Volume 14 Issue 5
Sep.  2021
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Chinese Optics  > 2021  >  14(5): 1169-1176.
OU Ren-xia, YOU Ming-hui, FANG Ji-bo, LI Jun-yao. Design of a graphene-based wide-band circular polarized antenna for capsule endoscopes[J]. Chinese Optics, 2021, 14(5): 1169-1176. doi: 10.37188/CO.2021-0005
Citation: OU Ren-xia, YOU Ming-hui, FANG Ji-bo, LI Jun-yao. Design of a graphene-based wide-band circular polarized antenna for capsule endoscopes[J]. Chinese Optics, 2021, 14(5): 1169-1176. doi: 10.37188/CO.2021-0005
shu

Design of a graphene-based wide-band circular polarized antenna for capsule endoscopes

  • 1.

    Biomedical Engineering College, Jilin Medical College, Jilin 132013, China

  • 2.

    Information Technology College, Jilin Agricultural University, Changchun 130018, China

Funds:  Supported by Project of Education Department of Jilin Province (No. JKH20191316KJ)
More Information
  • Corresponding author: 52083926@qq.com
  • Received Date: 13 Jan 2021
  • Rev Recd Date: 22 Feb 2021
    • Available Online: 30 Apr 2021
  • Publish Date: 18 Sep 2021
    Abstract
  • In order to improve the performance of the capsule endoscope antenna and its anti-interference ability and compatibility, and further reduce its size, a graphene-based and wide-band circular polarized antenna for capsule endoscopes is designed. The antenna is composed of three layers of radiation units and a floor. By making use of the excellent electrical conductivity of multi-layer graphene film, the radiation units and the floor of each layer of the antenna can enhance the working bandwidth and gain of a capsule antenna, improve the transmission efficiency and effectively reduce the loss. Four short-circuit probes are used to connect the radiation units of first layer and second layer to form a composite spiral antenna, thus generating circular polarization characteristics, which can not only reduce bit error rate but also inhibit multipath interference. In addition, it can couple electromagnetic energy, improve impedance matching and adjust the purity of circular polarization. The effects of the size of the radiation units of first, second and third layers on the performance of the antenna, such as the size of the opening ring, the thickness of the multilayer graphene film, and the antenna intake environment of the stomach, small intestine and colon are analyzed in detail. The test results show that the antenna volume is only π×4.52×1.905 mm3, the impedance bandwidth is 2.2~2.78 GHz, the axial ratio bandwidth is 2.26~2.66 GHz, and the gain is −22.9 dBi. The actual measurement results agree well with the simulation results, and the radiation characteristics in the working frequency band are stable. Compared with the existing technology, this antenna is more compatible and its functional bandwidth is wider. The antenna has a wide band, circular polarization, good anti-interference, good electromagnetic compatibility and a small volume. The antenna is suitable for the ISM 2.4 GHz band, which can meet the working requirements of a capsule endoscope intake for different digestive organs.

     

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