example, with the camera 1 being located within the interference range of the antenna 3. The interference range of the antenna 3 is understood to be the region in the radiation path of the antenna 3 where the radiation intensity is greater than an intensity threshold value, which can be set on the basis of the interference resistance of the camera 1. This is because the antenna close to the camera has a more direct or greater possibility of interference with the camera, and the electromagnetic wave radiated by the antenna 3 has a stronger intensity at the position of the camera 1, and the electromagnetic wave radiated by it is more likely to affect the camera, so that it can be preferentially considered and processed. Taking the example that the camera 1 is a front-facing camera, the frequency selective surface unit 2 can in this case be arranged, for example, attached to the back of said camera 1, but also integrated with the camera. It should be understood that the back side refers to the side of the camera facing away from the display screen of the electronic device. That is, under such a layout scheme, the frequency selective surface unit is inside the electronic device, is not seen by the user, and can maintain the original design of the electronic device while performing the intended function. In addition, the layout of the back surface can be better aimed at the antenna near the camera, and can be aimed at the area close to the antenna with strong radiation energy field. When the energy radiated by the nearby antenna is coupled to the camera body, the coupled energy of the frequency band of the antenna is reflected due to the effect of the frequency selection surface, so that the radiated energy of the antenna cannot enter the camera, and the camera cannot be interfered. In addition, generally, the arrangement space or area of the back of the camera is larger, so that the layout design can better utilize the arrangement space of the camera, can also play a relatively targeted protection role, can maximally prevent the energy radiated by the antenna from entering the inside of the camera, does not influence the appearance and the performance of the mobile phone antenna.

Referring to fig. 2 and 3, wherein fig. 2 shows a schematic structural perspective view of a frequency selective surface unit according to an embodiment of the present disclosure, and fig. 3 shows a partially enlarged side view based on fig. 2 for illustrating a relative positional relationship of a dielectric substrate, a metal patch, and a metal ground plane.

The frequency selective surface unit 2 comprises a dielectric substrate 21, a metal patch 22 and a metal ground plane 23, the metal patch 22 being configured on a first side of the dielectric substrate 21, the metal ground plane 23 being configured on a second side of the dielectric substrate 21.

Here, as seen from fig. 2, the first surface of the dielectric substrate faces outward from the paper surface, and the second surface of the dielectric substrate faces inward from the paper surface. The dielectric substrate and the metal ground plane are exemplarily configured as a cuboid, but a cylinder, a prism, an irregular shape, etc. can be adopted, and flexible adjustment can be performed according to practical situations or requirements, such as a receiving space provided by the electronic device for the frequency selective surface, a shape of a part (camera) to be matched, or a design shape of the metal patch. Wherein "ground" of the metal ground plane refers to the zero potential end. In this example, the metal patch is configured as a hollowed rectangle, and may also be, for example, a hollowed circle, triangle, trapezoid, mixed shape, irregular shape, or non-closed shape. The shape, size, etc. characteristics of the metal patch can be adjusted according to the electromagnetic wave radiation frequency to be aimed at, as will be explained further below. In addition, the metal patch can be constructed on the dielectric substrate in an etching mode, so that the processing precision is high, the processing of complex shapes can be realized, the advantages of mass production are achieved, and the application range is wide.

In terms of sizing, it is exemplified that the metal patch 22 circumference is configured to be determined based on the antenna electromagnetic wave radiation frequency to be reflected, the propagation speed of electromagnetic waves in air, and the dielectric constant of the dielectric substrate 21. Where perimeter is the amount describing the length of a shape or edge of an object, here the length of a perimeter of the structure formed by the metal patch, the perimeter of the polygon is equal to the sum of all sides of the pattern. For example, the perimeter of a circular structure is 2ρr (where r is the radius, and ρ is the perimeter ratio), the perimeter of a triangle is the sum of the side lengths of the three sides of the triangle, and the perimeter of a quadrilateral is the sum of the side lengths of the quadrilateral.

