Low profile miniaturized antenna for medical wearables

Abstract

The utility model discloses a low profile miniaturized antenna for medical wearing equipment, including reflector plate and radiating plate, reflector plate includes lower base plate, and the bottom surface of lower base plate is equipped with metal ground layer, and the top surface of lower base plate is equipped with AMC super surface, and AMC super surface includes multiple AMC units that are arranged in array, and AMC unit is electrically connected with metal ground layer, and the reflection phase of AMC super surface is in the range of 90 DEG at 2.40 2.48GHz frequency band, and radiating plate includes upper base plate, and the bottom surface of upper base plate is bonded on AMC super surface through adhesive layer, and the top surface of upper base plate is equipped with main radiating body. The low profile miniaturized antenna for medical wearing equipment can reduce antenna profile height, reduce weight, reduce back radiation energy that leaks to human body side, save system power consumption and improve wearing comfort and portability under the premise of canceling traditional thick heavy reflection cavity, satisfy the application demand of medical wearing equipment to light and thin, low back radiation antenna.

Description

Technical Field

[0001] This utility model relates to the field of antenna technology, and in particular to a low-profile miniaturized antenna for medical wearable devices. Background Technology

[0002] Traditional medical wearable devices feature large antennas with high profiles, making it difficult to meet the demands for thinner and smaller designs, thus affecting wearing comfort and portability. Furthermore, the antennas in traditional medical wearable devices exhibit strong back radiation. During use, this back-radiated energy propagates towards the body, wasting energy and potentially causing adverse effects. To mitigate this, current technology uses a reflective surface a quarter wavelength away from the antenna to reduce back radiation. However, this inevitably limits further reduction in antenna profile height, making it even more difficult to meet the trends of thinner and smaller medical wearable devices. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a low-profile miniaturized antenna for medical wearable devices.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a low-profile miniaturized antenna for medical wearable devices, comprising:

[0005] The reflector includes a lower substrate, a metal ground layer on the bottom surface of the lower substrate, and an AMC metasurface on the top surface of the lower substrate. The AMC metasurface includes multiple AMC units arranged in an array. The AMC units are electrically connected to the metal ground layer. The reflection phase of the AMC metasurface in the 2.40-2.48 GHz frequency band is within ±90°.

[0006] The radiating plate includes an upper substrate, the bottom surface of which is bonded to the AMC super surface by an adhesive layer, and the top surface of the upper substrate is provided with a main radiator.

[0007] In one embodiment, the main radiator includes a first ring frame structure and a second ring frame structure, and the first ring frame structure and the second ring frame structure form a double resonance through electromagnetic coupling.

[0008] In one embodiment, the first ring frame structure includes a first rectangular frame, the middle of the side of the first rectangular frame near the second ring frame structure has an extended branch extending toward the direction of the second ring frame structure, a first rectangular portion is connected to one side of the first rectangular frame, a second rectangular portion is connected to one end of the first rectangular portion near the center of the first rectangular frame, the first rectangular portion and the second rectangular portion are offset, and the distance between the first rectangular portion and the second ring frame structure is greater than the distance between the second rectangular portion and the second ring frame structure.

[0009] In one embodiment, the extension branch includes a connected isosceles trapezoidal portion and a third rectangular portion, the third rectangular portion being connected to the upper base of the isosceles trapezoidal portion, and the lower base of the isosceles trapezoidal portion being connected to the first rectangular frame.

[0010] In one embodiment, a triangular portion is provided at one corner of the first rectangular frame, connecting its two perpendicular sides, and the triangular portion is disposed away from the first rectangular portion and the outer extension branches.

[0011] In one embodiment, the second ring frame structure includes a second rectangular frame, the middle of which on the side away from the first ring frame structure has an inner extension extending toward the first ring frame structure.

[0012] In one embodiment, the inner extension is elongated.

[0013] In one embodiment, the AMC unit includes an outer frame and a central body located within the outer frame. The outer frame is square in shape, and a set of diagonal corners of the outer frame have triangular extensions. The extensions are located within the outer frame and connect two adjacent sides of the outer frame that are perpendicular to each other. The central body is square in shape, and each side of the central body has a T-shaped slit in the middle. The central body has a chamfer in the area corresponding to the extension.

[0014] In one embodiment, the sum of the thicknesses of the reflector, the adhesive layer, and the radiating plate is less than or equal to 4.3 mm.

