CN110854522A - Implanted small circularly polarized antenna loaded with octagonal complementary split resonant ring - Google Patents

Implanted small circularly polarized antenna loaded with octagonal complementary split resonant ring Download PDF

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Publication number
CN110854522A
CN110854522A CN201911184102.2A CN201911184102A CN110854522A CN 110854522 A CN110854522 A CN 110854522A CN 201911184102 A CN201911184102 A CN 201911184102A CN 110854522 A CN110854522 A CN 110854522A
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China
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octagonal
antenna
symmetrical
shaped structure
ring
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欧仁侠
鲍捷
杨春哲
张光雷
赵晓磊
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Jilin Medical College
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Jilin Medical College
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure

Abstract

According to the invention, the implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is designed, and the symmetrical C-shaped structures are added around the radiating patch loaded with the octagonal complementary split resonant ring, so that the current path on the surface of the antenna can be effectively prolonged, and the resonant frequency of the antenna can be reduced. The impedance matching can be optimized by adjusting the sizes of the T-shaped groove and the L-shaped groove, the capacitance distribution of unit length can be increased by adding two half-hexagonal patches at the opening end of the L-shaped groove, and the size of the antenna is reduced. The electrical length of the octagonal complementary split-ring structure is far shorter than the signal wavelength at resonance, so that the resonance frequency of the antenna shifts to a low frequency, and the size of the antenna is further reduced. The volume of the antenna is only 8.5 multiplied by 0.635mm3Having a frequency ofThe antenna has the characteristics of high bandwidth, miniaturization, circular polarization, interference resistance, biocompatibility and the like, is suitable for an ISM2.45GHz frequency band, and meets the working requirements of miniaturization and circular polarization after being implanted into a human tissue environment.

Description

Implanted small circularly polarized antenna loaded with octagonal complementary split resonant ring
Technical Field
The invention relates to the technical field of implanted antennas, in particular to an implanted small circularly polarized antenna loaded with an octagonal complementary split resonant ring, which is suitable for an implanted circularly polarized wireless biomedical device in an ISM2.45GHz frequency band.
Background
Wireless biomedical technologies capable of providing high quality medical services within a limited medical budget have become one of the focus of global attention. The implantable medical equipment is a core device of wireless biological medical treatment, does not need doctor intervention on the premise of not considering the physiological state of a patient, can continuously monitor the metabolism level of a human body, and provides all-dimensional diagnosis and treatment information for doctors. For example: the implantable medical device can be used for monitoring blood sugar of a diabetic patient, the traditional method mainly obtains data by finger blood sampling, the mode has the defects that pain is brought to the patient, the detection result cannot objectively reflect the general trend and the change direction related to the eating habit, the implantable blood sugar monitoring device can detect the blood sugar concentration in real time, and meanwhile, the detection data are transmitted to an external receiving device, so that a basis is provided for diagnosis of a doctor. Implantable medical devices are generally composed of a sensor, an antenna, a battery, a processor, and the like, wherein the implantable antenna is a key device for ensuring reliable communication of the implantable medical device, and the performance, size, power consumption, anti-interference capability, and biocompatibility of the implantable antenna all affect the working performance of the implantable medical device, so designing the implantable antenna is a complex and challenging task. The method for reducing the design size of the implanted antenna mainly comprises the following steps: a high-dielectric-constant dielectric substrate is selected, but the high-dielectric-constant material can cause the reduction of antenna gain and reduce impedance bandwidth, and the bandwidth, the gain and the size are comprehensively considered when the high-dielectric-constant material is selected; the short circuit loading technology is characterized in that a short circuit probe or a short circuit sheet is added between a radiation patch and a floor, and the size of an antenna is reduced on the premise of ensuring the radiation characteristic of the antenna to be unchanged; in the meander technology, grooves with different forms and sizes are formed on the surface of the radiation patch, so that surface current flows along the direction of the grooves, thereby prolonging the surface current path of the antenna, reducing the resonant frequency and realizing the miniaturization of the antenna; the fractal technology can realize the filling property of the surface of the radiation unit by the fractal structure, and the current path can be prolonged by increasing the iteration order, so that the resonant frequency of the antenna is reduced. The method for realizing the anti-interference capability mainly comprises a multi-input multi-output technology, a polarization diversity technology and a circular polarization technology, wherein the circular polarization technology has the characteristics of reducing the error rate, reducing polarization mismatch, inhibiting multipath interference and the like. In order to collect physiological parameters of a human body, stable and reliable information transmission between an implanted system and external receiving equipment is needed, the circularly polarized antenna can overcome the limitation of the placement angle of the antenna, the reliable information transmission between the implanted equipment and the external equipment is ensured, and meanwhile, the loss caused by the multipath effect can be reduced. Circularly polarized antennas usually take the form of a single feed, and double or multiple feeds increase the volume of the antenna. The circular polarization characteristic can be generated by introducing geometric perturbation, such as adding a cross slot in the middle of an antenna, cutting off a part of the shape of a diagonal of a patch, adding a strip-shaped slot on the diagonal of the patch and the like; circular polarization performance can be realized through aperture coupling or adding gaps on the annular structure; the use of a slow wave structure to increase the propagation constant per unit length also produces circular polarization characteristics. The complementary split resonant ring is a geometric mutual coupling structure, a gap part and a metal part are exchanged to obtain the complementary split resonant structure, the complementary split resonant structure is a metamaterial structure with negative magnetic conductivity, the dielectric constant of the metamaterial structure is far smaller than the wavelength of resonance, the position and the size of the split resonant ring are adjusted to realize the circular polarization performance of the antenna, and the complementary split resonant ring can meet the requirements of miniaturization and circular polarization design of the antenna.
