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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
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
Editor in Chief :
Volume & Issues
Volume 26, Issue 12 - Dec 2015
Volume 26, Issue 11 - Nov 2015
Volume 26, Issue 10 - Oct 2015
Volume 26, Issue 9 - Sep 2015
Volume 26, Issue 8 - Aug 2015
Volume 26, Issue 7 - Jul 2015
Volume 26, Issue 6 - Jun 2015
Volume 26, Issue 5 - May 2015
Volume 26, Issue 4 - Apr 2015
Volume 26, Issue 3 - Mar 2015
Volume 26, Issue 2 - Feb 2015
Volume 26, Issue 1 - Jan 2015
Selecting the target year
Electromagnetic Wave Absorbers with Metamaterial Structure for RCS Reduction
Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 1~15
DOI : 10.5515/KJKIEES.2015.26.1.1
In this invited paper, the authors give an overview of the new design technology for a metallic backplane-less metamaterial(MM) absorber and discuss a selection of examples. In contrast to a common MM absorber structure, the metallic pattern layer of the presented structure is placed facing toward the incident wave propagation direction to reduce the radar cross section(RCS) due to the metallic pattern itself at frequencies other than the targeted absorption frequency bands. The ability of the MM backplane-less absorber to exhibit broadband absorption performance and irregular surface applications will be discussed.
Band Type Wearable Device's RF Configuration and Bent Microstrip Patch Antenna
Lee, Dongho ; Choi, Woo Cheol ; Kim, Sung Hoe ; Yoon, Young Joong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 16~23
DOI : 10.5515/KJKIEES.2015.26.1.16
In this paper, a bent microstrip patch antenna, which is suitable for band-type wearable devices and RF configuration, to be used in the WCDMA2100 mobile network is proposed. The proposed antenna using RF configuration which is consisted of separated Tx and Rx frequency band is designed to operate or function in WCDMA2100 Tx frequency band only and it is not strongly affected by the human body because of the conductor at the bottom side. At both flat case and bent case, the proposed antenna's maximum gain satisfies at least 5.3 dBi, and its -6 dB return loss bandwidth is wider than 20 MHz. The simulated surface absorption rate(
) result is under 0.7 [W/kg]. The proposed antenna suits in band-type wearable devices which is worn on wrists or arms.
Isolation Improvement of a Broadband Antenna Using a High-Permeability Substrate
Hur, Jun ; Kay, Youngchul ; Choo, Hosung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 24~29
DOI : 10.5515/KJKIEES.2015.26.1.24
In this paper, we propose a method of isolation improvement for broadband antennas using a high-permeability substrate. The substrate is applied for a planar monopole antenna based on near-field analysis to maintain radiation characteristics at its operating frequency while improving isolation by minimizing mutual coupling with nearby antennas at other frequency bands. To verify isolation improvement, we compare performance variations of
according to the existence of the substrate using the proposed antenna and a reference antenna whose operating frequency is 2 GHz. As a result, the radiation characteristics are maintained, and
performance is improved by more than 5~10 dB in the frequency band of greater than 2 GHz, which demonstrates the isolation can be improved by using the high-permeability substrate.
Compact Triple-Mode Bandpass Filter Using a Cylindrical Dielectric Resonator
Jang, Geon-Ho ; Park, Nam-Shin ; Kim, Byung-Chul ; Lee, Don-Yong ; Won, Jung-Hee ; Wang, Xu-Guang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 30~38
DOI : 10.5515/KJKIEES.2015.26.1.30
In this paper, the design of a compact triple-mode bandpass filter using a high-Q cylindrical dielectric resonator is proposed. In detail, the triple
modes along three orthogonal axes are used and novel coupling structure in the metallic enclosure is adopted to introduce the coupling between the resonant modes. Due to the cross coupling, the proposed bandpass filter has an asymmetric frequency response with flexible three transmission zeros, one of which can be located very close to the passband edge to provide an extremely sharp skirt characteristic with low insertion loss. The proposed filter is about 60 % miniaturized compared with conventional single-mode dielectric resonator filter. The proposed bandpass filter design is validated by the circuit and 3D EM simulations and measurements compared to the target specifications.
