CN110544824A - Square ring-shaped circularly polarized implanted antenna for wireless biomedical treatment - Google Patents
Square ring-shaped circularly polarized implanted antenna for wireless biomedical treatment Download PDFInfo
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- 230000005855 radiation Effects 0.000 claims abstract description 49
- 230000010287 polarization Effects 0.000 claims abstract description 33
- 230000002035 prolonged effect Effects 0.000 claims abstract description 6
- 239000000523 sample Substances 0.000 claims description 58
- 239000000758 substrate Substances 0.000 claims description 36
- 239000000560 biocompatible material Substances 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 238000004804 winding Methods 0.000 abstract description 3
- 238000002513 implantation Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000007943 implant Substances 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035790 physiological processes and functions Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009747 swallowing Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- 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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
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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
Abstract
3The invention discloses a square annular circularly polarized implanted antenna for wireless biomedical treatment, wherein rectangular grooves with the same size are formed on four sides of a square ring to form a winding structure, so that the surface current path of a radiation unit can be prolonged, and the size of the antenna is reduced. Eight triangular loading units are loaded in the middle of the square annular radiation patch, so that the effective capacitance and inductance distribution of unit length can be effectively increased, the propagation constant is increased, and the resonant frequency of the antenna is shifted to the low-frequency direction. And the gaps of the two groups of triangular loading units extend to the edges of the square rings to form an open circuit structure, and the two groups of triangular loading units are connected by a rectangular conduction band near the center position to generate geometric disturbance and generate circular polarization characteristics. The volume of the antenna is only 10 multiplied by 0.635mm3, the antenna has the characteristics of miniaturization, circular polarization, wide frequency band, interference resistance, good biological compatibility and the like, is suitable for WMTS 1.43GHz frequency band, and can meet the working requirement after being implanted into human tissues.
Description
Technical Field
The invention relates to the technical field of implanted antennas, in particular to a square-ring circularly polarized implanted antenna for wireless biomedical treatment, which is suitable for a WMTS (wireless transmit receive set) 1.43GHz circularly polarized implanted wireless biomedical device.
Background
At present, the population aging and sub-health population are continuously increased, and the population needs to be nursed through daily examination, surgical operation and state monitoring, but the cost of medical care is higher, and the wireless biological medical treatment technology can provide more efficient and convenient medical care service and has wide development prospect. The wireless biological medical treatment device is implanted into a human body by adopting methods such as swallowing or operation, can continuously monitor the metabolism level of the human body without considering the physiological state of a patient, provides accurate diagnosis and treatment information for a doctor, and can greatly reduce the pain of the patient. The wireless biomedical device is generally composed of a sensor, an antenna, a battery and the like, wherein the antenna is a core device of the implanted wireless biomedical device and is a bridge for transmitting human body state information. Since the electrical characteristics and structure of human tissue may vary with time and individual, the designed implanted antenna needs to have a small size, interference resistance, low power consumption, and biocompatibility. After the implanted antenna is implanted into a human body, the implanted antenna can move or rotate due to the movement of the human body, so that the external antenna cannot be aligned with the implanted antenna to finish communication. If the antenna is a linearly polarized antenna outside the body, the polarization mismatch between the implanted antenna and the antenna outside the body is caused by the change of the angle, thereby reducing the communication quality. The circularly polarized antenna can reduce the polarization characteristic requirement on the in-vitro linearly polarized antenna, can effectively solve the problem of polarization mismatch, and has the characteristics of reducing the error rate, reducing multipath interference and the like. However, designing an implantable circularly polarized antenna needs to meet various requirements of circular polarization, miniaturization, electromagnetic interference and compatibility, working bandwidth and frequency, biocompatibility, and the like, and designing an implantable circularly polarized antenna with excellent performance has certain challenges. The miniaturization method of the implanted antenna mainly comprises the steps of prolonging a current path, increasing the electric size, changing the structure of a dielectric substrate, adopting a high-dielectric-constant dielectric substrate, adopting a loading technology to increase an active network and the like. Non-patent document 1: a radiation unit is provided with grooves which form a certain angle with a long arm and are different in length, the design size of the antenna is reduced, a pair of open-circuit grooves are additionally arranged on a floor, the size of the antenna is further reduced, the antenna is conformal with the outer wall of a capsule, the circular polarization characteristic is generated, and the antenna has good polarization characteristic and impedance matching in a frequency range. Non-patent document 2: the utility model discloses a miniaturized implanted ring shape antenna comprises the ring in the middle of circular radiation paster and the outside, increases the rectangular channel in ring both sides and prolongs antenna surface current path, reduces the size of antenna, increases two minor matters in the inboard of antenna ring radiation paster, thereby produces the circular polarization characteristic of how much perturbation, opens a Z-shaped groove in the middle of the circular radiation paster of middle, improves the impedance matching of antenna and promotes circular polarization purity. The same medium substrate is added on the top of the radiation unit to prevent the radiation patch from directly contacting with the human body, and meanwhile, the medium substrate can also be used as a buffer between human body tissues and the radiation patch.