Disclosure of Invention
The invention aims to provide an implanted small circularly polarized antenna loaded with an octagonal complementary split resonant ring, which has the characteristics of wide frequency band, miniaturization, circular polarization, interference resistance, excellent biocompatibility and the like, is easy to integrate into an implanted wireless biomedical device, is suitable for an ISM (industrial scientific medical) 2.45GHz frequency band, and can meet the working requirement after being implanted into human tissues.
The technical scheme of the invention is as follows: the implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is composed of a dielectric substrate 1, a loaded octagonal complementary split resonant 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:
a. the radiation patch 2 is provided with a groove around the radiation patch to form a symmetrical C-shaped structure 2-1, a symmetrical C-shaped structure 2-2, a symmetrical C-shaped structure 2-3 and a symmetrical C-shaped structure 2-4, the symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 are formed by forming a T-shaped groove and an L-shaped groove around the radiation patch, two right angles of the L-shaped groove are in transition connection through an isosceles right triangle, two half-hexagon patches are added at the opening end of the L-shaped groove, the symmetrical C-shaped structure 2-1 rotates 90 degrees respectively by taking the medium substrate 1 as the center to obtain a symmetrical C-shaped structure 2-2, a symmetrical C-shaped structure 2-3 and a symmetrical C-shaped structure 2-4, the symmetrical C-shaped structure 2-1 and the symmetrical C-shaped structure 2-4 are, The symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 can effectively prolong the antenna surface current path, reduce the antenna resonant frequency, adjust the sizes of the T-shaped groove and the L-shaped groove to optimize impedance matching, increase the capacitance distribution per unit length by adding two half hexagonal patches at the opening end of the L-shaped groove, further increase the propagation constant and reduce the size of the antenna, the octagonal complementary open resonant ring structure 2-5 is arranged at the center of the radiating patch, the octagonal complementary open resonant ring structure 2-5 is formed by opening two octagonal grooves at the center of the radiating patch to form an octagonal ring and an octagonal patch, the octagonal ring and the octagonal patch are respectively connected with the radiating patch through rectangular conduction bands, the octagonal complementary open resonant ring structure 2-5 is a metamaterial structural unit with negative dielectric constant, the electrical length of the antenna is far smaller than the signal wavelength in resonance, so that the resonance frequency of the antenna shifts to low frequency, the size of the antenna is further reduced, two orthogonal modes can be excited by adjusting the opening positions and sizes of the octagonal complementary opening resonance ring structures 2-5, the phase difference of the two modes is 90 degrees, the amplitude is equal, and the circular polarization characteristic is generated;
b. the short-circuit probes 3 and the short-circuit probes 4 are arranged on the left lower side and the left upper side of an octagonal complementary open resonant ring structure 2-5 loaded in the octagonal complementary open resonant ring radiation patch 2, the short-circuit probes 3 and the short-circuit probes 4 are symmetrical about the transverse axis of the antenna dielectric substrate 1, and the short-circuit probes 3 and the short-circuit probes 4 are increased to reduce the size of the antenna on the premise of ensuring that the radiation characteristic of the antenna is not changed;
c. the coaxial connector 5 is positioned at the right upper side of an octagonal complementary open resonant ring structure 2-5 in the octagonal complementary open resonant ring radiation patch 2, an inner core of the coaxial connector 5 is connected with the octagonal complementary open resonant ring radiation patch 2, and an outer core of the coaxial connector 5 is connected with the floor 6;
d. the floor 6 is a square complete metal patch structure, no gap or slot is added, a shielding layer can be formed between the implanted antenna and the lower-layer electronic device, interference of the implanted antenna on other electronic devices is effectively reduced, and the electromagnetic compatibility of the implanted antenna is improved.
The length L of the medium substrate 1 is 8 mm-9 mm, and the width W is 8 mm-9 mm.
The length L of the transverse rectangular groove of the T-shaped groove of the symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 in the loaded octagonal complementary opening resonant ring radiation patch 250.1 mm-0.3 mm, width W84.6 mm-4.8 mm, length L of the longitudinal rectangular groove10.9 mm-1.1 mm, width W70.1 mm-0.3 mm, and the length L of the upper rectangular branch of the C-shaped structure20.2 mm-0.4 mm, width W42.2 mm-2.4 mm, and the width W of the middle rectangular branch of the C-shaped structure60.2 mm-0.4 mm, and the transverse rectangular groove length L of the L-shaped groove30.4 mm-0.6 mm, two right angles of the L-shaped groove are transitionally connected by an isosceles right triangle, and the right angle side length W of the right triangle20.3 mm-0.5 mm, the distance W between the two right triangles31.6 mm-1.8 mm, two half-hexagonal patches are added at the opening end of the L-shaped groove, and the radius R of the half-hexagonal patches10.2 mm-0.4 mm, an octagonal complementary open resonator ring structure 2-5 is arranged at the center of the radiation patch, and the radius R of the octagonal patch50.7 mm-0.9 mm, the outer ring radius R of the octagonal ring31.7 mm-1.9 mm, inner ring radius R41.3 mm-1.5 mm, and the outer ring radius R of the outer side octagonal groove 22 mm-2.2 mm, and the right rectangular guide belt width L for connecting the octagonal ring70.2 mm-0.4 mm, rightThe included angle a between the central axis of the side rectangular conduction band and the transverse axis of the dielectric substrate 12Is 8-12 degrees and is connected with the left rectangular conducting strip width L of the octagonal patch60.5 mm-0.7 mm, and the included angle a between the central axis of the rectangular conduction band on the left side and the transverse axis of the dielectric substrate 11Is 6-10 degrees.
