CN109301475B - Miniaturized broadband flexible implantable antenna - Google Patents
Miniaturized broadband flexible implantable antenna Download PDFInfo
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- CN109301475B CN109301475B CN201811356090.2A CN201811356090A CN109301475B CN 109301475 B CN109301475 B CN 109301475B CN 201811356090 A CN201811356090 A CN 201811356090A CN 109301475 B CN109301475 B CN 109301475B
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- rectangular groove
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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Abstract
The application discloses a miniaturized broadband flexible implantable antenna, which comprises a dielectric substrate, a radiation unit, a microstrip feeder line, a first grounding surface and a second grounding surface, wherein the dielectric substrate is arranged on the first grounding surface; a radiating unit, a microstrip feeder line, a first grounding surface and a second grounding surface are printed on one surface of the dielectric substrate; the radiation unit is connected with the microstrip feeder line; the microstrip feeder line is connected with the bottom edge of the dielectric substrate; the first grounding surface and the second grounding surface are respectively positioned at the left side and the right side of the microstrip feeder, and the distance between the first grounding surface and the microstrip feeder is the same as the distance between the second grounding surface and the microstrip feeder; the top edge of the radiation unit is downwards provided with a first rectangular groove, a second rectangular groove and a third rectangular groove in sequence from left to right, the inside of the radiation unit is provided with an L-shaped groove, and the right lower corner of the radiation unit is provided with a fourth rectangular groove. The antenna adopts a coplanar waveguide structure, the radiating unit and the ground plane are coplanar, and the ground plane is positioned below the radiating unit, so that the thickness of the antenna is effectively reduced, and the volume of the antenna is further reduced.
Description
Technical Field
The application belongs to the field of antennas, and particularly relates to a miniaturized broadband flexible implanted antenna.
Background
In the 21 st century, health problems have become a major concern because of the ever-increasing population aging, the rapid development of economies and the significant improvement in quality of life. The medical service quality is required to be higher, the mobile medical treatment is brought into the field of view of people, the implantable device plays a vital role in the mobile medical treatment, the implantable device not only provides more convenient medical service for patients, but also improves the diagnosis and treatment work efficiency of medical workers, and the key of the implantable electronic device is how to realize the interaction of in-vivo signals and in-vitro devices, so that the importance of the implantable antenna is highlighted. Currently, wideband, miniaturized implantable antennas have become a research hotspot for implantable devices.
The federal communications commission in 1999 established an implantable medical band, the unlimited medical services (MICS) band, in the frequency range of 402-405MHz. 402-405MHz is also released as a biomedical telemetry special frequency band in 2007 in China. Current research on wireless medical devices is also focused mainly on this frequency band, and also involves 433.1-434.8MHz, 868-868.6MHz, 2.40-2.483GHz and 5.725-5.850GHz and ultra wideband frequencies 3.1GHz-10.6GHz in the industrial, scientific and medical frequency bands (abbreviated ISM).
For an implantable antenna, the antenna is more common in ISM frequency band, and compared with MICS and WMTS, the antenna has wider available frequency band and higher wireless channel capacity, so in recent years, in many countries, ISM frequency band of 5.8GHz is used for bio-telemetry; in the aspect of implantation means, the antenna can be placed at a part to be monitored through operation, and can be bent to be manufactured into a capsule antenna, so that the application value of the antenna is improved. For example, in the document Rectenna Application of Miniaturized Implantable Antenna Design for Triple-Band Biotelemetry Communication issued by Huang et al, a spiral implanted antenna is designed by using an antenna with a planar inverted F structure, and the number of layers of the antenna reaches four although the length and width are smaller, the thickness is overlarge, and the overall size is 10mm multiplied by 2.54mm; wu Zetao et al in the published research of implantable human body antennas for ambulatory medical treatment designed a wideband implantable antenna, and by combining a microstrip antenna and an inverted-F antenna, a short-circuit probe is loaded to increase the bandwidth, but the thickness of the antenna is increased and the processing difficulty is also increased. The document with application number 201520033739.2 discloses a fractal implantable antenna working in MICS frequency band, which adopts a 4-order Hilbert curve structure, meanwhile, a differential feed copper column is used, the structure is complex, the processing difficulty is greatly increased, meanwhile, the bandwidth of the antenna is 372-449MHz, the bandwidth is only 77MHz, the bandwidth is too small, the antenna is influenced by human tissues, the center frequency of the antenna can be offset, the antenna is not in the bandwidth, and the performance of the antenna is influenced. Therefore, the design of the broadband ultrathin implantable antenna with simple structure and small size has great significance.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide a miniaturized broadband flexible implanted antenna.
