Artificial magnetic conductor and wearable device

Abstract

The utility model discloses an artificial magnetic conductor and wearable equipment. The artificial magnetic conductor comprises a plurality of sub artificial magnetic conductors; each sub artificial magnetic conductor comprises a substrate, a radiation layer located on one side of the substrate and a grounding layer located on the side, away from the radiation layer, of the substrate. The radiation layer comprises a first branch part, a second branch part and a plurality of third branch parts; the second branch part surrounds the first branch part, and a gap exists between the first branch part and the second branch part; and the third branch part is distributed in the gap and is respectively connected with the first branch part and the second branch part. According to the utility model, by adopting the artificial magnetic conductor, the backward radiation of the antenna loaded with the artificial magnetic conductor can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of artificial magnetic conductor especially relates to a kind of artificial magnetic conductor and wearable equipment. BACKGROUND

[0002] With the rapid development of Internet of Things and wireless personal area network in modern wireless communication system, wearable equipment as the intelligent terminal of wireless communication system plays a vital role in the communication system with human body as the center.

[0003] The antenna integrated in wearable equipment as the medium for receiving and transmitting signals and realizing information interaction should play a role as much as possible to meet the communication requirements with human body as the center. For example, in a wireless body area network system, users can perform health detection through the wearable equipment carried and send health monitoring data (such as body temperature, blood sugar, blood pressure, etc.) to the intelligent platform using the antenna in the wearable equipment. The intelligent platform can then feed back the corresponding information according to the received health monitoring data, and the feedback information can be received by the wearable equipment through the antenna, thereby realizing self-health management of the user.

[0004] Considering that wearable equipment needs to be used close to the human body, and the antenna in the wearable equipment will inevitably generate electromagnetic radiation harmful to human health when working, how to reduce the back radiation of the antenna when working has become the main research direction. SUMMARY

[0005] The utility model provides a kind of artificial magnetic conductor and wearable equipment to provide a kind of artificial magnetic conductor capable of reducing the back radiation of antenna.

[0006] In the first aspect, the utility model embodiment provides a kind of artificial magnetic conductor, including multiple sub artificial magnetic conductors;

[0007] The sub artificial magnetic conductor includes a substrate, a radiation layer on one side of the substrate, and a ground layer on the side of the substrate away from the radiation layer;

[0008] The radiation layer includes a first part, a second part and a plurality of third parts;The second part surrounds the first part, and there is a gap between the first part and the second part;The third part is distributed in the gap and is connected with the first part and the second part respectively.

[0009] Optionally, the inner edge contour of the second part is a polygon;

[0010] The geometric center of the inner edge contour of the second part coincides with the geometric center of the first part.

[0011] Optionally, the plurality of third subparts include a first patch, a second patch, a third patch, and a fourth patch.

[0012] The first patch, the second patch, the third patch, and the fourth patch are evenly distributed around the geometric center of the first subpart.

[0013] Optionally, the equivalent circuit of the artificial magnetic conductor includes a first end, a second end, a first capacitor, a second capacitor, a first inductor, a second inductor, a third inductor, and a fourth inductor.

[0014] The first end is electrically connected to one end of the first inductor, the other end of the first inductor is electrically connected to one end of the second inductor, the third inductor, and the fourth inductor respectively, the other end of the second inductor is electrically connected to one end of the first capacitor, the other end of the first capacitor is electrically connected to the second end, the other end of the third inductor is electrically connected to one end of the second capacitor, the other end of the second capacitor is electrically connected to the second end, and the other end of the fourth inductor is electrically connected to the second end.

[0015] Optionally, the length of the substrate along the first direction is a x λ, the length of the substrate along the second direction is b x λ, and the length of the substrate along the third direction is c x λ, where λ represents the wavelength of an electromagnetic wave satisfying a predetermined frequency in free space, a satisfies 0.15 ≤ a ≤ 0.3, b satisfies 0.15 ≤ b ≤ 0.3, and c satisfies 0.003 ≤ c ≤ 0.005.

[0016] The first direction, the second direction, and the third direction intersect with each other.

