CN-116505232-B - Miniaturized self-duplex implanted antenna

CN116505232BCN 116505232 BCN116505232 BCN 116505232BCN-116505232-B

Abstract

The invention provides a miniaturized self-duplex implanted antenna which comprises a dielectric substrate and a covering layer, wherein the covering layer is arranged on the top of the dielectric substrate, a radiation surface is printed on the top of the dielectric substrate, a ground plane is printed on the bottom of the dielectric substrate, the radiation surface is communicated with the ground plane through a first rectangular spiral patch short-circuit probe and a second rectangular spiral patch short-circuit probe, the radiation surface is connected with a coaxial feed probe central line of the first rectangular spiral patch and a coaxial feed probe central line of the second rectangular spiral patch, the radiation surface comprises a first rectangular spiral patch and a second rectangular spiral patch, the first rectangular spiral patch and the second rectangular spiral patch form a bent rectangular spiral structure through a bent rectangular gap, the structures are different, and spin angles of the first rectangular spiral patch and the second rectangular spiral patch are different by 180 degrees. The miniaturized self-duplex implanted antenna provided by the invention has the advantages of simple structure, small size, low profile, low coupling, circular polarization and self-duplex.

Inventors

SONG ZHIWEI
WANG YUCHAO
XU XIAOMING

Assignees

新疆大学

Dates

Publication Date: 20260508
Application Date: 20230531

Claims (6)

1. The miniaturized self-duplex implantable antenna is characterized by comprising a dielectric substrate and a covering layer, wherein the covering layer is positioned at the top of the dielectric substrate; The top of the medium substrate is printed with a radiation surface, the bottom of the medium substrate is printed with a ground plane, the radiation surface is communicated with the ground plane through a first rectangular spiral patch short-circuit probe and a second rectangular spiral patch short-circuit probe, and the radiation surface is connected with the center line of the first rectangular spiral patch coaxial feed probe and the center line of the second rectangular spiral patch coaxial feed probe; The radiating surface comprises a first rectangular spiral patch and a second rectangular spiral patch, the first rectangular spiral patch and the second rectangular spiral patch are axially arranged along a y-axis and are not contacted with each other, the first rectangular spiral patch and the second rectangular spiral patch form a bent rectangular spiral structure by arranging a bent rectangular gap, the structures of the first rectangular spiral patch and the second rectangular spiral patch are different, and spin angles of the first rectangular spiral patch and the second rectangular spiral patch differ by 180 degrees; The ground plane is provided with a ground plane rectangular groove, the ground plane rectangular groove axially penetrates through the ground plane along the x axis, and the width of the ground plane rectangular groove is 0.2 mm; The first rectangular spiral patch is sequentially provided with a first rectangular spiral patch rectangular gap (25), a first rectangular spiral patch second rectangular gap (26) and a first rectangular spiral patch third rectangular gap (27) along the negative y-axis direction, the width ratio of the first rectangular spiral patch rectangular gap (25), the first rectangular spiral patch second rectangular gap (26) and the first rectangular spiral patch third rectangular gap (27) is 3:2:4, the second rectangular spiral patch is sequentially provided with a second rectangular spiral patch first rectangular gap (22), a second rectangular spiral patch second rectangular gap (23) and a second rectangular spiral patch third rectangular gap (24) along the positive y-axis direction, and the widths of the second rectangular spiral patch first rectangular gap (22), the second rectangular spiral patch second rectangular gap (23) and the second rectangular spiral patch third rectangular gap (24) are all 0.2 mm; The welding point connection part of the coaxial feed center line of the first rectangular spiral patch and the first rectangular spiral patch is arranged at the connection part of the first impedance matching branch knot and the first rectangular spiral patch, and the welding point connection part of the coaxial feed center line of the second rectangular spiral patch and the second rectangular spiral patch is arranged at the connection part of the second impedance matching branch knot and the second rectangular spiral patch.
2. The miniaturized self-duplex implantable antenna according to claim 1, wherein a first rectangular spiral patch coaxial feed centerline solder joint and a first rectangular spiral patch shorting via Kong Handian are provided on the first rectangular spiral patch, a second rectangular spiral patch coaxial feed centerline solder joint and a second rectangular spiral patch shorting via Kong Handian are provided on the second rectangular spiral patch, the first rectangular spiral patch coaxial feed centerline solder joint is connected to the first rectangular spiral patch coaxial feed probe centerline, the first rectangular spiral patch shorting via solder joint is connected to the first rectangular spiral patch shorting probe, the second rectangular spiral patch coaxial feed centerline solder joint is connected to the second rectangular spiral patch coaxial feed probe centerline, and the second rectangular spiral patch shorting via solder joint is connected to the second rectangular spiral patch shorting probe; The ground plane is provided with a ground plane right half-plane short circuit through Kong Handian, a ground plane right half-plane coaxial feed grounding port, a ground plane left half-plane short circuit through Kong Handian and a ground plane left half-plane coaxial feed grounding port, the ground plane right half-plane short circuit via welding spot is connected with the second rectangular spiral patch short circuit probe, the ground plane right half-plane coaxial feed grounding port is connected with the second rectangular spiral patch coaxial feed probe central line, the ground plane left half-plane short circuit via welding spot is connected with the first rectangular spiral patch short circuit probe, and the ground plane left half-plane coaxial feed grounding port is connected with the first rectangular spiral patch coaxial feed probe central line.
3. The miniaturized self-duplex implantable antenna of claim 2 wherein the first rectangular helical patch coaxial feed center probe and the second rectangular helical patch coaxial feed center probe each have a radius of 0.2 mm and the first rectangular helical patch shorting probe and the second rectangular helical patch shorting probe each have a radius of 0.2 mm.
4. The miniaturized self-duplex implantable antenna according to claim 1, wherein a section of first impedance matching stub is connected to the junction of the first rectangular spiral patch and the first rectangular spiral patch coaxial feed probe centerline along the negative x-axis direction for improving the impedance matching of the antenna, the first impedance matching stub having a width of 0.4 mm; And a section of second impedance matching branch is connected with the joint of the second rectangular spiral patch and the central line of the coaxial feed probe of the second rectangular spiral patch along the negative direction of the y axis and is used for improving the impedance matching of the antenna, the width of the impedance matching branch is 0.4 mm, and the length direction of the second impedance matching branch forms an included angle of 90 degrees with the length direction of the second rectangular spiral patch.
5. The miniaturized self-duplex implantable antenna according to claim 1, wherein the dielectric substrate and cover layer are formed of Rogers 6010 material with a relative permittivity of 10.2.
6. The miniaturized self-duplex implantable antenna according to claim 1, wherein the radiating surface and ground plane are both metallic copper materials.

