CN117410708A - Miniaturized ultra-wideband circularly polarized implantable antenna - Google Patents
Miniaturized ultra-wideband circularly polarized implantable antenna Download PDFInfo
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- CN117410708A CN117410708A CN202311505254.4A CN202311505254A CN117410708A CN 117410708 A CN117410708 A CN 117410708A CN 202311505254 A CN202311505254 A CN 202311505254A CN 117410708 A CN117410708 A CN 117410708A
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- 230000005855 radiation Effects 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 20
- 238000003466 welding Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 9
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 230000010287 polarization Effects 0.000 abstract description 34
- 230000008878 coupling Effects 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 6
- 238000005859 coupling reaction Methods 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 description 13
- 238000000034 method Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005530 etching Methods 0.000 description 4
- 230000010355 oscillation Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000007917 intracranial administration Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012512 characterization method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 239000007943 implant Substances 0.000 description 2
- 238000001727 in vivo Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000000747 cardiac effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 238000000338 in vitro Methods 0.000 description 1
- 201000009941 intracranial hypertension Diseases 0.000 description 1
- 210000004761 scalp Anatomy 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6846—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be brought in contact with an internal body part, i.e. invasive
-
- 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
-
- 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
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
- H01Q5/25—Ultra-wideband [UWB] systems, e.g. multiple resonance systems; Pulse systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention provides a miniaturized ultra-wideband circularly polarized implantable antenna, comprising: the novel antenna comprises a medium substrate and a cover layer, wherein the cover layer is positioned at the top of the medium substrate, a radiation surface is printed at the top of the medium substrate, a ground plane is printed at the bottom of the medium substrate, a short circuit probe and a coaxial feed point center probe are communicated between the radiation surface and the ground plane, the center of the radiation surface is provided with a T-shaped rectangular groove, two sides of the T-shaped rectangular groove are provided with a first spiral rectangular groove and a second spiral rectangular groove, the first spiral rectangular groove and the second spiral rectangular groove are asymmetrically arranged, a U-shaped ground plane rectangular groove is arranged on the ground plane, and the U-shaped ground plane rectangular groove is communicated with the edge of the ground plane. The miniaturized ultra-wideband circularly polarized implantable antenna provided by the invention has the advantages of simple structure, small size, low section, low coupling, circular polarization, ultra-wideband and the like.
Description
Technical Field
The invention relates to the technical field of antennas, in particular to a miniaturized ultra-wideband circularly polarized implantable antenna.
Background
With the emerging advances in healthcare technology, a need has arisen to develop efficient and compact Wireless Implantable Medical Devices (WIMD) to monitor certain physiological parameters. These healthcare devices require an efficient implantable antenna for simultaneous data telemetry communication and Radio Frequency (RF) power reception.
The development of implantable antennas is challenging because of size limitations, biocompatibility, patient safety, and tissue coupling. Over the last several decades, the research community has made a great deal of effort to overcome these problems. Power delivery to WIMD is another important issue because the batteries (power supply) in these devices may discharge or expire, which requires a re-implantation procedure to replace the batteries, which may lead to risk and damage to human tissue. Thus, to avoid the above-mentioned risks and extend the lifetime of the device, wireless Power Transfer (WPT) is a suitable mechanism that eliminates the need for cables and batteries. In general, WPT technology includes two methods: near field inductive transmission and far field radiation transmission. In the former technique, two resonant coils (i.e., primary and secondary) are placed close to each other and are responsible for delivering power at low frequencies to an Implantable Medical Device (IMD). Significant research advances have been made in the design of near field WPT systems at 403MHz, 430MHz and 434MHz in [ Resonant inductive link for remote powering of pacemakers ], [ Efficient wireless power transfer systemintegrating with metasurface for biological applications ], and [ A dual-mode RF power harvesting system with an on-chip coil in 180-nm SOI CMOS for millimeter-sized biomedical implants ]. However, this technique provides a low Power Transmission Efficiency (PTE) of 47% or less due to sensitivity and misalignment issues of the two coils, small coupling coefficient, and low quality factor (Q). In contrast, in [ Far-field RF powering of implantabledevices: safety considerations ], the Far-field WPT has a higher transmission efficiency than the near-field WPT at 0.915/2.4/5.8 GHz. Also, the far field is less sensitive to misalignment between the transmitter (Tx) and the receiver (Rx) over long distances than the near field WPT.