The distance L between the centers of the short- circuit probes 3 and 4 and the center of the dielectric substrate 182.2 mm-2.4 mm, and the included angles a between the short- circuit probes 3 and 4 and the longitudinal symmetry axis of the dielectric substrate 13The radius R of the short-circuit probe 3 and the short-circuit probe 4 is 25-35 DEG6The radius of the short circuit probe 3 and the radius of the short circuit probe 4 are equal to the radius of the inner core of the coaxial connector 5, and the radius of the inner core is 0.2 mm-0.4 mm.
The distance L between the center of the coaxial connector 5 and the transverse symmetrical axis of the dielectric substrate 101.8 mm-2.2 mm, and a distance W from the longitudinal symmetry axis of the dielectric substrate 10Is 1.8 mm-2.2 mm.
The size of the floor 6 is consistent with that of the medium substrate 1, the length L is 8 mm-9 mm, and the width W is 8 mm-9 mm.
The outer surface of the implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is plated with a layer of biocompatible film plating raw material alumina with insulating property, the biocompatible film plating raw material alumina is similar to the dielectric constant of the dielectric substrate 1, and the dielectric constant epsilonr9.2, the loss tangent tan delta is 0.008, the coating thickness is 0.03mm, the human tissue and the implanted small circularly polarized antenna are isolated, the human tissue is prevented from being in direct contact with the implanted small circularly polarized antenna to generate short circuit, and the influence of the human tissue on the performance of the implanted small circularly polarized antenna is reduced.
The invention has the following effects: according to the invention, the implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is designed, and the symmetrical C-shaped structures are added around the radiating patch loaded with the octagonal complementary split resonant ring, so that the current path on the surface of the antenna can be effectively prolonged, and the resonant frequency of the antenna can be reduced. The impedance matching can be optimized by adjusting the sizes of the T-shaped groove and the L-shaped groove, the capacitance distribution of unit length can be increased by adding two half-hexagonal patches at the opening end of the L-shaped groove, the propagation constant is further increased, and the size of the antenna is reduced. The structure of the octagonal complementary split resonant ring isA metamaterial structure unit with negative dielectric constant has an electrical length far smaller than a signal wavelength at resonance, so that the resonance frequency of an antenna is shifted to a low frequency, the size of the antenna is further reduced, two orthogonal modes can be excited by adjusting the opening position and size of an octagonal complementary open-ended resonant ring structure, the phase difference of the two modes is 90 degrees, and the two modes have equal amplitude, so that the circular polarization characteristic is generated. The floor is a square complete metal patch structure, no gap or slot is added, a shielding layer can be formed between the implanted antenna and the lower-layer electronic device, interference of the implanted antenna on other electronic devices is effectively reduced, and the electromagnetic compatibility of the implanted antenna is improved. The size of the antenna can be reduced by adding the short-circuit probe on the premise of ensuring that the radiation characteristic of the antenna is not changed. The implanted circularly polarized antenna is of a planar structure, and the volume of the antenna is only 8.5 multiplied by 0.635mm3The antenna has the characteristics of wide frequency band, miniaturization, circular polarization, interference resistance, excellent biocompatibility and the like, is suitable for the ISM2.45GHz frequency band, and meets the working requirements of miniaturization and circular polarization after being implanted into a human tissue environment.
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.
FIG. 4 shows the width W of the transverse rectangular slot of the T-shaped slot in the symmetrical C-shaped structure according to the embodiment of the present invention8Length L of longitudinal rectangular groove2The effect on the antenna impedance bandwidth and the axial ratio bandwidth.
FIG. 5 shows the outer ring radius R of an octagonal ring in accordance with an embodiment of the invention3Inner ring radius R4Radius R of octagonal patch5The effect on the antenna impedance bandwidth and the axial ratio bandwidth.
FIG. 6 is a schematic diagram illustrating an angle a between a central axis of a left rectangular conduction band and a transverse axis of a dielectric substrate according to an embodiment of the present invention1An included angle a between the central axis of the right rectangular conduction band and the transverse axis of the dielectric substrate2The effect on the antenna impedance bandwidth and the axial ratio bandwidth.
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 2.45 GHz.
