Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band

A circularly polarized antenna and differential feeding technology, which is applied in the field of biomedical telemetry, can solve the problems of antenna gain reduction and loss, and achieve the effects of reducing antenna size, improving radiation efficiency, and suppressing common-mode noise

Active Publication Date: 2016-02-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the ISM belongs to the radio frequency band, the electromagnetic waves emitted or received by the antenna will cause serious loss due to human tissue, resulting in a decrease in antenna gain, which poses challenges to the miniaturization design of the antenna

Method used

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  • Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band
  • Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band
  • Differential feed implantable circularly polarized antenna working in ISM (Industrial Scientific Medical) frequency band

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Embodiment

[0023] Such as Figure 1(a) ~ Figure 1(c) As shown, a differentially fed implantable circularly polarized antenna operating in the ISM frequency band includes upper and lower dielectric substrates 1A, 1B, antenna radiation unit 2, symmetrical coaxial and floor 4, and the antenna radiation unit is located at two In the middle of the layer dielectric substrate, the floor 4 is located on the lower surface of the lower dielectric substrate 1B. The antenna radiation unit 2 is composed of four symmetrical slits (5A, 5B, 6A, 6B) and a square patch with a slot in the center. The floor Cross slots were made on the diagonal and the antenna was simulated in a single layer tissue model.

[0024] The square patch of the antenna radiating unit 2 has a square cutout with a symmetrical triangular cut in the center, the side length r=3.5mm, the side length of the square cutout Lc=9.3mm, and the symmetrical cutout Including the lower right cut corner 3A and the upper left cut corner 3B respect...

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Abstract

The present invention discloses a differential feed implantable circularly polarized antenna working in an ISM (Industrial Scientific Medical) frequency band. The differential feed implantable circularly polarized antenna comprises an upper layer dielectric substrate, a lower layer dielectric substrate, an antenna radiation unit, a symmetrical coaxial and a floor. The antenna radiation unit is located between two layers of dielectric substrates; the floor is located below the lower layer dielectric substrate; and the symmetrical coaxial includes an upper right coaxial and a lower left upper coaxial, the upper right coaxial and the lower left upper coaxial are located at the diagonal of the antenna radiation unit and are centrally symmetrical with respect to the dielectric substrates. According to the invention, a current path is effectively prolonged, the size of an antenna is reduced, and circular polarization is generated so that multipath loss and polarization mismatch of signals may be effectively inhibited. The differential feed implantable circularly polarized antenna working in an ISM (Industrial Scientific Medical) frequency band has small size, wide axial ratio bandwidth and the like, and is applicable to the field of the human body local area network communication.

Description

technical field [0001] The invention relates to the field of biomedical telemetry, in particular to a differential feeding implantable circularly polarized antenna working in the ISM frequency band. Background technique [0002] Wireless implantable devices can transmit data to health and medical centers outside the body, which can help doctors in remote places diagnose patients' conditions at any time and provide more timely treatment. Today, thanks to the development of implantable antennas, we can monitor patients remotely even without physical contact. [0003] By using circular polarization technology, multipath loss and polarization mismatch can be effectively suppressed when using far-field radio frequency connection telemetry technology. Compared with linear polarization, circular polarization can reduce the bit error rate of data transmission and reduce polarization mismatch. [0004] In recent years, implantable circularly polarized antennas have become more and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/48H01Q1/50H01Q1/38
Inventor 刘雄英李兵杨贤涛
Owner SOUTH CHINA UNIV OF TECH
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