The technical scheme for solving the technical problems is that a miniaturized broadband flexible implantable antenna is provided, and is characterized by comprising a dielectric substrate, a radiating unit, a microstrip feeder line, a first grounding surface and a second grounding surface; a radiating unit, a microstrip feeder line, a first grounding surface and a second grounding surface are printed on one surface of the dielectric substrate; the radiation unit is connected with the microstrip feeder line; the microstrip feeder line is connected with the bottom edge of the dielectric substrate; the radiating unit is positioned at the top of the dielectric substrate, and the microstrip feeder line, the first grounding surface and the second grounding surface are all positioned below the radiating unit; the first grounding surface and the second grounding surface are respectively positioned at the left side and the right side of the microstrip feeder, and the distance between the first grounding surface and the microstrip feeder is the same as the distance between the second grounding surface and the microstrip feeder;
a first rectangular groove, a second rectangular groove and a third rectangular groove are sequentially formed from left to right along the top edge of the radiation unit, an L-shaped groove is formed in the radiation unit, and a fourth rectangular groove is formed in the lower right corner of the radiation unit; the first rectangular groove, the second rectangular groove, the third rectangular groove, the L-shaped groove and the fourth rectangular groove are not communicated.
Compared with the prior art, the application has the beneficial effects that:
1. the antenna adopts a coplanar waveguide structure, the radiating unit and the ground plane are coplanar, the ground plane is positioned below the radiating unit and at the two sides of the microstrip feeder line, so that the thickness of the antenna is effectively reduced, and the volume of the antenna is further reduced.
2. Different rectangular grooves and L-shaped grooves are formed in different positions of a radiation unit through a slot loading technology, an asymmetric brand new structure is designed, the antenna obtains broadband characteristics, the actual bandwidth of the antenna is 3.8-9.6GHz, the relative bandwidth reaches 100%, the broadband is realized relative to the working bandwidth of the antenna, the broadband can enable the center frequency to stably work in the bandwidth, the influence of the complex tissue environment of a human body on the performance of the antenna is reduced, the return loss of the antenna at the center frequency reaches-24.7 dB, and meanwhile, the voltage standing wave ratio of the antenna in the whole bandwidth is smaller than 2.
3. The dielectric substrate is made of polyimide flexible material with a dielectric constant of 3.5 and a thickness of 0.15mm, so that the antenna is easier to bend and achieves good implantation effect.
4. The antenna can be applied to muscle tissues, and the dielectric substrate is made of polyimide flexible materials with biocompatibility, so that the antenna is easier to bend, and meanwhile, the damage to human bodies caused by direct contact of the radiating unit and human tissues can be avoided.
5. The antenna tunes the center frequency of the antenna by adjusting the sizes of the rectangular grooves at the three tops, the L-shaped groove and the rectangular groove at the right lower corner of the radiating unit, and simultaneously, the broadband operation of the antenna is realized by a slot loading method.
6. The antenna has the advantages of simple structure, small size and easy processing, and meets engineering requirements.
Drawings
FIG. 1 is a schematic elevational view of one embodiment of the present application. ( In the figure: 1. a dielectric substrate; 2. a radiation unit; 3. a microstrip feed line; 4. a first ground plane; 5. second ground plane )
Fig. 2 is a graph of return loss of the antenna of example 1 of the present application in muscle tissue at a frequency of 5.8GHz.
Fig. 3 is a graph showing the voltage standing wave ratio of the antenna of example 1 of the present application in muscle tissue at a frequency of 5.8GHz.
Fig. 4 is a radiation pattern of the antenna of example 1 of the present application in muscle tissue at a frequency of 5.8GHz.
Detailed Description
Specific examples of the present application are given below. The specific examples are provided only for further details of the present application and do not limit the scope of the claims.