Efficient sensing, monitoring and treatment of elevated intracranial pressure (ICP) is an important step in preserving patient life. Battery-powered MEMS pressure sensors were designed In [ In-vitro and In-vivo trans-scalp evaluation of an intracranial pressure implant at2.4GHz ] and [ Characterization of implantable antennas for intracranial pressure monitoring: reflection by and transmission through a scalp phantom ] to monitor changes In ICP and wirelessly transmit sensor data to an external controller at 2.45 GHz. In [ Characterization of 3-D loop antenna to overcome the impact of small lateral misalignment in wirelessly powered intracranial pressure monitoring system ], a batteryless pressure sensing system is reported, including implantable, on-body, and off-body units. The system is powered at 15MHz by near field inductive coupling. The disadvantage of this system is that it requires an additional far field antenna to operate at 2.45 gigahertz to transmit telemetry data. In [ An Ultra-Miniaturized Antenna With Ultra-Wide Bandwidth for Future Cardiac Leadless Pacemaker ], a far-field coupled Ultra-wideband implantable antenna is presented for addressing circuit detuning challenges caused by complex in-vivo environments.
However, the research on circular polarization is lacking in the above documents, the circular polarization antenna has obvious multipath resistance effect in medical environment, and the circular polarization implanted antenna with excellent performance has important value. Therefore, it is necessary to design a miniaturized ultra-wideband circularly polarized implantable antenna.
Disclosure of Invention
The invention aims to provide a miniaturized ultra-wideband circularly polarized implantable antenna which has the advantages of simple structure, small size, low section, low coupling, circular polarization, ultra-wideband and the like.
In order to achieve the above object, the present invention provides the following solutions:
a miniaturized ultra-wideband circularly polarized implantable antenna comprising: the device comprises a dielectric substrate and a covering layer, wherein the covering layer is positioned on the top of the dielectric substrate;
the top of the medium substrate is printed with a radiation surface, the bottom of the medium substrate is printed with a ground plane, and the radiation surface and the ground plane are communicated through a short circuit probe and a coaxial feed point center probe;
the center of the radiation surface is provided with the T-shaped rectangular groove, two sides of the T-shaped rectangular groove are provided with the first spiral rectangular groove and the second spiral rectangular groove, the first spiral rectangular groove and the second spiral rectangular groove are asymmetrically arranged, the U-shaped ground plane rectangular groove is arranged on the ground plane, and the U-shaped ground plane rectangular groove is communicated with the edge of the ground plane.
Optionally, the T-shaped rectangular groove is not communicated with the first spiral rectangular groove and the second spiral rectangular groove, the first spiral rectangular groove and the second spiral rectangular groove are respectively communicated with two side edges of the radiation surface, and the first spiral rectangular groove and the second spiral rectangular groove form a first spiral rectangle and a second spiral rectangle on the radiation surface.
Optionally, a radiating surface short circuit Kong Handian is disposed at the end of the first spiral rectangle, a radiating surface coaxial feed spot welding point is disposed at the end of the second spiral rectangle, and the radiating surface short circuit via hole welding point and the radiating surface coaxial feed spot welding point are respectively connected with the short circuit probe and the coaxial feed point center probe.
Optionally, the downside of U-shaped ground plane rectangular channel with the edge of ground plane is linked together, U-shaped ground plane rectangular channel forms L shape rectangle on the ground plane, the opposite side of ground plane corresponds the radiation face short circuit via hole solder joint is provided with the ground plane short circuit and crosses Kong Handian, L shape rectangular short end corresponds the coaxial feed point of radiation face is provided with the coaxial feed point ground port of ground plane, short circuit probe and coaxial feed point center probe connection ground plane short circuit cross Kong Handian and the coaxial feed point ground port of ground plane.
