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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of electromagnetic engineering and science
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 9, Issue 4 - Dec 2009
Volume 9, Issue 3 - Sep 2009
Volume 9, Issue 2 - Jun 2009
Volume 9, Issue 1 - Mar 2009
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Characteristics of the Voltages between the Communication Lines and Ground Induced by the Adjacent Artificial High-Voltage or Current ELF Source
Lee, Sang-Mu ; Choi, Mun-Hwan ; Cho, Pyung-Dong ; Eun, Chang-Soo ; Gimm, Yoon-Myoung ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 175~181
DOI : 10.5515/JKIEES.2009.9.4.175
The measurements were performed to verify experimentally that the voltage arising on a telecommunication line by a power line is due to the induction phenomena because there has been an opinion that the arising voltage on a telecommunication line is not by induction, but by other causality. The voltage appeared on the telecommunication line by way of an electric field or magnetic field generated by the source apparatus that had been artificially made to provide intentional constant high-voltage or current in ELF, that is, 60 Hz as an emulated commercial power.
Study on Efficient Frequency Guard Band Decision Rule for Interference Avoidance
Park, Woo-Chul ; Kim, Eun-Cheol ; Kim, Jin-Young ; Kim, Jae-Hyun ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 182~187
DOI : 10.5515/JKIEES.2009.9.4.182
When we assign frequency resources to a new radio service, the existing services need not to be interfered with by the new service. Therefore, when we make a frequency assignment, a guard band is necessary to separate adjacent frequency bands so that both can transmit simultaneously without interfering with each other. In this paper, we propose an efficient frequency guard band decision rule for avoiding interference between radio services. The guard band is established based on the probability of interference in the previously arranged scenario. The interference probability is calculated using the spectrum engineering advanced Monte Carlo(MC) analysis tool(SEAMCAT). After applying the proposed algorithm to set up the frequency guard band, we can decide on the guard band appropriately because the result satisfies the predefined criterion.
A K-Band Low-Power Miniaturized Hyperthermia System
Kim, Dong-Ki ; Kim, Ki-Hyun ; Oh, Jung-Min ; Park, Young-Rak ; Kwon, Young-Woo ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 188~193
DOI : 10.5515/JKIEES.2009.9.4.188
A K-band low-power miniaturized planar-type hyperthermia system was developed to replace massive and expensive equipment. The system consists of a VCO with a buffer amplifier, a high-power amplifier module, a 20-dB-coupled line coupler, a chip circulator and two power detectors for signal generation, amplification and power monitoring. All these components have been implemented in planar form on two module blocks. The total size of the hyperthermia system was less than
. In order to verify the system performance, ablations were carried out on nude mice xenografted with human breast cancer. Ablation results show performance comparable to the massive components-based system. This work shows the feasibility of a low-cost miniaturized hyperthermia system for practical clinical applications.
Performance of Energy Detection Spectrum Sensing with Delay Diversity for Cognitive Radio System
Kim, Eun-Cheol ; Koo, Sung-Wan ; Kim, Jin-Young ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 194~201
DOI : 10.5515/JKIEES.2009.9.4.194
In this paper, a new spectrum sensing method based on energy detection is proposed and analyzed in a cognitive radio(CR) system. We employ a delay diversity receiver for sensing the primary user's spectrum with reasonable cost and complexity. Conventional CR with the receiver equipping multiple antennas requires additional hardware and space for installing multiple antennas in accordance with increase in the number of antennas. If the number of antennas increases, detection probability as well as hardware complexity and cost rise. Then, it is difficult to make a primary user detector practically. Therefore, we adopt a delay diversity receiver for solving problems of the conventional spectrum detector utilizing multiple antennas. We derive analytical expressions for the spectrum sensing performance of the proposed system. From the simulation results, it is demonstrated that the primary user detector with the delay diversity receiver has almost half the complexity and shows similar or improved performance as compared with that employing multiple antennas. Therefore, the proposed spectrum sensing structure can be a practical solution for enhancing the detection capacity in CR system operations. The results of this paper can be applied to legacy CR systems with simple modifications.
