CN114142225A - Implanted antenna applied to ISM frequency band - Google Patents
Implanted antenna applied to ISM frequency band Download PDFInfo
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- CN114142225A CN114142225A CN202111450498.8A CN202111450498A CN114142225A CN 114142225 A CN114142225 A CN 114142225A CN 202111450498 A CN202111450498 A CN 202111450498A CN 114142225 A CN114142225 A CN 114142225A
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- metal strip
- ism band
- fat
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- 239000002184 metal Substances 0.000 claims abstract description 65
- 239000000758 substrate Substances 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims description 6
- 239000004642 Polyimide Substances 0.000 claims description 3
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 229920001721 polyimide Polymers 0.000 claims description 3
- 210000003205 muscle Anatomy 0.000 abstract description 46
- 210000001519 tissue Anatomy 0.000 abstract description 16
- 239000007943 implant Substances 0.000 abstract description 2
- 102100032533 ADP/ATP translocase 1 Human genes 0.000 description 7
- 101000768061 Escherichia phage P1 Antirepressor protein 1 Proteins 0.000 description 7
- 101000796932 Homo sapiens ADP/ATP translocase 1 Proteins 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000004088 simulation Methods 0.000 description 4
- 210000001035 gastrointestinal tract Anatomy 0.000 description 2
- 238000002513 implantation Methods 0.000 description 2
- 210000000577 adipose tissue Anatomy 0.000 description 1
- -1 and preferably Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000000056 organ Anatomy 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000013334 tissue model Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- Details Of Aerials (AREA)
Abstract
The application provides an implant antenna for ISM frequency channel relates to medical equipment technical field, includes: the dielectric substrate (100) is provided with a first metal strip (201) and a second metal strip (202) which are connected in a printing mode on the upper surface of the dielectric substrate (100); printing a rectangular metal sheet (300) at the end part of the lower surface of the medium substrate (100); printing a feeder line on the medium substrate (100) along one long side, and supplying power to the first metal strip (201) through the feeder line; a feeding point is provided between an end of the feeding line and the rectangular metal sheet (300). The antenna provided by the embodiment of the application can cover the frequency band of ISM2.4GHz in muscles, human tissues with similar muscle medium parameters and fat with obviously different muscle medium parameters.
Description
Technical Field
The application relates to the technical field of medical equipment, in particular to an implanted antenna applied to an ISM frequency band.
Background
Implantable medical devices using wireless communication have many applications in the medical field, such as capsule endoscopes and wirelessly charged cardiac pacemakers, in which an implantable antenna plays an important role in transmitting information inside and outside the human body. The implanted antenna works in the human body, different human tissues have different electromagnetic parameters, and the value of the electromagnetic parameters can also change along with the frequency.
Most of the existing implanted antennas are designed for being implanted into muscles or skins, are suitable for working on materials with relatively close medium parameters, and can work in the muscles, the skins and the gastrointestinal tracts. Since the dielectric parameters of fat differ considerably from the aforementioned tissue, the antenna cannot cover the operating band in fat. In the actual human body structure, the muscle is very close to the fat, the antenna implantation position is difficult to control the muscle or the fat, and an antenna which can work in the muscle and the fat is required to be designed.
Disclosure of Invention
In view of this, the present application provides an implanted antenna applied to the ISM frequency band, which can solve the technical problem that the implanted antenna can cover the ism2.4ghz in two tissues by widening the bandwidth, because the difference between the muscle and the fat medium parameters is large.
The embodiment of the application provides an implant antenna applied to ISM frequency band, which comprises: the dielectric substrate is printed with a first metal strip and a second metal strip which are connected in a printing mode on the upper surface of the dielectric substrate; printing a rectangular metal sheet at the end part of the lower surface of the medium substrate; printing a feeder line on the dielectric substrate along one long side, and supplying power to the first-loop metal strip through the feeder line; a feeding point is provided between the end of the feeding line and the rectangular metal sheet.
Further, the first metal strip is bent clockwise for 1.5 turns.
Further, the second metal strip is bent for 2 circles in the counterclockwise direction.
Further, the feeder line is composed of three first feeder lines, second feeder lines and third feeder lines with different widths; the feeding point is arranged between the first feeding line and the rectangular metal sheet; the third feeder is connected with the first return metal strip.
Further, the width of the first feeder line is 0.4 mm; the width of the second feeder line is 0.1 mm; the third feeder line width is 0.3 mm.
Further, the dielectric substrate is made of polyimide.
Further, the outer layer of the antenna is wrapped by a plastic film with the thickness of 13 um.
Further, the dielectric substrate is rectangular and has the following dimensions: 7 mm. times.2 mm. times.70 um.