Optionally, the dielectric substrate and the cover layer are Rogers 5880 material, the relative dielectric constant is 2.2, the cover layer is Rogers 3010 material, the relative dielectric constant is 10.2, the radiation surface and the ground plane are both made of metallic copper material, and the coaxial feed center probe and the short circuit probe are both chlorinated polyethylene cylinders.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the miniaturized ultra-wideband circularly polarized implantable antenna provided by the invention introduces a short circuit probe, adopts a probe feeding mode, and realizes miniaturization by etching a spiral groove and a T-shaped groove on a radiation surface and forming a short pin between the radiation surface and the ground, particularly, etching two asymmetric U-shaped rectangular grooves on a ground plane, realizes wider impedance and axial ratio bandwidth, adopts a bent spiral structure to facilitate prolonging the effective path of current, and can control a main frequency point by adjusting the length and the position of the etched asymmetric U-shaped rectangular grooves on the ground plane, thereby having smaller size and volume of 17.0688mm 3 The method has the advantages of wide bandwidth (1.75 GHz-3.01 GHz), circular polarization, miniaturization and the like in a biological telemetry frequency band.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a radiation surface structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a ground plane structure according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of an embodiment of the present invention;
FIG. 4 is a graph of return loss of the antenna of the present embodiment in skin tissue at a frequency of 2.45 GHz;
FIG. 5 is a graph of the 3dB axial ratio of an antenna at 2.45GHz in an embodiment of the present invention;
FIG. 6 is a graph of the 3dB axial ratio of an antenna at 1.9GHz in an embodiment of the invention;
FIG. 7 is a graph showing the current amplitude distribution of the radiating surface of an antenna at a center frequency of 2.45GHz in accordance with an embodiment of the present invention;
FIG. 8 is a plot of ground plane current amplitude versus center frequency of 2.45GHz for an antenna in accordance with an embodiment of the present invention;
FIG. 9 is a radiation pattern of an antenna in skin tissue at a frequency of 2.45GHz, showing the main polarization as right-hand circular polarization in an embodiment of the invention;
fig. 10 is a radiation pattern of an antenna in skin tissue at a frequency of 1.9GHz in an embodiment of the invention, and the main polarization is seen as right-hand circular polarization.
Reference numerals: 1. a cover layer; 2. a radiation surface; 3. a dielectric substrate; 4. a ground plane; 5. the radiation surface is short-circuited by Kong Handian; 6. coaxial feed welding spots of the radiation surface; 7. a shorting probe; 8. a coaxial feed center probe; 9. a ground plane short circuit Kong Handian; 10. ground plane coaxial feed ground port; 11. a T-shaped rectangular groove; 12. a first helical rectangular groove; 13. a second helical rectangular groove; 14. u-shaped ground plane rectangular slot.
Detailed Description
The invention aims to provide a miniaturized ultra-wideband circularly polarized implantable antenna which has the advantages of simple structure, small size, low section, low coupling, circular polarization, ultra-wideband and the like.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, 2 and 3, the miniaturized ultra-wideband circularly polarized implantable antenna provided by the embodiment of the invention comprises: a dielectric substrate 3 and a cover layer 1, wherein the cover layer 1 is positioned on the top of the dielectric substrate 3;
the top of the medium substrate 3 is printed with a radiation surface 2, the bottom of the medium substrate 3 is printed with a ground plane 4, and the radiation surface 2 and the ground plane 4 are communicated through a short circuit probe 7 and a coaxial feed point center probe 8;
the center of the radiation surface 2 is provided with the T-shaped rectangular groove 11, two sides of the T-shaped rectangular groove 11 are provided with the first spiral rectangular groove 12 and the second spiral rectangular groove 13, the first spiral rectangular groove 12 and the second spiral rectangular groove 13 are asymmetrically arranged, the ground plane 4 is provided with the U-shaped ground plane rectangular groove 14, and the U-shaped ground plane rectangular groove 14 is communicated with the edge of the ground plane 4.
The T-shaped rectangular groove 11 is not communicated with the first spiral rectangular groove 12 and the second spiral rectangular groove 13, the first spiral rectangular groove 12 and the second spiral rectangular groove 13 are respectively communicated with two side edges of the radiation surface 2, the first spiral rectangular groove 12 and the second spiral rectangular groove 13 form a first spiral rectangle and a second spiral rectangle on the radiation surface 2, and the left side of the radiation surface 2 and the right side of the radiation surface 2 are asymmetrically arranged.
The end of the first spiral rectangle is provided with a radiating surface short circuit Kong Handian, the end of the second spiral rectangle is provided with a radiating surface coaxial feed-through spot welding point 6, and the radiating surface short circuit via hole welding point 5 and the radiating surface coaxial feed-through spot welding point 6 are respectively connected with the short circuit probe 7 and the coaxial feed-through point center probe 8.
The lower side of the U-shaped rectangular slot 14 is communicated with the edge of the ground plane 4, the U-shaped rectangular slot 14 forms an L-shaped rectangle on the ground plane, the other side of the ground plane 4 is provided with a ground plane short circuit board Kong Handian corresponding to the radiating surface short circuit via hole welding point 5, the short end of the L-shaped rectangle is provided with a ground plane coaxial feed point grounding port 10 corresponding to the radiating surface coaxial feed point welding point 6, and the short circuit probe 7 and the coaxial feed point central probe 8 are connected with the ground plane short circuit board Kong Handian and the ground plane coaxial feed point grounding port 10.