[0017] Optionally, the operating frequency of the sub-artificial magnetic conductor includes a first resonant frequency and a second resonant frequency, and the first resonant frequency is less than the second resonant frequency.

[0018] The outer contour size of the first subpart is negatively related to the first resonant frequency.

[0019] The size of the second subpart is positively related to the first resonant frequency, and the size of the second subpart is negatively related to the second resonant frequency.

[0020] Optionally, the dielectric constant C1 of the substrate satisfies 3.43 ≤ C1 ≤ 3.66.

[0021] The thickness M1 of the substrate satisfies 0.1 mm ≤ M1 ≤ 1.52 mm.

[0022] The thickness M2 of the radiation layer satisfies 0.018 mm ≤ M2 ≤ 0.035 mm.

[0023] The thickness M3 of the ground layer satisfies 0.018 mm ≤ M3 ≤ 0.035 mm.

[0024] Optionally, the substrates of the plurality of sub-artificial magnetic conductors are arranged in the same layer.

[0025] Optionally, the radiation layers of the plurality of sub-artificial magnetic conductors are arranged in the same layer.

[0026] Optionally, the ground layers of the plurality of sub-artificial magnetic conductors are arranged in the same layer.

[0027] Optionally, the ground layer covers the substrate.

[0028] In a second aspect, the utility model provides a wearable device, including the artificial magnetic conductor and the antenna as described in the first aspect.

[0029] The technical scheme of the utility model provides an artificial magnetic conductor including a plurality of sub-artificial magnetic conductors, the sub-artificial magnetic conductor includes a substrate, a radiation layer on one side of the substrate, and a ground layer on the side of the substrate away from the radiation layer, the radiation layer includes a first part, a second part, and a plurality of third parts, the second part surrounds the first part, there is a gap between the first part and the second part, the third parts are distributed in the gap and are connected to the artificial magnetic conductor with the first part and the second part respectively, and the back radiation of an antenna loaded with the artificial magnetic conductor can be reduced by using the artificial magnetic conductor.

[0030] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, and is not used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed in the embodiment description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creative labor.

[0032] Figure 1 A structural schematic diagram of an artificial magnetic conductor provided by the embodiments of the utility model is shown in the figure.

[0033] Figure 2 A structural schematic diagram of another artificial magnetic conductor provided by the embodiments of the utility model is shown in the figure.

[0034] Figure 3 A structural schematic diagram of a sub-artificial magnetic conductor provided by the embodiments of the utility model is shown in the figure.

[0035] Figure 4A schematic diagram of another sub-artificial magnetic conductor provided in an embodiment of this utility model;

[0036] Figure 5 for Figure 3 Schematic diagram of the phase reflection and total internal reflection characteristics of the provided artificial magnetic conductor;

[0037] Figure 6 A comparison diagram of the far-field radiation at 2.45 GHz between a dual-band antenna loaded with the artificial magnetic conductor provided in this embodiment and a dual-band antenna without the artificial magnetic conductor provided in this embodiment.

[0038] Figure 7 A comparison diagram of the far-field radiation at 5.8 GHz between a dual-band antenna loaded with the artificial magnetic conductor provided in this embodiment and a dual-band antenna without the artificial magnetic conductor provided in this embodiment.

[0039] Figure 8 A schematic diagram showing the change in reflection coefficient of a dual-frequency antenna with an artificial magnetic conductor provided in this embodiment of the invention when the artificial magnetic conductor is bent along a first direction.

[0040] Figure 9 A schematic diagram showing the change in reflection coefficient of a dual-frequency antenna with an artificial magnetic conductor provided in this embodiment of the invention when the artificial magnetic conductor is bent along the second direction.

[0041] Figure 10 for Figure 3 The equivalent circuit diagram of the provided artificial magnetic conductor;

[0042] Figure 11 for Figure 3 The provided artificial magnetic conductor and Figure 6 A comparison diagram of the phase reflection characteristics of the provided equivalent circuit diagram;

[0043] Figure 12 This is a schematic diagram of the structure of a wearable device provided in an embodiment of the present utility model. Detailed Implementation

[0044] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices. The terms "up", "down", "left", "right", etc. indicate the orientation or positional relationship shown in the drawings, and are only used to illustrate the relative positional relationship between the components or parts, and do not particularly limit the specific installation orientation of the components or parts.