FIG. 11 is an H-plane radiation pattern at a frequency of 2.45GHz 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 implanted small circularly polarized antenna loaded with the octagonal complementary split ring resonator is composed of a dielectric substrate 1, a radiation patch 2 loaded with the octagonal complementary split ring resonator, a short-circuit probe 3, a short-circuit probe 4, a coaxial connector 5 and a floor 6, and is characterized in that: the radiation patch 2 is provided with a groove around the radiation patch to form a symmetrical C-shaped structure 2-1, a symmetrical C-shaped structure 2-2, a symmetrical C-shaped structure 2-3 and a symmetrical C-shaped structure 2-4, the symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 are formed by forming a T-shaped groove and an L-shaped groove around the radiation patch, two right angles of the L-shaped groove are in transition connection through an isosceles right triangle, two half-hexagon patches are added at the opening end of the L-shaped groove, the symmetrical C-shaped structure 2-1 rotates 90 degrees respectively by taking the medium substrate 1 as the center to obtain a symmetrical C-shaped structure 2-2, a symmetrical C-shaped structure 2-3 and a symmetrical C-shaped structure 2-4, the symmetrical C-shaped structure 2-1 and the symmetrical C-shaped structure 2-4 are, The symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 can effectively prolong the antenna surface current path, reduce the antenna resonant frequency, adjust the sizes of the T-shaped groove and the L-shaped groove to optimize impedance matching, increase the capacitance distribution per unit length by adding two half hexagonal patches at the opening end of the L-shaped groove, further increase the propagation constant and reduce the size of the antenna, the octagonal complementary open resonant ring structure 2-5 is arranged at the center of the radiating patch, the octagonal complementary open resonant ring structure 2-5 is formed by opening two octagonal grooves at the center of the radiating patch to form an octagonal ring and an octagonal patch, the octagonal ring and the octagonal patch are respectively connected with the radiating patch through rectangular conduction bands, the octagonal complementary open resonant ring structure 2-5 is a metamaterial structural unit with negative dielectric constant, the electrical length of the antenna is far smaller than the signal wavelength in resonance, so that the resonance frequency of the antenna shifts to low frequency, the size of the antenna is further reduced, two orthogonal modes can be excited by adjusting the opening positions and sizes of the octagonal complementary opening resonance ring structures 2-5, the phase difference of the two modes is 90 degrees, the amplitude is equal, and the circular polarization characteristic is generated; the short-circuit probes 3 and the short-circuit probes 4 are arranged on the left lower side and the left upper side of an octagonal complementary open resonant ring structure 2-5 loaded in the octagonal complementary open resonant ring radiation patch 2, the short-circuit probes 3 and the short-circuit probes 4 are symmetrical about the transverse axis of the antenna dielectric substrate 1, and the short-circuit probes 3 and the short-circuit probes 4 are increased to reduce the size of the antenna on the premise of ensuring that the radiation characteristic of the antenna is not changed; the coaxial connector 5 is positioned at the right upper side of an octagonal complementary open resonant ring structure 2-5 in the octagonal complementary open resonant ring radiation patch 2, an inner core of the coaxial connector 5 is connected with the octagonal complementary open resonant ring radiation patch 2, and an outer core of the coaxial connector 5 is connected with the floor 6; the floor 6 is a square complete metal patch structure, no gap or slot is added, a shielding layer can be formed between the implanted antenna and the lower-layer electronic device, interference of the implanted antenna on other electronic devices is effectively reduced, and the electromagnetic compatibility of the implanted antenna is improved.
The length L of the medium substrate 1 is 8 mm-9 mm, and the width W is 8 mm-9 mm.
The length L of the transverse rectangular groove of the T-shaped groove of the symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 in the loaded octagonal complementary opening resonant ring radiation patch 250.1 mm-0.3 mm, width W84.6 mm-4.8 mm, length L of the longitudinal rectangular groove10.9 mm-1.1 mm, width W70.1 mm-0.3 mm, and the length L of the upper rectangular branch of the C-shaped structure20.2 mm-0.4 mm, width W42.2 mm-2.4 mm, and the width W of the middle rectangular branch of the C-shaped structure60.2 mm-0.4 mm, and the transverse rectangular groove length L of the L-shaped groove30.4 mm-0.6 mm, two right angles of the L-shaped groove are transitionally connected by an isosceles right triangle, and the right angle side length W of the right triangle20.3 mm-0.5 mm, the distance W between the two right triangles31.6 mm-1.8 mm, two half-hexagonal patches are added at the opening end of the L-shaped groove, and the radius R of the half-hexagonal patches10.2 mm-0.4 mm, an octagonal complementary open resonator ring structure 2-5 is arranged at the center of the radiation patch, and the radius R of the octagonal patch50.7 mm-0.9 mm, the outer ring radius R of the octagonal ring31.7 mm-1.9 mm, inner ring radius R41.3 mm-1.5 mm, and the outer ring radius R of the outer side octagonal groove 22 mm-2.2 mm, and the right rectangular guide belt width L for connecting the octagonal ring70.2 mm-0.4 mm, and the included angle a between the central axis of the right rectangular conduction band and the transverse axis of the dielectric substrate 12Is 8-12 degrees and is connected with the left rectangular conducting strip width L of the octagonal patch60.5 mm-0.7 mm, and the included angle a between the central axis of the rectangular conduction band on the left side and the transverse axis of the dielectric substrate 11Is 6-10 degrees.
The distance L between the centers of the short- circuit probes 3 and 4 and the center of the dielectric substrate 182.3 mm-2.5 mm, and the included angles a between the short- circuit probes 3 and 4 and the longitudinal symmetry axis of the dielectric substrate 13The radius R of the short-circuit probe 3 and the short-circuit probe 4 is 25-35 DEG6The radius of the short circuit probe 3 and the radius of the short circuit probe 4 are equal to the radius of the inner core of the coaxial connector 5, and the radius of the inner core is 0.2 mm-0.4 mm.
The distance L between the center of the coaxial connector 5 and the transverse symmetrical axis of the dielectric substrate 101.8 mm-2.2 mm, and a distance W from the longitudinal symmetry axis of the dielectric substrate 10Is 1.8 mm-2.2 mm.
The size of the floor 6 is consistent with that of the medium substrate 1, the length L is 8 mm-9 mm, and the width W is 8 mm-9 mm.
The outer surface of the implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is plated with a layer of biocompatible film plating raw material alumina with insulating property, the biocompatible film plating raw material alumina is similar to the dielectric constant of the dielectric substrate 1, and the dielectric constant epsilonr9.2, loss tangent tan delta of 0.008, coating thickness of 0.03mm, isolation of human tissue and implantation type small circular polarized antennaThe wire prevents human tissue and the small-size circular polarized antenna direct contact of implanted and takes place the short circuit, reduces human tissue to the small-size circular polarized antenna performance's of implanted influence.
