Conclusion

B. Performances of fabricated antenna

V. Conclusion

In this study, an inverted-F antenna was proposed for a capsule endoscope [25]. The proposed antenna can be integrated on the same side with a camera inside a capsule endoscope. Various electronic components, such as a camera and LEDs, can affect the antenna's performance including its return loss and radiation pattern. The antenna's performance was simulated to investigate the effect of the electronic components. The simulation results show that the ground plane of the proposed antenna prevents coupling with

the electronic components. The human phantom for the simulation was a homogeneous one consisting of deionized water. The fabricated antenna has a height and a radius of 0.614 and 5.25 mm, respectively. The fabricated antenna operates at 2.386 GHz while having the bandwidth of 151 MHz. It has average and the maximum gains of -7.99 and -3.13 dBi, respectively.

The fabricated antenna has an isotropic radiation pattern.

The proposed antenna satisfies the basic requirements that can be used in capsule endoscope. It has an omni-directional radiation pattern for constant data transmission efficiency in any position and direction. And it has a wide bandwidth considering the frequency shift caused by the complexity of human body. It is also suitable for capsule endoscopes with optimized antenna size.

The proposed antenna has several advantages compared with the existing microstripline antenna. The proposed antenna operates at 2.4 GHz, which is higher than that of conventional micro strip line antenna, and has a bandwidth of about 2 times. Therefore, a higher data rate is guaranteed when data is transmitted from the capsule endoscope to the outside. The existing microstripline antenna occupies much space of capsule surface and does not effectively protect the interfere with radiation characteristics of antenna. On the contrary, the proposed antenna has a structure that can effectively prevent the interference of the electronic devices while satisfying the optimized size.

The proposed antenna has a performance that is satisfactory enough to be used as a transmitting antenna for a capsule endoscope while occupying a small space inside a capsule endoscope. Accurate disease diagnosis in the digestive tract is possible with a capsule endoscope equipped with the proposed antenna.

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List of Publications

Paper

1. Se Woong Kim, Jong Jin Baek, Youn Tae Kim, “A study of camera-integrated inverted F antenna for capsule endoscope”, submitted to Antenna and Wireless Propagation Letters.

2. Se Woong Kim, Jong Jin Baek, Kun Ho Park, Min Joo Jeong, Youn Tae Kim, "Ring-shaped camera-integratable antenna for capsule endoscope", submitted to Electronics Letters, Nov. 19, 2018.

3. Min Joo Jeong, Kun Ho Park, Jong Jin Baek, Se Woong Kim, and Youn Tae Kim, “Wireless charging with textiles through harvesting and storing energy from body movement”, Textile Research Journal, First Published March 1, 2018.

DOI:10.1177/0040517518760759

4. Kunho Park, Min Joo Jeong, Jong Jin Baek, Se Woong Kim, and Youn Tae Kim, “BER Performance of Human Body Communicatons using FSDT”, IEICE Trans. Commun., Aug. 2018 DOI:10.1587/transcom.2018EBP3053

5. Jong Jin Baek, Se Woong Kim, Kun Ho Park, Min Joo Jeong,

and Youn Tae Kim, “Design and Performance Evaluation of

13.56-MHz Passive RFID for E-skin Sensor Application”,

Microwave and Wireless Components Letters, Oct 11. 2018.

List of Publications

Patent

1. “Apparatus for transferring power wireless using capacitively- coupled method and clothes comprising thereof", Y. T. Kim, J. H.

Lee, K. H. Park, M. J. Jeong, J. J. Baek, S. W. Kim, KR (10-1866176)

2. “Apparatus and method of charging mobile terminal using energy harvesting device", Y. T. Kim, M. J. Jeong, K. H. Park, J. J.

Baek, J. H. Lee, S. W. Kim, KR (10-2016-0032004)

3. “Apparatus and method of charging mobile terminal using energy harvesting device", Y. T. Kim, J. H. Lee, K. H. Park, M. J.

Jeong, J. J. Baek, S. W. Kim, U.S.A (15/351,651)

4. “Loop antenna module for capsule-type endoscope and capsule- type endoscope comprising thereof”, Y. T. Kim, S. W. Kim, J. J.

Baek, J. H. Lee, KR (10-1905589)

5. “Loop antenna module for capsule-type endoscope and capsule- type endoscope comprising thereof”, Y. T. Kim, S. W. Kim, J. J.

Baek, J. H. Lee, USA (15/848,046)

List of Publications

Conference

1. “Design of Camera-integrated 2.4-GHz Loop Antenna for Wireless Endoscope ”, S. W. Kim, J. H. Lee, J. J. Baek, Y. T.

Kim, AP-S/URSI, July. 2017

2. “Design of inverted F antenna for capsule endoscope”, S. W.

Kim, J. J. Baek, Y. T. Kim, AP-S/URSI, July. 2018

3. “Optimal impedance matching for power and data transmission in wearable devices”, J. J. Baek, S. W. Kim, J. H. Lee, Y. T. Kim, AP-S/URSI, July. 2017

4. “Passive RFID for wearable system between a patchable tag and a textile reader”, J. J. Baek, S. W. Kim, Y. T. Kim, AP-S/URSI, July. 2018.

5. “Analysis on frequency-dependency of conductive signal transmission channel for biosensor network", J. H. LEE, K. H. Park, M. J. Jeong, J.

J. Baek, S. W. Kim, Y. T. Kim, IEEE Sensors 2016, Nov. 2016.