[0015] In one embodiment, when viewed from above, the low-profile miniaturized antenna for a medical wearable device is surrounded by the AMC metasurface.

[0016] The beneficial effects of this invention are as follows: This low-profile miniaturized antenna for medical wearable devices uses an AMC metasurface with a reflection phase within the range of ±90° in the 2.40-2.48 GHz range on the top surface of the lower substrate, and directly bonds the upper substrate to the AMC metasurface. This eliminates the need for an air cavity with a thickness of 1 / 4 wavelength between the main radiator and the metal ground layer. By utilizing the in-phase reflection characteristics of the AMC to suppress back radiation, the total thickness of the antenna is compressed to less than 1 / 4 wavelength. This low-profile miniaturized antenna for medical wearable devices, by eliminating the traditional heavy reflector cavity, can reduce the antenna profile height and weight, and also reduce the back radiation energy leaked to the human body side. This results in reduced system power consumption and improved wearing comfort and portability, meeting the application requirements of medical wearable devices for thin, light, and low back radiation antennas. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the low-profile miniaturized antenna for medical wearable devices in this embodiment.

[0019] Figure 2 This is a top view of the radiating plate in the low-profile miniaturized antenna for a medical wearable device according to this embodiment.

[0020] Figure 3 This is a top view of the reflector in the low-profile miniaturized antenna for a medical wearable device according to this embodiment.

[0021] Figure 4 This is a schematic diagram of the AMC unit in the low-profile miniaturized antenna for medical wearable devices in this embodiment 1.

[0022] Figure 5 This is a reflection phase curve diagram of the low-profile miniaturized antenna for medical wearable devices in this embodiment 1;

[0023] Figure 6 This is the S11 curve diagram of the low-profile miniaturized antenna for medical wearable devices in this embodiment.

[0024] Figure 7 This is a radiation diagram of the low-profile miniaturized antenna for medical wearable devices in this embodiment.

[0025] Explanation of icon numbers:

[0026] 1. Reflector; 11. Lower substrate; 12. Metal ground layer;

[0027] 2. Radiation plate; 21. Upper substrate;

[0028] 3. AMC metasurface; 31. AMC unit; 311. Outer frame; 3111. Extension; 312. Central body; 3121. T-shaped slot; 3122. Chamfer;

[0029] 4. Main radiator; 41. First ring frame structure; 411. First rectangular frame; 412. Outer extension branch; 4121. Isosceles trapezoidal part; 4122. Third rectangular part; 413. First rectangular part; 414. Second rectangular part; 415. Triangular part; 42. Second ring frame structure; 421. Second rectangular frame; 422. Inner extension;

[0030] 5. Adhesive layer. Detailed Implementation

[0031] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0032] The technical solutions of the present utility model 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 utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] It should be noted that if the embodiments of this utility model involve directional indicators such as up, down, left, right, front, back, etc., the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indicators will also change accordingly.

[0034] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0035] Furthermore, if the meaning of "and / or" in the entire text is to include three parallel solutions, taking "and A / or B" as an example, it includes solution A, solution B, and a solution that simultaneously satisfies both A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] Example 1

[0038] Please refer to Figures 1 to 7 Embodiment 1 of this utility model is as follows:

[0039] Please refer to Figures 1 to 4 A low-profile miniaturized antenna for wearable medical devices includes a reflector 1 and a radiating plate 2. The reflector 1 includes a lower substrate 11, with a metal ground layer 12 on the bottom surface of the lower substrate 11 and an AMC metasurface 3 on the top surface of the lower substrate 11. The AMC metasurface 3 includes multiple AMC units 31 arranged in an array. The AMC units 31 are electrically connected to the metal ground layer 12. The reflection phase of the AMC metasurface 3 is within ±90° in the 2.40-2.48 GHz frequency band. The radiating plate 2 includes an upper substrate 21, with the bottom surface of the upper substrate 21 bonded to the AMC metasurface 3 by an adhesive layer 5. The top surface of the upper substrate 21 is provided with a main radiator 4.

[0040] The main radiator 4 includes a first ring structure 41 and a second ring structure 42, which form a dual resonance through electromagnetic coupling. The main radiator 4 is split into a first ring structure 41 and a second ring structure 42 without metal bridging. The first ring structure 41 and the second ring structure 42 can naturally form a dual resonance within the Bluetooth frequency band through electromagnetic coupling, thereby widening the operating bandwidth with a single feed point and without an additional matching network. This ensures that the antenna maintains low reflection in the 2.40-2.48 GHz range while keeping the overall thickness unchanged.

