CN116130924A - Miniaturized dual-frenquency circular polarization flexible implanted antenna - Google Patents
Miniaturized dual-frenquency circular polarization flexible implanted antenna Download PDFInfo
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- CN116130924A CN116130924A CN202310074327.2A CN202310074327A CN116130924A CN 116130924 A CN116130924 A CN 116130924A CN 202310074327 A CN202310074327 A CN 202310074327A CN 116130924 A CN116130924 A CN 116130924A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/08—Means for collapsing antennas or parts thereof
- H01Q1/085—Flexible aerials; Whip aerials with a resilient base
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/273—Adaptation for carrying or wearing by persons or animals
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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
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- 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
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- 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
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- 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
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention provides a miniaturized dual-frequency circularly polarized flexible implantable antenna, which comprises: the device comprises a dielectric substrate and a covering layer, wherein the covering layer is positioned at the top of the dielectric substrate; the radiation surface is printed on the top of the medium substrate, the ground plane is printed on the bottom of the medium substrate, the radiation surface is communicated with the ground plane through a short circuit probe and a coaxial feed center line, the radiation surface is connected with a coaxial feed center probe, the short circuit probe and the coaxial feed center line are symmetrically distributed with respect to the center of the medium substrate, and the cover layer is positioned on the top of the radiation surface. The miniaturized double-frequency circularly polarized flexible implanted antenna provided by the invention has the advantages of simple structure, convenience in installation, small size, low profile and large channel capacity.
Description
Technical Field
The invention relates to the field of antennas, in particular to a miniaturized double-frequency circularly polarized flexible implanted antenna.
Background
With the improvement of human living standard and the relatively stable international situation, the population aging problem of various countries in the world is becoming serious, and the demand of people for medical care service is also necessarily increased. Nowadays, china becomes the second major economy of the world, the life quality of people is obviously improved, and people put higher demands on the medical care service industry of China. The wireless biomedical equipment is utilized to improve the service level of the medical care industry, and is a main trend of the current and future development of the medical care service industry. At present, the wireless medical technology has a plurality of design problems to be solved and has wide application prospect, so that the wireless medical technology is focused by more and more domestic and foreign students. Ambulatory medical devices utilize wireless communication technology to improve medical service levels including telemedicine, appointment platforms, hospital information mobilization solutions, and the like. At present, research on implantable antennas by research teams at home and abroad has initially formed a theoretical system. The industrial, scientific and medical frequency bands (ISM for short, the main communication frequency bands comprise 433.1-434.8MHz,868-868.6MHz,902-928MHz,2.4-2.48GHz and 5.725-5.875 GHz) have the advantages of available frequency bandwidth, large channel capacity and the like, so that the terminal antenna of the implantable medical device is more common in covering the ISM frequency band. The implanted antenna can be implanted into the scalp, heart and other tissues of a person by utilizing operation, and can be bent and put into the capsule equipment to enter the interior of the human body by being swallowed by a patient. For miniaturized implantable antennas, various nationists have proposed different schemes such as inverted F antennas (PIFAs), slot antennas, fractal structure antennas, etc. The design of DesignandinVitronTestonafacifferentialyFedDual-Band ImplantableAntennaOperatingatMICSandISMBands designs a capacitively loaded circularly polarized antenna operating at 2.4GHz with dimensions of 10mm by 1.27mm, which has a relatively high profile and limited channel capacity; a capacitively loaded circular polarized antenna operating at 2.4GHz with dimensions of 10mm by 1.27mm is proposed in Designatory VitogestrafailyFedDual-Band ImplantableAntennaOperatingatMICSandISMBands, which has a relatively high profile and limited channel capacity; a compact dual-frequency implantable antenna with the size of 10mm multiplied by 1.27mm for biomedical treatment is proposed in coplanar waveguide feed dual-frequency implantable antenna for biomedical treatment, but the size and the section of the antenna are larger. The three antennas have the same size, have different radiation characteristics due to different radiation surface structures, and all have the problems of large plane size and high section. Therefore, the design of the dual-frequency circularly polarized implantable antenna with simple structure, small size, low section and large channel capacity has great significance.
