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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 24, Issue 12 - Dec 2013
Volume 24, Issue 11 - Nov 2013
Volume 24, Issue 10 - Oct 2013
Volume 24, Issue 9 - Sep 2013
Volume 24, Issue 8 - Aug 2013
Volume 24, Issue 7 - Jul 2013
Volume 24, Issue 6 - Jun 2013
Volume 24, Issue 5 - May 2013
Volume 24, Issue 4 - Apr 2013
Volume 24, Issue 3 - Mar 2013
Volume 24, Issue 2 - Feb 2013
Volume 24, Issue 1 - Jan 2013
Selecting the target year
Design and SAR Analysis of Broadband Monopole Antenna Using Loop and T-Shaped Patches
Jang, Ju-Dong ; Lee, Seungwoo ; Kim, Nam ; Choi, Dong-Geun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 1~10
DOI : 10.5515/KJKIEES.2013.24.1.1
In this paper, a broadband planar monopole antenna for multi-band services is proposed. The physical size of the proposed antenna is miniaturized by folding a rectangular loop. And a resonance point in the 3.9 GHz band is reduced by a coupling phenomenon with the central part of the T-shaped patch and the folded rectangular loop. In addition, the T-shaped patch is inserted to the rectangular shaped monopole antenna due to deriving the broadband frequency characteristics. The frequency characteristic is optimized by adjusting the gap and length of the folded rectangular loops and a transverse diameter of the T-shaped patch. The antenna dimensions including the ground plane are
. It is fabricated on the FR-4 substrate(
=4.4) using a microstrip line of
for impedance matching. In the measured result, the bandwidth corresponding to the VSWR of 2:1 is 162 MHz(815~977 MHz) and 2,530 MHz(1.43~3.96 GHz). For analyzing the human effect by the proposed antenna, 1 g and 10 g averaged SARs are simulated and measured. As the simulated results, 1 g-averaged SAR is 1.044 W/kg, and 10 g-averaged SAR is 0.718 W/kg. This result are satisfied by the SAR guidelines which are 1.6 W/kg(1 g-averaged) and 2.0 W/kg(10 g-averaged).
Design and Implementation of Monopole Antenna with Parasitic Element of Spiral Shape and L-Resonator
Yoon, Kwang-Yeol ; Lee, Seungwoo ; Kim, Jang-Yeol ; Rhee, Seung-Yeop ; Kim, Nam ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 11~19
DOI : 10.5515/KJKIEES.2013.24.1.11
In this paper, we designed and implemented the planar monopole antenna using the coupling effect for the multi-band characteristic. A parasitic element for the multi-band characteristic based on a rectangular patch with single resonance is inserted. Spiral shaped parasitic element is used for minimizing the antenna size and obtaining the multi-resonance characteristic. The frequency characteristics are modified and optimized by varying specific parameters. By inserting an L-shaped resonator at both sides of the feed line which connected through the via hole to the ground plane, unnecessary frequency bands are eliminated. Proposed antenna dimension is
. It is fabricated on the FR-4 substrate(
=4.4) using a microstrip line of
for impedance matching. By measurement results, the characteristic of the return loss under -10 dB are 1.714~2.496 GHz, 2.977~4.301 GHz, and 4.721~6.315 GHz, and the radiation patterns have omni-directional shapes.
A Multi-Band Antenna on Automobile-Glass Using Flexible PCB
Kim, In-Bok ; Woo, Dong-Sik ; Kim, Kang Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 20~26
DOI : 10.5515/KJKIEES.2013.24.1.20
In this paper, we propose a multi-band monopole antenna with a band-notching U-slot, which is fabricated inside the flexible polymide film substrate. The U-shaped slot located on the patch-shaped monopole antenna provides band-notch at 2.7 GHz, but also helps to improve return loss at adjacent frequency bands. The performance of the antenna attached on an automobile-glass has been simulated and measured. The fabricated antenna provides more than 10 dB return loss for ISM band(2.4~2.483 GHz) and WAVE band(5.85~5.925 GHz), 2.8~5.7 dBi maximum gain, and good radiation patterns.