[0046] Figure 1 A structure diagram of an artificial magnetic conductor provided by the embodiment of the present application, Figure 2 A structure diagram of another artificial magnetic conductor provided by the embodiment of the present application, Figure 3 A structure diagram of a sub-artificial magnetic conductor provided by the embodiment of the present application, with reference to Figure 1 、 Figure 2 and Figure 3 The artificial magnetic conductor 100 in the embodiment of the present application includes a plurality of sub-artificial magnetic conductors 10. The sub-artificial magnetic conductor 10 includes a substrate 11, a radiation layer 12 located on one side of the substrate 11, and a ground layer 13 located on the side of the substrate 11 away from the radiation layer 12. The radiation layer 12 includes a first part 121, a second part 122, and a plurality of third parts 123. The second part 122 surrounds the first part 121, and there is a gap 124 between the first part 121 and the second part 122. The third part 123 is distributed in the gap 124 and is connected to the first part 121 and the second part 122, respectively.

[0047] For example, the artificial magnetic conductor 100 can include (m x n) arrayed sub-artificial magnetic conductors 10, where (m x n) > 2. As a feasible implementation, when the material of the substrate 11 in the embodiment of the present application is Rogers RO4350B, the dielectric constant C1 of the substrate 11 in the embodiment of the present application can satisfy 3.43 < C1 < 3.66, and the thickness M1 of the substrate 11 can satisfy 0.1 mm < M1 < 1.52 mm. The thickness M2 of the radiation layer 12 satisfies 0.018 mm < M2 < 0.035 mm. The thickness M3 of the ground layer 13 satisfies 0.018 mm < M3 < 0.035 mm.

[0048] For example, in this embodiment of the present invention, the substrate 11 can be made of Rogers RO4350B with a dielectric constant of 3.6, and the radiating layer 12 and the ground layer 13 can be made of copper foil with a thickness of 0.508 mm and a thickness of 0.035 mm. It should be noted that the dielectric constant and thickness range of the substrate 11 will be different depending on the material used. In this embodiment of the present invention, the substrate 11 can also be made of a material with a dielectric constant of 2.2. This embodiment of the present invention does not limit the materials used for the substrate 11, the radiating layer 12 and the ground layer 13. Those skilled in the art can set them according to actual needs.

[0049] When the artificial magnetic conductor 10 only has such Figure 3 When the second portion 122 is shown, the sub-artificial magnetic conductor 10 will only form a low resonant frequency during operation, and the reflection coefficient at this low resonant frequency is -12.27 dB. When the sub-artificial magnetic conductor 10 only has... Figure 3 When the first portion 121 is shown, the sub-artificial magnetic conductor 10 will only form a higher resonant frequency during operation, and the reflection coefficient at this higher resonant frequency is -1.7dB. When the sub-artificial magnetic conductor 10 as... Figure 3 As shown, the sub-artificial magnetic conductor 10 includes a first portion 121, a second portion 122, and four third portions 123. A gap 124 exists between the first portion 121 and the second portion 122, and the four third portions 123 are distributed within the gap 124. When the sub-artificial magnetic conductor 10 is positioned within this gap, it can be equivalent to an LC resonant circuit. During operation, it can form two resonant frequencies, one high and one low. Its reflection coefficient at the lower resonant frequency is -5.1 dB, and its reflection coefficient at the higher resonant frequency is -3.06 dB. Therefore, this embodiment of the invention effectively reduces the back radiation of the antenna loaded with the artificial magnetic conductor 100 by employing the aforementioned artificial magnetic conductor 100.

[0050] It should be noted that the lower resonant frequency mentioned above can be 2.45 GHz, and the higher resonant frequency mentioned above can be 5.8 GHz.

[0051] As one possible implementation method, refer to Figure 3 The inner contour of the second part 122 shown is a polygon, and the geometric center of the inner contour of the second part 122 coincides with the geometric center of the first part 121.

