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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Journal of Korean Institute of Electromagnetic Engineering and Science
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Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 25, Issue 12 - Dec 2014
Volume 25, Issue 11 - Nov 2014
Volume 25, Issue 10 - Oct 2014
Volume 25, Issue 9 - Sep 2014
Volume 25, Issue 8 - Aug 2014
Volume 25, Issue 7 - Jul 2014
Volume 25, Issue 6 - Jun 2014
Volume 25, Issue 5 - May 2014
Volume 25, Issue 4 - Apr 2014
Volume 25, Issue 3 - Mar 2014
Volume 25, Issue 2 - Feb 2014
Volume 25, Issue 1 - Jan 2014
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High-Frequency Parameter Extraction of Insulating Transformer Using S-Parameter Measurement
Kim, Sung-Jun ; Ryu, Soo-Jung ; Kim, Tae-Ho ; Kim, Jong-Hyeon ; Nah, Wan-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 259~268
DOI : 10.5515/KJKIEES.2014.25.3.259
In this paper, we suggest a method of extracting circuit parameters of the insulating transformer using S-parameter measurement, especially in high frequency range. At 60 Hz, conventionally, no load test and short circuit test are used to extract the circuit parameters. In this paper S-parameters measured from VNA(Vector Network Analyzer) were used to extract the transformer parameters using data fitting method (optimization). The S-parameters from the equivalent circuit using the extracted parameters showed good agreement with those from measurement. Furthermore, the transformer secondary voltages from the equivalent circuit model also coincide quite exactly to the measured secondary voltages in sinusoidal forms. Finally we assert that the proposed method to extract the parameters for the insulating transformer using S-parameter is valid especially in high frequency.
A Design of a 5 GHz Low Phase Noise Voltage Tuned Dielectric Resonator Oscillator Using Loop Group Delay
Son, Beom-Ik ; Jeong, Hae-Chang ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 269~281
DOI : 10.5515/KJKIEES.2014.25.3.269
In this paper, a systematic design of a low phase noise voltage-tuned dielectric resonator oscillator(VTDRO) using loop group delay is proposed. Designed VTDRO is closed-loop type and consists of a cascade connection of a resonator, phase shifter, and amplifier. Firstly, a reference VTDRO is fabricated and its phase noise and electrical frequency tuning range are measured. Both the phase noise and electrical frequency tuning range depend on the loop group delay. Then, a required value of loop group delay for a new VTDRO with a low phase noise can be systematically computed. In addition, its phase noise and electrical frequency tuning range can be theoretically estimated using those obtained from the measurement of the reference VTDRO. When the loop group delay increases, the phase noise decreases and the electrical frequency tuning range also decreases. The former predominantly depends on the resonator structure. Therefore we propose a systematic design procedure of a resonator with high group delay characteristics. The measured loop group delay of the new VTDRO is about 700 nsec. The measured phase noise of the new VTDRO show a state-of-the-art performance of 154.5 dBc/Hz at 100 kHz frequency offset and electrical frequency tuning range of 448 kHz for a voltage change of 0~10V. The oscillation power is about 4.39 dBm.
A Study on RF Receiver Design and Analysis of Digital Radar Receiver
Lim, Eun-Jae ; Hwang, Hee-Geun ; Rhee, Young-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 282~288
DOI : 10.5515/KJKIEES.2014.25.3.282
In this paper, we have analyzed and designed a digital RF receiver based on the optimization of the dynamic range parameter to secure the wideband characteristics and linearity of digital radar receivers. To improve the wideband characteristics and dynamic range, a low noise amplifier is matching design with a noise source to minimize the noise figure in 1 GHz bandwidth and we improved the linearity of RF-receiver by securing the conversion gain characteristics of receiver through the design of active mixer. RF receiver is designed to give gain 63 dB, noise figure 1.2 dB and dynamic range of RF receiver has 75.8 dB in a wide band of 8.8~9.8 GHz. It is shown to be applicable to X-band digital radar receiver.
0.6~2.0 GHz Wideband Active Balun Using Advanced Phase Correction Architecture
Park, Ji An ; Jin, Ho Jeong ; Cho, Choon Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 289~295
DOI : 10.5515/KJKIEES.2014.25.3.289
In this paper a wideband active balun using advanced phase correction architecture is proposed. The proposed active balun is constructed with each different architecture of active balun combined with the cascode architecture to improve phase correction performance compared with conventional phase correction techniques. Operating over 0.6~2.0 GHz band, the proposed balun shows
of phase error and 2 dB of gain error with 7 mW power consumption from 1.8 V supply voltage.