Design of Compact and Broadband Quasi-Yagi Antenna Using Balance Analysis of the Balun
Woo, Dong Sik ; Kim, In-Bok ; Kim, Young-Gon ; Kim, Kang Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 27~35
DOI : 10.5515/KJKIEES.2013.24.1.27
In this paper, a compact, broadband quasi-Yagi antenna utilizing balance analysis of the ultra-wideband microstrip-to-coplanar stripline(MS-to-CPS) balun is proposed. The antenna size was reduced by removing the reflector on bottom layer and ground plane is used as a reflector. A planar balun that transforms from microstrip(MS) to balanced coplanar stripline(CPS) is characterized in the amplitude and phase imbalances at CPS output ports are investigated and discussed. As compared with the conventional balun, the proposed MS-to-CPS balun demonstrated very wideband performance from 7 to over 20 GHz. From the simulation study, amplitude and phase imbalances are within 1 dB and
, respectively. The implemented antenna provides very wide bandwidth from 6.9 to 15.1 GHz(74.5 %). The gain of the antenna is from 3.7 to 5.5 dBi, the front-to-back ratio is more than 10 dB, and the nominal radiation efficiency is about 94 %.
Design of Broadband Spiral Antenna for a Portable Non-Linear Junction Detector System
Kim, Jeong-Won ; Min, Kyeong-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 36~46
DOI : 10.5515/KJKIEES.2013.24.1.36
This paper proposes the design of broadband spiral antenna for a potable non-linear junction detector (NLJD) system. To realize the broadband antenna design, it was considered optimization of the number of spiral turns by iteration calculation. Ground plane with the Archimedean spiral slit to keep the same current distribution between radiating plane and ground is considered for circular polarization design. In order to realize high directivity and high gain of the proposed antenna, the cavity wall and the metal cap which is located on back of ground plane were also considered in design. Measurement results of return loss were agreed well with VSWR 2:1 at interested frequency band among 2.4 to 2.44 GHz, 4.84 to 4.92 GHz and 7.28 to 7.36 GHz. Measured axial ratio was observed 3 dB below and showed reasonable agreement with simulation results. Characteristics of the RHCP(Right Hand Circular Polarization) with the measured gain of 6.8 dBi above at interested frequency band were also observed.
A W-Band Millimeter-Wave Power Standard Transfer System Using the Direct Comparison Method
Kwon, Jae-Yong ; Kang, Tae-Weon ; Kang, Jin-Seob ; Lee, Dong-Joon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 47~54
DOI : 10.5515/KJKIEES.2013.24.1.47
This paper introduces a W-band millimeter-wave power standard transfer system using the direct comparison method. The transfer system was developed to evaluate the effective efficiency and calibration factor of a W-band waveguide power sensor. The evaluation method and the measured results of the directional coupler that characterizes the calibration system are studied. The uncertainties of the standard transfer system are investigated, and the major uncertainty contributors are discussed as well. The performance of the realized W-band power standard transfer system was verified by comparing results with reference values.
Phase Tracking Settling Time and BER Performance Evaluation in the Digital Retrodirective Array Antenna System
Kim, So-Ra ; Lee, Seung Hwan ; Shin, Dong Jin ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 55~63
DOI : 10.5515/KJKIEES.2013.24.1.55
Digital retrodirective antenna system is easy to modify and upgrade because it can control the phase information of the output signal toward opposite direction to input signal without a priori knowledge of the arrival direction. Due to this advantage, it is possible to do fast beam tracking. Especially, we need to design the digital PLL performance for the digital retrodirective array antenna system. So, in this paper the settling time of phase estimator and BER performance of retrodirective antenna system are investigated according to design of filter in digital PLL. When QAM signal is used for 1 Mbps with
of phase delay, simulation results show that digital phase conjugation technique has better BER performance by about 1 dB than non-phase conjugation system when digital filter is stable. If not, the system can't estimate the exact phase because of oscillation of filter.
Blind Beamforming Equalization System Based on MUSIC Algorithm
Kim, Yongguk ; Lee, Seung Hwan ; Shin, Dong Jin ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 64~72
DOI : 10.5515/KJKIEES.2013.24.1.64
Blind equalization is a technique that equalizes the received signals without the training sequence. Because of the absence of training sequence, we can increase the bandwidth efficiency due to the blind equalization system. And we must use the blind equalization for removing the ISI in mobile satellite communication receiver. ISI occurs due to mobility of users in mobile satellite communications. Blind equalization is suitable for the mobile satellite communication channels. In this blind equalization, it's very important to improve BER performance to apply the mobile satellite communication system. In this paper, we propose the blind beamforming equalization system using the beamforming, MUSIC algorithm and coordinate change method. We were confirmed by the simulation that the proposed system improves the BER performance.
Coexistence Analysis in Korean RFID/USN Frequency Bands Considering Both PHY and MAC Layers
Yoon, Hyungoo ; Jang, Byung-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 73~81
DOI : 10.5515/KJKIEES.2013.24.1.73
In this paper, we have proposed the interference analysis method which uses both an interference probability model at the PHY layer of RFID system and the DTMC model at the MAC layer of USN system. Using the proposed method, we have performed sharing analysis between passive RFID and USN systems at the Korean RFID/USN frequency bands. If 1% performance degradation of USN system is allowed, RFID and USN systems can share the frequency bands where channel number is greater or equal to 20 on condition that radius of protection area is greater than 300 m.