Example (b): the specific manufacturing process is as described in the embodiment. Selecting Rogers RO3210 dielectric substrate with dielectric constant ∈r10.2, loss tangent tan delta 0.003, thickness H0.635 mm, coaxial joint using standard SMA joint. The dielectric substrate 1 had a length L of 8.5mm and a width W of 8.5 mm. The symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 are added around the radiating patch, so that the surface current path of the antenna can be effectively prolonged, the resonant frequency of the antenna is reduced, the impedance matching can be optimized by adjusting the sizes of the T-shaped groove and the L-shaped groove, the capacitance distribution per unit length can be increased by adding two half-hexagonal patches at the opening end of the L-shaped groove, the propagation constant is further increased, and the size of the antenna is reduced. The symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 in the octagonal complementary opening resonant ring radiation patch 2 are loaded, and the length L of the transverse rectangular groove of the T-shaped groove is larger than that of the symmetrical C-shaped structure 2-45Is 0.2mm, width W84.7mm, length L of the longitudinal rectangular groove1Is 1mm and has a width W70.2mm, the length L of the upper rectangular branch of the C-shaped structure2Is 0.3mm, wide W42.3mm, the width W of the middle rectangular branch of the C-shaped structure6Is 0.3mm, and the transverse rectangular groove length L of the L-shaped groove3Is 0.5mm, two right angles of the L-shaped groove are in transition connection through an isosceles right triangle, and the right angle side length W of the right triangle2Is 0.4mm, and the distance W between the two right triangles31.7mm, two half-hexagonal patches are added at the opening end of the L-shaped groove, and the radius R of the half-hexagonal patches1Is 0.27 mm. An octagonal complementary split resonant ring structure 2-5 is arranged in the center of a radiating patch, the octagonal complementary split resonant ring structure 2-5 is a metamaterial structural unit with negative dielectric constant, the electrical length of the metamaterial structural unit is far smaller than the signal wavelength during resonance, so that the resonant frequency of the antenna is shifted to low frequency, the size of the antenna is further reduced, two orthogonal modes can be excited by adjusting the opening position and size of the octagonal complementary split resonant ring structure 2-5, the two modes have phase difference of 90 degrees and equal amplitudeThereby generating a circular polarization characteristic. Radius R of octagonal patch50.8mm, outer ring radius R of the octagonal ring31.8mm, inner ring radius R4Is 1.4mm, and the outer ring radius R of the outer side octagonal groove22.1mm, the width L of the right rectangular guide belt connecting the octagonal ring7Is 0.3mm, and the included angle a between the central axis of the right rectangular conduction band and the transverse axis of the dielectric substrate 12Is 10 degrees, and is connected with the left rectangular conducting strip width L of the octagonal patch6Is 0.6mm, and the included angle a between the central axis of the rectangular conduction band at the left side and the transverse axis of the dielectric substrate 11Is 8 degrees. The short- circuit probes 3 and 4 are added, so that the size of the antenna can be reduced on the premise of ensuring that the radiation characteristic of the antenna is not changed. The distance L between the centers of the short- circuit probes 3 and 4 and the center of the dielectric substrate 182.4mm, and the included angles a between the short- circuit probes 3 and 4 and the longitudinal symmetry axis of the dielectric substrate 1330 degrees, the radius R of the short-circuit probe 3 and the short-circuit probe 46The radius of the short-circuit probe 3 and the radius of the short-circuit probe 4 are equal to the radius of the inner core of the coaxial connector 5, and the radius is 0.3 mm. The distance L between the center of the coaxial connector 5 and the transverse symmetrical axis of the dielectric substrate 10Is 2mm, and is spaced from the longitudinal symmetry axis of the dielectric substrate 1 by a distance W0Is 2 mm. The floor 6 is a square complete metal patch structure, no gap or slot is added, a shielding layer can be formed between the implanted antenna and the lower-layer electronic device, the interference of the implanted antenna to other electronic devices is effectively reduced, and the electromagnetic compatibility of the implanted antenna is improved. The floor 6 is identical in size to the dielectric substrate 1, and has a length L of 8.5mm and a width W of 8.5 mm. The outer surface of the implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is plated with a layer of biocompatible coating raw material alumina with insulating property, the dielectric constant of the alumina is similar to that of the dielectric substrate 1, and the dielectric constant epsilonr9.2, the loss tangent tan delta is 0.008, the coating thickness is 0.03mm, the human tissue and the implanted small circularly polarized antenna are isolated, the human tissue is prevented from being in direct contact with the implanted small circularly polarized antenna to generate short circuit, and the influence of the human tissue on the performance of the implanted small circularly polarized antenna is reduced.
Selecting the width W of the transverse rectangular groove of the T-shaped groove in the symmetrical C-shaped structure8Length L of longitudinal rectangular groove2The analysis of the effect on the antenna impedance bandwidth and axial ratio bandwidth is shown in FIG. 4, where W is selected separately8＝4.6mm、L2＝0.2mm、W8＝4.7mm、L20.3mm and W8＝4.8mm、L2The performance of the antenna is analyzed under three conditions of 0.4mm, and as can be seen from fig. 4, as the size of the T-shaped groove in the symmetrical C-shaped structure increases, the resonant frequency of the antenna shifts to a certain extent in the low-frequency direction, and the frequency point with the best axial ratio performance also shifts to the low-frequency direction, because the increase of the symmetrical C-shaped structure can effectively prolong the surface current path of the antenna, reduce the resonant frequency of the antenna, and adjust the sizes of the T-shaped groove and the L-shaped groove to optimize impedance matching. When W is8＝4.7mm、L2When the antenna is 0.3mm, the antenna performance is best, and the impedance bandwidth and the axial ratio bandwidth both cover the needed ISM2.45GHz frequency band.
