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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
Selecting the target year
Design of UWB MIMO Antenna for On-Body Application
Joo, Eunman ; Kwon, Kyeol ; Jeon, Jaesung ; Kim, Sunwoo ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 137~148
DOI : 10.5515/KJKIEES.2014.25.2.137
In this paper, design of a UWB MIMO antenna for an on-body application is proposed and antenna performance with body effect and the impact on the human body are investigated. The proposed MIMO antenna is composed of UWB antenna above ground plane and an additional plunger shaped isolator located between the two monopole antennas to enhance the isolation characteristic. The simulation and measurement are performed to analyze the effect of the human body on antenna performance when the human body is located in the near field of the antenna. According to the measurement results, the measured SAR values for antennas 1 and 2 are 0.132 W/kg and 0.08 W/kg, respectively when 0.5 mW input power is delivered. These values satisfy the FCC guideline which ragulates that the 1-g average SAR should be lower than 1.6 W/kg.
Complex Mobile Antenna for Wireless Power Transfer & Near Field Communication
Lee, Seok-Moon ; Ha, Cheun-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 149~155
DOI : 10.5515/KJKIEES.2014.25.2.149
In this paper, we study the complex mobile antenna for WPT(Wireless Power Transfer) with NFC(Near Field Communication) of inductive coupling using FPCB which has half thickness compared with the existing coil type antennas. Considering the pattern thickness of loop antenna, the analysis of electromagnetic wave absorber and battery's influence, absorber thickness, the ranges of design parameters are obtained. The proposed antenna has 0.45 mm thickness using single layer 3 oz FPCB and absorber. From measurement, the characteristics of NFC antenna can be satisfied with the specifications of EMVCo. and domestic mobile telecommunication and the transmission efficiency of the proposed WPT antenna is 68.1 % which is competitive with the existing coil type antenna. From the results of this paper, it has been confirmed that the proposed antenna can be used as the WPT and NFC antenna for mobile phone. Key words: Wireless Power Transfer, Near Field Communication, Mobile Phone Antenna, Absorber, FPCB.
-1 Mode Circular Polarization Antenna Design by Using Cross Aperture-Coupled Feed
Kim, Jun-Sik ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 156~163
DOI : 10.5515/KJKIEES.2014.25.2.156
In this paper, a compact circularly polarized metamaterial patch antenna using cross aperture-coupled feed is proposed. The CP antenna utilizes the -1 mode that is induced by the composit right-left handed(CRLH) transmission line. Since the -1 mode has the same properties with the
mode of the conventional patch antenna, the circular polarization(CP) can be realized. If two orthogonal modes are excited with
phase difference, the CP property can be obtained. In order to obtain two orthogonal modes and
phase difference, 4 mushroom structures having the shape of square are employed. The width and length of the cross aperture are optimized through the design algorithm. The fabricated antenna is based on RT/duroid5880 substrate and the total area of the 4 mushroom is
. The center frequency of the LHCP(Left-Handed Circular Polarization) antenna is measured as 1.622 GHz and circular polarization bandwidth(3 dB) is measured as 3 MHz. The center frequency of the RHCP(Right-Handed Circular Polarization) antenna is measured as 1.609 GHz and circular polarization bandwidth (3 dB) is measured as 3 MHz, respectively. The measured radiation efficiency of LHCP antenna is 61.1 % and the measured radiation efficiency of RHCP antenna is 54.5 %.
Satellite Communication Microstrip Antenna for Tx/Rx Dual Operation at X-Band
Kim, Kun-Woo ; Lee, Sung-Jae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 164~171
DOI : 10.5515/KJKIEES.2014.25.2.164
Transmit(Tx)/Receive(Rx) dual band operation microstrip array for X-band satellite communications are designed, fabricated, and measured in this paper. The microstrip array antenna has Right Handed Circular Polarization(RHCP) for Tx band and Left Hand Circular Polarization(LHCP) for Rx band. Two stacked patches are used for wideband characteristics and corner-truncated square patches are adopted for a circular polarization. To enhance bandwidth characteristics of a circular polarization,
sequential rotation array are applied. From the measured result,
microstrip array antennas have a good agreement with those of the simulation. Therefore the array antennas are applicable to military satellite communication antennas.
Design and Fabrication of X-Band GaN TRM for a Radar
Lim, Jae-Hwan ; Jin, Hyung-Suk ; Ryu, Seong-Hyun ; Park, Jong-Sun ; Kim, Tae-Hun ; Lim, Duck-Hee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 172~182
DOI : 10.5515/KJKIEES.2014.25.2.172
In this paper, is is presented the result of design and fabrication for X band T/R module using in active array radar. The high power RF circuit was fabricated using GaN element, so that high power and high efficiency was fulfilled comparing with the previous T/R module that have under 50 W output power for X band. Designed X band T/R module demonstrated 200 W(53 dBm) peak power, 20 us pulse width with 0.4 dB pulse droop and 20 % duty cycle. And it has characteristics of 26 dB receive gain and 4.5 dB noise figure. The structure was applied to prevent serious damage of receive path and GaN HPA by transmitting power during trasmit time of a pulse radar.