Description

Miniaturized self-duplex implanted antenna Technical Field The invention relates to the technical field of antennas, in particular to a miniaturized self-duplex implanted antenna applied to biological telemetry and wireless energy transmission. Background Biomedical engineering and personalized health care are rapidly developed nowadays, and research on implantable medical devices by various nations is promoted. The implanted medical equipment replaces the traditional wired connection mode by being implanted into a human body, so that the comfort level and the real-time health data monitoring effect of an implanted patient are greatly improved. The implanted medical device can send pathological data of a patient to the medical receiving device outside the human body, and reliable data support is provided for doctors to make diagnosis and treatment schemes. Currently, as a front-end device for transmitting and receiving data, an implantable antenna has been widely used for an implantable medical device such as a capsule endoscope, a cardiac pacemaker, a brain pacemaker, etc., and is also widely used for an implantable biosensor for detecting and recording blood pressure, blood sugar, heart rate, intracranial pressure, etc. Implantable medical devices and implantable biosensors often require a stable supply of electrical energy. However, both conventional implantable medical devices and implantable biosensors rely on chemical batteries within the device to power the device, which is limited by the energy storage of the batteries and the life of the batteries, and which requires periodic surgical replacement of the batteries of the implantable device. This greatly increases the risk and cost of treatment for the patient. Therefore, the more practical and efficient method of powering implantable medical devices via wireless energy transfer is becoming a hot spot of research. For implantable antennas for bio-telemetry and wireless energy transfer, various nationists have proposed a number of different solutions. In the literature of RADIATIVE NEAR-FIELD WIRELESS Power Transfer to Scalp-Implantable Biotelemetric Device, an author designs a dual-band antenna capable of performing biological telemetry at 915MHz and performing energy transmission at 1.9 GHz, but not solving the problem of duplex operation, and in the literature of Wireless Powering AND TELEMETRY of Deep-Body Ingestible Bioelectronic Capsule, the author proposes a self-duplex dual-band implantable antenna capable of performing biological telemetry at 915MHz and performing energy transmission at 1.3 GHz at the same time, so that duplex operation is realized, but the thickness of a dielectric substrate is only 0.13mm, and the number of short-circuit probes is excessive, so that the difficulty of subsequent antenna processing and manufacturing is improved, and in "Biotelemetry and Wireless Powering of Biomedical Implants Using a Rectifier Integrated Self-Diplexing Implantable Antenna", the author also proposes a self-duplex dual-band implantable antenna capable of performing biological telemetry at 915MHz at 1.47 GHz, but circular polarization is not realized in the biological telemetry frequency band. Therefore, the designed dual-frequency implanted energy transmission antenna has the advantages of simple structure, small size, low section, low coupling, circular polarization and self-duplex, and has higher application value. Disclosure of Invention The invention aims to provide a miniaturized self-duplex implanted antenna which has the advantages of simple structure, small size, low section, low coupling, circular polarization and self-duplex. In order to achieve the above object, the present invention provides the following solutions: a miniaturized self-duplex implantable antenna 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, the radiation surface is communicated with the ground plane through a first rectangular spiral patch short-circuit probe and a second rectangular spiral patch short-circuit probe, and the radiation surface is connected with the center line of the first rectangular spiral patch coaxial feed probe and the center line of the second rectangular spiral patch coaxial feed probe; The radiation surface comprises a first rectangular spiral patch and a second rectangular spiral patch, the first rectangular spiral patch and the second rectangular spiral patch are axially arranged along the y-axis and are not in contact with each other, the first rectangular spiral patch and the second rectangular spiral patch form a bent rectangular spiral structure by arranging a bent rectangular gap, the first rectangular spiral patch and the second rectangular spiral patch are different in structure, and spin angles of the first re