CN216872252U - Implantable small antenna - Google Patents
Implantable small antenna Download PDFInfo
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- CN216872252U CN216872252U CN202220707776.7U CN202220707776U CN216872252U CN 216872252 U CN216872252 U CN 216872252U CN 202220707776 U CN202220707776 U CN 202220707776U CN 216872252 U CN216872252 U CN 216872252U
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- 229910052751 metal Inorganic materials 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 45
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 239000000523 sample Substances 0.000 claims abstract description 17
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 230000000747 cardiac effect Effects 0.000 abstract description 3
- 210000003205 muscle Anatomy 0.000 abstract description 3
- 239000007943 implant Substances 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 12
- 230000005855 radiation Effects 0.000 description 8
- 210000001519 tissue Anatomy 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 6
- 238000004088 simulation Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000560 biocompatible material Substances 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000013334 tissue model Methods 0.000 description 1
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Abstract
The utility model relates to an implantable small antenna which comprises a circular dielectric substrate, a metal radiating sheet and a metal grounding plate, wherein the metal radiating sheet is positioned on the upper surface of the dielectric substrate, the metal grounding plate is positioned on the lower surface of a cut-off substrate, four arc-shaped slotted gap belts are arranged on the metal radiating sheet, one arc-shaped slotted gap belt is arranged on one semicircle, the other three arc-shaped slotted gap belts are arranged on the other semicircle, and a feed probe penetrating through the dielectric substrate and the metal grounding plate is further arranged at the semicircle position where only one arc-shaped slotted gap belt is arranged. The utility model is used for receiving energy of implanted devices such as a cardiac pacemaker, a cochlear implant and the like, and can solve the technical problems that the size of an implantable antenna is large, and the normal work is influenced by frequency deviation caused by human body complex environment and muscle movement.
Description
Technical Field
The utility model relates to the field of medical equipment, in particular to an implantable small antenna.
Background
In recent years, medical implantable electronic devices have been widely used in the fields of remote health monitoring, disease treatment, and the like, from cardiac pacemakers to wireless capsule endoscopes. The microstrip patch antenna is an implanted antenna which is widely applied, the implanted antenna is a key component in wireless energy transmission, and after the implanted device is implanted into a target body, the wireless energy transmission needs a transmitting antenna and a receiving antenna to transmit and receive energy.
Traditional medical treatment implantation equipment adopts battery and low frequency inductance coil, and both size is big, and battery life is low, and coil transmission rate is slow. In the practical application process, the structure and performance of the implanted device are greatly limited by the complexity of human tissues, and meanwhile, the overall performance of the implanted antenna can be directly influenced by the difference of dielectric constants and conductivities of various organs of a living body.
SUMMERY OF THE UTILITY MODEL
The utility model aims to design an implanted patch antenna which is used for receiving energy of implanted devices such as a cardiac pacemaker, a cochlear implant and the like and can solve the technical problems that the size of the implanted antenna is large, and the normal work is influenced by frequency deviation caused by the complex environment of a human body and muscle movement.
In order to achieve the purpose, the utility model adopts the following technical scheme: an implantable miniature antenna comprises a circular dielectric substrate, a metal radiating sheet and a metal ground plate, wherein the metal radiating sheet is located on the upper surface of the dielectric substrate, the metal ground plate is located on the lower surface of a cut-off substrate, four arc-shaped slotted band is arranged on the metal radiating sheet, one arc-shaped slotted band is arranged on one semicircle, the other three arc-shaped slotted bands are arranged on the other semicircle, and a feed probe penetrating through the dielectric substrate and the metal ground plate is further arranged at the semicircle position where only one arc-shaped slotted band is arranged.
Preferably, the arc-shaped slotted bands are all semicircular slotted bands, wherein the semicircular radius of the semicircular slotted band provided with the feed probe semicircle is the second largest of the four semicircular slotted bands.
Preferably, the other three arc-shaped slotted slit belts are three concentric semicircular slotted slit belts, and the distance between the concentric semicircular slotted slit belts decreases inwards.
Preferably, the three concentric semicircular slotted bands are respectively a first arc-shaped slot, a second arc-shaped slot and a third arc-shaped slot from outside to inside, and the first arc-shaped slot, the second arc-shaped slot, the first arc-shaped slot and the third arc-shaped slot form two 1/4 wavelength slot lines.
Preferably, the arc-shaped slotted band positioned on the semicircle provided with the feed probe is a fourth arc-shaped slot, and the width of the fourth arc-shaped slot is consistent with that of the first arc-shaped slot.
Preferably, the feed probe is composed of an inner core and an insulating layer, the feed probe penetrates through the dielectric substrate on the metal floor and is connected to the front metal radiating plate, and the insulating layer surrounds the inner core.
Preferably, the metal radiation sheet is further covered with a medium loading layer.