The technical scheme is based on a formula I shown as follows:

where λ is the wavelength in meters at a given medium, C ₀ is the propagation velocity of electromagnetic waves in free space (air) about 3×10 ⁸ m/s, f is the frequency of the waves in hertz, ε _γ is the relative permittivity of the medium substrate.

From this, it can be seen that λ can be obtained by selecting a material (the material determines the relative permittivity) of the dielectric substrate when the frequency and propagation speed of the electromagnetic wave are known. The circumference of the metal patch can be determined from the value of lambda. In addition, considering that the side length of the metal patch has a certain line width in practical use, the circumference may be understood to mean the circumference of the outer circumference of the side length. Numerical examples will be specifically given below. It should be appreciated that different perimeter dimensions correspond to different frequency characteristics. A certain accurate size corresponds to a certain accurate frequency point, and frequency bands near the frequency point have similar characteristics, so that a value of one circumference point can correspond to a section of frequency, and an expected effect can be obtained. The formula can be used for initially referencing the size design of the metal patch, and final parameter values can be further determined by an equivalent circuit model method or software numerical simulation analysis and the like on the basis of the formula so as to reflect electromagnetic waves with specific frequencies or frequency bands. For example, a preliminary metal patch model can be constructed in software based on λ calculated according to the formula, and the size and shape of the hollowed-out part of the metal patch, the perimeter, line width, shape and other attributes of the metal patch can be further adjusted, and each characteristic of the whole metal patch can be finally determined according to the frequency band result simulated by the software.

In terms of materials, in some embodiments of the present disclosure, the dielectric substrate 21 is made of FR4 (Fiber Reinforced, 4 representing a class or class of materials) material, the metal patch 22 is made of copper, and the metal ground plane 23 is made of copper. The dielectric substrate made of FR4 material can also be called an epoxy glass fiber cloth substrate (commonly called as epoxy board, glass fiber board, fiber board and FR 4), and has strong high-temperature resistance, high mechanical strength, good insulating property and good corrosion resistance. The copper material has good conductivity, high mechanical strength, good corrosion resistance and good ductility. Of course, flexibility adjustment of the material can also be made according to actual needs or budgets.

Referring to fig. 4, a structural plan view of another frequency selective surface unit according to an embodiment of the present disclosure is shown.

As can be seen from this figure, the metal patch 22 comprises a first patch unit 221 and a second patch unit 222. It should be appreciated that the first patch unit and the second patch unit can be designed as described above for the metal patch. For example, the first patch unit 221 is configured in a square shape (see fig. 5, 6), a triangle shape, or a circular shape (see fig. 4), and the second patch unit 222 is disposed in the accommodation space enclosed by the first patch unit 221, so that the overall occupation space of the entire metal patch can be kept small while achieving the desired reflection of electromagnetic waves of different frequency bands, the compactness of the metal patch is improved (the frequency selective surface unit can configure more metal patches), and the occupation space of the entire frequency selective surface unit can be controlled thereby, which is advantageous especially for electronic devices such as mobile phones, smart glasses, etc.

Therefore, the first patch unit and the second patch unit are differently constructed, so that the whole frequency selection surface can reflect electromagnetic waves with various different frequencies or frequency bands, and the camera is more targeted and comprehensively protected. Illustratively, the first patch unit 221 and the second patch unit 222 are shaped differently from each other, have different circumferences, and are spaced apart from each other. In particular, the first patch unit is circular and the second patch unit is square, and the possibility of the first and second patch units affecting each other can be avoided by different shapes. Different perimeters are suitable for reflecting a plurality of different electromagnetic wave frequencies or bands.

It is also possible that the first side of the dielectric substrate 21 comprises a plurality of periodically arranged metal patches 22. The periodic arrangement is that the circulation appears periodically according to a certain rule. In the example of fig. 4, the metal patches are arranged in a 5×5 square array, so that, on one hand, the square overall shape can be matched with the square shape of the dielectric substrate, and on the other hand, a wide-range electromagnetic wave radiation reflection effect can be realized. It should be appreciated that the arrangement manner of the metal patches can be adjusted according to actual requirements or conditions such as the space that can be provided by the electronic device, the shape and size of the dielectric substrate, the shape and size of the components to be matched, and the like. Alternatively, in some applications, each set of metal patches may take the form of a different patch unit, or may have different spacing between metal patches, etc. Similarly, a plurality of periodically arranged frequency selective surface units may be employed to achieve the same or similar technical effect with some flexibility in handling.