Disclosure of Invention
The invention aims to provide a miniaturized double-frequency circularly polarized flexible implanted antenna which has the advantages of simple structure, convenient installation, small size, low section and large channel capacity.
In order to achieve the above object, the present invention provides the following solutions:
a miniaturized dual-band circularly polarized flexible implantable antenna comprising: the device comprises a dielectric substrate and a covering layer, wherein the covering layer is positioned at the top of the dielectric substrate;
the top of the medium substrate is printed with a radiation surface, the bottom of the medium substrate is printed with a ground plane, the radiation surface is communicated with the ground plane through a short circuit probe and a coaxial feed center line, the radiation surface is connected with a coaxial feed center probe, the short circuit probe and the coaxial feed center line are symmetrically distributed about the center of the medium substrate, and the cover layer is positioned at the top of the radiation surface;
the radiating surface is provided with a first T-shaped groove, a second T-shaped groove, a third T-shaped groove and a fourth T-shaped groove sequentially at the edge along the clockwise direction by taking the center of the top as the center of the circle, the center of the radiating surface is provided with a radiating surface cross-shaped groove, welding spots of a radiating surface short-circuit probe and welding spots of a radiating surface coaxial feed center line are symmetrically distributed about the center of the top of the radiating surface, the welding spots of the radiating surface short-circuit probe are connected with the short-circuit probe, and the welding spots of the radiating surface coaxial feed center line are connected with the coaxial feed center line;
the ground plane center is provided with a ground plane cross groove, ground plane short circuit probe welding spots and ground plane coaxial feed grounding ports are symmetrically distributed with respect to the ground plane bottom center, the ground plane short circuit probe welding spots are connected with the short circuit probe, and the ground plane coaxial feed grounding ports are connected with the coaxial feed center line.
Optionally, the first T-shaped groove is formed by two mutually perpendicular rectangular shapes with equal width, and the first T-shaped groove, the second T-shaped groove, the third T-shaped groove and the fourth T-shaped groove are identical and are not communicated with each other.
Optionally, the cross-shaped groove of the radiating surface is formed by two mutually perpendicular identical rectangles, the width of the rectangle is identical to that of the rectangle in the first T-shaped groove, two ends of the rectangle of the cross-shaped groove of the radiating surface face towards the center of the non-communicated part of the two adjacent T-shaped grooves, and the cross-shaped groove of the radiating surface is not communicated with the first T-shaped groove, the second T-shaped groove, the third T-shaped groove and the fourth T-shaped groove.
Optionally, the ground plane cross-shaped groove is formed by two mutually perpendicular identical rectangles, the width of the rectangle is identical to that of the rectangle in the radiation plane cross-shaped groove, and the rectangular orientation of the ground plane cross-shaped groove is identical to that of the radiation plane cross-shaped groove;
the length of the cross-shaped groove of the radiation surface and the length of the cross-shaped groove of the ground plane are 11:5..
Optionally, the dielectric substrate and the cover layer are made of polyimide flexible materials, and the relative dielectric constant is 10.2.