The utility model has the following beneficial effects: the metal resonance unit adopted by the antenna is composed of an upper surface metal radiation layer positioned on the outer side of a medium substrate, the resonance frequency of the antenna is reduced due to the interaction of a plurality of resonance arc-shaped rings, compared with other double-layer and three-layer antennas, the antenna is only a single layer, the thickness is obviously reduced, and the structural size of the antenna is pi x (5)2mm is multiplied by 0.635mm, the technical problem that the size of the existing implanted antenna is large is solved, the miniaturization of the antenna is realized, and the space occupied by the antenna in vivo equipment is reduced. Compared with other antennas operating at low frequency band, the antenna operates at 5G (n 794.4-5 Ghz) frequency band, is suitable for communication system of wireless body area network, and can be used for collecting and transmitting physiological signals in vivo subsequentlyData transmission is facilitated, and meanwhile the anti-interference capacity of the antenna is improved. The implanted antenna has the advantages of simple structure, convenience in processing and manufacturing, capability of stably transmitting energy, miniaturization, data transmission and biocompatibility, and high practicability.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a top view of the present invention;
FIG. 2 is a side cross-sectional view of the present invention;
figure 3 is a graph of return loss in simulated human tissue of the present invention.
In the figure: 1-a first arc-shaped groove; 2-a second arc-shaped groove; 3-a third arc-shaped groove; 4-a fourth arc-shaped groove; 5-a feed probe; 6-a dielectric substrate; 7-metal radiating fins; 8-metal ground plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
The following are only preferred embodiments of the present invention, and the scope of the present invention is not limited to the following examples, and all technical solutions belonging to the idea of the present invention belong to the scope of the present invention.
The microstrip antenna is formed by sticking a metal radiation sheet on a dielectric substrate with a metal radiation sheet on the front surface and coating a metal thin layer on the back surface as a grounding plate, and has two main feeding modes of a microstrip line and a coaxial line. The microstrip antenna excites a radiation field between a metal patch and a metal ground plate, and radiates outwards through a gap between the periphery of the patch and the ground plate, and is also called as a slot antenna.
Referring to the accompanying drawings 1-2 of the specification, an implantable miniature antenna comprises a dielectric substrate 6, a metal radiating patch 7 and a metal ground plate 8 which are all circular. The dielectric substrate uses Rogers 3010 as a dielectric material of the antenna, has a relative dielectric constant of 10.2 and a loss tangent of 0.003, and uses a high dielectric constant dielectric in order to reduce the resonant frequency without changing the patch area of the antenna. The overall size of the antenna is pi x (5)2mm x 0.635mm, the metal radiating plate 7 is positioned on the front surface of the dielectric substrate 6, and the metal grounding plate 8 is positioned on the back surface of the dielectric substrate 6. The metal radiating patch 7 and the metal ground plate 8 are both circular and have a diameter corresponding to the dielectric substrate 6. The metal radiation sheet 7 comprises four arc-shaped slotted gaps, namely a first arc-shaped slot 1, a second arc-shaped slot 2, a third arc-shaped slot 3 and a fourth arc-shaped slot 4. The radius (outer arc radius) of the first arc-shaped groove 1 on the metal radiation sheet 7 is 4.4mm, the width is 0.3mm, the radius (2.5 mm) of the second arc-shaped groove 2, the width is 0.4mm, the radius (1 mm) of the third arc-shaped groove 3, the width is 0.5mm, and the fourth arc-shaped grooveThe radius of the arc-shaped groove 4 is 3.6mm, and the width is 0.3 mm. The outer side of the metal radiating sheet is an arc line, so that a larger radiating area can be obtained in a limited space, and the gain of the antenna is improved. Compared with the traditional linear slotting structure, the arc slotting structure has the advantages that the arc slotting structure is adopted, the current path is further prolonged, the resonance frequency is lower, the size of the antenna is effectively reduced, and for the same size of the antenna, the more the arc slots are, the more the corresponding resonance frequency is reduced. The arc has smooth edges, simple structure and small edge effect, and is easy to process in practical application. The arcs of the utility model are all concentric circles, so that the slotting of the radiating sheet is more uniform, and the performance of the antenna is improved. The distances among the first arc-shaped groove 1, the second arc-shaped groove 2 and the third arc-shaped groove 3 are gradually decreased inwards, the area of the radiation sheet can be fully utilized, more arc-shaped grooves are arranged, the current path is increased, the resonant frequency is adjusted more conveniently, and the manufacturing process is simplified. The first arc-shaped groove 1, the second arc-shaped groove 2, the first arc-shaped groove 1 and the third arc-shaped groove 3 form two 1/4 wavelength groove lines, the two 1/4 wavelength groove lines have similar frequencies, a broadband can be combined, and the size of the implanted antenna can be reduced. The widths of the first arc-shaped groove 1 and the fourth arc-shaped groove 4 are consistent, so that the uniformity of current density is obviously improved.