[0041] In this embodiment, the first ring frame structure 41 includes a first rectangular frame 411. The middle part of the first rectangular frame 411 near the second ring frame structure 42 has an extension branch 412 extending toward the second ring frame structure 42. A first rectangular portion 413 is connected to one side of the first rectangular frame 411. A second rectangular portion 414 is connected to one end of the first rectangular portion 413 near the center of the first rectangular frame 411. The first rectangular portion 413 and the second rectangular portion 414 are offset. The distance between the first rectangular portion 413 and the second ring frame structure 42 is greater than the distance between the second rectangular portion 414 and the second ring frame structure 42. Guided by the extension branches 412 and the misaligned rectangular portion of the first ring structure 41, the current path on the first ring structure 41 is locally extended, causing its low-order resonant point to be finely adjusted towards the low frequency direction; while the second ring structure 42 has a larger distance from the first rectangular portion 413 and a smaller distance from the second rectangular portion 414, resulting in a gradient change in coupling strength. Thus, without adding any lumped elements, the resonant frequencies of the first ring structure 41 and the second ring structure 42 are finely separated and continuously transitioned, ensuring that the edge of the dual resonant band fully covers the Bluetooth frequency band and suppressing the deep valley mismatch caused by the frequency being too close.

[0042] The extension stub 412 includes a connected isosceles trapezoidal portion 4121 and a third rectangular portion 4122. The third rectangular portion 4122 is connected to the upper base of the isosceles trapezoidal portion 4121, and the lower base of the isosceles trapezoidal portion 4121 is connected to the first rectangular frame 411. The extension stub 412, formed by the isosceles trapezoidal portion 4121 and the third rectangular portion 4122, can smoothly change the current direction, creating a gradual inductance in the hypotenuse region of the trapezoid. This reduces the excitation of higher-order modes caused by abrupt right-angle changes, thereby reducing the risk of pattern splitting and further fine-tuning the electrical length of the first ring frame structure 41 to ensure stable dual-resonance positions.

[0043] The first rectangular frame 411 has a triangular portion 415 at one corner that connects its two perpendicular sides. The triangular portion 415 is located away from the first rectangular portion 413 and the outer extension branch 412.

[0044] The second ring frame structure 42 includes a second rectangular frame 421. The middle portion of the side of the second rectangular frame 421 away from the first ring frame structure 41 has an inner extension 422 extending towards the first ring frame structure 41. In this embodiment, the inner extension 422 is elongated. The inner extension 422 of the second rectangular frame 421 protrudes towards the first ring frame structure 41, allowing the resonant frequency of the second ring frame structure 42 to be finely adjusted towards higher frequencies without changing its overall dimensions. This creates a wider double-peak overlap region with the first ring frame structure 41, preventing reflection spikes at the edges of the Bluetooth frequency band.

[0045] The AMC unit 31 includes an outer frame 311 and a central body 312 located within the outer frame 311. The outer frame 311 is square in shape, and a set of diagonal extensions 3111 are triangular in shape. The extensions 3111 are located within the outer frame 311 and connect two adjacent sides of the outer frame 311 that are perpendicular to each other. The central body 312 is square in shape, and a T-shaped slit 3121 is provided in the middle of each side of the central body 312. The central body 312 has a chamfer 3122 in the area corresponding to the extensions 3111.

[0046] In this embodiment, the sum of the thicknesses of the reflector 1, the adhesive layer 5, and the radiating plate 2 is less than or equal to 4.3 mm, which corresponds to 0.035λ of the Bluetooth center frequency. In other words, in this embodiment, the overall thickness of the low-profile miniaturized antenna used in medical wearable devices can be less than 0.035λ of the Bluetooth center frequency, truly achieving a low profile.

[0047] When viewed from above, the low-profile miniaturized antenna used in medical wearable devices is surrounded by the AMC metasurface 3, which forms a continuous shielding ring outside the radiation edge of the AMC array. This can cut off the edge diffraction current, reduce backscattering and lateral spurious emissions, thereby further suppressing back radiation and improving the front-to-back ratio without adding an additional shield, thus meeting the low SAR requirements of medical wearables.