Study on the High-Frequency Circuit Modeling of the Conducted-Emission from the Motor Drive System of an Electric Vehicle
Jung, Kibum ; Lee, Jongkyung ; Chung, Yeon-Choon ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 82~90
DOI : 10.5515/KJKIEES.2013.24.1.82
In this paper, conducted emission from the MDS(Motor Drive System) of a HEV/EV was analyzed using high- frequency circuit modeling in system-level approach. The conducted emission by PWM process can cause RFI(radio- frequency interference) problems in the AM/FM frequency range. In order to mitigate this conducted emission, a high-frequency equivalent circuit model is proposed by analyzing the fundamental circuits, parasitic components in their parts and connections and non-linear characteristics of IGBTs, high-power capacitors, inverters, motors, high-power cables, and bus bars which are composed of the MDS. It is confirmed that the simulated result by the proposed model is well agreed with measured results in spite of a large-scaled analysis in system level. We are looking forward that this approach can be effectively used in the EMC design of HEV/EV.
Precise Measurement Method and Error Analysis with Roughness Variables for Estimation of Scattering Coefficients
Kweon, Soon-Koo ; Hwang, Ji-Hwan ; Oh, Yisok ; Hong, Sungwook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 91~97
DOI : 10.5515/KJKIEES.2013.24.1.91
The input parameters of scattering models for computing the backscattering coefficients of earth terrains are mainly soil moisture and surface roughness. The backscattering coefficients of soil surfaces are more sensitive to surface roughness than soil moisture. In this study, we propose a precise measurement method for roughness parameters and analyze measurement errors. We measured surface roughness using a pin-board profiler(1 m, 0.5 cm interval) and a laser profiler(1 m, 0.25 cm interval). The measurement differences between two profilers in an average sense are 0.097 cm for root-mean-square (RMS) height and 1.828 cm for correlation length. The analysis of the correlation functions and relative errors shows that the laser measurements are more stable than the pin-board measurements. The differences of the calculated backscattering coefficients using a surface scattering model between pin-board and laser profiler measurements are less than 1 dB.
Effects of Antenna Modeling in 2-D FDTD Simulation of an Ultra-Wide Band Radar for Nondestructive Testing of a Concrete Wall
Joo, Jeong-Myeong ; Hong, Jin-Young ; Shin, Sang-Jin ; Kim, Dong-Hyeon ; Oh, Yisok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 98~105
DOI : 10.5515/KJKIEES.2013.24.1.98
This paper presents a finite-difference time-domain(FDTD) simulation and a data processing technique for radar sensing of the internal structure of a wall using an ultra-wide band antenna. We first designed an ultra-wide band anti-podal vivaldi antenna with a frequency range of 0.3~7 GHz which is chosen to be relatively low after considering the characteristics of wave attenuation, wall penetration, and range resolution. In this study the two-dimensional FDTD technique was used to simulate a wall-penetration-radar experiment under practical conditions. The next, the measured radiation pattern of the practical antenna is considered as an equivalent source in the FDTD simulation, and the reflection data of a concrete wall and targets are obtained by using the simulation. Then, a data processing technique has been applied to the FDTD reflection data to get a radar image for remote sensing of the internal structure of the wall. We compared the two different source excitations in the FDTD simulation; (1) commonly-used isotropic point sources and (2) polynomial curve fitting sources of the measured radiation pattern. As a result, when we apply the measured antenna pattern into the FDTD simulation, we could obtain about 2.5 dB higher signal to noise level than using a plane wave incidence with isotropic sources.
Analysis of Human Exposure for Wireless Devices Near War-Fighter
Seo, Min-Gyeong ; Choi, Jeung-Won ; Ko, Jong Hwan ; Lee, Hyunsung ; Park, Juman ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 1, 2013, Pages 106~112
DOI : 10.5515/KJKIEES.2013.24.1.106
In this paper, human exposure of wireless devices was analyzed for various positions of the transmitter. The scenario for the position of the transmitting antenna was decided after discussion with ADD(Agency for Defense Development), and Korean male phantom model developed by ETRI were used to conduct simulations. The SAR values were analyzed by changing the position of the transmitter, and compared with Korean EMF regulations and ICNIRP guidelines. Additionally, human exposure was also investigated for two typical postures which can be posed by war-fighter.