[0052] For example, when the inner contour of the second portion 122 is as follows Figure 3 The regular octagon shown has its first part 121 as follows: Figure 3The geometric center of the inner edge contour of the second subpart 122 (i.e. the center of the inscribed circle of the regular octagon) coincides with the geometric center of the first subpart 121 (i.e. the center of the circular patch).

[0053] It should be noted that the inner edge contour of the second subpart 122 can be a polygon such as a quadrilateral, a hexagon, etc., and the present embodiment is not limited in this regard. Figure 3 The octagon shown can also be a quadrilateral, a hexagon, etc., and the present embodiment is not limited in this regard.

[0054] Figure 4 Another structure of a sub-artificial magnetic conductor provided by the present embodiment is shown in FIG. 12, and reference is made to FIG. 1 and FIG. 2. Figure 3 and Figure 4 The plurality of third subparts 123 include a first patch 1231, a second patch 1232, a third patch 1233, and a fourth patch 1234. The first patch 1231, the second patch 1232, the third patch 1233, and the fourth patch 1234 are uniformly distributed around the geometric center of the first subpart 121.

[0055] For example, as shown in FIG. 11, Figure 3 The first patch 1231 is located at the upper center point of the gap 124, the second patch 1232 is located at the right center point of the gap 124, the third patch 1233 is located at the lower center point of the gap 124, and the fourth patch 1234 is located at the left center point of the gap 124. The straight line passing through the center of the first patch 1231 and the center of the third patch 1233 is perpendicular to the straight line passing through the center of the second patch 1232 and the center of the fourth patch 1234, and both straight lines pass through the geometric center of the first subpart 121 (i.e. the center of the circular patch).

[0056] Figure 4 As shown in FIG. 12, the first patch 1231 is located at the upper left corner of the gap 124, the second patch 1232 is located at the upper right corner of the gap 124, the third patch 1233 is located at the lower right corner of the gap 124, and the fourth patch 1234 is located at the lower left corner of the gap 124, and are uniformly distributed at the upper left corner, the upper right corner, the lower left corner, and the lower right corner of the gap 124. Similarly, the straight line passing through the center of the first patch 1231 and the center of the third patch 1233 is perpendicular to the straight line passing through the center of the second patch 1232 and the center of the fourth patch 1234, and both straight lines pass through the geometric center of the first subpart 121 (i.e. the center of the circular patch).

[0057] It should be noted that the present embodiment is not limited in the specific positions of the first patch 1231, the second patch 1232, the third patch 1233, and the fourth patch 1234 uniformly distributed around the geometric center of the first subpart 121, which can be the distribution positions shown in FIG. 11, Figure 3 and Figure 4 and can also be other distribution positions that can be thought of, which can be set by the person skilled in the art according to the actual situation.

[0058] Reference Figure 1 And Figure 2 , the length of the substrate 11 in the sub artificial magnetic conductor 10 along the first direction X is a*lambda, the length along the second direction Y is b*lambda, and the length along the third direction Z is c*lambda, wherein lambda represents the wavelength of the electromagnetic wave satisfying the preset frequency in the free space, a satisfies 0.15<=a<=0.3, b satisfies 0.15<=b<=0.3, and c satisfies 0.003<=c<=0.005. The first direction X, the second direction Y and the third direction Z intersect with each other.

[0059] Exemplarily, the first direction X, the second direction Y and the third direction Z can be perpendicular to each other as shown in Figure 1 And Figure 2 In the embodiment of the utility model, the length of the sub artificial magnetic conductor 10 along the first direction X can be 0.2lambda, the length of the sub artificial magnetic conductor 10 along the second direction Y can be 0.2lambda, and the length of the sub artificial magnetic conductor 10 along the third direction Z can be 0.004lambda, and lambda can be the wavelength of 2.45GHz electromagnetic wave in the free space (about 122mm), compared with the size of the existing sub artificial magnetic conductor 10, the size of the sub artificial magnetic conductor 10 in the embodiment of the utility model is smaller, which is beneficial to realize the miniaturization of wearable equipment.

[0060] As a feasible implementation manner, referring to Figure 1 And Figure 2 , the substrates 11 of the plurality of sub artificial magnetic conductors 10 are arranged in the same layer. The radiation layers 12 of the plurality of sub artificial magnetic conductors 10 are arranged in the same layer. The ground layers 13 of the plurality of sub artificial magnetic conductors 10 are arranged in the same layer.