The application provides a miniaturized broadband flexible implantable antenna (called an antenna for short, see figure 1), which is characterized by comprising a dielectric substrate 1, a radiating unit 2, a microstrip feeder 3, a first grounding surface 4 and a second grounding surface 5; a radiating unit 2, a microstrip feeder line 3, a first grounding surface 4 and a second grounding surface 5 are printed on one surface of the dielectric substrate 1; the radiation unit 2 is connected with the microstrip feeder line 3; the microstrip feeder line 3 is connected with the bottom edge of the dielectric substrate 1; the first grounding surface 4 is not connected with the second grounding surface 5, the first grounding surface 4 is not connected with the radiating unit 2 and the microstrip feeder 3, and the second grounding surface 5 is not connected with the radiating unit 2 and the microstrip feeder 3; the radiating unit 2 is positioned at the top of the dielectric substrate 1, and the microstrip feeder 3, the first grounding surface 4 and the second grounding surface 5 are all positioned below the radiating unit 2; the first grounding surface 4 and the second grounding surface 5 are respectively positioned at the left side and the right side of the microstrip feeder 3, and the distances between the first grounding surface 4 and the second grounding surface 5 and the microstrip feeder 3 are the same;
three rectangular grooves (a first rectangular groove 21, a second rectangular groove 22 and a third rectangular groove 23) are sequentially formed from left to right along the top edge of the radiation unit 2, an L-shaped groove 24 is formed in the radiation unit 2, and a rectangle is cut off from the right lower corner of the radiation unit 2 to form a fourth rectangular groove 25; the first rectangular groove 21, the second rectangular groove 22, the third rectangular groove 23, the L-shaped groove 24 and the fourth rectangular groove 25 are not communicated;
preferably, the first rectangular groove 21, the second rectangular groove 22 and the third rectangular groove 23 are not the same size; the ratio of the widths of the first rectangular groove 21 to the second rectangular groove 22 to the third rectangular groove 23 is 4:3:5, the ratio of the lengths of the first rectangular groove 21 to the second rectangular groove 22 to the third rectangular groove 23 is 3:5:7, preparing a base material;
preferably, the L-shaped groove 24 is opened below the first rectangular groove 21, and the width thereof is the same as the width of the first rectangular groove 21; the L-shaped groove 24 is composed of a rectangle in the vertical direction and a rectangle in the horizontal direction;
preferably, the ratio of the length to the width of the fourth rectangular groove 25 is 2:1, a step of;
preferably, the material of the dielectric substrate 1 is a polyimide flexible material with biocompatibility, and the relative dielectric constant is 3.5.
Preferably, the radiating element 2, the microstrip feeder 3, the first ground plane 4 and the second ground plane 5 are all rectangular metal patches;
preferably, the midline of the microstrip feed line 3 is collinear with the midline of the radiating element 2.
Example 1
In this embodiment, the dielectric substrate 1 is rectangular parallelepiped, and the material used is polyimide which is a flexible material having biocompatibility, the relative dielectric constant is 3.5, and the dimensions of the dielectric substrate 1 are 7.84mm×7mm×0.15mm.
The radiating element 2 is a rectangular metal patch of 4.5mm by 6.5mm placed 0.25mm from the left side of the dielectric substrate 1 and 0.25mm from the top side of the dielectric substrate 1.
Three rectangular grooves of different sizes are cut down in order from left to right along the top of the radiation unit 2, wherein the first rectangular groove 21 has a size of 1.5mm×0.4mm, the second rectangular groove 22 has a size of 2.5mm×0.3mm, and the third rectangular groove 23 has a size of 3.5mm×0.5mm; the first rectangular groove 21 is 1.2mm away from the left side of the radiation unit 2 and 0.25mm away from the top edge of the dielectric substrate 1; the distance between the second rectangular groove 22 and the first rectangular groove 21 is 1.2mm, and the distance between the second rectangular groove 22 and the top edge of the medium substrate 1 is 0.25mm; the third rectangular slot 23 is 1.2mm from the second rectangular slot 22, 0.25mm from the top edge of the dielectric substrate 1, and 1.7mm from the right side of the radiation unit 2.
The L-shaped groove 24 is positioned right below the first rectangular groove 21 with an interval of 0.25mm and is 1.2mm away from the left side of the radiating unit 2, the L-shaped groove 24 is composed of a rectangle in the vertical direction and a rectangle in the horizontal direction, the rectangle in the vertical direction has a size of 2mm multiplied by 0.4mm, and the rectangle in the horizontal direction has a size of 2.4mm multiplied by 0.4mm; the horizontal rectangle is 0.75mm from the bottom side of the radiating element 2.
The fourth rectangular groove 25 cut at the right lower corner of the radiation unit 2 has a size of 1mm×0.5mm, the wide side is cut on the right side of the radiation unit 2, and the long side is 4.25mm away from the top side of the medium substrate 1;
the microstrip feed line 3 has dimensions of 3.5mm x 0.5mm, wherein the line is on the same line as the center line of the radiating element 2, 3.25mm from the left side of the dielectric substrate 1, and is connected to the bottom side of the dielectric substrate 1.
The first grounding surface 4 and the second grounding surface 5 are 3.09mm multiplied by 2mm in size, and the distance L between the first grounding surface and the microstrip feeder line 3 is 0.16mm; the distance from the radiating element 2 was 0.99mm.
Firstly, cutting three rectangular grooves with increased length at the top of the radiation unit 2 in sequence, wherein the length is increased to 1mm, and the center frequency is 6.05GHz; secondly, cutting a fourth rectangular groove 25 at the right lower corner of the radiation unit 2 to tune the center frequency to 5.9GHz; finally, an L-shaped slot 24 is formed, and the center frequency of the antenna is 5.8GHz.