RF Gas Sensor Using 4-Port Hybrid Coupler with Conducting Polymer
Lee, Yong-Joo ; Kim, Byung-Hyun ; Lee, Hee-Jo ; Hong, Yunseog ; Lee, Seung Hwan ; Choi, Hyang Hee ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 39~46
DOI : 10.5515/KJKIEES.2015.26.1.39
In this paper, a gas sensor using a modified
hybrid coupler structure with conducting polymer which operates at 2.4 GHz is represented. Conducting polymers are used to the gas sensing material in proposed sensors. The conducting polymer varies its electrical property, such as work function and conductivity corresponding to the certain gas. To verify this variation of electrical property of conducting polymer at microwave frequencies, the conducting polymer is incorporated with the
hybrid coupler structure, and this proposed sensor operates as reflection type variable attenuator and variable phase shifter. The conducting polymer is employed as impedence-variable transmission lines that cause a impedance mismatching between the general transmission line and conducting polymer. The experiment was conducted with 100 ppm ethanol gas at temperature of
and relative humidity of 85 %. As a result, the amplitude deviation of
is 0.13 dB and the frequency satisfying
is shifted about 2.875 MHz.
Fluidically-Controlled Phase Tunable Line Using Inkjet-Printed Microfluidic Composite Right/Left Handed Transmission Line
Choi, Sungjin ; Lim, Sungjoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 47~53
DOI : 10.5515/KJKIEES.2015.26.1.47
In this paper, a novel fluid controlled phase tunable line using inkjet printed microfluidic composite right/left-handed(CRLH) transmission line(TL) is proposed. A CRLH-TL prototype has been inkjet-printed on a paper substrate using silver nano particle ink. In addition, a laser-etched microfluidic channel in poly methyl methacrylate(PMMA) has been integrated with the CRLH TL using inkjet-printed SU-8 as a bonding material. The proposed TL provides excellent phase-tuning capability that is dependent on the different fluidic materials used. As the fluid is changed, the proposed TL can have negative-phase, zero-phase, and positive-phase characteristics at 900 MHz and reflection coefficient is maintained to below -10 dB. The performance of the proposed TL is successfully validated using simulation and measurement results.
Design and Implementation of Mobile Electronically Scanned TACAN Antenna
Park, Sang Jin ; Koo, Kyung Heon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 54~62
DOI : 10.5515/KJKIEES.2015.26.1.54
This paper describes the design and fabrication of an electronically rotated Tactical Air Navigation(TACAN) antenna using parasitic elements and PIN diode switches. We used parasitic elements arranged in a circular array and PIN diode switches to electronically rotate the antenna instead of employing a mechanically rotated antenna using motor. The antenna's physical characteristics and design features to generate the cardioid pattern and nine-lobe pattern including bearing information are described and simulated. The measured result shows a very good agreement with simulation and meets the specification of MIL-STD-291C.
A 900 MHz RFID Receiver with an Integrated Digital Data Slicer
Cho, Younga ; Kim, Dong-Hyun ; Kim, Namhyung ; Rieh, Jae-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 63~70
DOI : 10.5515/KJKIEES.2015.26.1.63
In this paper, a receiver has been developed in a
CMOS technology for 900 MHz RFID communication system applications. The receiver is composed of an envelope detector, a low-pass-filter, a comparator, D flip-flops, as well as an oscillator to provide the clock for digital blocks. The receiver is designed for low power consumption, which would be suitable for passive RFID tags. In this circuit, a digital data slicer was employed instead of the conventional analog data slicer in order to reduce the power consumption. The clock frequency is 1.68 MHz and the circuit operates with a power consumption as small as
. The chip size is
excluding the probing pads.
Stability and PSR(Power-Supply Rejection) Models for Design Optimization of Capacitor-less LDO Regulators
Joo, Soyeon ; Kim, Jintae ; Kim, SoYoung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 71~80
DOI : 10.5515/KJKIEES.2015.26.1.71
LDO(Low Drop-Out) regulators have become an essential building block in modern PMIC(Power Managment IC) to extend battery life of electronic devices. In this paper, we optimize capacitor-less LDO regulator via Geometric Programming(GP) designed using Dongbu HiTek
BCDMOS process. GP-compatible models for stability and PSR of LDO regulators are derived based on monomial formulation of transistor characteristics. Average errors between simulation and the proposed model are 9.3 % and 13.1 %, for phase margin and PSR, respectively. Based on the proposed models, the capacitor-less LDO optimization can be performed by changing the PSR constraint of the design. The GP-compatible performance models developed in this work enables the design automation of capacitor-less LDO regulator for different design target specification.