Measurement Based Visualization Method of Radio Wave Environment Using a Mode Seeking Algorithm
Na, Dong Yeop ; Koo, Hyung Il ; Park, Yong Bae ; Lee, Kyoung Hoon ; Lee, Jae Ki ; Hwang, In Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 296~303
DOI : 10.5515/KJKIEES.2014.25.3.296
In this paper, we propose an algorithm to visualize radio wave environment based on the measured Received Signal Strength Indication( RSSI) and 3D geographic information. We estimate the source position using the circumcenter of the triangle and visualize the radio wave environment using the empirical propagation models. A mode seeking algorithm(mean-shift clustering) is used to seek the peak points and the center of gravity is utilized to reduce the estimation errors. Our approach finds its applications in the radio wave monitoring systems for the efficient utilization of radio resources.
Analysis of Magnetically Coupled Wireless Power Transmission Efficiency according to Material
Oh, TaekKyu ; Lee, Bomson ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 304~310
DOI : 10.5515/KJKIEES.2014.25.3.304
This paper presents the analysis of the coupling coefficient(k), Q value of the resonator, and the optimum loaded resistance at Rx for the magnetically coupled wireless power transmission using two loops(resonators). In addition, the metamaterial, conductor, and the relay methods have been used in order to improve the limitation problem of transmission efficiency by using the figure of merit. We have achieved the increase of transmission efficiency about 11~60 % using the proposed methods by analyzing and comparing the results based on EM simulations.
Specification Establishment and Verification for KSLV-I EMC Control
Ji, Ki-Man ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 311~318
DOI : 10.5515/KJKIEES.2014.25.3.311
Electromagnetic compatibility(EMC) performance of the first Korea space launch vehicle(KSLV-I) should be ensured and verified in order to guarantee the normal operation among the spacecraft, ground facilities which are installed in the space center, and other wireless communication networks. For the purpose of the EMC performance verification, pertinent EMC test specifications, methods, and procedures for both the subsystems and the system should be established in consideration of operational properties and electromagnetic environmental effects. And it is required to maintain and control the EMC properties consistently in accordance with the determined specifications up to the program closing phase. In this paper, sequential management work conducted during the overall development process of the KSLV-I is explained, and not only the phased EMC test plan for each model of the KSLV-I and its subsystem but also test method, specification, and results of the verification tests are presented. And also, multipaction analysis results are presented.
Evaluation of Y-Cap Capacitance in EMI Filter Design Using Measured S-Parameter
Kim, Jonghyeon ; Jeon, Jiwoon ; Kim, Taeho ; Kim, Sungjun ; Nah, Wansoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 319~332
DOI : 10.5515/KJKIEES.2014.25.3.319
Insertion loss is used as the character to express the efficiency of EMI filter. In this paper, we studied the better method that can measure the insertion loss of EMI filter exactly than the original method. For the achievement of this, the method measuring both common mode(CM) and differential mode(DM) insertion loss with arbitrary input/output impedance is accomplished using a 4-ports S-parameters system for consideration of unbalanced factor. Using this method, when input/output used in specific system is known, CM/DM insertion loss of EMI filter inserted in the system can be calculated. Finally, we applied 4-ports modeling method to `X/Y capacitor part` and suggested the algorithm for selecting suitable the value of Y-capacitor using mixed mode S-parameters and mixed mode chain S-parameters.
A Study on the Recent Analysis Method for the RCS Reduction for Naval Ships
Ahn, Byung-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 333~338
DOI : 10.5515/KJKIEES.2014.25.3.333
In this paper, we researched the recent analysis method of RCS prediction for the naval ship and compared the new method with conventional one in respect of the effectiveness to improve a naval ship with low RCS. This paper included the process of analyzing RCS characteristics for naval ship using the numerical method and finding the hotspot by hourglass plot, ISAR image and etc.. Also we introduced the various design methods in order to reduce RCS.
A Broad-Band Metamaterial Absorber Using Flexible Substrate
Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 339~347
DOI : 10.5515/KJKIEES.2014.25.3.339
In this paper, the authors present a new design for a broad-band metamaterial(MTM) absorber that utilizes flexible substrate. The proposed MTM unit cell is constructed by a electric-inducive-capacitive(ELC) resonator and a cut-wire on the same side of the flexible polyimide substrate. To reduce the radar cross section at frequencies other than the targeted frequency bands, the metallic pattern layer of the proposed structure is placed facing toward the incident wave propagation direction. A prototype absorber was fabricated with a planar array of
unit cells. Our experiments showed that the proposed absorber exhibits a peak absorption rate of 92 % and 93 % at 9.06 GHz and 15.0 GHz, respectively, and 75 % of the full-width at half-maximum(FWHM) bandwidth is achieved. The proposed backplane-less MTM structure can be used for a broad-band microwave absorber and irregular surface applications.