List of cited documents
Non-patent document 1: das R, Yoo H. A Wireless and cyclic poled systematic antenna system for high-speed data transfer [ J ]. IEEE Antennas and Wireless Propagation Letters,2017,65(6): 2816) 2826.
non-patent document 2: li R, Guo Y.X., Zhang B, et al.A. finely polarized implantable annular-ring antenna [ J ]. IEEE Antennas and Wireless deployment Letters,2017,16: 2566-.
Disclosure of Invention
The invention aims to provide a square-ring circularly polarized implanted antenna for wireless biomedical treatment, which has the characteristics of circular polarization, wide frequency band, interference resistance, miniaturization, excellent biocompatibility and the like, is easy to integrate into an implanted wireless biomedical device, is suitable for WMTS (Wireless Telecommunications System) 1.43GHz frequency band, and can meet the working requirement after being implanted into human tissues.
The technical scheme of the invention is as follows: a square ring circular polarization implanted antenna for wireless bio-medical treatment comprises medium base plate 1, square ring radiation paster 2, short circuit probe 3, short circuit probe 4, coaxial joint 5, floor 6, its characterized in that:
a. The square annular radiation patch 2 consists of a square ring 2-1, a triangular loading unit 2-2, a triangular loading unit 2-3, a triangular loading unit 2-4, a triangular loading unit 2-5, a triangular loading unit 2-6, a triangular loading unit 2-7, a triangular loading unit 2-8 and a triangular loading unit 2-9, wherein the square ring 2-1 is positioned at the outer edge of the square annular radiation patch 2, rectangular grooves with the same size are formed on four edges of the square ring 2-1 to form a zigzag structure, the surface current path of the radiation unit can be prolonged, the size of an antenna is reduced, and the triangular loading unit 2-2, the triangular loading unit 2-3, the triangular loading unit 2-4, the triangular loading unit 2-5, The triangular loading units 2-6, the triangular loading units 2-7, the triangular loading units 2-8 and the triangular loading units 2-9 are positioned at the center of the inner side of the square annular radiation patch 2, each triangular loading unit is connected with the square ring 2-1 through a high-impedance rectangular conduction band parallel to the diagonal direction of the dielectric substrate 1, the effective capacitance and inductance distribution of unit length can be effectively increased, the propagation constant is increased, the resonant frequency of the antenna is shifted to the low-frequency direction, gaps among the triangular loading units 2-4, the triangular loading units 2-5, the triangular loading units 2-8 and the triangular loading units 2-9 are extended to the edge of the square ring 2-1 to form an open circuit structure, and the triangular loading units 2-4, the triangular loading units 2-5, the triangular loading units 2-8, The triangular loading units 2-9 are connected close to the central position through rectangular conduction bands to generate geometric disturbance, so that orthogonal components with equal amplitude and 90-degree phase difference are formed in space, the circular polarization characteristic is generated, and the circular polarization purity can be further optimized by adjusting the size of a connecting rectangle;
b. The short-circuit probe 3 and the short-circuit probe 4 are arranged on the triangular loading unit 2-4 and the triangular loading unit 2-8 in the square annular radiation patch 2, the short-circuit probe 3 and the short-circuit probe 4 are symmetrical with respect to the center of the antenna dielectric substrate 1, new resonance points can be introduced by adding the short-circuit probe 3 and the short-circuit probe 4, and the axial ratio bandwidth of the implanted antenna is further widened;
c. The coaxial connector 5 is positioned on the triangular loading units 2-6 in the square annular radiation patch 2, the inner core of the coaxial connector 5 is connected with the square annular radiation patch 2, and the outer core of the coaxial connector 5 is connected with the floor 6;
d. The floor 6 is of a complete square structure, a shielding layer can be formed in the implanted wireless biomedical device, interference of the antenna on other electronic elements of the implanted wireless biomedical device is reduced, and the electromagnetic compatibility of the implanted antenna is improved.
The length L of the dielectric substrate 1 is 9.5 mm-10.5 mm, and the width W is 9.5 mm-10.5 mm.
