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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 13, Issue 4 - Dec 2013
Volume 13, Issue 3 - Sep 2013
Volume 13, Issue 2 - Jun 2013
Volume 13, Issue 1 - Mar 2013
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Isolation Circuits Based on Metamaterial Transmission Lines for Multiplexers(Invited Paper)
Lee, Hanseung ; Itoh, Tatsuo ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 141~150
DOI : 10.5515/JKIEES.2013.13.3.141
Multiplexers based on isolation circuits made of metamaterial lines are proposed and studied. The new approach provides unique advantageous features beneficial to system designer. For instance, there is no need to modify the filters used in multiplexers. Also, the design process is straightforward. In this paper, two types of multiplexers based on metamaterial isolation circuits are presented, and their operation concepts are explained. Also, theories and design process of isolation circuits are presented to help readers design and fabricate proposed multiplexers. For verifying the concepts, two types of triplexers and two types of quadruplexers are designed and fabricated. All filters used in the multiplexers are commercial surface acoustic wave filters. The measured results are well matched with the simulation results.
Target Detection for Marine Radars Using a Data Matrix Bank Filter
Jang, Moon Kwang ; Cho, Choon Sik ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 151~157
DOI : 10.5515/JKIEES.2013.13.3.151
Marine radars are affected by sea and rain clutters, which can make target discrimination difficult. The clutter standard deviation and improvement factor are applied using multiple parameters-moving speed of radar, antenna speed, angle, etc. When a radar signal is processed, a Data Matrix Bank (DMB) filter can be applied to remove sea clutters. This filter allows detection of a target, and since it is not affected by changes in adjacent clutters resulting from a multi- target signal, sea state clutters can be removed. In this paper, we study the level for clutter removal and the method for target detection. In addition, we design a signal processing algorithm for marine radars, analyze the performance of the DMB filter algorithm, and provide a DMB filter algorithm design. We also perform a DMB filter algorithm analysis and simulation, and then apply this to the DMB filter and cell-average constant false alarm rate design to show comparative results.
Extremely Low Numerical Dispersion FDTD Method Based on H(2, 4) Scheme for Lossy Material
Oh, Il-Young ; Hong, Yongjun ; Yook, Jong-Gwan ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 158~164
DOI : 10.5515/JKIEES.2013.13.3.158
This paper expands a previously proposed optimized higher order (2, 4) finite-difference time-domain scheme (H(2, 4) scheme) for use with lossy material. A low dispersion error is obtained by introducing a weighting factor and two scaling factors. The weighting factor creates isotropic dispersion, and the two scaling factors dramatically reduce the numerical dispersion error at an operating frequency. In addition, the results confirm that the proposed scheme performs better than the H(2, 4) scheme for wideband analysis. Lastly, the validity of the proposed scheme is verified by calculating a scattering problem of a lossy circular dielectric cylinder.
Design for High Gain Spiral Antenna by Added Conical Cavity Wall
Jeong, Jae-Hwan ; Min, Kyeong-Sik ; Kim, In-Hwan ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 165~172
DOI : 10.5515/JKIEES.2013.13.3.165
This paper describes a design for a spiral antenna with a conical wall to obtain the high gain. The gain and the axial ratio of the spiral antenna were improved by a new design that included a conical wall and an optimized Archimedean slit on the ground plane in a conventional antenna with a circular cavity wall and a 4.5-turn slit. A gain improvement of 9.5 dBi higher and a good axial ratio of 1.9 dB lower were measured by the added conical wall and the newly designed slit from the current distribution control on the ground plane, respectively. The measured return loss, gain and axial ratio of the proposed antenna showed a good agreement with the simulated results. The proposed antenna will be applied to a non-linear junction detector system.
New Analysis Method for Wireless Power Transfer System with Multiple n Resonators
Kim, Ju-Hui ; Park, Byung-Chul ; Lee, Jeong-Hae ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 173~177
DOI : 10.5515/JKIEES.2013.13.3.173
This paper presents a new method for analyzing the maximum efficiency of a wireless power transfer (WPT) system with multiple n resonators. The method is based on ABCD matrices and allows transformation of the WPT system with multiple n resonators into a single two-port network system. The general maximum efficiency equation of a WPT system with multiple n resonators is derived using the ABCD matrix. Use of this equation allows placement of the relay resonators for maximum efficiency even though they are asymmetrical. The general maximum efficiency equation and the method of the optimum placement are verified by a full wave simulation. The results show that the method is useful for the analysis of a WPT system with relay resonators.