The outer ring radius R of the octagonal ring is selected3Inner ring radius R4Radius R of octagonal patch5Analysis of the effects on antenna impedance bandwidth and axial ratio bandwidth is shown in FIG. 5, where R is selected separately3＝1.7mm、R4＝1.3mm、R5＝0.7mm、R3＝1.8mm、R4＝1.4mm、R50.8mm and R3＝1.9mm、R4＝1.5mm、R5The antenna performance was analyzed for the three cases of 0.9mm, and it can be seen from fig. 5 that the outer ring radius R of the octagonal ring is varied3Inner ring radius R4Radius R of octagonal patch5The size is increased, the antenna resonance frequency point shifts towards the low-frequency direction, and the frequency point with the best axial ratio performance shifts towards the low-frequency position, because the octagonal complementary open-ended resonant ring structure is a metamaterial structural unit with negative dielectric constant, and the electrical length of the octagonal complementary open-ended resonant ring structure is far smaller than the signal wavelength during resonance, so that the antenna resonance frequency shifts towards the low frequency, and the size of the antenna is further reduced. When R is3＝1.8mm、R4＝1.4mm、R5When the antenna is 0.8mm, the antenna performance is best, and the impedance bandwidth and the axial ratio bandwidth both cover the needed ISM2.45GHz frequency band.
Selecting an included angle a between the central axis of the left rectangular conduction band and the transverse axis of the dielectric substrate1Right rectangular guide belt central axis andincluded angle a of transverse axis of dielectric substrate2The analysis of the influence on the impedance bandwidth and axial ratio bandwidth of the antenna is shown in FIG. 6, where a is selected1＝6°、a2＝8°、a1＝8°、a210 ° and a1＝10°、a2The performance of the antenna is analyzed in three cases of 12 degrees, and as can be seen from fig. 6, the included angle a between the central axis of the left rectangular conduction band and the transverse axis of the dielectric substrate is along with the included angle a between the central axis of the left rectangular conduction band and the transverse axis of the dielectric substrate1An included angle a between the central axis of the right rectangular conduction band and the transverse axis of the dielectric substrate2The reason is that two orthogonal modes can be excited by adjusting the opening position and the size of the octagonal complementary open-ended resonant ring structure, and the phase difference of the two modes is 90 degrees, and the amplitudes of the two modes are equal, so that the circular polarization characteristic is generated. When a is1＝8°、a2The antenna performance is best at 10 °, and both the impedance bandwidth and the axial ratio bandwidth cover the required ISM2.45GHz band.
The application environment of the implanted circularly polarized antenna designed by the invention is mainly a skin layer, the simulation environment is a single-layer skin model with the thickness of 160mm multiplied by 12mm, the antenna is arranged in the center of the single-layer skin model, the distance between the upper layer of the skin model and the upper surface of the antenna is H, the schematic diagram of the depth of the implanted skin layer is shown in figure 7, the influence of different implantation depths H on the impedance bandwidth and the axial ratio bandwidth of the antenna is shown in figure 8, the resonance point of the implanted circularly polarized antenna shifts to the low-frequency direction along with the increase of the implantation depth, the resonance degree is gradually reduced, the required ISM2.45GHz frequency band can be still well covered, the change of the axial ratio performance is large, and the three implantation depths can still keep radiating circularly.
The implanted circularly polarized antenna is placed in a solution simulating human skin for testing, wherein the skin solution comprises 58.2% of deionized water, 5.1% of diethylene glycol monobutyl ether and 36.7% of polyethylene glycol octyl phenyl ether. The impedance bandwidth of the antenna is tested by using a vector network analyzer, the circular polarization characteristic of the antenna is tested by an indirect mode of matching an in-vitro linear polarization dipole antenna, the simulation result and the test result of the impedance bandwidth and the axial ratio bandwidth are shown in figure 9, the simulation impedance bandwidth of the implanted circular polarization antenna is 2.35 GHz-2.62 GHz, the resonance frequency is 2.45GHz, the simulation axial ratio bandwidth is 2.38 GHz-2.47 GHz, the actually measured impedance bandwidth is 2.31 GHz-2.59 GHz, the resonance frequency is 2.43GHz, the resonance degree is increased to a certain extent, the actually measured axial ratio bandwidth is 2.36 GHz-2.51 GHz, the axial ratio bandwidth can cover the required working frequency, the difference between the simulation result and the test result is small, good resonance can be realized in an ISM frequency band, the working bandwidth of the implanted circular polarization 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, the frequency deviation caused by the increase of the resonance degree is mainly caused by the processing and testing errors of the implanted antenna, the influence of air bubbles between the coaxial cable and the simulated human body tissue on the antenna test and the difference of dielectric constants of the simulation test environment.
E-plane and H-plane radiation patterns of the implanted circularly polarized antenna at a frequency point of 2.45GHz are tested, the radiation characteristics of the antenna are checked, and the actually measured patterns are shown in figures 10 and 11. The directional diagram shows that the directivity of the antenna is good, the maximum radiation direction of the implanted circularly polarized antenna is along the Z-axis direction, the main polarization is right-hand circular polarization, the actual gain value along the Z-axis direction is-21.2 dBi, the difference between the main polarization and the cross polarization is 29.6dBi, two orthogonal modes can be excited mainly by adjusting the opening position and the size of the octagonal complementary opening resonant ring structure, the phase difference of the two modes is 90 degrees, the amplitude is equal, and therefore the circularly polarized 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 an ISM2.45GHz working frequency band, and the requirement of a complex implantation environment can be met.