[0061] Exemplarily, the substrates 11 of the plurality of sub artificial magnetic conductors 10 can be prepared in the same preparation process by arranging the substrates 11 of the plurality of sub artificial magnetic conductors 10 in the same layer. The radiation layers 12 of the plurality of sub artificial magnetic conductors 10 can be prepared in the same preparation process by arranging the radiation layers 12 of the plurality of sub artificial magnetic conductors 10 in the same layer, and the ground layers 13 of the plurality of sub artificial magnetic conductors 10 can be prepared in the same preparation process by arranging the ground layers 13 of the plurality of sub artificial magnetic conductors 10 in the same layer. Therefore, by arranging the substrates 11 of the plurality of sub artificial magnetic conductors 10 in the same layer, the radiation layers 12 of the plurality of sub artificial magnetic conductors 10 in the same layer and the ground layers 13 of the plurality of sub artificial magnetic conductors 10 in the same layer, it is beneficial to improve the preparation efficiency of the artificial magnetic conductor 100 and reduce the cost.

[0062] As a feasible implementation manner, referring to Figure 1 , the ground layer 13 in the embodiment of the utility model covers the substrate 11.

[0063] By setting the ground layer 13 to cover the substrate 11, the part of the electromagnetic wave can be avoided to directly pass through the substrate 11 to reach the human body, and the back radiation of the antenna loaded with the artificial magnetic conductor 100 can be reduced.

[0064] The working frequency of the sub-artificial magnetic conductor 10 in the embodiment of the utility model includes the first resonant frequency and the second resonant frequency, and the first resonant frequency is less than the second resonant frequency. The outer contour size of the first part 121 is negatively correlated with the first resonant frequency. The size of the second part 122 is positively correlated with the first resonant frequency, and the size of the second part 122 is negatively correlated with the second resonant frequency.

[0065] The artificial magnetic conductor 100 in the embodiment of the utility model can be loaded into the dual-frequency antenna with 2.45GHz and 5.8GHz dual bands. In order to reduce the back radiation of the dual-frequency antenna at the working frequency band, the first resonant frequency in the working frequency of the sub-artificial magnetic conductor 10 can be set as 2.45GHz, and the second resonant frequency can be set as 5.8GHz. Taking the outer contour of the first part 121 as a square and the second part 122 as a circular patch as an example, specifically, when the length of the outer contour of the first part 121 changes from 22.2mm to 24.2mm, the lower first resonant frequency can be lowered from 2.60GHz to 2.45GHz, and the higher second resonant frequency almost does not change. When the radius of the second part 122 (i.e. the circular patch) changes from 7.2mm to 8.2mm, the lower first resonant frequency can be raised from 2.34GHz to 2.45GHz, and the higher second resonant frequency can be lowered from 6.27GHz to 5.80GHz. Therefore, it can be understood that the person skilled in the art can determine the resonant frequency of the sub-artificial magnetic conductor 10 according to the working frequency of the antenna to be loaded with the artificial magnetic conductor 100, and adjust the outer contour size of the first part 121 and the size of the second part 122 to make the sub-artificial magnetic conductor 10 reach the determined resonant frequency, and then realize the in-phase reflection of the incident wave at the resonant frequency, so as to ensure that the artificial magnetic conductor 100 can reduce the back radiation of the antenna loaded with the artificial magnetic conductor 100 at the working frequency band thereof.

[0066] Figure 5 For Figure 3 The provided phase reflection characteristic and total reflection characteristic diagram of the sub-artificial magnetic conductor, wherein S1 represents Figure 3 The phase reflection characteristic curve of the sub-artificial magnetic conductor 10 shown in the figure, S2 represents Figure 3 The total reflection characteristic curve of the sub-artificial magnetic conductor 10 shown in the figure, and the reference Figure 3As can be known from S2 in the figure, the reflection coefficient of the sub artificial magnetic conductor 10 at the first resonant frequency (2.45 GHz) can be -5.1 dB, the reflection coefficient at the second resonant frequency (5.8 GHz) can be -3.06 dB, the incident wave can be reflected in phase at the resonant frequency, and the back radiation of the antenna loaded with the artificial magnetic conductor 100 can be effectively reduced.