As shown in fig. 1 and 2, the dimensions of the first spiral rectangular groove 12, the second spiral rectangular groove 13, the U-shaped ground rectangular groove 14, the radiation surface 2, and the ground surface 4 will be described:
FIGS. 1 and 2 depict a majority of the length and width, as shown in Table 1;
table 1 size parameter table
In addition, taking the left side of the radiation surface 2 as an example, the first spiral rectangular groove 12 and the second spiral rectangular groove 13 are both of an internal spiral design, except that the width of the first spiral rectangular groove 12 is larger than that of the second spiral rectangular groove 13, the minimum width of the first spiral rectangular groove 12 is W1, the maximum width is L9, the minimum width of the second spiral rectangular groove 14 is W2, and the minimum width is W1;
the dimensions of the radiating surface short circuit via hole welding point 5, the radiating surface coaxial feed welding point 6, the ground plane short circuit Kong Handian and the ground plane coaxial feed grounding port 10 are shown in table 1, fig. 1 and fig. 2.
The dielectric substrate 3 and the cover layer 1 are made of Rogers 5880 material, the relative dielectric constant is 2.2, the cover layer 1 is made of Rogers 3010 material, the relative dielectric constant is 10.2, the radiation surface 2 and the ground plane 4 are made of metallic copper material, and the coaxial feed center probe 8 and the short circuit probe 7 are both chlorinated polyethylene cylinders.
FIG. 4 is a return loss curve of the antenna in skin tissue with the frequency of 2.45GHz, and it can be seen from FIG. 4 that the return loss of the antenna in the frequency range of 1.75-3.01GHz is less than-10 dB, the return loss in the frequency range of 1.9GHz and 2.45GHz is completely covered, the return loss in the frequency range of 1.9GHz is less than-10 dB, the far-field wireless energy transmission frequency range is realized, the return loss in the frequency range of 2.45GHz is less than-10 dB, and the biological telemetry frequency range is realized, meanwhile, the axial ratio of the antenna in the frequency ranges of 2.36-2.55GHz and 1.49-2.08 is less than 3dB, the bandwidth of circular polarization is wider, and the double circular polarization of the biological telemetry double frequency range is realized;
fig. 7 is an electric field distribution diagram of a radiation surface of the antenna of the present embodiment at a center frequency of 2.45GHz, and it can be seen from fig. 7 that at 2.45GHz, an electric field maximum occurs at an edge of one side with a matching stub, and the electric field distribution on the ground plane 4 below the excitation patch is larger than that on the other side of the excitation patch;
fig. 8 is a graph showing an electric field distribution of the ground plane at 2.45GHz of the antenna of the present embodiment, and it can be seen from fig. 8 that the electric field is stronger on the side close to the coaxial probe feed, and weaker on the lower left part of the ground plane;
fig. 9 is a radiation pattern of the antenna of the present embodiment in skin tissue at a frequency of 2.45GHz, in which the main polarization is seen as a right-hand circular polarization, in which gray lines are radiation patterns of the right-hand circular polarization (RHCP) of the antenna, the right-hand circular polarization is a polarization state of an electromagnetic wave in which an electric field propagates in a direction of rightward rotation, the right-hand circular polarization is characterized in that an oscillation direction of the electric field rotates in a clockwise direction, in which black lines are radiation patterns of the left-hand circular polarization (LHCP) of the antenna, the left-hand circular polarization is a polarization state of an electromagnetic wave in which an electric field propagates in a direction of leftward rotation, and the left-hand circular polarization is characterized in that an oscillation direction of the electric field rotates in a counterclockwise direction, and in which it can be seen that the maximum radiation gain of the antenna of the present embodiment is-26.6 dB;
fig. 10 is a radiation pattern of the antenna of the present embodiment in skin tissue at a frequency of 1.9GHz, in which the main polarization is seen as right-hand circular polarization, in which gray lines are radiation patterns of the right-hand circular polarization (RHCP) of the antenna, the right-hand circular polarization is a polarization state of electromagnetic waves, in which an electric field propagates in a direction of rightward rotation, the right-hand circular polarization is characterized by an oscillation direction of the electric field rotating in a clockwise direction, in which black lines are radiation patterns of the left-hand circular polarization (LHCP) of the antenna, the left-hand circular polarization is a polarization state of electromagnetic waves, in which an electric field propagates in a direction of leftward rotation, and the left-hand circular polarization is characterized by an oscillation direction of the electric field rotating in a counterclockwise direction, and in which the maximum radiation gain of the antenna of the present embodiment is seen as-29.06 dB.