Further, the total width of the first metal strip is 2 mm; the maximum length of the first metal strip is 1.4mm, and the length of the last section of the first metal strip is 0.7 mm; the total width of the second clip metal strip is 1.5mm, and the maximum length of the second clip metal strip is 3.7 mm.
Further, the size of the rectangular metal sheet is 1.6mm × 2 mm.
The implanted antenna comprises two metal strips with a loop structure, two resonances can be excited in muscle (the second resonance frequency of the antenna in the muscle is 2.49GHz, the first resonance frequency of the antenna is 1.18GHz), one resonance is excited in fat (the first resonance frequency of the antenna in the fat is 2.46GHz), the antenna adopts the second resonance to cover the frequency band of ISM2.4GHz in the muscle, and adopts the first resonance frequency to cover the frequency band of ISM2.4GHz for working, so that the frequency band of ISM2.4GHz is covered in the muscle, human tissues with parameters similar to the medium parameters of the muscle and the fat with parameters obviously different from the medium parameters of the muscle; in addition, the antenna of this application embodiment is the double-deck metal structure of printing on the thick substrate of 70um, needs the welding to match the original paper, has the advantage that ultra-thin, flexibility, bending are good, easily processing.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a structural diagram of an implanted antenna applied to an ISM band according to an embodiment of the present application;
fig. 2(a) is a schematic diagram of the dimensional parameters of the upper surface of the implanted antenna applied to the ISM band according to the embodiment of the present application;
fig. 2(b) is a schematic diagram of the dimensional parameters of the lower surface of the implanted antenna applied to the ISM band according to the embodiment of the present application;
fig. 2(c) is a schematic thickness diagram of a dielectric substrate of an implanted antenna applied to ISM band according to an embodiment of the present application;
FIG. 3 is a side view of an antenna simulation environment provided by an embodiment of the present application;
FIG. 4 is a simulation curve of the reflection coefficient of the antenna in muscle and fat according to the embodiment of the present application;
fig. 5 is a structural diagram of a reference antenna ANT1 according to an embodiment of the present disclosure;
fig. 6 is a graph of reflection coefficients of an antenna and an ANT1 antenna in fat according to an embodiment of the present disclosure;
fig. 7 is a graph of the reflection coefficient of an antenna and an ANT1 antenna in muscle according to an embodiment of the present disclosure;
FIG. 8 is a graph of the current distribution of the antenna of the embodiment of the present application at 2.4GHz in the muscle;
FIG. 9 is a graph of the current distribution of the antenna of the embodiment of the present application in fat at 2.4 GHz;
FIG. 10 is a graph of the reflection coefficient of the antenna in muscle according to the embodiment of the present application;
fig. 11 is a graph of the reflection coefficient of the antenna in fat according to the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
The embodiment of the application aims at the ISM2.4GHz (2.4-2.4835GHz) working frequency band, and the relative dielectric constant and the conductivity of different human tissues and organs in the frequency band are distinguished as follows: the relative dielectric constant of muscle is epsilonr53.57, conductivity σ 1.81S/m; relative dielectric constant ε of stomachr62.16, conductivity σ 2.21S/m; relative dielectric constant epsilon of small intestiner54.43, conductivity σ 3.17S/m; relative dielectric constant epsilon of skinr38.01, conductivity σ 1.46S/m; relative dielectric constant ε of fatrThe conductivity σ was 0.1S/m, 5.28. In which the medium parameters of fat differ greatly from other tissues.
Most of the existing implanted antennas are designed in muscles or skins and are suitable for working on materials with relatively close medium parameters, and most of the existing antennas can work in the muscles, the skins and the gastrointestinal tracts. Since the dielectric parameters of fat differ considerably from the aforementioned tissue, the antenna cannot cover the operating band in fat. In the actual human body structure, the muscle is very close to the fat, and the implantation position of the antenna is difficult to control the muscle or the fat.
In order to solve the technical problem, the embodiment of the application designs a small implanted antenna, the implanted position comprises fat and muscle, and the antenna can cover ISM2.4GHz frequency band in two human tissues.
The implanted antenna of the embodiment of the application comprises two metal strips with a loop structure, two resonances can be excited in muscles (the second resonance frequency of the antenna in the muscles is 2.49GHz, the first resonance frequency of the antenna is 1.18GHz), one resonance is excited in fat (the first resonance frequency of the antenna in the fat is 2.46GHz), the antenna adopts the second resonance to cover the frequency band of ISM2.4GHz in the muscles, and adopts the first resonance frequency to cover the frequency band of ISM2.4GHz in the fat, so that the frequency band of ISM2.4GHz can be covered in the muscles, human tissues with parameters similar to the medium parameters of the muscles and the fat with the parameters obviously different from the medium parameters of the muscles.