[0067] Figure 6 In order to compare the far field radiation of the dual-frequency antenna loaded with the artificial magnetic conductor provided in the embodiment of the utility model with the dual-frequency antenna not loaded with the artificial magnetic conductor provided in the embodiment of the utility model at 2.45 GHz, S3 represents the far field radiation curve of the dual-frequency antenna not loaded with the artificial magnetic conductor 100 at 2.45 GHz, S4 represents the far field radiation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 at 2.45 GHz, and reference is made to the figure. Figure 6 As can be known from S4 in the figure, the difference between the front lobe gain and the back lobe gain at 2.45 GHz is greater than 10 dBi, which indicates that the artificial magnetic conductor 100 in the embodiment of the utility model can play a good reflection role and reduce back radiation.

[0068] Figure 7 In order to compare the far field radiation of the dual-frequency antenna loaded with the artificial magnetic conductor provided in the embodiment of the utility model with the dual-frequency antenna not loaded with the artificial magnetic conductor provided in the embodiment of the utility model at 5.8 GHz, S5 represents the far field radiation curve of the dual-frequency antenna not loaded with the artificial magnetic conductor 100 at 5.8 GHz, and S6 represents the far field radiation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 at 5.8 GHz, and reference is made to the figure. Figure 7 As can be known from S6 in the figure, the difference between the front lobe gain and the back lobe gain at 5.8 GHz is greater than 10 dBi, which indicates that the artificial magnetic conductor 100 in the embodiment of the utility model can play a good reflection role and reduce back radiation.

[0069] Table 1

[0070]

[0071] Table 1 shows the influence of the artificial magnetic conductor 100 on the actual gain of the dual-band antenna. After the artificial magnetic conductor 100 is loaded, the gain of the dual-frequency antenna at 2.45 GHz can be increased from 1.782 dBi to 4.219 dBi, and the gain at 5.8 GHz can be increased from 2.766 dBi to 9.093 dBi, which indicates that the artificial magnetic conductor 100 in the embodiment of the utility model has a good reflection and antenna gain enhancement effect.

[0072] Table 2

[0073]

[0074] Table 2 shows the gain variation of the dual-frequency antenna when the artificial magnetic conductor 100 with (m x n) array arrangement of sub artificial magnetic conductors 10 is loaded, according to Table 1, under the premise of ensuring overall miniaturization, the dual-frequency antenna of the artificial magnetic conductor 100 with (m x n) array arrangement of sub artificial magnetic conductors 10 has the optimal performance, the gain at 2.45GHz is 4.219dBi, and the gain at 5.8GHz is 9.093dBi. It should be noted that the artificial magnetic conductor 100 with (2 x 2) array arrangement of sub artificial magnetic conductors 10 is only used to illustrate the influence of the artificial magnetic conductor 100 in the utility model on the performance of the antenna, and does not limit the arrangement mode of the sub artificial magnetic conductor 10 in the artificial magnetic conductor 100.

[0075] Figure 8 The reflection coefficient variation diagram of the dual-frequency antenna loaded with the artificial magnetic conductor provided by the embodiment of the utility model when the artificial magnetic conductor is bent along the first direction, wherein S7 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is not bent along the first direction X, S8 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 50mm along the first direction X, S9 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 75mm along the first direction X, S10 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 100mm along the first direction X, and it can be known from S7, S8, S9 and S10 in reference Figure 8 The reflection coefficient variation diagram of the dual-frequency antenna loaded with the artificial magnetic conductor provided by the embodiment of the utility model when the artificial magnetic conductor is bent along the first direction, wherein S7 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is not bent along the first direction X, S8 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 50mm along the first direction X, S9 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 75mm along the first direction X, S10 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 100mm along the first direction X, and it can be known from S7, S8, S9 and S10 in reference