Considering the safety factors of the implanted human body, the safety of the implanted circularly polarized antenna is comprehensively analyzed, 1W input signals are provided for the implanted circularly polarized antenna, the safety range of the energy absorbed by the human body model is evaluated by utilizing the average SAR value, the maximum 1-g maximum average SAR value of the human body tissue of the implanted circularly polarized antenna at 2.45GHz is 213.8W/kg, the maximum 10-g maximum average SAR value of the human body tissue is 41.2W/kg through simulation calculation, the maximum input energy of the implanted circularly polarized antenna is 8.1mW so as to meet the safety standard of FCC and IEEE on the SAR value, and the implanted circularly polarized antenna meets the condition that the electromagnetic radiation under the condition is safe and harmless to the human body tissue.

Claims (7)

1. The implanted small circularly polarized antenna loaded with the octagonal complementary split resonant ring is composed of a dielectric substrate 1, a loaded octagonal complementary split resonant 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:
a. the radiation patch 2 is provided with a groove around the radiation patch to form a symmetrical C-shaped structure 2-1, a symmetrical C-shaped structure 2-2, a symmetrical C-shaped structure 2-3 and a symmetrical C-shaped structure 2-4, the symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 are formed by forming a T-shaped groove and an L-shaped groove around the radiation patch, two right angles of the L-shaped groove are in transition connection through an isosceles right triangle, two half-hexagon patches are added at the opening end of the L-shaped groove, the symmetrical C-shaped structure 2-1 rotates 90 degrees respectively by taking the medium substrate 1 as the center to obtain a symmetrical C-shaped structure 2-2, a symmetrical C-shaped structure 2-3 and a symmetrical C-shaped structure 2-4, the symmetrical C-shaped structure 2-1 and the symmetrical C-shaped structure 2-4 are, The symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3 and the symmetrical C-shaped structure 2-4 can effectively prolong the antenna surface current path, reduce the antenna resonant frequency, adjust the sizes of the T-shaped groove and the L-shaped groove to optimize impedance matching, increase the capacitance distribution per unit length by adding two half hexagonal patches at the opening end of the L-shaped groove, further increase the propagation constant and reduce the size of the antenna, the octagonal complementary open resonant ring structure 2-5 is arranged at the center of the radiating patch, the octagonal complementary open resonant ring structure 2-5 is formed by opening two octagonal grooves at the center of the radiating patch to form an octagonal ring and an octagonal patch, the octagonal ring and the octagonal patch are respectively connected with the radiating patch through rectangular conduction bands, the octagonal complementary open resonant ring structure 2-5 is a metamaterial structural unit with negative dielectric constant, the electrical length of the antenna is far smaller than the signal wavelength in resonance, so that the resonance frequency of the antenna shifts to low frequency, the size of the antenna is further reduced, two orthogonal modes can be excited by adjusting the opening positions and sizes of the octagonal complementary opening resonance ring structures 2-5, the phase difference of the two modes is 90 degrees, the amplitude is equal, and the circular polarization characteristic is generated;
b. the short-circuit probes 3 and the short-circuit probes 4 are arranged on the left lower side and the left upper side of an octagonal complementary open resonant ring structure 2-5 loaded in the octagonal complementary open resonant ring radiation patch 2, the short-circuit probes 3 and the short-circuit probes 4 are symmetrical about the transverse axis of the antenna dielectric substrate 1, and the short-circuit probes 3 and the short-circuit probes 4 are increased to reduce the size of the antenna on the premise of ensuring that the radiation characteristic of the antenna is not changed;
c. the coaxial connector 5 is positioned at the right upper side of an octagonal complementary open resonant ring structure 2-5 in the octagonal complementary open resonant ring radiation patch 2, an inner core of the coaxial connector 5 is connected with the octagonal complementary open resonant ring radiation patch 2, and an outer core of the coaxial connector 5 is connected with the floor 6;
d. the floor 6 is a square complete metal patch structure, no gap or slot is added, a shielding layer can be formed between the implanted antenna and the lower-layer electronic device, interference of the implanted antenna on other electronic devices is effectively reduced, and the electromagnetic compatibility of the implanted antenna is improved.
2. The implanted small circularly polarized antenna loaded with the octagonal complementary split ring resonator of claim 1, wherein the length L of the dielectric substrate 1 is 8mm to 9mm, and the width W of the dielectric substrate is 8mm to 9 mm.
3. The implantable small circularly polarized antenna with the octagonal complementary split ring resonator of claim 1, wherein the symmetrical C-shaped structure 2-1, the symmetrical C-shaped structure 2-2, the symmetrical C-shaped structure 2-3, and the length L of the T-shaped slot of the transverse rectangular slot of the symmetrical C-shaped structure 2-4 in the radiating patch 2 with the octagonal complementary split ring resonator are all loaded50.1 mm-0.3 mm, width W84.6 mm-4.8 mm, length L of the longitudinal rectangular groove10.9 mm-1.1 mm, width W70.1 mm-0.3 mm, and the length L of the upper rectangular branch of the C-shaped structure20.2 mm-0.4 mm, width W42.2 mm-2.4 mm, and a C-shaped structureWidth of branch node W60.2 mm-0.4 mm, and the transverse rectangular groove length L of the L-shaped groove30.4 mm-0.6 mm, two right angles of the L-shaped groove are transitionally connected by an isosceles right triangle, and the right angle side length W of the right triangle20.3 mm-0.5 mm, the distance W between the two right triangles31.6 mm-1.8 mm, two half-hexagonal patches are added at the opening end of the L-shaped groove, and the radius R of the half-hexagonal patches10.2 mm-0.4 mm, an octagonal complementary open resonator ring structure 2-5 is arranged at the center of the radiation patch, and the radius R of the octagonal patch50.7 mm-0.9 mm, the outer ring radius R of the octagonal ring31.7 mm-1.9 mm, inner ring radius R41.3 mm-1.5 mm, and the outer ring radius R of the outer side octagonal groove22 mm-2.2 mm, and the right rectangular guide belt width L for connecting the octagonal ring70.2 mm-0.4 mm, and the included angle a between the central axis of the right rectangular conduction band and the transverse axis of the dielectric substrate 12Is 8-12 degrees and is connected with the left rectangular conducting strip width L of the octagonal patch60.5 mm-0.7 mm, and the included angle a between the central axis of the rectangular conduction band on the left side and the transverse axis of the dielectric substrate 11Is 6-10 degrees.