Fig. 2 is a return loss curve of the antenna in the muscle tissue with the frequency of 5.8GHz, the dielectric constant of human muscle is 49.54 and the conductivity is 4.04 at the working frequency point of 5.8GHz, and as can be seen from fig. 2, the return loss of the antenna in the frequency band of 3.28-9.6GHz is less than-10 dB, so that a wide frequency band is realized. The antenna works in human tissues, the actual bandwidth of the antenna is reduced or offset due to the complex tissue environment, so that the center frequency is not in the bandwidth, and the performance of the antenna is further affected.
Fig. 3 is a voltage standing wave ratio curve of the antenna in the muscle tissue with the frequency of 5.8GHz, and it can be seen from the graph that the voltage standing wave ratio of the antenna is less than 2 in the frequency band with the return loss less than-10 dB, so as to meet the engineering requirement.
Fig. 4 is a radiation pattern of the antenna of the present embodiment in muscle tissue with a frequency of 5.8GHz, where E refers to an electric field and H refers to a magnetic field, and it can be seen from the figure that the radiation pattern of the antenna of the present embodiment is approximately a dipole (composed of two monopoles) radiation pattern, which illustrates that the radiation mechanism of the wideband antenna is a monopole radiation mechanism, and the antenna has a good radiation characteristic, and meets engineering requirements.
The application is applicable to the prior art where it is not described.
Claims (7)
1. The miniaturized broadband flexible implantable antenna is characterized by comprising a dielectric substrate, a radiation unit, a microstrip feeder line, a first grounding surface and a second grounding surface; a radiating unit, a microstrip feeder line, a first grounding surface and a second grounding surface are printed on one surface of the dielectric substrate; the radiation unit is connected with the microstrip feeder line; the microstrip feeder line is connected with the bottom edge of the dielectric substrate; the radiating unit is positioned at the top of the dielectric substrate, and the microstrip feeder line, the first grounding surface and the second grounding surface are all positioned below the radiating unit; the first grounding surface and the second grounding surface are respectively positioned at the left side and the right side of the microstrip feeder, and the distance between the first grounding surface and the microstrip feeder is the same as the distance between the second grounding surface and the microstrip feeder;
a first rectangular groove, a second rectangular groove and a third rectangular groove are sequentially formed from left to right along the top edge of the radiation unit, an L-shaped groove is formed in the radiation unit, and a fourth rectangular groove is formed in the lower right corner of the radiation unit; the first rectangular groove, the second rectangular groove, the third rectangular groove, the L-shaped groove and the fourth rectangular groove are not communicated.
2. The miniaturized broadband flexible implantable antenna according to claim 1, wherein the first rectangular slot, the second rectangular slot, and the third rectangular slot are not the same size; the ratio of the widths of the first rectangular groove to the second rectangular groove to the third rectangular groove is 4:3:5, the ratio of the lengths of the first rectangular groove to the second rectangular groove to the third rectangular groove is 3:5:7.
3. the miniaturized broadband flexible implantable antenna according to claim 1, wherein the L-shaped slot is formed below the first rectangular slot and has the same width as the first rectangular slot; the L-shaped groove consists of a rectangle in the vertical direction and a rectangle in the horizontal direction.
4. The miniaturized broadband flexible implantable antenna according to claim 1, wherein the ratio of length to width of the fourth rectangular slot is 2:1.
5. the miniaturized broadband flexible implantable antenna according to claim 1, wherein the dielectric substrate is made of a biocompatible polyimide flexible material having a relative dielectric constant of 3.5.
6. The miniaturized broadband flexible implantable antenna according to claim 1, wherein said radiating element, microstrip feed line, first ground plane and second ground plane are rectangular metal patches.
7. The miniaturized broadband flexible implantable antenna according to claim 1, wherein the centerline of the microstrip feed line is collinear with the centerline of the radiating element.
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| CN201811356090.2A CN109301475B (en) | 2018-11-14 | 2018-11-14 | Miniaturized broadband flexible implantable antenna |
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| CN201811356090.2A CN109301475B (en) | 2018-11-14 | 2018-11-14 | Miniaturized broadband flexible implantable antenna |
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| CN109301475B true CN109301475B (en) | 2023-09-12 |
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| CN110620294A (en) * | 2019-10-16 | 2019-12-27 | 成都奥特为通讯有限公司 | Conformal low-profile dual-frequency WiFi antenna and equipment |
| CN114597646B (en) * | 2022-04-11 | 2023-07-18 | 湖南迈克森伟电子科技有限公司 | Radiation unit |
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