2 4 6 3 5 1 3 2 1the distance W2 between a square ring 2-1 of the square ring-shaped radiation patch 2 and the edge of the dielectric substrate is 0.2 mm-0.4 mm, the width L4 of the square ring 2-1 is 0.9 mm-1.2 mm, the length L6 of a rectangular groove around the square ring 2-1 is 0.7 mm-0.9 mm, the width W3 is 0.1 mm-0.3 mm, the width L5 of the zigzag structure is 0.1 mm-0.3 mm, eight triangle loading units at the center position of the inner side of the square ring-shaped radiation patch 2 are isosceles right-angled triangles, the length W1 of the right-angled sides is 2.8 mm-3.1 mm, the gap width L3 between the eight triangle loading units is 0.1 mm-0.3 mm, the high-resistance rectangular guide bandwidth L2 connecting the eight triangle loading units with the square ring 2-1 is 0.2 mm-0.4 mm, the triangle loading units are connected with the triangle loading units 2-5 and the triangle loading units 2-8 mm, The rectangular guide belt length L1 of the triangular loading units 2-9 is 0.4 mm-0.6 mm.
1 1 2The distance R1 between the short circuit probe 3 and the short circuit probe 4 and the center of the medium substrate 1 is 2.6 mm-3.1 mm, the included angle a1 between the circle center positions of the short circuit probe 3 and the short circuit probe 4 and the longitudinal symmetry axis of the medium substrate 1 is 6-14 degrees, the radius R2 of the short circuit probe 3 and the short circuit probe 4 is 0.2 mm-0.4 mm, and the radius of the short circuit probe 3 and the short circuit probe 4 is equal to the radius of an inner core of the coaxial connector 5.
0 0The distance L0 between the coaxial connector 5 and the transverse symmetry axis of the dielectric substrate 1 is 0.8 mm-1.2 mm, and the distance W0 between the coaxial connector 5 and the longitudinal symmetry axis of the dielectric substrate 1 is 1.8 mm-2.2 mm.
rthe outer surface of the square-ring-shaped circularly polarized implanted antenna is plated with a layer of biocompatible material aluminum oxide, the thickness is 0.03mm, the dielectric constant epsilon r is 9.2, the loss tangent tan delta is 0.008, human tissues are isolated from the circularly polarized implanted antenna, and the influence of the human tissues on the performance of the antenna is reduced.
3The invention has the following effects: the invention designs a square annular circularly polarized implanted antenna for wireless biomedical treatment, rectangular grooves with the same size are formed on four sides of a square ring to form a winding structure, a current path on the surface of a radiation unit can be prolonged, and the size of the antenna is reduced. Eight triangular loading units are loaded in the middle of the square annular radiation patch, so that the effective capacitance and inductance distribution of unit length can be effectively increased, the propagation constant is increased, and the resonant frequency of the antenna is shifted to the low-frequency direction. The gaps of the two groups of triangular loading units extend to the edges of the square rings to form an open-circuit structure, the two groups of triangular loading units are connected by the rectangular conduction band near the center position to generate geometric disturbance, so that orthogonal components with equal amplitude and 90-degree phase difference are formed in space, the circular polarization characteristic is generated, and the polarization purity can be further optimized by adjusting the size of the connecting rectangle. The floor adopts complete square structure, can form the shielding layer in implanted wireless biomedical device, reduces the antenna to the interference of other electronic components of implanted wireless biomedical device, promotes the electromagnetic compatibility ability of implanted antenna. Two short-circuit probes are added, so that a new resonance point can be introduced, and the axial ratio bandwidth of the implanted antenna is further widened. The circularly polarized implanted antenna is of a planar structure, the volume of the antenna is only 10 multiplied by 0.635mm3, the circularly polarized implanted antenna has the characteristics of miniaturization, circular polarization, wide frequency band, interference resistance, good biocompatibility and the like, is suitable for WMTS 1.43GHz frequency band, and can meet the working requirement after being implanted into human tissues.
drawings
Fig. 1 is a schematic front view of an embodiment of the present invention.
Fig. 2 is a schematic side view of an embodiment of the present invention.
Fig. 3 is a schematic diagram of a back structure according to an embodiment of the invention.
6 3Fig. 4 shows the effect of the length L6 and the width W3 of the rectangular slot around the square ring on the impedance bandwidth and the axial ratio bandwidth of the antenna according to the embodiment of the present invention.
1fig. 5 shows the effect of the length W1 of the legs of the eight triangular loading units on the impedance bandwidth and the axial ratio bandwidth of the antenna according to the embodiment of the present invention.
1Fig. 6 shows the effect of the connecting rectangular conductor strip length L1 of two groups of triangular loading units on the impedance bandwidth and the axial ratio bandwidth of the antenna according to the embodiment of the present invention.
FIG. 7 is a schematic illustration of the depth of implantation into a skin layer in accordance with an embodiment of the present invention.
Fig. 8 is a graph showing the effect of different implant depths H on the antenna impedance bandwidth and axial ratio bandwidth according to an embodiment of the present invention.
Fig. 9 is a plot of simulated and measured impedance bandwidth for an embodiment of the present invention.
FIG. 10 is an E-plane radiation pattern for an embodiment of the present invention at a frequency of 1.43 GHz.