Optionally, the radiating surface and the ground plane are both circular metal patches, and the short-circuit probe and the coaxial feed center line are both metal cylinders.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the miniaturized double-frequency circularly polarized flexible implanted antenna provided by the invention adopts a coaxial feed structure, is convenient to install, and further reduces the volume of the antenna by utilizing a short-circuit probe; a symmetrical brand new structure is designed by a slot loading technology on an open T-shaped groove uniformly and symmetrically on a radiation surface and a cross-shaped groove uniformly and symmetrically on the radiation surface, so that the antenna obtains dual-frequency circular polarization characteristics, the actual impedance bandwidth of the antenna is 0.88-0.98GHz and 2.27-2.53GHz, the relative bandwidths respectively reach 10.75% and 10.83%, the dual-frequency broadband is realized relative to the working bandwidths of the antenna, 0.902-0.928GHz and 2.4-2.48GHz, the broadband can enable the central 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 in the central frequency respectively reaches-11.8 dB and-31.4 dB, and meanwhile, the voltage standing wave ratio of the antenna in the whole working bandwidth is smaller than 2. The 3dB axial ratio bandwidths are respectively 0.87-1.05GHz and 2.37-2.57GHz; the effective axial ratio bandwidths are respectively 0.88-0.98GHz and 2.37-2.53GHz, and the relative effective axial ratio bandwidths are 10.75% and 6.53%, so that the optical fiber has good circular polarization characteristics; the dielectric substrate and the cover layer are made of polyimide flexible materials with dielectric constants of 10.2, so that the antenna is easier to bend to achieve a good implantation effect, and meanwhile, the radiation surface can be prevented from being directly contacted with human tissues to cause harm to human bodies; tuning the center frequency of the antenna by adjusting the sizes of the four T-shaped grooves of the radiation surface, the cross-shaped groove of the radiation surface and the cross-shaped groove of the ground plane, so as to obtain a double-frequency characteristic; by adjusting the positions of the feed point and the shorting probe, the circularly polarized characteristic of the antenna is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a radiation surface structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a ground plane structure according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 4 is a graph of return loss of an antenna in three layers of skin, fat and muscle tissue at a frequency of 0.9GHz in an embodiment of the invention;
FIG. 5 is a graph of the 3dB axial ratio of an antenna in a skin, fat and muscle triple layer tissue at a frequency of 0.9GHz in an embodiment of the present invention;
FIG. 6 is a graph showing the amplitude distribution of radiation surface currents in skin, fat and muscle triple layer tissue at a frequency of 0.9GHz for an antenna according to an embodiment of the present invention;
FIG. 7 is a graph showing the amplitude distribution of radiation surface currents in skin, fat and muscle triple layer tissue at a frequency of 2.4GHz for an antenna in accordance with an embodiment of the present invention;
FIG. 8 is a radiation pattern of an antenna in three layers of skin, fat and muscle tissue at a frequency of 0.9GHz in an embodiment of the invention;
fig. 9 is a radiation pattern of an antenna in three layers of skin, fat and muscle tissue at a frequency of 2.4GHz in an embodiment of the invention.
Reference numerals: 1. a dielectric substrate; 2. a cover layer; 3. a radiation surface; 4. a first T-shaped slot; 5. a second T-shaped slot; 6. a third T-slot; 7. a fourth T-slot; 8. a radiating surface cross-shaped groove; 9. the radiation surface short-circuits the probe welding spots; 10. the radiating surface is coaxial with the feed center line welding spot; 11. ground plane short circuit probe welding spots; 12. ground plane coaxial feed ground port; 13. a ground plane cross-shaped groove; 14. a ground plane; 15. a shorting probe; 16. coaxial feed center line.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a miniaturized double-frequency circularly polarized flexible implanted antenna which has the advantages of simple structure, convenient installation, small size, low section and large channel capacity.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 3, a miniaturized dual-band circularly polarized flexible implantable antenna, comprising: the device comprises a dielectric substrate 1 and a covering layer 2, wherein the covering layer 2 is positioned on the top of the dielectric substrate 1;
the top of the dielectric substrate 1 is printed with a radiation surface 3, the bottom of the dielectric substrate 1 is printed with a ground plane 14, the radiation surface 3 is communicated with the ground plane 14 through a short circuit probe 15 and a coaxial feed center line 16, the radiation surface 3 is connected with a coaxial feed center probe, the short circuit probe 15 and the coaxial feed center line 16 are symmetrically distributed about the center of the dielectric substrate 1, and the cover layer 2 is positioned at the top of the radiation surface 3;
the radiating surface 3 is provided with a first T-shaped groove 4, a second T-shaped groove 5, a third T-shaped groove 6 and a fourth T-shaped groove 7 on the edge in sequence along the clockwise direction by taking the top center as the center of a circle, the center of the radiating surface 3 is provided with a radiating surface cross-shaped groove 8, a radiating surface 3 short-circuit probe welding spot 9 and a radiating surface coaxial feed center line welding spot 10 are symmetrically distributed about the top center of the radiating surface 3, the radiating surface 3 short-circuit probe welding spot 9 is connected with the short-circuit probe 15, and the radiating surface coaxial feed center line welding spot 10 is connected with the coaxial feed center line 16;
the center of the ground plane 14 is provided with a ground plane cross groove 13, the ground plane short circuit probe welding spot 11 and the ground plane coaxial feed grounding port 12 are symmetrically distributed around the center of the bottom of the ground plane 14, the ground plane short circuit probe welding spot 11 is connected with the short circuit probe 15, and the ground plane coaxial feed grounding port 12 is connected with the coaxial feed center line 16.
