# 캡슐 내시경에 응용 가능한 광대역 컨포멀 안테나

• Accepted : 2017.05.30
• Published : 2017.06.01

#### Abstract

In this study, a novel wideband conformal thin antenna is presented for endoscopic capsule application at the 915 MHz Industrial, Scientific and Medical (ISM) band. The thickness of the antenna is only 0.2 mm which can be wrapped inside a capsule's inner wall. By cutting meandered slots on patch, open end slots on ground and utilizing long arm, the proposed antenna can obtain significant size reduction. The net volume of the proposed antenna including substrate and superstrate is only $37.4mm^3$ ($187mm^2$ surface area). This conformal antenna has shown good performance through simulation and measurement with maximum gain of -23 dBi and wide bandwidth from 137 MHz - 205 MHz depending on different environment. In addition, the effect of internal materials specially metallic battery is discussed briefly.

#### Acknowledgement

Supported by : National Research Foundation of Korea (NRF)

#### References

1. M. R. Yuce, and T. Dissanayake, "Easy-to-swallow wireless telemetry," IEEE Microw. Mag., vol. 13, no. 6, pp. 90-101, 2012. https://doi.org/10.1109/MMM.2012.2205833
2. P. M. Izdebski, H. Rajagopalan, and Y. Rahmat-Samii, "Conformal ingestible capsule antenna: A novel chandelier meandered design," IEEE Trans. Antennas Propag, vol. 57, no. 4, pp. 900-909, Apr. 2009. https://doi.org/10.1109/TAP.2009.2014598
3. L. C. Chirwa, P. A. Hammond, S. Roy, and D. R. S. Cumming, "Electromagnetic radiation from ingested sources in the human intestine between 150 MHz and 1.2 GHz," IEEE Trans. Biomed. Eng., vol. 50, no. 4, pp. 484-492, Apr. 2003. https://doi.org/10.1109/TBME.2003.809474
4. S. Y. Shin, H. S. Park, and W. H. Kwon, "Mutual interference analysis of IEEE 802.15.4 and IEEE 802.11b," Comput. Netw., vol. 51, pp. 3338-3353, Aug. 2007. https://doi.org/10.1016/j.comnet.2007.01.034
5. C. Liu, Y. X. Guo, and S. Xiao, "Circularly Polarized Helical Antenna for ISM-Band Ingestible Capsule Endoscope Systems," IEEE Trans. Antennas Propag, vol. 62, no. 12, pp. 6027-6039, Dec. 2014. https://doi.org/10.1109/TAP.2014.2364074
6. S. Gabriel, R. W. Lau, and C. Gabriel, "The dielectric properties of biological tissues: III. parametric models for the dielectric spectrum of tissues," Phys. Med. Biol., vol. 41, pp. 2271-2293, Nov. 1996. https://doi.org/10.1088/0031-9155/41/11/003