Analysis on the Propagated Uncertainty of Output Power of Class-F Power Amplifiers from DC Biasing and Its Optimization
Park, Youngcheol ; Yoon, Hoijin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 183~188
DOI : 10.5515/KJKIEES.2014.25.2.183
In this paper, the propagation effect of power supply uncertainty on the output of class-F power amplifier has been estimated. Also, a 1.9 GHz, 10 watt class-F power amplifier was measured to verify the estimation and to find the optimal biasing point. By approximating the propagation theory of uncertainties, the propagation effect of bias uncertainty was mathmatically calculated. As a result, the DC biases have propagated uncertainties of 15~70 mW. However, at the optimized bias point, the uncertainty in the output power could be dropped less than 15 mW while the output power has dropped by 0.37 dB.
Effective Self-Interference Cancellation for SSD(Simultaneous Single Band Duplex) System
An, Changyoung ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 189~198
DOI : 10.5515/KJKIEES.2014.25.2.189
In this paper, we propose a SSD(Simultaneous Single band Duplex) system using turbo equalizer with frame structure for simultaneous full-duplex communication in single band. the proposed system uses frame structure for self-interference cancellation effectively. In this paper, performance of the proposed system with frame structure compares to performance of SSD system without frame structure to analysis performance of the proposed system with frame structure. Simulation results show that the performance of proposed system with frame structure is batter than performance of SSD system without frame structure when the number of global iterations of both system is same. Using proposed system with frame structure, we can verify that the performance like SSD system without frame structure by few global iteration of turbo equalizer.
HEMP Effect Analysis for Equipment Using Comparison of Norms between HEMP Filter Residual Current and Conducted Susceptibility Criteria
Kwon, Joon-Hyuck ; Song, Ki-Hwan ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 199~207
DOI : 10.5515/KJKIEES.2014.25.2.199
Although High-altitude electromagnetic pulse(HEMP) protection filter meets the requirements of pulsed current injection(PCI) acceptance test, the equipment under test which has low electromagnetic susceptibility level can be damaged during PCI verification test that is performed on operating condition of equipment. This paper proposed the HEMP effect analysis method using comparison of norms between residual current of HEMP filter and transient electromagnetic conducted susceptibility criteria of equipment, as an alternative method under the condition that performing PCI verification test is limited in HEMP hardened facilities. PCI acceptance test of HEMP filter, transient electromagnetic conducted susceptibility test, and PCI verification test are performed and test results are analyzed.
Analysis on Receiving Performance Degradation of Ground Station in Lunar Mission
Park, Durk-Jong ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 208~216
DOI : 10.5515/KJKIEES.2014.25.2.208
Ground station in lunar mission is responsible to receive telemetry signal including sensor data from lunar orbiter and/or lander. At preliminary stage of developing this ground station, receiving performance such as antenna size and noise temperature should be designed on the basis of link budget analysis. When the antenna of ground station is pointing to the moon to communicate with lunar orbiter and/or lander, noise level is supposed to be increasing due to the lunar flux density. It means that the moon is working as a noise source to degrade receiving performance when antenna is pointing to the moon. Antenna noise temperature contributed by the moon was firstly calculated and secondary validated by using test configuration in this paper. Consequently, it was shown that antenna noise temperature caused by the moon was quietly matched with measured one and G/T degradation of receiving system in lunar mission can be calculated depending on antenna size and frequency.
Study on the Beam Pattern Compensation with Planar Active Phased Array Antenna
Chon, Sang-Mi ; Na, Hyung-Ki ; Ahn, Chang-Soo ; Kim, Seon-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 217~222
DOI : 10.5515/KJKIEES.2014.25.2.217
This paper discusses about the beam pattern distortion caused by the failures of some antenna modules in the active array antenna and analyses the possibility of improvement through applying the beam pattern compensation method previously studied. The beam pattern distortion which is mostly represented as an increase of the sidelobe level, can be suppressed through re-synthesizing each module's magnitude and phase. This method was applied to the prototype of active array antenna system, and the results of antenna pattern distortion and compensation were analyzed and measured in the Near Field Chamber. Array failures are generally divided into random TR module failures and TRU(TR Unit: combination of TR modules, Beam Computation module, Power supply module) failures. The results of beam pattern compensation were analyzed in each failure and compared to the results of the simulation. The beam pattern compensation results applied to the real active antenna array system showed the similar to the simulation results. Consequently, it was verified the beam pattern could be compensated with the magnitude and phase adjustment of other normal antenna modules.