4. The implantable small circularly polarized antenna loaded with octagonal complementary split ring resonators according to claim 1, wherein the short-circuiting probes 3 and 4 have a center-to-center distance L from the center of the dielectric substrate 182.2 mm-2.4 mm, and the included angles a between the short-circuit probes 3 and 4 and the longitudinal symmetry axis of the dielectric substrate 13The radius R of the short-circuit probe 3 and the short-circuit probe 4 is 25-35 DEG6The radius of the short circuit probe 3 and the radius of the short circuit probe 4 are equal to the radius of the inner core of the coaxial connector 5, and the radius of the inner core is 0.2 mm-0.4 mm.
5. The implantable small circularly polarized antenna loaded with octagonal complementary split ring resonators as claimed in claim 1, wherein the distance L between the center of the coaxial connector 5 and the lateral symmetry axis of the dielectric substrate 1 is set01.8 mm-2.2 mm, and a distance W from the longitudinal symmetry axis of the dielectric substrate 10Is 1.8 mm-2.2 mm.
6. The implanted small circularly polarized antenna loaded with the octagonal complementary split ring resonator of claim 1, wherein the size of the floor 6 is consistent with that of the dielectric substrate 1, the length L is 8mm to 9mm, and the width W is 8mm to 9 mm.
7. The implantable small circularly polarized antenna loaded with the octagonal complementary split resonant ring according to claim 1, wherein a layer of alumina serving as a biocompatible coating material with insulating property is coated on the outer surface of the implantable small circularly polarized antenna loaded with the octagonal complementary split resonant ring, and the alumina has a dielectric constant close to that of the dielectric substrate 1, and has a dielectric constant epsilonr9.2, the loss tangent tan delta is 0.008, the coating thickness is 0.03mm, the human tissue and the implanted small circularly polarized antenna are isolated, the human tissue is prevented from being in direct contact with the implanted small circularly polarized antenna to generate short circuit, and the influence of the human tissue on the performance of the implanted small circularly polarized antenna is reduced.
CN201911184102.2A 2019-11-27 2019-11-27 Implanted small circularly polarized antenna loaded with octagonal complementary split resonant ring Pending CN110854522A (en)

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CN112103649A (en) * 2020-08-30 2020-12-18 西南电子技术研究所（中国电子科技集团公司第十研究所） L-band low-elevation-angle covering airborne front cabin satellite-borne phased array antenna
CN112886240A (en) * 2021-04-29 2021-06-01 电子科技大学中山学院 Novel metamaterial circular polarization MIMO antenna
CN112993585A (en) * 2021-02-26 2021-06-18 中国人民解放军空军工程大学 Broadband multifunctional multi-bit excitable super-structure surface system
CN113314837A (en) * 2021-05-31 2021-08-27 湖南汽车工程职业学院 Polarization insensitive WIFI frequency band electromagnetic energy collection surface
CN113964494A (en) * 2021-10-14 2022-01-21 西安邮电大学 Broadband circularly polarized antenna with filtering characteristic
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112103649A (en) * 2020-08-30 2020-12-18 西南电子技术研究所（中国电子科技集团公司第十研究所） L-band low-elevation-angle covering airborne front cabin satellite-borne phased array antenna
CN112993585A (en) * 2021-02-26 2021-06-18 中国人民解放军空军工程大学 Broadband multifunctional multi-bit excitable super-structure surface system
CN112993585B (en) * 2021-02-26 2022-11-11 中国人民解放军空军工程大学 Broadband multifunctional multi-bit excitable super-structure surface system
CN112886240A (en) * 2021-04-29 2021-06-01 电子科技大学中山学院 Novel metamaterial circular polarization MIMO antenna
CN112886240B (en) * 2021-04-29 2021-07-06 电子科技大学中山学院 Novel metamaterial circular polarization MIMO antenna
CN113314837A (en) * 2021-05-31 2021-08-27 湖南汽车工程职业学院 Polarization insensitive WIFI frequency band electromagnetic energy collection surface
CN113314837B (en) * 2021-05-31 2024-02-23 湖南汽车工程职业学院 Polarization-insensitive WIFI frequency band electromagnetic energy collection surface
CN113964494A (en) * 2021-10-14 2022-01-21 西安邮电大学 Broadband circularly polarized antenna with filtering characteristic
CN113964494B (en) * 2021-10-14 2023-10-03 西安邮电大学 Broadband circularly polarized antenna with filtering characteristic
CN114623850A (en) * 2022-03-15 2022-06-14 东南大学 Resonance enhanced passive coupling sensing structure
CN114623850B (en) * 2022-03-15 2024-01-26 东南大学 Resonance enhanced passive coupling sensing structure

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