FIG. 11 is an H-plane radiation pattern at a frequency of 1.43GHz according to an embodiment of the invention.
Detailed Description
The specific implementation mode of the invention is as follows: as shown in fig. 1, the square-ring circularly polarized implantable antenna for wireless biomedical use is composed of a dielectric substrate 1, a square-ring radiation patch 2, a short-circuit probe 3, a short-circuit probe 4, a coaxial connector 5, and a floor 6, and is characterized in that: the square annular radiation patch 2 consists of a square ring 2-1, a triangular loading unit 2-2, a triangular loading unit 2-3, a triangular loading unit 2-4, a triangular loading unit 2-5, a triangular loading unit 2-6, a triangular loading unit 2-7, a triangular loading unit 2-8 and a triangular loading unit 2-9, wherein the square ring 2-1 is positioned at the outer edge of the square annular radiation patch 2, rectangular grooves with the same size are formed on four edges of the square ring 2-1 to form a zigzag structure, the surface current path of the radiation unit can be prolonged, the size of an antenna is reduced, and the triangular loading unit 2-2, the triangular loading unit 2-3, the triangular loading unit 2-4, the triangular loading unit 2-5, The triangular loading units 2-6, the triangular loading units 2-7, the triangular loading units 2-8 and the triangular loading units 2-9 are positioned at the center of the inner side of the square annular radiation patch 2, each triangular loading unit is connected with the square ring 2-1 through a high-impedance rectangular conduction band parallel to the diagonal direction of the dielectric substrate 1, the effective capacitance and inductance distribution of unit length can be effectively increased, the propagation constant is increased, the resonant frequency of the antenna is shifted to the low-frequency direction, gaps among the triangular loading units 2-4, the triangular loading units 2-5, the triangular loading units 2-8 and the triangular loading units 2-9 are extended to the edge of the square ring 2-1 to form an open circuit structure, and the triangular loading units 2-4, the triangular loading units 2-5, the triangular loading units 2-8, The triangular loading units 2-9 are connected close to the central position through rectangular conduction bands to generate geometric disturbance, so that orthogonal components with equal amplitude and 90-degree phase difference are formed in space, the circular polarization characteristic is generated, and the circular polarization purity can be further optimized by adjusting the size of a connecting rectangle; the short-circuit probe 3 and the short-circuit probe 4 are arranged on the triangular loading unit 2-4 and the triangular loading unit 2-8 in the square annular radiation patch 2, the short-circuit probe 3 and the short-circuit probe 4 are symmetrical with respect to the center of the antenna dielectric substrate 1, new resonance points can be introduced by adding the short-circuit probe 3 and the short-circuit probe 4, and the axial ratio bandwidth of the implanted antenna is further widened; the coaxial connector 5 is positioned on the triangular loading units 2-6 in the square annular radiation patch 2, the inner core of the coaxial connector 5 is connected with the square annular radiation patch 2, and the outer core of the coaxial connector 5 is connected with the floor 6; the floor 6 is of a complete square structure, a shielding layer can be formed in the implanted wireless biomedical device, interference of the antenna on other electronic elements of the implanted wireless biomedical device is reduced, and the electromagnetic compatibility of the implanted antenna is improved.
The length L of the dielectric substrate 1 is 9.5 mm-10.5 mm, and the width W is 9.5 mm-10.5 mm.
2 4 6 3 5 1 3 2 1The distance W2 between a square ring 2-1 of the square ring-shaped radiation patch 2 and the edge of the dielectric substrate is 0.2 mm-0.4 mm, the width L4 of the square ring 2-1 is 0.9 mm-1.2 mm, the length L6 of a rectangular groove around the square ring 2-1 is 0.7 mm-0.9 mm, the width W3 is 0.1 mm-0.3 mm, the width L5 of the zigzag structure is 0.1 mm-0.3 mm, eight triangle loading units at the center position of the inner side of the square ring-shaped radiation patch 2 are isosceles right-angled triangles, the length W1 of the right-angled sides is 2.8 mm-3.1 mm, the gap width L3 between the eight triangle loading units is 0.1 mm-0.3 mm, the high-resistance rectangular guide bandwidth L2 connecting the eight triangle loading units with the square ring 2-1 is 0.2 mm-0.4 mm, the triangle loading units are connected with the triangle loading units 2-5 and the triangle loading units 2-8 mm, The rectangular guide belt length L1 of the triangular loading units 2-9 is 0.4 mm-0.6 mm.
1 1 2the distance R1 between the short circuit probe 3 and the short circuit probe 4 and the center of the medium substrate 1 is 2.6 mm-3.1 mm, the included angle a1 between the circle center positions of the short circuit probe 3 and the short circuit probe 4 and the longitudinal symmetry axis of the medium substrate 1 is 6-14 degrees, the radius R2 of the short circuit probe 3 and the short circuit probe 4 is 0.2 mm-0.4 mm, and the radius of the short circuit probe 3 and the short circuit probe 4 is equal to the radius of an inner core of the coaxial connector 5.
