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33 results on '"Hyoung, Chang‐Hee"'

7. Loop-Type Field Probe to Measure Human Body Exposure to 5G Millimeter-Wave Base Stations.

Author

Kwon, DukSoo, Lee, Young Seung, Hyoung, Chang-Hee, Hwang, Jung-Hwan, and Choi, Hyung-Do

Subjects
ELECTRIC measurements, HUMAN body, LOOP antennas, 5G networks, ELECTROMAGNETIC fields
Abstract

This paper proposes a field probe to measure the power density (PD) at a millimeter-wave (mmWave) frequency band. The proposed probe is composed of a loop antenna in which one end is terminated with a load resistor. Such a structure enables the simultaneous measurement of electric (E)- and magnetic (H)-fields: the E-field is measured at a gap where the load resistor is placed, and the H-field is measured through the loop antenna. The simultaneous measurement makes it possible to measure PD for an incident wave even in the near field region where the E- and H-fields have different phases from each other. The proposed probe is fabricated and evaluated for its PD measurement performance. The measurement results show that the probe measures PD with an error less than 1.3 dB. Owing to the near field measurement, the proposed probe is useful in measuring the human body exposure to electromagnetic fields (EMFs) that are generated by 5G mmWave base stations. [ABSTRACT FROM AUTHOR]

Published
2023
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16. List of Contributors

Author

Bajcsy, Ruzena, primary, Barsocchi, Paolo, additional, Benito-Lopez, Fernando, additional, Bertschi, Mattia, additional, Caldani, Laura, additional, Casson, Alexander J., additional, Cauwenberghs, Gert, additional, Chen, Guangwei, additional, Chi, Yu M., additional, Chung, Kyunghee, additional, Coyle, Shirley, additional, Curto, Vincenzo F., additional, Diamond, Dermot, additional, Ding, Xiaorong, additional, Dräger, Tobias, additional, Dunne, Lucy, additional, Dykstra, John, additional, Florea, Larisa, additional, Fontana, Juan M., additional, Ghovanloo, Maysam, additional, Ha, Sohmyung, additional, Huo, Xueliang, additional, Hwang, Jung-Hwan, additional, Hyoung, Chang-Hee, additional, Jafari, Roozbeh, additional, Jayaraman, Sundaresan, additional, Kim, Chul, additional, Korhonen, Ilkka, additional, Kurita, Yuichi, additional, Kuroda, Tomohiro, additional, Lemay, Mathieu, additional, Li, Ming, additional, Loseu, Vitali, additional, Luo, Ningqi, additional, Maglogiannis, I., additional, Makikawa, Masaaki, additional, Mansano, A.L.R., additional, Masuda, Atsuji, additional, Mateu, Loreto, additional, Mayordomo, Iker, additional, Melanson, Ed, additional, Okada, Shima, additional, Pacelli, Maria, additional, Paradiso, Rita, additional, Parak, Jakub, additional, Park, Sungmee, additional, Pollak, Markus, additional, Poon, Carmen C.Y., additional, Potortì, Francesco, additional, Profita, Halley, additional, Renevey, Philippe, additional, Rodriguez-Villegas, Esther, additional, Salvatore, Giovanni, additional, Sandalidis, H.G., additional, Sazonov, Edward, additional, Serdijn, W.A., additional, Seto, Edmund, additional, Shi, Lu, additional, Shiozawa, Naruhiro, additional, Sola, Josep, additional, Stoopman, M., additional, Szuminsky, Neil, additional, Takahashi, Hideya, additional, Tamura, Toshiyo, additional, Tröster, Gerhard, additional, Wu, Jian, additional, Yu, Shucheng, additional, Zeagler, Clint, additional, Zhang, Yuan Ting, additional, and Zheng, Yali, additional

Published
2014
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18. Impact of Absorbers on the Shielding Effectiveness of Metallic Rooms with Apertures

Author

Kwon, Jong Hwa, Hyoung, Chang Hee, Hwang, Jung-Hwan, and Park, Hyun Ho

Subjects
Electromagnetic field, slot, Materials science, Computer Networks and Communications, Aperture, lcsh:TK7800-8360, 02 engineering and technology, aperture, 01 natural sciences, law.invention, Standing wave, Optics, law, 0103 physical sciences, Shielded cable, q-factor, 0202 electrical engineering, electronic engineering, information engineering, absorber, Electrical and Electronic Engineering, 010302 applied physics, Computer simulation, shielding effectiveness, business.industry, lcsh:Electronics, Resonance, 020206 networking & telecommunications, metallic enclosure, resonance, Hardware and Architecture, Control and Systems Engineering, Q factor, Signal Processing, Electromagnetic shielding, standing-wave, business
Abstract