Referring to the attached fig. 2 of the specification, the antenna of the present invention further includes a feed probe 5, the feed probe 5 is composed of an internal core wire and an insulating layer, the radius of an inner core of the feed probe 5 is set to be 0.4mm, the feed probe is located on a metal floor, penetrates through a dielectric substrate, and then is connected to a front metal radiating plate, the radius of the insulating layer after the inner core is surrounded by the feed probe is 0.92mm, and the impedance of a port is 50 Ω. The size, return loss and impedance matching of the microstrip antenna can be optimized by adopting the position of the feed point.
The antenna further comprises a dielectric loading layer covering the radiating patch 7. The medium loading layer covers the surface of the radiating metal sheet 7, and an aluminum oxide film made of a biocompatible material is adopted, so that the direct contact of human tissues with the surface of the implanted antenna is avoided, the influence of the radiating sheet on a human body is isolated, the human tissues cannot repel the antenna, and the resonant frequency of the antenna can be adjusted.
In order to approach the human environment, the implantable antenna needs to be simulated in an environment simulating human tissues, and a layer of skin tissue model or muscle model is generally adopted to simulate the implantable antenna.
The Simulation Software uses High-Frequency Simulation Software (HFSS); the electrical parameters of human tissue change with the change of frequency, and in order to be closer to the real implantation environment, a human body simulation model of skin-fat lamination can be adopted for simulation.
The simulation model of the microstrip antenna is human skin tissue, the model can approximately simulate the electrical properties of human skin, the relative dielectric constant of the skin is 2.686 at 4.5Ghz, the conductivity is 0.296S/m, the relative dielectric constant of fat is 5.076, the conductivity is 0.2117S/m, the distance between the upper boundary of the simulation model and the microstrip antenna is 3mm, the distance between the other boundary and the microstrip antenna is 40mm, the simulation and the tested echo loss of the tested microstrip antenna refer to the simulation graph of the depth of 3mm of the reflection coefficient along with the frequency when the antenna is implanted in the skin and the fat tissue, the differential reflection coefficient of the microstrip antenna is less than-10 dB around 4.5Ghz, the bandwidth is 80Mhz, and the transmission energy range is wider.
Claims (7)
1. The implantable miniature antenna is characterized by comprising a circular dielectric substrate, a metal radiating sheet and a metal ground plate, wherein the metal radiating sheet is positioned on the upper surface of the dielectric substrate, the metal ground plate is positioned on the lower surface of a cut-off substrate, four arc-shaped slotted band strips are arranged on the metal radiating sheet, one arc-shaped slotted band strip is arranged on one semicircle, the other three arc-shaped slotted band strips are arranged on the other semicircle, and a feed probe penetrating through the dielectric substrate and the metal ground plate is further arranged at the semicircle position where only one arc-shaped slotted band strip is arranged.
2. The implantable miniature antenna of claim 1, wherein the arc-shaped slotted slot strips are semicircular slotted slot strips, wherein the semicircular radius of the semicircular slotted slot strips located in the semicircle provided with the feed probe is the second largest of the four semicircular slotted slot strips.
3. The implantable miniature antenna of claim 1, wherein said another three arc shaped slotted slit strips are three concentric semi-circular slotted slit strips, and the distance between the concentric semi-circular slotted slit strips decreases inwards.
4. The implantable miniature antenna of claim 3, wherein said three concentric semicircular slotted bands are respectively a first arc-shaped slot, a second arc-shaped slot and a third arc-shaped slot from outside to inside, said first arc-shaped slot and said second arc-shaped slot and said first arc-shaped slot and said third arc-shaped slot form two 1/4 wavelength slot lines.
5. The implantable miniature antenna according to claim 4, wherein the arc shaped slotted slot in the semi-circle in which the feeding probe is disposed is a fourth arc shaped slot having a width corresponding to the width of the first arc shaped slot.
6. The implantable miniature antenna of claim 1, wherein said feed probe comprises an inner core and an insulating layer, said feed probe passes through a dielectric substrate on a metal ground plane and is connected to a front metal radiating patch, and said insulating layer surrounds said inner core.
7. The implantable miniature antenna of claim 1 wherein said metal radiating patch is further coated with a dielectric loading layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220707776.7U CN216872252U (en) | 2022-03-29 | 2022-03-29 | Implantable small antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220707776.7U CN216872252U (en) | 2022-03-29 | 2022-03-29 | Implantable small antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216872252U true CN216872252U (en) | 2022-07-01 |
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ID=82124367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220707776.7U Expired - Fee Related CN216872252U (en) | 2022-03-29 | 2022-03-29 | Implantable small antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216872252U (en) |
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2022
- 2022-03-29 CN CN202220707776.7U patent/CN216872252U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20220701 |