0 0The distance L0 between the coaxial connector 5 and the transverse symmetry axis of the dielectric substrate 1 is 0.8 mm-1.2 mm, and the distance W0 between the coaxial connector 5 and the longitudinal symmetry axis of the dielectric substrate 1 is 1.8 mm-2.2 mm.
rThe outer surface of the square-ring-shaped circularly polarized implanted antenna is plated with a layer of biocompatible material aluminum oxide, the thickness is 0.03mm, the dielectric constant epsilon r is 9.2, the loss tangent tan delta is 0.008, human tissues are isolated from the circularly polarized implanted antenna, and the influence of the human tissues on the performance of the antenna is reduced.
r 2 4 6 3 5 1 3 2 1 1 1 2 0 0 rExample (b): the specific manufacturing process is as described in the embodiment. A Rogers RO3210 dielectric substrate is selected, the dielectric constant ε r is 10.2, the loss tangent tan δ is 0.003, the thickness H is 0.635mm, and a standard SMA connector is adopted as the coaxial connector. The dielectric substrate 1 had a length L of 10mm and a width W of 10 mm. Rectangular grooves with the same size are formed on four edges of the square ring to form a winding structure, so that the surface current path of the radiating unit can be prolonged, and the size of the antenna is reduced. The distance W2 between a square ring 2-1 of the square annular radiation patch 2 and the edge of the dielectric substrate is 0.2mm, the width L4 around the square ring 2-1 is 1.05mm, the length L6 of a rectangular groove around the square ring 2-1 is 0.81mm, the width W3 is 0.24mm, the width L5 of the zigzag structure is 0.24mm, eight triangular loading units at the center position of the inner side of the square annular radiation patch 2 are isosceles right triangles, the length W1 of a right-angle side is 2.9mm, the width L3 of a gap between the eight triangular loading units is 0.2mm, the high-impedance rectangular conduction band width L2 connecting the eight triangular loading units with the square ring 2-1 is 0.35mm, and the length L1 of a rectangular conduction band connecting the triangular loading units 2-4, the triangular loading units 2-5, the triangular loading units 2-8 and the triangular loading units 2-9 is 0.5 mm. Eight triangular loading units are loaded in the middle of the square annular radiation patch, so that the effective capacitance and inductance distribution of unit length can be effectively increased, the propagation constant is increased, and the resonant frequency of the antenna is shifted to the low-frequency direction. The gaps of the two groups of triangular loading units extend to the edges of the square rings to form an open-circuit structure, the two groups of triangular loading units are connected through the rectangular conduction band near the center position to generate geometric disturbance, so that orthogonal components with equal amplitude and 90-degree phase difference are formed in space, the circular polarization characteristic is generated, and the circular polarization purity can be further optimized by adjusting the size of the connecting rectangle. The floor adopts complete square structure, can form the shielding layer in implanted wireless biomedical device, reduces the antenna to the interference of other electronic components of implanted wireless biomedical device, promotes the electromagnetic compatibility ability of implanted antenna. The distance R1 between the short circuit probe 3 and the short circuit probe 4 and the center of the medium substrate 1 is 2.8mm, the included angle a1 between the circle center positions of the short circuit probe 3 and the short circuit probe 4 and the longitudinal symmetry axis of the medium substrate 1 is 10 degrees, the radius R2 of the short circuit probe 3 and the short circuit probe 4 is 0.3mm, and the radius of the short circuit probe 3 and the short circuit probe 4 is equal to the radius of an inner core of the coaxial connector 5. Two short-circuit probes are added, so that a new resonance point can be introduced, and the axial ratio bandwidth of the implanted antenna is further widened. The distance L0 from the transverse symmetry axis of the dielectric substrate 1 of the coaxial connector 5 is 1mm, and the distance W0 from the longitudinal symmetry axis of the dielectric substrate 1 is 2 mm. The outer surface of the square-ring-shaped circularly polarized implanted antenna is plated with a layer of biocompatible material aluminum oxide, the thickness is 0.03mm, the dielectric constant epsilon r is 9.2, the loss tangent tan delta is 0.008, human tissues and the circularly polarized implanted antenna are isolated, and the influence of the human tissues on the performance of the antenna is reduced.
