Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Seok Joo Doo"'
Publikováno v:
AIP Advances, Vol 13, Iss 3, Pp 035011-035011-5 (2023)
We report a liquid metal microstrip antenna on a printing paper whose resonant frequency was tunable by folding the paper. The gallium-based alloy was used as liquid metal, which is instantly oxidized in ambient air. The oxidized liquid metal is easi
Externí odkaz:
https://doaj.org/article/89a6131eebc646cba8230498a07595f1
Autor:
Seok Joo Doo, José Cruz Núñez Pérez, Robert Pond, Jose Alejandro Galaviz-Aguilar, Chenggang Xie, Hsiu-Chen Chang, Patrick Roblin
Publikováno v:
2017 IEEE MTT-S International Microwave Symposium (IMS).
Model-based nonlinear embedding is applied for the first time to the design of an asymmetrically-driven class-F Chireix power amplifier (PA). The embedding model of a 15 W GaN HEMT is used to determine the optimum load impedances for the fundamental
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::882d7b98e0ba775e1a18d0fd912864a1
https://doi.org/10.1109/mwsym.2017.8058741
https://doi.org/10.1109/mwsym.2017.8058741
Publikováno v:
IEEE Microwave Magazine. 12:65-76
In this article, we have reviewed various advanced broadband and pulsed measurement techniques which have been developed for sampler-based NVNAs. We have seen that the RF modulation capability of sampler based NVNAs was not limited by the IF bandwidt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ff09447e6a3575bf1345514df20df131
https://doi.org/10.1109/mmm.2010.940103
https://doi.org/10.1109/mmm.2010.940103
Publikováno v:
The European Physical Journal Applied Physics. 81:20902
We report an oxidized liquid metal droplet-based energy harvester that converts acoustic energy into electrical energy by modulating an electrical double layer that originates from the deformation of the oxidized liquid metal droplet. Gallium-based l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::59500ec573a76ef54be05c7c85bee539
https://doi.org/10.1051/epjap/2018180011
https://doi.org/10.1051/epjap/2018180011
Autor:
Gregg H. Jessen, Venkatesh Balasubramanian, Jean-Pierre Teyssier, Richard J. K. Taylor, Patrick Roblin, J. Strahler, Krishnanshu Dandu, Seok Joo Doo
Publikováno v:
IEEE Transactions on Microwave Theory and Techniques. 57:881-889
A novel pulsed class-B load-pull measurement system is developed to characterize GaN HEMTs targeting the design of high-efficiency class-B or class-C power amplifiers operating under a pulsed-bias and pulsed-RF (pulsed-IV/RF) condition. Based on a la
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1cf7e82dc21d4687812aebc6a70f30f1
https://doi.org/10.1109/tmtt.2009.2015111
https://doi.org/10.1109/tmtt.2009.2015111
Publikováno v:
IEEE Transactions on Electromagnetic Compatibility. 50:849-860
We present the performance of an RF amplifier and digital modulation techniques in the presence of high-power electromagnetic interference (EMI) to provide existing and next generation communication systems with critical information. An advanced meas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::190d86aa09e64c429fb9e3864621a8eb
https://doi.org/10.1109/temc.2008.2004600
https://doi.org/10.1109/temc.2008.2004600
Autor:
Semyoung Oh, Seok Joo Doo, Woojin Lee, Heong Sup Won, Sang Kug Chung, Jinpyo Jeon, Gil-Young Lee, Jeong-Bong Lee, Daeyoung Kim
Publikováno v:
The European Physical Journal Applied Physics. 78:11101
We investigated frequency tunability of a microfluidic-based antenna using on-demand manipulation of a gallium-based liquid metal alloy. The fluidic antenna was fabricated by polydimethylsiloxane (PDMS) and filled with the gallium-based liquid metal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5d33fe2f6aa0dc92314bb374ae13461f
https://doi.org/10.1051/epjap/2017160346
https://doi.org/10.1051/epjap/2017160346
Publikováno v:
IEEE Microwave and Wireless Components Letters. 18:266-268
In this work, a high efficiency p-HEMT radio frequency power amplifier (PA) is designed using a new multiharmonic real-time active load-pull using the large signal network analyzer. This technique synthesizes a large set of instantaneous load mismatc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::496ad44c93ee6cc1277474ce83558f97
https://doi.org/10.1109/lmwc.2008.918913
https://doi.org/10.1109/lmwc.2008.918913
Autor:
James K. Gillespie, Robert C. Fitch, Jon King, Gregg H. Jessen, G. Simpson, Patrick Roblin, Seok Joo Doo, Neil Moser, Antonio Crespo
Publikováno v:
IEEE Microwave and Wireless Components Letters. 16:681-683
IV knee walk-out in AlGaN/GaN high electron mobility transistors (HEMTs) on a Sapphire substrate is analyzed using dynamic radio frequency (RF) load-lines acquired with a large signal network analyzer (LSNA) for both continuous-wave (CW) and pulsed-I
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0a69f8907e4be7d38dbb2b97162939f6
https://doi.org/10.1109/lmwc.2006.885632
https://doi.org/10.1109/lmwc.2006.885632
Autor:
Patrick Roblin, Youngseo Ko, Marc Vanden Bossche, Chieh-Kai Yang, Fabien De Groote, Jean-Pierre Teyssier, Seok Joo Doo
Publikováno v:
2009 73rd ARFTG Microwave Measurement Conference.
Real-time active load-pull (RTALP) characterization of power transistors with a large signal network analyzer (LSNA) has the benefit of greatly accelerating the design of power amplifiers. However RTALP has been so far limited to devices operating un
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::540f080034766967c0bc06360bfef61e
https://doi.org/10.1109/arftg.2009.5278072
https://doi.org/10.1109/arftg.2009.5278072