Ick-Jae Yoon

Prof. Ick-Jae Yoon

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Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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23 June 2011 in IEEE Antennas and Wireless Propagation Letters
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Journal Article
Closed access
IYIck-Jae Yoon
Ick-Jae Yoon
HLHao Ling
Hao Ling
We derive the upper bound for wireless power transfer in the near-field region under the multiple-transmitter scenario. It is found that a stable region in power transfer efficiency (PTE) can be created for sufficiently close spacing between two transmitters, in contrast to the monotonic decay of the single-transmitter case. We next demonstrate through simulation and measurement that such a bound can be approached by using efficient, electrically small, folded cylindrical helix dipoles. The measurement shows a 17% PTE value over a 0.3λ region between the two transmitters, corroborating the theory and simulation. Results from the four-transmitter case show that the stable PTE region can be extended to two-dimensional space.
26 May 2005 in Electronics Letters
Verified
Journal Article
Closed access
IYIck-Jae Yoon
Ick-Jae Yoon
HKH. Kim
H. Kim
HYH.K. Yoon
H.K. Yoon
YYY.J. Yoon
Y.J. Yoon
YKY.-H. Kim
Y.-H. Kim
A novel ultra-wideband (UWB) tapered slot antenna (TSA) is proposed that has both enhanced impedance bandwidth enough to cover UWB systems and band cutoff characteristic of 5 GHz WLAN band limited by IEEE802.11a and HIPERLAN/2. To achieve these two characteristics of wide bandwidth and partial band cutoff at the TSA, a broadband microstrip–slotline transition with multi-arm stubs and λ/4 short stubs, respectively, is used. From measured results, it is observed that wide bandwidth of about 2 octaves from 2.8 to 11.09 GHz for the VSWR<2 is achieved, while 5.05–5.93 GHz is cutoff with the radiated power of this cutoff band effectively suppressed as about −9 dB for the peak power level of other bands.
23 March 2021 in IEEE Antennas and Wireless Propagation Letters
Verified
Journal Article
Closed access
TTTuan-Anh Le Trong
Tuan-Anh Le Trong
SSSyed Imran Hussain Shah
Syed Imran Hussain Shah
GSGeonyeong Shin
Geonyeong Shin
SRSONAPREETHA MOHAN RADHA
SONAPREETHA MOHAN RADHA
IYIck-Jae Yoon
Ick-Jae Yoon
This letter presents a compact triple-band antenna composed of a spiral radiator with an open-ended slot at the ground for human head-implantable wireless communications. It operates simultaneously at a Medical Implant Communications Service (MICS) band (402-405 MHz), a Wireless Medical Telemetry Service (WMTS) band (1427-1432 MHz), and an Industrial, Scientific, and Medical (ISM) band (2400-2480 MHz). The proposed antenna has a thin profile of 0.5 mm with a volume of 197 mm 3 . Semisolid phantoms are used for the design and experimental validation, and detailed parameter studies are carried out to determine the working principles of the antenna. Based on simulations and measurements, it was found that the proposed antenna covers all the desired frequency bands with comparably high boresight gains given its compact dimensions.
19 August 2010 in IEEE Antennas and Wireless Propagation Letters
Verified
Journal Article
Closed access
IYIck-Jae Yoon
Ick-Jae Yoon
HLHao Ling
Hao Ling
We demonstrate that electrically small antennas can be designed to approach the recently derived theoretical bounds for wireless power transfer. Short dipole coupling is first simulated to determine the antenna design specifications for efficient coupling beyond the coupled mode region. Electrically small (kr=0.31) but highly efficient folded cylindrical helix (FCH) dipoles with 50- input impedance are designed. The power transfer efficiency (PTE) between two such antennas is simulated for the colinear and parallel configurations. Two FCH dipoles are constructed, and the PTE between them is measured and compared to the simulation. The measured results show a PTE of 40% at a distance of 0.25 (0.39 m at 195 MHz) in the colinear configuration.
10 November 2020 in IEEE Antennas and Wireless Propagation Letters
Verified
Journal Article
Closed access
SRSONAPREETHA MOHAN RADHA
SONAPREETHA MOHAN RADHA
GSGeonyeong Shin
Geonyeong Shin
WKWonkyo Kim
Wonkyo Kim
SSSyed Imran Hussain Shah
Syed Imran Hussain Shah
IYIck-Jae Yoon
Ick-Jae Yoon
A novel design of an electrically small, dual-band quasi-isotropic antenna with a microstrip balun is presented. A quasi-isotropic radiation pattern is realized from the total current flow over the proposed structure at two different frequency bands. The electrical size ka of the antenna is 0.49 with an extremely thin profile of 0.0014g. The antenna measurements reveal good uniformity of the radiation pattern with a maximum gain deviation of 5.83 dB at 942 MHz and 8.24 dB at 1.71 GHz with 57% and 95% radiation efficiency, respectively. The radiation performance of the antenna is also verified through wireless power receiving experiments in an office non-line-of-sight environment.
24 August 2012 in IEEE Transactions on Antennas and Propagation
Verified
Journal Article
Closed access
IYIck-Jae Yoon
Ick-Jae Yoon
HLHao Ling
Hao Ling
We derive an analytic upper bound in power transfer efficiency (PTE) for wireless power transfer between a pair of antennas separated by a spherical material shell. The formulation is based on the free space PTE bound derived previously, and incorporates an additional pair of incoming and outgoing spherical waves within the shell. The derived PTE bounds are verified using numerical simulation via FEKO and show good agreement for both TM mode and TE mode radiators. Using the derived theory, lossy dielectric material effects on wireless power transfer are studied. Power transfer measurements through walls are also reported and compared with the theory.