6 3 6 3 6 3 6 3 6 3The rectangular slot length L6 and the width W3 around the square ring are selected to analyze the influence on the impedance bandwidth and the axial ratio bandwidth of the antenna, as shown in fig. 4, three cases of L6 being 0.7mm, W3 being 0.1mm, L6 being 0.81mm, W3 being 0.24mm, L6 being 0.9mm, and W3 being 0.3mm are respectively selected to analyze , as the size of the rectangular slot increases, the resonant point of the circularly polarized implanted antenna shifts to the low frequency, and the frequency point of the optimal axial ratio performance shifts to the low frequency, which shows that the miniaturization degree of the antenna is improved. When L6 is 0.81mm, W3 is 0.24mm, circular polarization implanted antenna can obtain better performance, impedance bandwidth and axial ratio bandwidth both cover the required WMTS 1.43GHz frequency band.
The lengths W1 of the right-angled sides of the eight triangular loading units are selected to analyze the influence on the impedance bandwidth and the axial ratio bandwidth of the antenna, as shown in fig. 5, three conditions of W1 being 2.8mm, W1 being 2.9mm and W1 being 3mm are respectively selected to analyze the performance of the antenna, as can be seen from fig. 5, along with the increase of the lengths of the right-angled sides of the triangular loading units, the resonant frequency of the circularly polarized implanted antenna shifts to the low frequency direction, the frequency point with the optimal axial ratio performance also shifts to the low frequency, the resonant degree first increases and then decreases, and the frequency point with the optimal axial ratio performance also shifts to the low frequency. When W1 is 2.9mm, circular polarization implanted antenna can obtain better performance, and impedance bandwidth and axial ratio bandwidth both cover the required WMTS 1.43GHz frequency band.
The method includes the steps that the lengths L1 of connecting rectangular guide belts of two groups of triangular loading units are selected to analyze influences on impedance bandwidths and axial ratio bandwidths of antennas, as shown in fig. 6, three conditions of 0.4mm L1 mm L1 mm L395 mm L1 mm L356 mm are respectively selected to analyze antenna performance, and as can be seen from fig. 6, the resonance degree of a circularly polarized implanted antenna is increased and then decreased, the resonance point is slightly shifted towards low frequency, the lowest value of axial ratio performance is decreased and then increased, which indicates that the length of the rectangular guide belt has large influences on antenna impedance matching and polarization purity.
The circularly polarized implanted antenna designed by the invention is mainly applied to a skin layer, and the implantation precision cannot be so accurate in the actual implantation process, so that the influence of the implantation depth on the antenna performance is analyzed, the distance between the upper layer of a skin model and the upper surface of the antenna is H, a schematic diagram of the depth of the implanted skin layer is shown in fig. 7, the influence of different implantation depths H on the impedance bandwidth and the axial ratio bandwidth of the antenna is shown in fig. 8, along with the increase of the implantation depth, the resonance point of the circularly polarized implanted antenna slightly shifts to a low frequency, the resonance degree gradually increases, the required WMTS 1.43GHz frequency band can still be well covered, and the lowest value of the axial ratio performance gradually increases, but the circularly polarized performance of the three implantation depths can still cover the required WMTS 1.43GHz frequency band.
An implanted circularly polarized antenna is placed in a simulated human tissue environment, the impedance bandwidth of the antenna is tested by using a vector network analyzer, the axial ratio bandwidth of the antenna is tested in an indirect mode of matching the external antenna, the simulation result and the test result of the impedance bandwidth, the axial ratio bandwidth are shown in figure 9, the simulated impedance bandwidth of the implanted antenna is 1.34 GHz-1.49 GHz, the resonance frequency is 1.43GHz, the simulated axial ratio bandwidth is 1.35 GHz-1.47 GHz, the actually measured impedance bandwidth is 1.33 GHz-1.45 GHz, the resonance frequency is 1.42GHz, the resonance degree is increased, the actually measured axial ratio bandwidth is 1.34 GHz-1.46 GHz, the axial ratio bandwidth can cover the working frequency, the actually measured and simulated results are good in consistency, the working bandwidth of the implanted antenna is wide, the impedance characteristic and the axial ratio characteristic in the working frequency band are good, the centers of the resonance frequency and the axial ratio bandwidth are slightly shifted to the low frequency, and the shift is mainly caused by the existence of bubbles between the implanted antenna and the simulated human tissue, The processing test error, the influence of the coaxial cable on the antenna test and the difference between the dielectric constants of the test environment and the simulation environment are caused.
The E-plane and H-plane radiation patterns of the antenna at the frequency point of 1.43GHz are tested, the radiation characteristics of the antenna are checked, and the actually measured pattern is shown in fig. 10 and 11. The directional diagram shows that the main polarization of the implanted circularly polarized antenna is right-hand circular polarization, the maximum right-hand gain value is-23 dBi, the two groups of triangular loading units are connected by a rectangular conduction band near the center position to generate geometric disturbance, so that the right-hand circular polarization characteristic is generated, the antenna has good radiation characteristic in a working frequency band, the axial ratio wave beam is wide, the antenna is suitable for WMTS 1.43GHz working frequency bands, and the requirement of a complex implantation environment can be met.