An electromagnetic field penetrating through an aperture or slot of a metallic enclosure generates many standing-waves due to the resonance inside the metallic enclosure, which results in reduced shielding performance. This paper examines the effect of absorbent material (absorber) to improve shielding effectiveness (SE) of large metallic rooms with apertures or slots. First, a theoretical formulation to extract the Q-factor of an absorber with any shape is proposed. Using this, the contribution of the absorber to the SE improvement of a shielded room with different sized circular apertures was investigated. Second, the resonant mode density inside the shielded room was classified into non-resonant, under-moded, and over-moded states with an increase in frequency, and the effect of the absorber in each frequency range was examined. The analysis was conducted through numerical simulation using a commercial full-wave simulator and experimental measurement using a fabricated actual shielded room and commercial absorbers. The accuracy of the analysis results was verified through the comparison of simulated and measured results. The analysis results ensured that the absorber was not effective in improving the SE in the non-resonant state of the metallic room. It was also confirmed that the absorber was effective in improving the SE in the over-moded state of the metallic room where a severe standing-wave occurs. In addition, the SE improvement level differed depending on the location of the absorber in the room.

Published
2021
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24. Improvement of shielding measurement for small‐sized enclosures with consideration to the shielding quality of antenna cables.

Author

Hwang, Jung‐Hwan, Hyoung, Chang Hee, Kwon, Jong Hwa, and Park, Hyun Ho

Subjects
*REVERBERATION chambers, *ANTENNAS (Electronics), *CABLES, *ELECTROMAGNETIC shielding, *MEASUREMENT
Abstract

This article presents an improvement to IEEE 299.1 standard used to measure the shielding effectiveness (SE) of small‐sized metallic enclosures in a reverberation chamber. The shielding quality of radio‐frequency (RF) cables used for SE measurement significantly affects measurement accuracy, especially when metallic enclosures have a high level of SE. A new measurement parameter is introduced to represent a measurable range in which SE can be measured without being affected by the shielding quality of the RF cables. The proposed parameter can be effectively used for the IEEE 299.1‐based SE measurement method to improve measurement accuracy. In our experiments, the utilization of the proposed parameter confirms that the IEEE 299.1 method can measure SE of 87.5 dB up to 4 GHz. Furthermore, to reduce coupled noise through the antenna cable, three different methods are applied together during the shielding measurement of a high‐SE enclosure. Our experimental results show that these methods extend the measurable SE range up to 95 dB at frequencies below 4 GHz. [ABSTRACT FROM AUTHOR]

Published
2021
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33. List of Contributors

Author

Bajcsy, Ruzena, Barsocchi, Paolo, Benito-Lopez, Fernando, Bertschi, Mattia, Caldani, Laura, Casson, Alexander J., Cauwenberghs, Gert, Chen, Guangwei, Chi, Yu M., Chung, Kyunghee, Coyle, Shirley, Curto, Vincenzo F., Diamond, Dermot, Ding, Xiaorong, Dräger, Tobias, Dunne, Lucy, Dykstra, John, Florea, Larisa, Fontana, Juan M., Ghovanloo, Maysam, Ha, Sohmyung, Huo, Xueliang, Hwang, Jung-Hwan, Hyoung, Chang-Hee, Jafari, Roozbeh, Jayaraman, Sundaresan, Kim, Chul, Korhonen, Ilkka, Kurita, Yuichi, Kuroda, Tomohiro, Lemay, Mathieu, Li, Ming, Loseu, Vitali, Luo, Ningqi, Maglogiannis, I., Makikawa, Masaaki, Mansano, A.L.R., Masuda, Atsuji, Mateu, Loreto, Mayordomo, Iker, Melanson, Ed, Okada, Shima, Pacelli, Maria, Paradiso, Rita, Parak, Jakub, Park, Sungmee, Pollak, Markus, Poon, Carmen C.Y., Potortì, Francesco, Profita, Halley, Renevey, Philippe, Rodriguez-Villegas, Esther, Salvatore, Giovanni, Sandalidis, H.G., Sazonov, Edward, Serdijn, W.A., Seto, Edmund, Shi, Lu, Shiozawa, Naruhiro, Sola, Josep, Stoopman, M., Szuminsky, Neil, Takahashi, Hideya, Tamura, Toshiyo, Tröster, Gerhard, Wu, Jian, Yu, Shucheng, Zeagler, Clint, Zhang, Yuan Ting, and Zheng, Yali

Published
2015
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