In connection with fig. 5 and 6, fig. 5 shows a schematic structural perspective view of a further frequency selective surface unit according to an embodiment of the present disclosure, and fig. 6 shows a schematic plan view based on fig. 5.

The two-figure embodiment employs a metallic patch of a different construction than the embodiment of figure 4. The first patch unit 221 is configured as a square, and the second patch unit is disposed in an accommodating space formed by the square of the first patch unit. Thus, the first patch unit is sometimes referred to as an outer metal patch unit and the second patch unit is sometimes referred to as an inner metal patch unit.

In addition to this, as can be clearly seen in conjunction with fig. 5 and 6, the second patch unit 222 is configured in a recessed square structure provided with recessed portions 2221, the recessed portions 2221 are provided in the center of sides of the recessed square structure, and at least two recessed portions 2221 are provided in opposition. The design of the concave part lengthens the perimeter of the second patch unit in a variable manner (compared with the square situation), and reduces the area or the occupied space of the second patch unit, so that the reflection can be flexibly carried out for different frequency bands by changing the perimeter through the concave part under the condition that the compactness of the metal patch is maintained. And due to the design of such recesses the overall structure of the first and second patch units is different, whereby the risk of coupling or interference of the two with each other can also be avoided. Here, the shape of the concave portion is similar to a three-sided rectangle that is open at one side. However, although not explained in detail in this disclosure, the concave portions having other shapes, numbers, arrangement positions, or sizes, etc. of the features may also be applicable as long as the purpose of finally reflecting electromagnetic wave radiation of a specified frequency band can be achieved. For example, the first patch unit 221 may be 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 configuring the concave portion on the basis of the square shape.

Referring to fig. 7, a frequency response curve based on the frequency selective surface unit of fig. 5 is shown.

The structural design of the metal patch and the frequency band effect that can be achieved will be briefly described below in connection with the embodiments shown in this figure and fig. 5 and 6.

Taking an application scenario that the frequency selective surface unit is used for inhibiting the interference of the antenna radiation of the electronic equipment to the front camera as an example, considering the structural characteristics of the back surfaces of the front cameras, particularly, the back surfaces of some cameras are in square structures, the dielectric substrate and the metal ground plane are exemplarily constructed into square structures, the first patch unit is also similarly constructed into square, the second patch unit adopts a concave square structure, the risk of mutual coupling or interference of the two can be avoided, and the compactness and the space utilization rate are improved while the metal patch is endowed with the capability of reflecting against different electromagnetic wave radiation frequency bands.

The relative permittivity of the dielectric substrate is first determined. The higher the value of the relative dielectric constant, the better from the viewpoint of stability, but a high value also brings about high transmission loss. Meanwhile, the prices of different materials are different. Thus, the relative dielectric constant is comprehensively considered according to design requirements. Here, the dielectric material was selected to be FR4, the relative dielectric length constant was 4.3, the length and width of the dielectric substrate were 12mm, respectively, and the thickness was 1mm.

Considering that more and more electronic devices adopting 5G system and WIFI (WIRELESS FIDELITY, wireless fidelity technology) are adopted, reflection designs are performed for the two frequency bands in this example. Specifically, the frequency range of the 5G N78 frequency band is 3.3GHz~3.8GHz,5G WIFI GHz-5.85 GHz, and the first patch unit and the second patch unit are adopted to conduct targeted reflection respectively. Correspondingly, according to the first calculation of the formula, the wavelength lambda corresponds to 43.84mm-38.07mm in the case of the 5G N78 frequency band, and corresponds to 28.09mm-24.73mm in the case of the 5G WIFI frequency band. Thus, the circumferential length value of the corresponding metal patch can be selected in accordance with the wavelength. Finally, in combination with software simulation analysis, the dimensions of the first and second metal patches were selected such that the side length L1 of the first patch unit was 13mm and the line width was 0.5mm. The peripheral length L2 of the second patch unit is 10mm, the line width is 0.5mm, the vertical concave length L3 of the concave part is 1.5mm, and the horizontal peripheral length L4 is 4.5mm. The first patch unit and the second patch unit have a lateral distance L5 of 1mm and a vertical distance L6 of 1mm. Finally, the patch units are periodically arranged as shown in fig. 4, so as to obtain a larger reflection range. Thus, with this design, the frequency selective surface exhibits a band-stop filter characteristic, and when the resonance unit of the frequency selective surface is in a resonance state, that is, when an incident electromagnetic wave is in the 5G or WIFI frequency band, the electromagnetic wave at the resonance frequency is totally reflected.