An Implementation of Interferometric Radar Altimeter Simulator
Paek, Inchan ; Lee, Sangil ; Yoo, Kyungju ; Jang, Jong Hun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 81~87
DOI : 10.5515/KJKIEES.2015.26.1.81
We present an implementation result of a computer GUI-based simulator using MATLAB to verify the performance of interferometric radar altimeter(IRA) which is possible to measure the slant range altitude and the cross-track angle to the nearest point for terrain aided navigation(TAN). After a brief description of the principle of TAN and IRA, we present that the grids are divided for the modeling of the reflected signal in digital elevation map(DEM) and so the radar cross section(RCS) of each grid is calculated and the signal-noise ratio(SNR) of the reflected signal in the radar beam width. And the signal processing procedures of the IRA and the structure of the IRA simulator are shown.
Comparison of Accuracy of Interpolation Methods for Scattered Field of Large Objects: Sinc and VSH(Vector Spherical Harmonics) Functions
Jung, Ki Hwan ; Choi, Seung Ho ; Koh, Il Suek ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 88~93
DOI : 10.5515/KJKIEES.2015.26.1.88
To estimate RCS(Radar Cross Section) at arbitrary incident angles for large objects, an interpolation method is required based on the pre-calculated RCS database at finite discrete sampling points. It is numerically difficult to compute the RCS by a large object at all required sampling points, since the computation time may be very long for one sampling point and many sampling points are required to satisfy the exact sampling condition. Therefore, it may be required to accurately estimate the RCS at any incident angles based on a database whose size is as small as possible. In this paper, the accuracy of two interpolation methods base on the sinc-and VSH(Vector Spherical Harmonics) functions are numerically compared.
Verification on the Calculated Geoelectric Field on Power Grid during Geomagnetic Disturbances
Park, Sung Won ; Yoo, Chung-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 94~100
DOI : 10.5515/KJKIEES.2015.26.1.94
Coronal mass ejection (CME) released due to solar flare explosion cause geomagnetic disturbance. The induced current by massive geomagnetic disturbance can cause damage to the transformer. The calculated geoelectric field is a major parameter of the geomagnetically induced current (GIC). The method applying a Fourier transform has a high accuracy but it needs all data measured for 24 hours. And the other method applying a integral equation can calculate in real time but it requires to check an accuracy. To reduce the gap between the calculated results of two methods, it adjusts the integration section. As a result, the correlation between two calculated geoelectric fields is high, and the event time and direction of the calculated current is the same as that of the measured current, and it's accuracy rate is above 92 percent.
Spectroscopic Characterization of 400℃ Annealed Zn
S Thin Films
Kang, Kwang-Yong ; Lee, Seung-Hwan ; Lee, Nam-Kwon ; Lee, Jeong-Ju ; Yu, Yun-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 101~112
DOI : 10.5515/KJKIEES.2015.26.1.101
II~VI compound semiconductors,
thin films have been synthesized onto indium-tin-oxide(ITO) coated glass substrates using thermal evaporation technique. The composition ratio x(
) was varied to fabricate different kinds of
thin films including CdS(x=0) and ZnS(x=1) thin films. Then, the deposited thin films were thermally annealed at
to enhance their crystallinity. The chemical composition and electronic structure of films were investigated by using X-ray photoelectron spectroscopy(XPS). The optical energy gaps of the samples were determined by ultra violet-visible-near infrared(UV-Vis-NIR) spectroscopy and were found to vary in the range of 2.44 to 3.98 eV when x changes from 0 to 1. Finally, we measured the THz characteristics of the
thin films using THz-TDS(time domain spectroscopy) system to identify the capability for electronic and optical devices in THz region.
A Retro-Directive Array System for Reduction of Electromagnetic Wave Reflection
Ha, Jungje ; Jang, Sunghoon ; Lee, Yongshik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 1, 2015, Pages 113~118
DOI : 10.5515/KJKIEES.2015.26.1.113
In this paper, a cancellation technique for electromagnetic waves is realized based on a retrodirective antenna array system. The system re-transmits a signal to the direction of the incoming signal, with the same frequency and opposite phase. For the experimental verification, a
retrodirective array system is designed and fabricated. Experimental results for a metallic cylinder show as much as 26-dB reduction in reflection.