• Title/Summary/Keyword: Meandered Loop Antenna

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An Ultra-Wideband Conformal Meandered Loop Antenna for Wireless Capsule Endoscopy

  • Soyeon Kim;Hyunchol Shin
    • Journal of electromagnetic engineering and science
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    • v.19 no.2
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    • pp.101-106
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    • 2019
  • This work presents an ultra-wideband conformal meandered loop antenna for wireless capsule endoscopy applications. The proposed antenna surrounds the outer wall of a capsule, so that the inner space can be used by a battery and other electrical and optical components. Fabricated on a flexible substrate, the antenna has a diameter of 10 mm and a height of 14 mm when wrapped around a cylindrical capsule. The antenna achieves an ultra-wide impedance bandwidth of 200 MHz-2.05 GHz (164% of the fractional bandwidth), which provides sufficient coverage for the medical implant communication service, MedRadio, and industrial-scientific-medical (ISM) bands. This antenna also ensures robustness to the detuning effect, which could be caused by the inner components of the capsule and the outer environment variations. The omnidirectional radiation pattern of the antenna is verified by simulations and measurements, and its maximum gain is -31.5 dBi. The fabricated antenna is successfully tested in an over-the-air wireless communication link, proving that the antenna can be instrumental in wireless capsule endoscopy applications.

Design of the Open-Loop Combined Meandered-Line 1-Layer Radiator for Diversity Antennas with Size-Reduction and Improved Isolation (다이버시티 안테나의 소형화와 격리도 향상을 위한 미앤더 선로와 개방형 루프가 결합된 방사구조의 설계)

  • Mok, Se-Gyoon;Kahng, Sung-Tek;Kim, Yong-Jin
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.1
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    • pp.110-116
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    • 2012
  • This paper proposes a new diversity antenna which is the base of MIMO, tunable and reconfigurable antennas. The antenna has a small size and high inter-antenna isolation resulting from the compact radiating element comprising a meandered line and an open-loop combined in one limited uniplanar space and a modified T-shaped decoupling structure, respectively. In a WiMAX band, the radiating element and the entire antenna are $0.092{\lambda}$ and $0.2216{\lambda}$ in size, which shows effective size-reduction and the gain and efficiency of the proposed antenna attached to the ground of a handheld device are 3.7dBi and 56% acceptable to the industrial standard.