It should also be understood that the first patch unit and the second patch unit may not be coupled, i.e. in operation they do not interact with each other. However, in some embodiments, the first and second patch units may also be coupled, i.e. there is a capacitive effect, whereby the received energy may be provided to the second patch unit by the effect when the first patch unit is in operation (i.e. electromagnetic radiation is received), activating or enhancing 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 from 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 the distance between the two patch units. Since this is not the focus of this proposal, it will not be described in detail here.

The frequency response curve of the frequency selective surface corresponding to the above scheme is shown in fig. 7. The red curve is a reflection characteristic diagram of the corresponding frequency band, the blue curve is a transmission characteristic diagram of the corresponding frequency band, and the two curves are complementary. From the curve results, the frequency selection surface has good reflection characteristics in the 5G working frequency band N78 and the WIFI 5G frequency band, and the energy transmission coefficient is small. This indicates that the frequency selective surface is capable of inhibiting penetration of the antenna radiation energy of N78 and WIFI 5G.

As described above, when the antennas around the camera operate in other frequency bands and are affected by the radiation energy of the antennas in the frequency bands, the shape and size of the frequency selection surface can be changed accordingly, so that the frequency selection surface has a reflection effect on the operating frequency band of the antenna, thereby inhibiting the influence of the frequency band on the operation of the camera.

It should be understood that all of the above preferred embodiments are exemplary and not limiting, and that various modifications or variations to the specific embodiments described above, which would be within the spirit of the present disclosure, would be within the legal scope of the present disclosure by those skilled in the art.

Claims (11)

1. An electronic device comprising a camera, a frequency selective surface unit and an antenna, the frequency selective surface unit being arranged on an electromagnetic wave radiation path of the antenna towards the camera, the frequency selective surface unit being arranged to reflect electromagnetic wave radiation from the antenna at a resonance frequency with the frequency selective surface unit.

2. The electronic device of claim 1, the frequency selective surface unit comprising a dielectric substrate, a metal patch configured on a first side of the dielectric substrate, and a metal ground plane configured on a second side of the dielectric substrate.

3. The electronic device of claim 2, the first side of the dielectric substrate comprising a plurality of periodically arranged metal patches.

4. The electronic device of claim 2, the metal patch perimeter configured to be determined based on an antenna electromagnetic wave radiation frequency to be reflected, a propagation velocity of an electromagnetic wave in air, and a dielectric constant of the dielectric substrate.

5. The electronic device of claim 2, the dielectric substrate being made of FR4 material, the metal patch being made of copper, the metal ground plane being made of copper.

6. The electronic device of claim 2, the metal patch comprising first and second patch units that are different in shape, different in perimeter, and spaced apart from each other.

7. The electronic device of claim 6, the first patch unit being configured as a square, triangle, or circle, the second patch unit being disposed within a receiving space enclosed by the first patch unit.

8. The electronic device according to claim 7, wherein the second patch unit is configured as a recessed square structure provided with recessed portions provided in a side center of the recessed square structure, and at least two of the recessed portions are provided opposite to each other.

9. The electronic device of claim 8, the first patch unit being square and the recessed square structure of the second patch unit being a recessed square structure.

10. The electronic device of any of claims 1-9, the camera being a front-facing camera, the frequency selective surface unit being arranged on a back side of the camera.

11. The electronic device of any of claims 1-9, the camera being located within an interference range of the antenna.