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RISS 인기검색어
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- 저자 : Yook Jong-Gwan (검색결과 237 건)
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Analysis of EMI Problems in Plit Power Distribution Network
Jong-Gwan Yook,Han-Kyu Park,Hwang-Yoon Shim,Ji-Seong Kim 한국전자파학회JEES 2002 Journal of Electromagnetic Engineering and Science Vol.2 No.2
Signal integrity problems and their possible solutions are addressed in this paper for split power plane of high-speed digital systems. Stitching and decoupling capacitors are proved to be very effective for reducing signal noise, ground bounce as well as electromagnetic radiation from the split power plane. Simulations based on 3D-Finite Difference Time Domain(FDTD) method are utilized for the analysis of practical high frequency multi-layered PC main board.
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Modified Slot-Loaded Multi-Band Microstrip Patch Antenna
Jong-Gwan Yook,Han-Kyu Park,Man-Shik Cho,Il-Kwon Kim,Han-Back Cho 한국전자파학회JEES 2003 Journal of Electromagnetic Engineering and Science Vol.3 No.1
In this paper, a triple-band planar antenna is proposed for the application to miniaturized automobile safety devices operating at X band(10.5 GHz), K band(24.15 GHz), and Ka band(34.3 GHz). The frequency ratio between the resonant frequencies of this antenna can be adjusted from 1.99 to 2.23 for both X band and K band by varying its slit length. Parasitic elements are added on the modified slot loaded antenna to obtain the third resonance. From numerical as well as experimental results, it has been confirmed that this type of antenna is appropriate for planar multi-band antenna systems.
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Jong Hwa Kwon,Dong Uk Sim,Sang Il Kwak,Jong Gwan Yook IEEE 2010 IEEE transactions on electromagnetic compatibility Vol.52 No.2
<P>To supply high-speed digital circuits with stable power, power/ground noise, such as simultaneous switching noise (SSN) and ground bounce noise caused in multilayer printed circuit boards (PCBs) and packages need to be sufficiently suppressed. The electromagnetic bandgap (EBG) is widely recognized as a good solution for suppressing the propagation of SSN in the gigahertz range. However, a typical coplanar EBG structure etched onto the power and ground planes may degrade the quality of high-speed signals passing over the perforated reference plane. In this paper, a novel method of arranging EBG unit cells on both the power/ground planes in multilayer PCBs and packages is proposed, not only as a means of sufficiently suppressing the propagation of power noise, but also as a means of minimizing the effect of EBG-patterned reference planes on a high-speed signal. On the assumption that noise sources and noise-sensitive devices exist only in specific areas, the proposed method partially positions EBG unit cells only near these critical areas. The SSN suppression performance of the proposed structure is verified by conducting simulations and measurements in the time and frequency domains. Furthermore, signal quality is investigated to verify whether the proposed EBG-patterned reference planes are superior to conventional EBG-patterned planes in terms of signal integrity.</P>
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KWON, Jong Hwa,SIM, Dong Uk,KWAK, Sang Il,YOOK, Jong Gwan The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.6
<P>To build a stable power distribution network for high-speed digital systems, simultaneous switching noise (SSN) should be sufficiently suppressed in multi-layer PCBs and packages. In this paper, a novel hybrid uni-planar compact electromagnetic bandgap (UC-EBG) with two triangular-type unit cells designed on power/ground planes is proposed for the ultra-broadband suppression of SSN. The SSN suppression performance of the proposed structure is validated both numerically and experimentally. A -35dB suppression bandwidth for SSN is achieved, starting at 800MHz and extending to 15GHz and beyond, thereby covering almost the entire noise band.</P>
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Kwon, Jong-Hwa,Sim, Dong-Uk,Kwak, Sang-Il,Gwan Yook, Jong Wiley Subscription Services, Inc., A Wiley Company 2009 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.51 No.5
<P>To build a stable power distribution network for high-speed digital systems, simultaneous switching noise (SSN) in multilayer PCBs and packages needs to be sufficiently suppressed. In this article, a novel triangular-type uniplanar compact electromagnetic band-gap with different bridges designed for power/ground planes is proposed for the ultra-broadband suppression of SSN. The SSN suppression performance of the proposed structure is validated both numerically and experimentally. A −30 dB suppression bandwidth for SSN is achieved starting at 800 MHz and extending to 15 GHz and beyond, that is, almost the entire noise band. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 1356–1358, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24322</P>
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KWON, Jong Hwa,YOOK, Jong Gwan The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.7
<P>In this paper, a novel method of partially placing electromagnetic band-gap (EBG) unit cells on both the power and ground planes in multi-layer PCBs and packages is proposed; it can not only sufficiently eliminate simultaneous switching noise (SSN), but also prevent severe degradation of signal quality in high-speed systems with imperfect reference planes resulting from the perforated structures of uni-planar EBG unit cells. On the assumption that the noise sources and noise-sensitive devices exist only in specific areas, the proposed method partially arranges the EBG unit cells on both the power and ground planes, but only around the critical areas. The SSN suppression performance of the proposed structure is verified by a simulation and measurements.</P>
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Jikwon Kim,Jong-Gwan Yook THE INSTITUTE OF ELECTRICAL ENGINEERS 2014 IEEE Microwave and Wireless Components Letters Vol. No.
<P>In this letter, a novel miniaturization method for 3 dB 90 <SUP>°</SUP> hybrid coupler is proposed. The proposed structure is composed of a conventional structure with a coupled line section inserted in the low impedance section. The proposed coupler occupies an area of only 9.6% compared to a conventional branch-line coupler, and reveals comparable S-parameter characteristics in the operation band. Furthermore, the proposed structure demonstrates a harmonic suppression property due to the a periodicity at odd order harmonics.</P>
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