After introducing the application scenario and the design concept of the embodiment of the present application, the following describes a technical solution provided by the embodiment of the present application.
As shown in fig. 1, an embodiment of the present application provides an implanted antenna applied to an ISM band, including: the dielectric substrate 100 is printed with two metal strips of a square-wave shape on the upper surface of the dielectric substrate 100: a first loop metal strip 201 and a second loop metal strip 202. The first metal strip 201 is bent and rotated 1.5 times in a clockwise direction, and the second metal strip 202 is bent and rotated 2 times in a counterclockwise direction. The two metal strips are bent in a shape of a circle, so that the miniaturization of the antenna can be realized, the coupling effect between the metal strips can be increased, and the bandwidth of the antenna is widened.
A rectangular metal sheet 300 is printed on a portion of the lower surface of the dielectric substrate 100 as a floor.
A feeder line is printed on the dielectric substrate 100 along one long side, and the first loop metal strip 201 is supplied with power through the feeder line. In order to obtain good impedance matching, the feeder is designed in a stepped shape of different widths. The feeder line of the antenna consists of three microstrip lines with different widths: a first feed line 204, a second feed line 205 and a third feed line 206, the design of the feed line portions significantly improves the impedance matching performance of the antenna. The feeding point is disposed between the first feeding line 204 and the rectangular metal sheet 300. The third feeding line 206 is connected to the first loop metal strip 201.
The size of the antenna components has an effect on the antenna bandwidth and needs to be optimally designed. As shown in fig. 2(a), 2(b) and 2(c), the optimal parameter sizes of the antenna are (unit in mm):
width of the dielectric substrate 100: w is 2, the length of the dielectric substrate 100: l is 7, and the thickness h of the dielectric substrate 100 is 0.07;
the total width of the first metal strip loop 201 is 2mm, the maximum length l2 of the first metal strip loop is 1.4, and the length l6 of the last section of the first metal strip loop is 0.7;
the total width w1 of the second loop-shaped metal strip 202 is 1.5, and the maximum length l3 is 3.7;
length of the first feeder 204: l4 ═ 1.5, width: k is 0.4;
length of the second feeder 205: l5 ═ 3.9, width: g is 0.1;
length of the third feeder line 206: 1.6, width: s is 0.3;
length of rectangular metal sheet 300: l1 ═ 1.6, width: w is 2.
The material of the dielectric substrate 100 is selected from flexible materials, and preferably, the material is polyimide.
Because human tissue has the electric conductivity, in order to prevent antenna and human tissue direct contact and short circuit, the antenna skin need wrap up 13um thick plastic film.
The simulation environment of the antenna is shown in fig. 3, and the human tissue antenna is simulated by a cube model with the size of 50mm x 50mm and is arranged at the center of the human tissue model. When designing an antenna in a muscle, the inside of the manikin is set to the medium parameters of the muscle. When designing an antenna in fat, the inside of the phantom is set to the medium parameters of the fat. The antenna is suitable for being implanted into a needle tube, is easy to conform to human tissues and has less harm to human bodies; meanwhile, the tissue covering device is suitable for muscle and adipose tissues, can cover ISM2.4GHz frequency bands in the two tissues, and is wide in application range.
The simulation curve of the reflection coefficient of the antenna in muscle and fat is shown in fig. 4. When the antenna works in the muscle, the second resonant frequency is 2.49GHz, -10dB bandwidth is 2.28GHz-2.67GHz, and ISM2.4GHz frequency band is covered; the first resonant frequency of the antenna is 1.18GHz, the bandwidth is 1.05GHz-1.29GHz, and the first resonance is not used for ISM operation. When the antenna works in fat, the first resonant frequency of the antenna is 2.46GHz, the-10 dB bandwidth is 2.37GHz-2.53GHz, and the antenna covers the ISM2.4GHz frequency band.
Various performances of the antenna are simulated below.
(1) Effect of the first loop metal strip 201 on antenna Performance
When the antenna does not contain the first loop metal strip 201, the antenna works with the first resonance in fat, and the ISM2.4GHZ frequency band is covered. The second resonance frequency in the muscle is higher than 2.4 GHz. The effect of the first loop 201 is therefore to reduce the second resonant frequency of the antenna in the muscle to around 2.4GHz, with a bandwidth covering ism2.4 GHz.
Fig. 5 shows a schematic diagram of a reference antenna ANT1, which does not include the first loop metal strip 201. As can be seen from fig. 6, the reflection coefficient of the antenna of the embodiment of the present application is substantially the same as that of the reference antenna ANT1 below 4GHz in fat, which indicates that the presence or absence of the first loop metal strip 201 when in fat has no influence on the bandwidth of the antenna around 2.4 GHz.