[0076] Figure 9 The reflection coefficient variation diagram of the dual-frequency antenna loaded with the artificial magnetic conductor provided by the embodiment of the utility model when the artificial magnetic conductor is bent along the first direction, wherein S7 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is not bent along the first direction X, S8 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 50mm along the first direction X, S9 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 75mm along the first direction X, S10 represents the reflection coefficient variation curve of the dual-frequency antenna loaded with the artificial magnetic conductor 100 when the artificial magnetic conductor 100 is bent by 100mm along the first direction X, and it can be known from S7, S8, S9 and S10 in reference Figure 9As can be seen from S11, S12, S13 and S14 in the table, when the artificial magnetic conductor 100 is bent along the second direction Y, the shift of the resonance point is small, and the working performance of the dual-frequency antenna is almost not affected, and the overall has a certain bending resistance.

[0077] In conclusion, the artificial magnetic conductor 100 in the embodiment of the present application not only can effectively reduce the back radiation of the antenna loaded with the artificial magnetic conductor 100 and improve the antenna gain, but also has good bending resistance.

[0078] Figure 10 For Figure 3 The equivalent circuit of the sub-artificial magnetic conductor provided in the present application comprises a first end N1, a second end N2, a first capacitor C1, a second capacitor C2, a first inductor L1, a second inductor L2, a third inductor L3 and a fourth inductor L4. The first end N1 is electrically connected with one end of the first inductor L1, the other end of the first inductor L1 is electrically connected with one end of the second inductor L2, the third inductor L3 and the fourth inductor L4 respectively, the other end of the second inductor L2 is electrically connected with one end of the first capacitor C1, the other end of the first capacitor C1 is electrically connected with the second end N2, the other end of the third inductor L3 is electrically connected with one end of the second capacitor C2, the other end of the second capacitor C2 is electrically connected with the second end N2, and the other end of the fourth inductor L4 is electrically connected with the second end N2.

[0079] For example, the capacitance value of the first capacitor C1 can be 3.430pF, the capacitance value of the second capacitor C2 can be 1.060pF, the inductance value of the first inductor L1 can be 0.790nH, the inductance value of the second inductor L2 can be 0.695nH, the inductance value of the third inductor L3 can be 0.470nH, and the inductance value of the fourth inductor L4 can be 0.500nH.

[0080] It should be noted that the first resonance frequency of the sub-artificial magnetic conductor 100 is mainly caused by the loop composed of the fourth inductor L4, the second inductor L2 and the first capacitor C1, and the second resonance frequency of the sub-artificial magnetic conductor 100 is caused by the whole loop.

[0081] Figure 11 For Figure 3 The sub-artificial magnetic conductor provided in the present application and Figure 6 The phase reflection characteristic comparison chart of the equivalent circuit provided in the present application, wherein S15 represents Figure 3 The phase reflection characteristic curve chart of the sub-artificial magnetic conductor provided in the present application, S16 represents Figure 6 The phase reflection characteristic curve chart of the equivalent circuit provided in the present application, reference Figure 11 As can be seen from S15 and S16 in the table, the phase reflection results of the equivalent circuit and the artificial magnetic conductor 100 are basically consistent.

[0082] Based on the same concept, the embodiment of the utility model provides a wearable device, Figure 12 For the structure diagram of the wearable device provided by the embodiment of the utility model, refer to Figure 12 The wearable device 300 includes the artificial magnetic conductor 100 and the antenna 200 provided by any one of the above embodiments of the utility model, so the wearable device 300 includes the technical features of the artificial magnetic conductor 100, has the beneficial effects of the artificial magnetic conductor 100, and the same parts can refer to the description above.

[0083] Table 3

[0084]

[0085] Table 3

[0086] The embodiment of the utility model also carries out the simulation experiment of placing the above wearable device 300 on the human body, simulates through the electromagnetic field full-wave simulation software CST, and the simulation result is shown in Table 3, which is 0.168W / Kg, 0.210W / Kg and 0.109W / Kg (for 1g human tissue) and 0.107W / Kg, 0.075W / Kg and 0.106W / Kg (for 10g human tissue) at 2.45GHz, and 0.211W / Kg, 0.240W / Kg and 0.247W / Kg (for 1g human tissue) and 0.075W / Kg, 0.122W / Kg and 0.121W / Kg (for 10g human tissue) at 5.8GHz. According to the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and IEEE C95.1-2019 standard, the artificial magnetic conductor 100 in the embodiment of the utility model can effectively reduce the radiation intensity of the antenna 200 to the human body, which is conducive to reducing the SAR value of the wearable device 300.