The miniaturized ultra-wideband circularly polarized implantable antenna provided by the invention introduces a short circuit probe, adopts a probe feeding mode, and realizes miniaturization by etching a spiral groove and a T-shaped groove on a radiation surface and forming a short pin between the radiation surface and the ground, particularly, etching two asymmetric U-shaped rectangular grooves on a ground plane, realizes wider impedance and axial ratio bandwidth, adopts a bent spiral structure to facilitate prolonging the effective path of current, and can control a main frequency point by adjusting the length and the position of the etched asymmetric U-shaped rectangular grooves on the ground plane, thereby having smaller size and volume of 17.0688mm 3 The method has the advantages of wide bandwidth (1.75 GHz-3.01 GHz), circular polarization, miniaturization and the like in a biological telemetry frequency band.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (5)
1. A miniaturized ultra-wideband circularly polarized implantable antenna, comprising: the device comprises a dielectric substrate and a covering layer, wherein the covering layer is positioned on the top of the dielectric substrate;
the top of the medium substrate is printed with a radiation surface, the bottom of the medium substrate is printed with a ground plane, and the radiation surface and the ground plane are communicated through a short circuit probe and a coaxial feed point center probe;
the center of the radiation surface is provided with the T-shaped rectangular groove, two sides of the T-shaped rectangular groove are provided with the first spiral rectangular groove and the second spiral rectangular groove, the first spiral rectangular groove and the second spiral rectangular groove are asymmetrically arranged, the U-shaped ground plane rectangular groove is arranged on the ground plane, and the U-shaped ground plane rectangular groove is communicated with the edge of the ground plane.
2. The miniaturized ultra-wideband circularly polarized implantable antenna of claim 1, wherein the T-shaped rectangular slot is not in communication with the first and second helical rectangular slots, which are respectively in communication with the two side edges of the radiating surface, the first and second helical rectangular slots forming first and second helical rectangles on the radiating surface.
3. The miniaturized ultra-wideband circularly polarized implantable antenna of claim 2, wherein the end of the first spiral rectangle is provided with a radiating plane short circuit Kong Handian, the end of the second spiral rectangle is provided with a radiating plane coaxial feed spot welding point, and the radiating plane short circuit via welding point and the radiating plane coaxial feed spot welding point are respectively connected with the short circuit probe and the coaxial feed point center probe.
4. A miniaturized ultra-wideband circularly polarized implantable antenna according to claim 3, wherein the lower side of the U-shaped rectangular slot is communicated with the edge of the ground plane, the U-shaped rectangular slot forms an L-shaped rectangle on the ground plane, the other side of the ground plane is provided with a ground plane short circuit Kong Handian corresponding to the radiating plane short circuit via solder joint, the short end of the L-shaped rectangle is provided with a ground plane coaxial feed point ground port corresponding to the radiating plane coaxial feed point solder joint, and the short circuit probe and the coaxial feed point center probe are connected with the ground plane short circuit Kong Handian and the ground plane coaxial feed point ground port.
5. The miniaturized ultra-wideband circularly polarized implantable antenna of claim 1, wherein the dielectric substrate and cover layer are Rogers 5880 material with a relative dielectric constant of 2.2, the cover layer is Rogers 3010 material with a relative dielectric constant of 10.2, the radiating surface and the ground plane are both metallic copper material, and the coaxial feed center probe and the shorting probe are both chlorinated polyethylene cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311505254.4A CN117410708A (en) | 2023-11-13 | 2023-11-13 | Miniaturized ultra-wideband circularly polarized implantable antenna |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311505254.4A CN117410708A (en) | 2023-11-13 | 2023-11-13 | Miniaturized ultra-wideband circularly polarized implantable antenna |
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| Publication Number | Publication Date |
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| CN117410708A true CN117410708A (en) | 2024-01-16 |
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| CN202311505254.4A Pending CN117410708A (en) | 2023-11-13 | 2023-11-13 | Miniaturized ultra-wideband circularly polarized implantable antenna |
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| Country | Link |
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| CN (1) | CN117410708A (en) |
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- 2023-11-13 CN CN202311505254.4A patent/CN117410708A/en active Pending
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