The safety of the circularly polarized implanted antenna is comprehensively analyzed, 1W input signals are provided for the circularly polarized implanted antenna, the safety range of the energy absorption of a human body model is evaluated by utilizing an average SAR value, the maximum 1-/10-gSAR value of the circularly polarized implanted antenna at 1.43GHz is 259.2/28.4W/kg through simulation calculation, the maximum allowable input power of the circularly polarized implanted antenna is 5.18mW and 41.5mW so as to meet the safety standard of FCC and IEEE on SAR values, and the circularly polarized implanted antenna is safe and harmless to human body tissues when meeting the electromagnetic radiation under the conditions.
Claims (6)
1. a square ring circular polarization implanted antenna for wireless bio-medical treatment comprises medium base plate (1), square ring radiation paster (2), short circuit probe (3), short circuit probe (4), coaxial joint (5), floor (6), its characterized in that:
a. The square annular radiation patch (2) consists of a square ring (2-1), a triangular loading unit (2-2), a triangular loading unit (2-3), a triangular loading unit (2-4), a triangular loading unit (2-5), a triangular loading unit (2-6), a triangular loading unit (2-7), a triangular loading unit (2-8) and a triangular loading unit (2-9), wherein the square ring (2-1) is positioned at the outer edge of the square annular radiation patch (2), rectangular grooves with the same size are formed in four edges of the square ring (2-1) to form a zigzag structure, the surface current path of the radiation unit can be prolonged, the size of the antenna is reduced, and the triangular loading unit (2-2), the triangular loading unit (2-3) are arranged, The antenna comprises triangular loading units (2-4), triangular loading units (2-5), triangular loading units (2-6), triangular loading units (2-7), triangular loading units (2-8) and triangular loading units (2-9) which are located at the center of the inner side of a square annular radiation patch (2), each triangular loading unit is connected with a square ring (2-1) through a high-impedance rectangular conduction band parallel to the diagonal direction of a dielectric substrate (1), effective capacitance and inductance distribution of unit length can be effectively increased, propagation constants are increased, the resonant frequency of the antenna is shifted to the low-frequency direction, and gaps among the triangular loading units (2-4), the triangular loading units (2-5), the triangular loading units (2-8) and the triangular loading units (2-9) extend to the edge of the square ring (2-1) to form an open-circuit structure The triangular loading units (2-4), the triangular loading units (2-5), the triangular loading units (2-8) and the triangular loading units (2-9) are connected close to the center positions through rectangular conduction bands to generate geometric disturbance, so that orthogonal components with equal amplitude and 90-degree phase difference are formed in space to generate a circular polarization characteristic, and the circular polarization purity can be further optimized by adjusting the size of a connecting rectangle;
b. The short-circuit probe (3) and the short-circuit probe (4) are arranged on a triangular loading unit (2-4) and a triangular loading unit (2-8) in the square annular radiation patch (2), the short-circuit probe (3) and the short-circuit probe (4) are centrosymmetric with respect to the antenna dielectric substrate (1), new resonance points can be introduced by adding the short-circuit probe (3) and the short-circuit probe (4), and the axial ratio bandwidth of the implanted antenna is further widened;
c. The coaxial connector (5) is positioned on the triangular loading unit (2-6) in the square annular radiation patch (2), an inner core of the coaxial connector (5) is connected with the square annular radiation patch (2), and an outer core of the coaxial connector (5) is connected with the floor (6);
d. The floor (6) is of a complete square structure, a shielding layer can be formed in the implanted wireless biomedical device, interference of the antenna on other electronic elements of the implanted wireless biomedical device is reduced, and the electromagnetic compatibility of the implanted antenna is improved.
2. The square-ring circular polarized implantable antenna for wireless biomedical applications according to claim 1, wherein the dielectric substrate (1) has a length L of 9.5mm to 10.5mm and a width W of 9.5mm to 10.5 mm.
3. The square-ring circularly polarized implantable antenna for wireless biomedical applications according to claim 1, wherein the square ring (2-1) of the square-ring shaped radiation patch (2) has a distance W2 of 0.2mm to 0.4mm from the edge of the dielectric substrate, a width L4 of 0.9mm to 1.2mm around the square ring (2-1), a rectangular slot length L6 of 0.7mm to 0.9mm around the square ring (2-1), a width W3 of 0.1mm to 0.3mm, a width L5 of the meander structure of 0.1mm to 0.3mm, eight triangular loading units at the central position of the inner side of the square-ring shaped radiation patch (2) are isosceles right triangles, a length W1 of 2.8mm to 3.1mm at right angles, a gap width L3 between the eight triangular loading units of 0.1mm to 0.3mm, a high impedance of L2 mm to 0.3mm connecting the eight triangular loading units with the square ring (2-1), the length L1 of the rectangular guide belt connecting the triangular loading unit (2-4), the triangular loading unit (2-5), the triangular loading unit (2-8) and the triangular loading unit (2-9) is 0.4 mm-0.6 mm.