High-Efficiency, High-Gain, Broadband Quasi-Yagi Antenna and Its Array for 60-GHz Wireless Communications
Ta, Son Xuat ; Kang, Sang-Gu ; Han, Jea Jin ; Park, Ikmo ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 178~185
DOI : 10.5515/JKIEES.2013.13.3.178
This paper introduces a high-efficiency, high-gain, broadband quasi-Yagi antenna, and its four-element array for use in 60-GHz wireless communications. The antenna was fed by a microstrip-to-slotline transition consisting of a curved microstripline and a circular slot to allow broadband characteristics. A corrugated ground plane was employed as a reflector to improve the gains in the low-frequency region of the operation bandwidth, and consequently, to reduce variation. The single antenna yielded an impedance bandwidth of 49 to 69 GHz for
<-10dB and a gain of >12.0 dBi while the array exhibited a bandwidth of 52 to 68 GHz and a gain greater than 15.0 dBi. Both proposed designs had small gain variations (
dBi) and high radiation efficiency (>95%) in the 60-GHz bands. The features of the proposed antenna were validated by designing, fabricating, and testing a scaled-up configuration of the single antenna at the 15-GHz band. The measurements resulted in an impedance bandwidth of 13.0 to 17.5 GHz for
<-10dB, a gain of 10.1 to 13.2 dBi, and radiation efficiency in excess of 88% within this bandwidth. Additionally, the 15-GHz antenna yielded quite symmetric radiation profiles in both E- and H-planes, with a high front-to-back ratio.
Real-Time Selection of Pulse Repetition Frequency (PRF) Set for a Triple 2-of-3 PRF Scheme
Kim, Tae-Hyung ; Yi, Jae-Woong ; Byun, Young-Jin ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 186~188
DOI : 10.5515/JKIEES.2013.13.3.186
A triple 2-of-3 pulse repetition frequency (PRF) scheme is presented for medium PRF pulsed-Doppler airborne radars, and a real-time method is developed that searches for optimal or sub-optimal PRF sets according to momentary battle situations. The effectiveness of the real-time search method of PRF sets is demonstrated by the experimental results obtained using simulated data.
Compact Metamaterial-Based Tunable Zeroth-Order Resonant Antenna with Chip Variable Capacitor
Jung, Youn-Kwon ; Lee, Bomson ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 189~191
DOI : 10.5515/JKIEES.2013.13.3.189
This letter presents a compact metamaterial-based tunable zeroth-order resonant antenna. It is based on the double-negative unit cell with a function of tunable inductance realized by a varactor and impedance convertor in the shunt branch. The resonant frequency of the designed antenna ranges from 2.31 to 3.08 GHz, depending on the capacitance of the used varactor. Its size is very compact (
) with a relatively wide tunable range of 29.1%. The impedance bandwidth of the antenna is from 20 to 50 MHz for the resonant center frequency. The measured maximum total realized gain is from -0.68 dBi (2.43 GHz) to 1.69 dBi (2.97 GHz). The EM-simulated and measured results are in good agreement.
A Validation Model for the Statistical Power Balance Method Using a Reverberation Chamber
Lee, Young Seung ; Choi, Sung Woong ; Park, Seung Keun ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 192~194
DOI : 10.5515/JKIEES.2013.13.3.192
This paper proposes a validation model using a reverberation chamber for verification of the effectiveness and accuracy of the statistical power balance (PWB) method. The PWB method treats electromagnetic (EM) field distributions in certain environments as a representative value of an "ensemble" average, so a reverberation chamber is utilized as a testing apparatus to experimentally simulate the sets of measurement field "ensemble" inside a complex environment. Measurements are performed with various test conditions for environmental loss using flat absorbers, and front and side doors of the chamber. Comparison between the PWB analysis and the measurement results shows good agreement, indicating the usefulness of this statistical analysis method for stating the electromagnetic field inside the EM zone as a representative value to general structures.
Metamaterial-Based Zeroth-Order Resonant Antennas for MIMO Applications
Kim, Gunyoung ; Lee, Bomson ;
Journal of electromagnetic engineering and science, volume 13, issue 3, 2013, Pages 195~197
DOI : 10.5515/JKIEES.2013.13.3.195
A compact (
at 2.27 GHz) metamaterial-based zeroth-order resonant antenna system consisting of epsilon-negative (ENG) and mu-negative (MNG) structures is proposed. Although the spacing between the ENG and MNG antennas is only 0.09
, the isolation is relatively high (27.6 dB at 2.27 GHz). Furthermore, the envelope correlation is only 0.015. The radiation efficiencies of the proposed two radiators are also very high (90% on average).