[0087] It should be noted that the embodiment of the utility model does not limit the type of antenna 200, which can be the dual-frequency antenna mentioned in the above embodiments, or a single-frequency antenna, which can be set by the person skilled in the art according to actual needs.

[0088] The above specific implementation does not constitute a limitation on the protection scope of the utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An artificial magnetic conductor, characterized in that, The artificial magnetic conductor comprises a plurality of sub artificial magnetic conductors; The sub artificial magnetic conductor comprises a substrate, a radiation layer on one side of the substrate, and a ground layer on the side of the substrate away from the radiation layer; The radiation layer comprises a first part, a second part, and a plurality of third parts; the second part surrounds the first part, and there is a gap between the first part and the second part; the third parts are distributed in the gap and are connected with the first part and the second part respectively.

2. The artificial magnetic conductor according to claim 1, characterized in that The inner edge contour of the second part is a polygon; The geometric center of the inner edge contour of the second part coincides with the geometric center of the first part.

3. The artificial magnetic conductor of claim 2, wherein, The plurality of third parts comprise a first patch, a second patch, a third patch, and a fourth patch; The first patch, the second patch, the third patch, and the fourth patch are uniformly distributed around the geometric center of the first part.

4. The artificial magnetic conductor of claim 3, wherein, The equivalent circuit of the artificial magnetic conductor comprises a first end, a second end, a first capacitor, a second capacitor, a first inductor, a second inductor, a third inductor, and a fourth inductor; The first end is electrically connected with one end of the first inductor, the other end of the first inductor is electrically connected with one end of the second inductor, the third inductor, and the fourth inductor respectively, the other end of the second inductor is electrically connected with one end of the first capacitor, the other end of the first capacitor is electrically connected with the second end, the other end of the third inductor is electrically connected with one end of the second capacitor, the other end of the second capacitor is electrically connected with the second end, and the other end of the fourth inductor is electrically connected with the second end.

5. The artificial magnetic conductor of claim 1, wherein, The length of the substrate along a first direction is a x λ, the length of the substrate along a second direction is b x λ, and the length of the substrate along a third direction is c x λ, where λ represents the wavelength of an electromagnetic wave satisfying a preset frequency in free space, a satisfies 0.15 ≤ a ≤ 0.3, b satisfies 0.15 ≤ b ≤ 0.3, and c satisfies 0.003 ≤ c ≤ 0.005; The first direction, the second direction, and the third direction intersect with each other.

6. The artificial magnetic conductor of claim 1, wherein, The operating frequency of the sub artificial magnetic conductor comprises a first resonant frequency and a second resonant frequency, and the first resonant frequency is smaller than the second resonant frequency; The outer contour size of the first part is negatively related to the first resonant frequency; The size of the second part is positively related to the first resonant frequency, and the size of the second part is negatively related to the second resonant frequency.

7. The artificial magnetic conductor of claim 1, wherein, The dielectric constant C1 of the substrate satisfies 3.43 ≤ C1 ≤ 3.66; The thickness M1 of the substrate satisfies 0.1 mm ≤ M1 ≤ 1.52 mm; The thickness M2 of the radiation layer satisfies 0.018 mm ≤ M2 ≤ 0.035 mm; The thickness M3 of the ground layer satisfies 0.018 mm ≤ M3 ≤ 0.035 mm.

8. The artificial magnetic conductor of claim 1, wherein, The substrates of the plurality of sub artificial magnetic conductors are arranged in the same layer; The radiation layers of the plurality of sub artificial magnetic conductors are arranged in the same layer; The ground layers of the plurality of sub artificial magnetic conductors are arranged in the same layer.

9. The artificial magnetic conductor of claim 1, wherein, The ground layer covers the substrate.

10. A wearable device, comprising: The artificial magnetic conductor comprises a plurality of sub artificial magnetic conductors;

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