4. The square-ring circularly polarized implantable antenna for wireless biomedical treatment according to claim 1, wherein the distance R1 between the short-circuit probe (3) and the short-circuit probe (4) and the center of the dielectric substrate (1) is 2.6mm to 3.1mm, the included angle a1 between the circle center positions of the short-circuit probe (3) and the short-circuit probe (4) and the longitudinal symmetry axis of the dielectric substrate (1) is 6 degrees to 14 degrees, the radius R2 of the short-circuit probe (3) and the short-circuit probe (4) is 0.2mm to 0.4mm, and the radius of the short-circuit probe (3) and the short-circuit probe (4) is equal to the inner core radius of the coaxial connector (5).
5. The square-ring type circularly polarized implantable antenna for wireless biomedical applications according to claim 1, wherein the distance L0 between the coaxial connector (5) and the transverse symmetry axis of the dielectric substrate (1) is 0.8 mm-1.2 mm, and the distance W0 between the coaxial connector and the longitudinal symmetry axis of the dielectric substrate (1) is 1.8 mm-2.2 mm.
6. The square-ring circular polarization implantable antenna for wireless biomedical treatment according to claim 1, wherein a layer of biocompatible material aluminum oxide is plated on the outer surface of the square-ring circular polarization implantable antenna, the thickness is 0.03mm, the dielectric constant epsilonr is 9.2, and the loss tangent tan delta is 0.008, so that human tissues and the circular polarization implantable antenna are isolated, and the influence of the human tissues on the performance of the antenna is reduced.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1665461A1 (en) * | 2003-09-08 | 2006-06-07 | Samsung Electronics Co., Ltd. | Electromagnetically coupled small broadband monopole antenna |
| CN102832451A (en) * | 2012-09-18 | 2012-12-19 | 陕西海创中盈信息技术有限公司 | Wide-band miniaturized gain-controllable directional antenna and manufacturing method thereof |
| CN105846072A (en) * | 2016-05-05 | 2016-08-10 | 华南理工大学 | Broad axial ratio beam circularly polarized antenna used for biomedical telemetry |
| CN107732442A (en) * | 2017-09-13 | 2018-02-23 | 华南理工大学 | A kind of implanted circular polarized antenna applied to Wireless Medical Telemetry |
| JP2018207346A (en) * | 2017-06-06 | 2018-12-27 | 株式会社Ｓｏｋｅｎ | Antenna device |
| CN109473766A (en) * | 2018-12-26 | 2019-03-15 | 吉林医药学院 | Wireless broadband circle polarized implanted antenna of the biologic medical equipment based on graphene |
| CN209298336U (en) * | 2019-03-12 | 2019-08-23 | 吉林医药学院 | The double frequency implanted antenna based on graphene for rehabilitation nursing device |
| CN210576441U (en) * | 2019-10-10 | 2020-05-19 | 吉林医药学院 | Square ring-shaped circularly polarized implanted antenna for wireless biomedical treatment |
-
2019
- 2019-10-10 CN CN201910960059.8A patent/CN110544824B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1665461A1 (en) * | 2003-09-08 | 2006-06-07 | Samsung Electronics Co., Ltd. | Electromagnetically coupled small broadband monopole antenna |
| CN102832451A (en) * | 2012-09-18 | 2012-12-19 | 陕西海创中盈信息技术有限公司 | Wide-band miniaturized gain-controllable directional antenna and manufacturing method thereof |
| CN105846072A (en) * | 2016-05-05 | 2016-08-10 | 华南理工大学 | Broad axial ratio beam circularly polarized antenna used for biomedical telemetry |
| JP2018207346A (en) * | 2017-06-06 | 2018-12-27 | 株式会社Ｓｏｋｅｎ | Antenna device |
| CN107732442A (en) * | 2017-09-13 | 2018-02-23 | 华南理工大学 | A kind of implanted circular polarized antenna applied to Wireless Medical Telemetry |
| CN109473766A (en) * | 2018-12-26 | 2019-03-15 | 吉林医药学院 | Wireless broadband circle polarized implanted antenna of the biologic medical equipment based on graphene |
| CN209298336U (en) * | 2019-03-12 | 2019-08-23 | 吉林医药学院 | The double frequency implanted antenna based on graphene for rehabilitation nursing device |
| CN210576441U (en) * | 2019-10-10 | 2020-05-19 | 吉林医药学院 | Square ring-shaped circularly polarized implanted antenna for wireless biomedical treatment |
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