The first T-shaped groove 4 is formed by two mutually perpendicular equal-width rectangles, and the first T-shaped groove 4, the second T-shaped groove 5, the third T-shaped groove 6 and the fourth T-shaped groove 7 are identical and are not communicated with each other.
The cross-shaped groove 8 of the radiation surface is formed by two mutually perpendicular identical rectangles, the width of the rectangle is identical with that of the rectangle in the first T-shaped groove 4, the two ends of the rectangle of the cross-shaped groove of the radiation surface 3 face the center of the non-communicated part of the two adjacent T-shaped grooves, and the cross-shaped groove 8 of the radiation surface is not communicated with the first T-shaped groove 4, the second T-shaped groove 5, the third T-shaped groove 6 and the fourth T-shaped groove 7.
The ground plane cross-shaped groove 13 is formed by two mutually perpendicular identical rectangles, the width of each rectangle is identical to that of the rectangle in the radiation plane cross-shaped groove 8, and the rectangular orientation of the ground plane cross-shaped groove 13 is identical to that of the radiation plane 3 cross-shaped groove;
the length of the radiation surface cross groove 8 and the length of the ground plane cross groove 13 are 11:5..
The dielectric substrate 1 and the cover layer 2 are made of polyimide flexible materials, and the relative dielectric constant is 10.2.
The radiation surface 3 and the ground plane 14 are both circular metal patches, and the shorting probe 15 and the coaxial feed center line 16 are both metal cylinders.
One embodiment of the invention is:
the dielectric substrate 1 and the cover layer 2 are cylindrical, the material used is flexible material polyimide with biological compatibility, the relative dielectric constant is 10.2, and the plane size of the dielectric substrate 1 and the cover layer 2 is pi multiplied by 4.72mm 2 The section thickness was 0.625mm and 0.254mm, respectively.
As shown in fig. 1, four T-shaped grooves of the same size are cut out clockwise along the top of the radiation surface 3, the first T-shaped groove 4 has a horizontal rectangular groove size of 3.0mm×0.4mm, and the vertical rectangular groove has a vertical rectangular groove size of 2.3mm×0.4mm; the center of the radiation surface 3 is cut off a radiation surface cross groove 8, two rectangular grooves forming the radiation surface cross groove 8 are mutually perpendicular and have the same size of 4.0mm multiplied by 0.4mm, the rectangular two ends of the radiation surface 3 cross groove face to the center of the non-communicated position of the two adjacent T-shaped grooves, and the vertex of the symmetry axis of the rectangular groove of the radiation surface cross groove 8 is 2.7mm away from the edge of the radiation surface 3.
As shown in fig. 2, a ground plane cross slot 13 is cut in the center of the ground plane 14, two rectangular slots forming the ground plane cross slot 13 are perpendicular to each other and have the same size of 8.8mm x 0.4mm, the rectangular orientation of the ground plane cross slot 13 is the same as the rectangular orientation of the cross slot of the radiation surface 3, and the vertex of the symmetry axis of the rectangular slot of the ground plane cross slot 13 is 0.3mm away from the edge of the ground plane 14.