[0048] In this embodiment, the total thickness of the low-profile miniaturized antenna used for medical wearable devices is 4.245mm, the size of the reflector 1 is 52.5mm×31.5mm×2.54mm, the size of the radiating plate 2 is 40mm×20mm×1.27mm, and both the lower substrate 11 and the upper substrate 21 are made of Rogers 3210 substrate.

[0049] Figure 5 This is a reflection phase curve of the low-profile miniaturized antenna for medical wearable devices in this embodiment. Figure 5 It is evident that the Bluetooth frequency band exhibits in-phase reflection characteristics within this range.

[0050] Figure 6 This is a graph showing the S11 curve of the low-profile miniaturized antenna for a medical wearable device in this embodiment. From... Figure 6 As can be seen, the 2.4-2.484GHz range is all below the reference level of -6dB, which meets the design requirements.

[0051] Figure 7 This is a radiation diagram of the low-profile miniaturized antenna for a medical wearable device according to this embodiment. From Figure 7 As can be seen, the back radiation of the antenna loaded with the AMC metasurface is 4.3 dB lower than that of the antenna without the AMC metasurface.

[0052] The above are merely optional embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A low-profile miniaturized antenna for wearable medical devices, characterized in that: include The reflector includes a lower substrate, a metal ground layer on the bottom surface of the lower substrate, and an AMC metasurface on the top surface of the lower substrate. The AMC metasurface includes multiple AMC units arranged in an array. The AMC units are electrically connected to the metal ground layer. The reflection phase of the AMC metasurface in the 2.40-2.48 GHz frequency band is within ±90°. The radiating plate includes an upper substrate, the bottom surface of which is bonded to the AMC super surface by an adhesive layer, and the top surface of the upper substrate is provided with a main radiator.

2. The low-profile miniaturized antenna for wearable medical devices according to claim 1, characterized in that: The main radiator includes a first ring frame structure and a second ring frame structure, and the first ring frame structure and the second ring frame structure form a double resonance through electromagnetic coupling.

3. The low-profile miniaturized antenna for wearable medical devices according to claim 2, characterized in that: The first ring frame structure includes a first rectangular frame. The middle part of the first rectangular frame near the second ring frame structure has an extension branch extending toward the direction of the second ring frame structure. A first rectangular part is connected to one side of the first rectangular frame. A second rectangular part is connected to one end of the first rectangular part near the center of the first rectangular frame. The first rectangular part and the second rectangular part are staggered. The distance between the first rectangular part and the second ring frame structure is greater than the distance between the second rectangular part and the second ring frame structure.

4. The low-profile miniaturized antenna for wearable medical devices according to claim 3, characterized in that: The extended branch includes a connected isosceles trapezoidal portion and a third rectangular portion. The third rectangular portion is connected to the upper base of the isosceles trapezoidal portion, and the lower base of the isosceles trapezoidal portion is connected to the first rectangular frame.

5. The low-profile miniaturized antenna for wearable medical devices according to claim 3, characterized in that: The first rectangular frame has a triangular portion at one corner that connects its two perpendicular sides, and the triangular portion is located away from the first rectangular portion and the outer extension branches.

6. The low-profile miniaturized antenna for medical wearable devices according to claim 2, characterized in that: The second ring frame structure includes a second rectangular frame, and the middle part of the second rectangular frame away from the side of the first ring frame structure has an inner extension extending toward the direction of the first ring frame structure.

7. The low-profile miniaturized antenna for wearable medical devices according to claim 6, characterized in that: The inner extension is elongated.

8. The low-profile miniaturized antenna for wearable medical devices according to claim 1, characterized in that: The AMC unit includes an outer frame and a central body located within the outer frame. The outer frame is square in shape, and a set of diagonal corners of the outer frame have triangular extensions. The extensions are located within the outer frame and connect two adjacent sides of the outer frame that are perpendicular to each other. The central body is square in shape, and each side of the central body has a T-shaped slit in the middle. The central body has a chamfer in the area corresponding to the extension.

9. The low-profile miniaturized antenna for wearable medical devices according to claim 1, characterized in that: The sum of the thicknesses of the reflector, adhesive layer, and radiating plate is less than or equal to 4.3 mm.

10. The low-profile miniaturized antenna for medical wearable devices according to claim 1, characterized in that: When viewed from above, the low-profile miniaturized antenna for medical wearable devices is surrounded by the AMC metasurface.

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