Broadband conformal circularly polarized antenna and capsule endoscope

A circularly polarized antenna and broadband technology, applied in the field of biomedical telemetry, can solve the problems of antenna deviation from the working frequency band, large internal space of the capsule, and polarization mismatch, etc., to extend the effective path of the current, save the internal space, and reduce the emission The effect of different reactions

Pending Publication Date: 2022-03-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] At present, in the design of antennas used in capsule endoscopy systems, linearly polarized antennas are mostly used, and linearly polarized antennas usually have the problem of polarization mismatch caused by the movement of the capsule in the human body.
In practical applications, the actual performance of the antenna is susceptible to frequency deviation due to changes in the organs of the digestive tract, and antennas with narrower bandwidths tend to deviate from the required working frequency band in practical applications
In addition, some designs also have the problem of occupying a large space inside the capsule

Method used

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  • Broadband conformal circularly polarized antenna and capsule endoscope
  • Broadband conformal circularly polarized antenna and capsule endoscope
  • Broadband conformal circularly polarized antenna and capsule endoscope

Examples

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Embodiment 1

[0033] In this embodiment, one side is opposite to the other side, one side is specifically the upper surface, and the other side is the lower surface.

[0034] Such as Figure 1-Figure 4 As shown, a broadband conformal circularly polarized antenna includes a dielectric substrate 6 and a coaxial feeding structure 5. The dielectric substrate 6 is a semi-flexible dielectric substrate, specifically cylindrical. The upper surface of the dielectric substrate is provided with an upper layer patch unit 3 , and its lower surface is provided with a lower layer patch unit 4 .

[0035] Such as Figure 5 As shown, the upper patch unit includes a pair of crossed dipole arms and a rectangular patch 7, the crossing angle of the two dipole arms is 90 degrees, and the two dipole arms pass through a three-quarter opening circle The ring 8 is connected, and the ends of the two dipole arms are respectively connected to the two ends of the opening. The dimensions of the inner and outer diameter...

Embodiment 2

[0047] A capsule endoscope, comprising the broadband conformal circularly polarized antenna as described in Embodiment 1, the broadband conformal circularly polarized antenna 2 is conformal to the inner wall of the capsule shell 1, and the thickness of the capsule shell 1 is 0.5 mm, the outer radius after conformal is 5mm, and the inner radius is 4.746mm. The capsule shell 1 is made of acrylic, with a relative dielectric constant of 3, an electrical loss tangent of 0.001, a thickness of 0.5 mm, an inner radius of 5 mm, and a total length of 26 mm.

[0048]Capsule shell 1 is made of biocompatible materials, which can isolate human tissue and resist gastric acid corrosion, and serve as a protective layer for capsule antennas and internal electronic components

[0049] Such as Figure 7 As shown, the -10dB impedance bandwidth of the antenna is: 2.31-3.41GHz, the absolute bandwidth is 1.1GHz, and the relative bandwidth is 38.5%; the 3dB circular polarization bandwidth is 2.36-3.4...

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Abstract

The broadband conformal circularly polarized antenna comprises a dielectric substrate and a coaxial feed structure, one surface of the dielectric substrate is provided with an upper-layer patch unit, the other surface of the dielectric substrate is provided with a lower-layer patch unit, the upper-layer patch unit and the lower-layer patch unit respectively comprise a pair of crossed dipole arms and a rectangular patch, and the rectangular patch is arranged on the upper-layer patch unit. And the coaxial feed structure is used for feeding the upper-layer patch unit and the lower-layer patch unit. The invention has the advantages of conformality, large bandwidth, polarization mismatch resistance, small occupied internal volume of the capsule, biocompatibility and the like, and can be applied to capsule endoscopes in the field of wireless medical telemetry.

Description

technical field [0001] The invention relates to the field of biomedical telemetry, in particular to a broadband conformal circularly polarized antenna and a capsule endoscope. Background technique [0002] With the development of wireless communication technology, implantable medical devices are widely used in modern medicine. The implantable capsule antenna is used to transmit the data and images collected by medical equipment in the human body to the receiving device outside the body. The performance of the antenna will directly affect the quality of wireless information transmission. As an important part of the wireless endoscope system, the capsule antenna plays an irreplaceable role. [0003] Currently, in the design of antennas used in capsule endoscope systems, linearly polarized antennas are mostly used, and linearly polarized antennas usually have the problem of polarization mismatch caused by the movement of the capsule in the human body. In practical application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q9/04H01Q1/52H01Q1/36A61B1/04
CPCH01Q9/0464H01Q1/36H01Q1/52A61B1/041
Inventor 刘雄英李鑫宁
Owner SOUTH CHINA UNIV OF TECH
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