As can be seen from fig. 7, the first resonant frequency of the antenna of the embodiment of the present application is substantially the same as the first resonant frequency of the reference antenna ANT1, while the second resonant frequency differs in the muscle. The second resonant frequency of the reference antenna ANT1 is higher than that of the present embodiment, i.e. adding the first loop 201 lowers the second resonant frequency.
According to the current distribution diagrams of fig. 8 and 9, the implanted antenna of the embodiment of the present application has a current distribution in all portions of the first loop metal strip 201 when the implanted antenna is in the muscle, and the current distribution in the first loop metal strip 201 is very weak when the implanted antenna is in the fat. Thus, the structure of the first loop metal strip 201 has no influence on the bandwidth of the antenna when the antenna is in fat, and the structure of the first loop metal strip 201 has influence on the bandwidth of the antenna when the antenna is in muscle. By adding the first loop metal strip 201 in the antenna, the current distribution path of the antenna in the muscle is increased, and the resonant frequency is reduced. In fat and muscle, the current is distributed on the structure of the second loop-shaped metal strip 202, which shows that the structure of the second loop-shaped metal strip 202 has an influence on the bandwidth of the antenna in both muscle and fat.
(2) Effect of the second feed line 205 portion on antenna Performance
As can be seen from fig. 10, in the muscle, the value of the width g of the second power feed line 205 has a significant influence on the second resonant frequency and the bandwidth of the antenna of the embodiment of the present application, and g ═ 0.1mm can ensure that the antenna has the widest bandwidth around ism2.4ghz.
As can be seen from fig. 11, the value of the width g of the second feed line 205 in fat has no significant effect on the first resonant frequency and bandwidth of the antenna. When g is 0.4mm, the width of the first feed line 204 is the same as that of the second feed line 205, and the bandwidth of the antenna in fat is narrow, so that the antenna cannot cover ism2.4ghz. Therefore, the size and the shape of each part of the antenna need to be optimized and designed to cover ISM2.4GHz in both muscle and fat, and a wider bandwidth is obtained.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An implanted antenna for use in the ISM band, comprising: the dielectric substrate (100) is provided with a first metal strip (201) and a second metal strip (202) which are connected in a printing mode on the upper surface of the dielectric substrate (100); printing a rectangular metal sheet (300) at the end part of the lower surface of the medium substrate (100); printing a feeder line on the medium substrate (100) along one long side, and supplying power to the first metal strip (201) through the feeder line; a feeding point is provided between an end of the feeding line and the rectangular metal sheet (300).
2. The implanted antenna applied to the ISM band of claim 1, wherein the first loop metal strip (201) is bent clockwise for 1.5 turns.
3. The implanted antenna applied to the ISM band of claim 1, wherein the second loop-shaped metal strip (202) is bent 2 turns in a counter-clockwise direction.
4. The implanted antenna applied to the ISM band of claim 1, wherein the feed line is composed of a first feed line (204), a second feed line (205), and a third feed line (206) of three different widths; the feeding point is arranged between the first feeding line (204) and the rectangular metal sheet (300); the third feed line (206) is connected with the first return metal strip (201).
5. The implanted antenna applied to the ISM band of claim 4, wherein the first feed line (204) is 0.4mm wide; the width of the second feeder line (205) is 0.1 mm; the third feed line (206) is 0.3mm wide.
6. Implanted antenna for application in the ISM band according to claim 1, characterized in that the material of the dielectric substrate (100) is polyimide.
7. The implantable antenna applied to the ISM band of claim 1, wherein the outer layer of the antenna is wrapped by a plastic film 13um thick.
8. Implanted antenna applied in the ISM band according to claim 1, characterized in that said dielectric substrate (100) is rectangular and has dimensions: 7 mm. times.2 mm. times.70 um.
9. The implanted antenna applied to the ISM band of claim 8, characterized in that the total width of the first loop metal strip (201) is 2 mm; the maximum length of the first metal strip (201) is 1.4mm, and the length of the last section of the first metal strip (201) is 0.7 mm; the total width of the second clip metal strip (202) is 1.5mm, and the maximum length of the second clip metal strip (202) is 3.7 mm.
10. Implanted antenna applied in the ISM band according to claim 8, characterized in that the dimensions of the rectangular metal sheet (300) are 1.6mm x 2 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111450498.8A CN114142225B (en) | 2021-12-01 | 2021-12-01 | Be applied to implantation antenna of ISM frequency channel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111450498.8A CN114142225B (en) | 2021-12-01 | 2021-12-01 | Be applied to implantation antenna of ISM frequency channel |
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| CN114142225A true CN114142225A (en) | 2022-03-04 |
| CN114142225B CN114142225B (en) | 2023-11-03 |
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| CN114142225B (en) | 2023-11-03 |
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