Modeling of Effective Path-Length in Satellite Link Based on Rain Cell Statistics
Kang, Woo-Geun ; Kim, Myunghoi ; Kim, In-Kyum ; Choi, Kyung-Soo ; Lee, Byoung-Sun ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 348~356
DOI : 10.5515/KJKIEES.2014.25.3.348
The existing effective path-length model of ITU-R has some drawbacks: The prediction error is quite large compared to domestic measurement data and it is an empirical model in which the physical characteristics of rain cells are not considered. In this paper, a theoretical model for effective path-length using the rain-cell concept was proposed and its validity was verified using the measurement data. To analyze the statistical characteristics of rain cell parameters, the weather-radar data(CAPPI) measured by Korea Meterological Administration were analyzed and the correction factor was properly introduced to fit the Chollian beacon measurement data of ETRI(Electronics and Telecommunications Research Institute). To verify the proposed effective path-length model, it was compared with the Mugunghwa No. 5 beacon data measured in Chungnam National University with the support of ADD(Agency for Defense Development). It was confirmed that the prediction results of the proposed model are in good agreement with the measurement data.
Construction of a CPU Cluster and Implementation of a 3-D Domain Decomposition Parallel FDTD Algorithm
Park, Sungmin ; Chu, Kwang-Uk ; Ju, Saehoon ; Park, Yoon-Mi ; Kim, Ki-Baek ; Jung, Kyung-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 357~364
DOI : 10.5515/KJKIEES.2014.25.3.357
In this work, we construct a CPU cluster to implement a parallel finite-difference time domain(FDTD) algorithm for fast electromagnetic analyses. This parallel FDTD algorithm can reduce the computational time significantly and also analyze electrically larger structures, compared to a single FDTD counterpart. The parallel FDTD algorithm needs communication between neighboring processors, which is performed by the MPI(Message Passing Interface) library and a 3-D domain decomposition is employed to decrease the communication time between neighboring processors. Compared to a single-processor FDTD, the speed up factor of a-CPU-cluster-based parallel FDTD algorithm is investigated for the normal mode and the hypermode and finally analyze an electrically large concrete structure by the developed parallel algorithm.
Interference Influence Analysis on the Interoperability in the Combined Military Communication Systems
Kim, Tae-Woo ; Kim, Jung ; Kwag, Young-Kil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 365~371
DOI : 10.5515/KJKIEES.2014.25.3.365
It is essential for the combined military weapon system to be equipped with interoperability for the efficient combat operation in the modern warfare environment. Since most of modern military systems utilize the electromagnetic wave for the radio communication in the network-centric warfare system, they can be vulnerable to the mutual interference among the adjacent combined military systems. In this paper, the typical radio communication systems are modeled with the modulation types of both spread and non-spread spectrum system. The various interference signals were generated for the simulation of the mutual interference influence from the adjacent radar and communication systems. The simulation results show that the detection performance of the victim communication receiver is seriously affected by the various interferences such as the types of modulation and the ratio of the overlapping bandwidth of the adjacent interferers. This result will be useful for defining the criteria of the interference protection in the combined military system for the interoperability in the future.
Fast Monopulse Method Using Noise-Jamming Subspace
Lim, Jong-Hwan ; Kim, Jae-Hak ; Yang, Hoon-Gee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 372~375
DOI : 10.5515/KJKIEES.2014.25.3.372
A monopulse based on maximum likelihood(ML) in jamming scenario can suppress jamming signal using an inverse matrix of a covariance matrix. In order to achieve adequate suppression of jamming signal, the sufficient number of snapshots is required. However, this is not possible in high PRF scenario, which hinders a real-time tracking. Moreover, even with the large number of snapshots, the estimation accuracy of the target direction is decreased in low JNR(Jammer to Noise Ratio) due to insufficient jammer suppression. In this paper, we propose a monopulse algorithm that doesn`t degrade performance significantly with a small number of snapshots and in low JNR. We show its derivation that exploits noise-jammer subspace of a covariance matrix, along with its performance through simulation.
Design of Dual-Band Power Amplifier for the RFID Frequency-Band
Kim, Jae-Hyun ; Hwang, Sun-Gook ; Park, Hyo-Dal ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 3, 2014, Pages 376~379
DOI : 10.5515/KJKIEES.2014.25.3.376
In this paper, we designed more improving a dual-band power amplifier than the transceiver of RFID reader that operates at 910 MHz and 2.45 GHz. A dual-band power amplifier has two circuits. One matching circuit is composed lumped element in the band of 910 MHz. The other matching circuit using distributed element in the high band of 2.45 GHz. So, this dual-band power amplifier works as Band Rejection Filter in the band of 910 MHz but in the high band of 2.45 GHz works as Band Pass Filter. Therefore, this is composed a microstrip transmission line. A power amplifier is showed gains of 8 dB output power at 910 MHz and 1.5 dB output power at 2.45 GHz. If input power is 10 dBm, both of bands output 20 dBm.