As shown in fig. 1, the center of the radiation surface short-circuit probe welding spot 9 is 0.8mm away from the x-axis, 4.0mm away from the y-axis, the radius is 0.15mm, and the center of the radiation surface coaxial feed central line welding spot 10 is 0.7mm away from the x-axis, and 4.0mm away from the y-axis; the radius of the coaxial feed centerline 16 is 0.2mm; as shown in fig. 2, the center of the ground plane coaxial feed ground port 12 is 0.7mm from the x-axis, 4.0mm from the y-axis, and the radius is 0.3mm, and the coaxial feed center line 16 is not in contact with the ground plane coaxial feed ground port 12;
firstly, uniformly and symmetrically cutting out a first T-shaped groove, a second T-shaped groove 5, a third T-shaped groove 6 and a fourth T-shaped groove 7 which are identical in size at the top of a radiation surface 3 in sequence to obtain double-frequency working characteristics; then a cross-shaped groove 88 of the central radiation surface is formed, and the antenna obtains circular polarization characteristics; finally, a ground plane cross-shaped groove 13 is formed in the ground plane 14 to optimize the impedance matching of the antenna.
Fig. 4 and fig. 5 are respectively a return loss curve and an axial ratio curve of the antenna in the three layers of skin, fat and muscle with the frequency of 0.9GHz, and it can be seen from fig. 4 that the return loss of the antenna in the frequency bands of 0.88-0.98GHz and 2.27-2.53GHz is less than-10 dB, so that a double-frequency broadband is realized; from FIG. 5, it can be seen that the antenna has an axial ratio of less than 3dB in the frequency bands of 0.87-1.05GHz and 2.37-2.53GHz, thereby realizing dual-frequency circular polarization. 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, but the antenna achieves a wide frequency band, the bandwidth is wide enough, the situation that the center frequency of the antenna is not in the bandwidth can be effectively avoided, the antenna has circular polarization characteristics, the influence of polarization mismatch on the communication quality can be reduced, and the antenna can stably work in the frequency bands of 0.902-0.928GHz and 2.4-2.48 GHz.
Fig. 6 is a graph showing the current amplitude distribution of the antenna of the present embodiment in three layers of skin, fat and muscle tissue at a frequency of 0.9GHz, and it can be seen from the graph that the current path is increased by opening the T-slot and adding the shorting probe 15, effectively reducing the size of the antenna.
Fig. 7 is a graph showing the current amplitude distribution of the antenna of the present embodiment in three layers of skin, fat and muscle tissue at a frequency of 2.4GHz, from which it can be seen that radiation is concentrated mainly near the closed rectangular slot of the T-slot at the frequency point of 2.4GHz by opening the T-slot.
Fig. 8 is a radiation pattern of the antenna of the present embodiment in three layers of skin, fat and muscle tissue with a frequency of 0.9GHz, where E denotes an electric field and H denotes a magnetic field, and it can be seen from the figure that the radiation pattern of the antenna of the present embodiment has a characteristic of being approximately omnidirectional, and meets engineering requirements.
Fig. 9 is a radiation pattern of the antenna of the present embodiment in three layers of skin, fat and muscle tissue with a frequency of 2.4GHz, where E denotes an electric field and H denotes a magnetic field, and it can be seen from the figure that the radiation pattern of the antenna of the present embodiment has a characteristic of being approximately omnidirectional, and meets engineering requirements.
The miniaturized double-frequency circularly polarized flexible implanted antenna provided by the invention adopts a coaxial feed structure, is convenient to install, and further reduces the volume of the antenna by utilizing a short-circuit probe; a symmetrical brand new structure is designed by a slot loading technology on an open T-shaped groove uniformly and symmetrically on a radiation surface and a cross-shaped groove uniformly and symmetrically on the radiation surface, so that the antenna obtains dual-frequency circular polarization characteristics, the actual impedance bandwidth of the antenna is 0.88-0.98GHz and 2.27-2.53GHz, the relative bandwidths respectively reach 10.75% and 10.83%, the dual-frequency broadband is realized relative to the working bandwidths of the antenna, 0.902-0.928GHz and 2.4-2.48GHz, the broadband can enable the central 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 in the central frequency respectively reaches-11.8 dB and-31.4 dB, and meanwhile, the voltage standing wave ratio of the antenna in the whole working bandwidth is smaller than 2. The 3dB axial ratio bandwidths are respectively 0.87-1.05GHz and 2.37-2.57GHz; the effective axial ratio bandwidths are respectively 0.88-0.98GHz and 2.37-2.53GHz, and the relative effective axial ratio bandwidths are 10.75% and 6.53%, so that the optical fiber has good circular polarization characteristics; the dielectric substrate and the cover layer are made of polyimide flexible materials with dielectric constants of 10.2, so that the antenna is easier to bend to achieve a good implantation effect, and meanwhile, the radiation surface can be prevented from being directly contacted with human tissues to cause harm to human bodies; tuning the center frequency of the antenna by adjusting the sizes of the four T-shaped grooves of the radiation surface, the cross-shaped groove of the radiation surface and the cross-shaped groove of the ground plane, so as to obtain a double-frequency characteristic; by adjusting the positions of the feed point and the shorting probe, the circularly polarized characteristic of the antenna is realized.