Analysis of Interference between UWB and ITS
Park, Se-Ho ; Kim, Eun-Cheol ; Kim, Jin-Young ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 202~210
DOI : 10.5515/JKIEES.2009.9.4.202
In this paper, we have analyzed the effect of interference between ultra-wideband(UWB) and intelligent transport systems(ITS). The maximum possible UWB emission power and minimum possible distance between UWB devices and ITS are found. In order to analyze the interference, we employ the Monte-Carlo(MC) method. We consider six situations, which are indoor office line-of-sight(LOS), indoor office non-line-of-sight(NLOS), indoor residential LOS, indoor residential NLOS, outdoor rural LOS, and outdoor rural NLOS environments. From the simulation results, it is confirmed that coexistence between UWB and ITS devices can be realized in accordance with the emission mask of 19.3 dB for indoor application or 19.3 dB for an image system. And in the outdoors, coexistence between UWB and ITS devices can be realized if the emission mask is at least 1.6 dB for vehicles' radar systems.
A Three-Dimensional Locally One-Dimensional Multiresolution Time-Domain Method Using Daubechies Scaling Function
Ryu, Jae-Jong ; Lee, Wu-Seong ; Kim, Ha-Chul ; Choi, Hyun-Chul ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 211~217
DOI : 10.5515/JKIEES.2009.9.4.211
A three-dimensional locally one-dimensional multiresolution time-domain(LOD-MRTD) method is introduced and unconditional stability is proved analytically. The updating formulations have fewer terms on the right-hand side than those of an alternating direction implicit MRTD(ADI-MRTD). The validation of the method is presented using the resonance frequency problem of an empty cavity. The reduction of the numerical dispersion technique is also combined with the proposed method. The numerical examples show that the combined method can improve the accuracy significantly.
A CPW-Based 77 GHz Power Amplifier with Cascode Structure Using a 130 nm In
Kim, Young-Min ; Koh, Yu-Min ; Park, Young-Rak ; Lee, Si-Young ; Seo, Kwang-Seok ; Kwon, Young-Woo ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 218~222
DOI : 10.5515/JKIEES.2009.9.4.218
In this paper, we present a CPW-based 77 GHz 3-stage power amplifier MMIC for automotive radar systems. The power amplifier MMIC has been realized using a 130 nm
GaAs metamorphic high-electron mobility transistors(mHEMTs) technology and an output stage with a cascode configuration. This produced a good output power and gain performance at 77 GHz. The fabricated power amplifier MMIC exhibited a small-signal gain of 18 dB, an output power of 17 dBm and 9 % power added efficiency(PAE) at 77 GHz with a total gate width of 800
in the output stage. These performances could be useful to low-cost and small-sized components for 77 GHz automotive radar systems.
GA Optimized S-Band Quadrafilar Antenna with the Lowest Back Radiation for a Communication Satellite
Kahng, Sung-Tek ; Kim, Joong-Pyo ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 223~228
DOI : 10.5515/JKIEES.2009.9.4.223
In this paper, a quadrafilar antenna is designed to have a lower profile as an essential part of the size reduction technique and lower back radiation(i.e. higher forward radiation) for the S-band telemetry/telecommand(TM/TC) function of a communication satellite. Particularly, to meet the challenging requirements on the higher isolation between the TM/TC antennas and simultaneously a smaller size, the lowest back radiation and lowest cross-polarization, the optimal physical dimensions of the quadrafilar antenna are found by using the Genetic Algorithm(GA). To prove the validity of the proposed antenna design, its 3D electromagnetic analysis and measured results are compared, showing good agreement.
Line-Source Scattering from Slant Strips
Ock, Jang-Soo ; Eom, Hyo-Joon ;
Journal of electromagnetic engineering and science, volume 9, issue 4, 2009, Pages 229~231
DOI : 10.5515/JKIEES.2009.9.4.229
Electromagnetic scattering from slant strips excited by a line source is investigated. Boundary conditions are applied to obtain simultaneous equations for discrete modal coefficients. Computations are performed to illustrate the effects of line-source scattering on radiation patterns.