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. A miniaturized dual-band circularly polarized flexible implantable antenna comprising: the device comprises a dielectric substrate and a covering layer, wherein the covering layer is positioned at the top of the dielectric substrate;
the top of the medium substrate is printed with a radiation surface, the bottom of the medium substrate is printed with a ground plane, the radiation surface is communicated with the ground plane through a short circuit probe and a coaxial feed center line, the radiation surface is connected with a coaxial feed center probe, the short circuit probe and the coaxial feed center line are symmetrically distributed about the center of the medium substrate, and the cover layer is positioned at the top of the radiation surface;
the radiating surface is provided with a first T-shaped groove, a second T-shaped groove, a third T-shaped groove and a fourth T-shaped groove sequentially at the edge along the clockwise direction by taking the center of the top as the center of the circle, the center of the radiating surface is provided with a radiating surface cross-shaped groove, welding spots of a radiating surface short-circuit probe and welding spots of a radiating surface coaxial feed center line are symmetrically distributed about the center of the top of the radiating surface, the welding spots of the radiating surface short-circuit probe are connected with the short-circuit probe, and the welding spots of the radiating surface coaxial feed center line are connected with the coaxial feed center line;
the ground plane center is provided with a ground plane cross groove, ground plane short circuit probe welding spots and ground plane coaxial feed grounding ports are symmetrically distributed with respect to the ground plane bottom center, the ground plane short circuit probe welding spots are connected with the short circuit probe, and the ground plane coaxial feed grounding ports are connected with the coaxial feed center line.
2. The miniaturized dual-band circularly polarized flexible implantable antenna according to claim 1, wherein the first T-slot is formed by two rectangular shapes of equal width perpendicular to each other, and the first T-slot, the second T-slot, the third T-slot and the fourth T-slot are identical and are not communicated with each other.
3. The miniaturized dual-band circularly polarized flexible implantable antenna according to claim 1, wherein the radiating surface cross-shaped slot is formed by two identical rectangles perpendicular to each other, the width of the rectangle is identical to that of the rectangle in the first T-shaped slot, the two ends of the rectangle of the radiating surface cross-shaped slot face the center of the non-communicated part of the two adjacent T-shaped slots, and the radiating surface cross-shaped slot is not communicated with the first T-shaped slot, the second T-shaped slot, the third T-shaped slot and the fourth T-shaped slot.
4. A miniaturized dual-frequency circularly polarized flexible implantable antenna according to claim 3, wherein said ground plane cross-shaped slot is formed by two mutually perpendicular identical rectangles, the width of the rectangle is identical to the width of the rectangle in said radiating plane cross-shaped slot, and the rectangular orientation of said ground plane cross-shaped slot is identical to the rectangular orientation of the radiating plane cross-shaped slot;
the length of the cross-shaped groove of the radiation surface and the length of the cross-shaped groove of the ground plane are 11:5..
5. The miniaturized dual-band circularly polarized flexible implantable antenna as claimed in claim 1, wherein the dielectric substrate and the cover layer are made of polyimide flexible material with a relative dielectric constant of 10.2.
6. A miniaturized dual-band circularly polarized flexible implantable antenna according to claim 3, wherein the radiating surface and the ground plane are circular metal patches, and the shorting probe and the coaxial feed center line are metal cylinders.
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CN202310074327.2A CN116130924A (en) | 2023-02-07 | 2023-02-07 | Miniaturized dual-frenquency circular polarization flexible implanted antenna |
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