Analysis of Channel Characteristics at Around 20 GHz for Satellite On-The-Move Terminal
Kwon, Kun-Sup ; Heo, Jong-Wan ; Hwang, Ki-Min ; Lim, Chul-Min ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 223~234
DOI : 10.5515/KJKIEES.2014.25.2.223
This paper describes the analysis results of channel characteristics in the operating area of satellite OTM(On-The-Move) terminal. The communication channel between the Koreasat-5 and OTM terminal on a test car is measured and recorded from Daejeon to Daecheon, using the downlink frequency of around 20 GHz. And the measurement data are divided into two classes ; highway environment and national road environment, and then are statistically analyzed. The statistical evaluation of satellite channel is conducted by using probability density function and Markov model and then presents average connection duration(ACD), average fade duration( AFD), and level crossing rate(LCR) of highway environment and national road environment. Finally the statistics data of the two environments are compared with each other.
Subarray Channel Calibration and Performance Analysis for Digital Beam-Forming
Jang, Sung-Hoon ; Ahn, Chang-Soo ; Kim, Dong-Hwan ; Kim, Seon-Ju ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 235~244
DOI : 10.5515/KJKIEES.2014.25.2.235
This paper describes the subarray channel configuration and calibration method for airborne AESA radar antenna. AESA radar demonstrator was designed and implemented for the digital beam-forming performance test of the 12 channel subarray structure. Magnitude and phase difference can be exist between the manufactured subarray channel. In this paper, calibration method for the subarray difference error was suggested. We measured digital monopulse slope in the subarray channel and verified the channel calibration effect. To verify the subarray channel operation, digital monopulse channel was compared with analog monopulse channel performance. AESA radar demonstrator was tested in the ground far field test range. Emulated single target was generated to test the detection and tracking performance of the demonstrator with the same waveform and search pattern. We verified that the detection and tracking performance of the 12 subarray digital monopulse channel was similar with the conventional analog monopulse channel. Also, ABF(Adaptive Beam-Forming) function for the sidelobe jammer was tested and effective operation was verified.
ISAR Imaging Using Rear View Radars of an Automobile
Kang, Byung-Soo ; Lee, Hyun-Seok ; Lee, Seung-Jae ; Kang, Min-Suk ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 245~250
DOI : 10.5515/KJKIEES.2014.25.2.245
This paper introduces the inverse synthetic aperture radar(ISAR) imaging technique for rear view target of an automobile, which uses both linear frequency modulation-frequency shift keying(LFM-FSK) waveform and monopulse tracking. LFM-FSK waveform consists of two sequential stepped frequency waveforms with some frequency offset, and thus, can be used to generate ISAR images of rear view target of an automobile. However, ISAR images can often be blurred due to non-uniform change rate of relative aspect angle between radar and target. In order to address this problem, one-dimensional(1-D) Lagrange interpolation technique in conjunction with angle information obtained from the monopulse tracking is applied to generate uniform data across the radar's aspect angle. Simulation results show that the proposed method can provide focused ISAR images.
Frequency Hopping Signal Analysis Using High-Speed Parallel Processing
Lee, Kwang-Yong ; Yoon, Hyun-Chul ; Lee, Hyeon-Hwi ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 251~254
DOI : 10.5515/KJKIEES.2014.25.2.251
In this paper, we studied a technique of extracting a Frequency Hopping(FH) signal for analysis using high-speed parallel processing structure. Unlike fixed frequency signal, FH signal is difficult to detect and analyze because FH systems use many random frequencies instead of a single carrier frequency. To solve this problem we designed a method that analyze FH signal using high-speed parallel processing. In order to apply parallel processing, we use CUDA using GPU and compare single processing with prarallel processing. As a result, using CUDA on a GPU is about 8.53 times faster than single processing.
Imaging Method Using Isorange-IsoDoppler Contours Map in Bistatic Radar
Youn, Jae-Hyuk ; Chung, Yong-Seek ; Chung, Won-Zoo ; Jeong, Myung-Deuk ; Yang, Hoon-Gee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 2, 2014, Pages 255~258
DOI : 10.5515/KJKIEES.2014.25.2.255
Imaging in bistatic radar has been known a more difficult task than that in monostatic radar. It is because the behavior of the bistatic range and the bistatic Doppler due to the motion of a transmitter and a receiver is so random that the compensation procedure, which we call an imaging algorithm, is quite complicated. This paper presents a bistatic radar imaging algorithm that can be used in some specific bistatic radar geometry. We show this geometry can present rectangular-like resolution cell on isorange-isoDoppler contours map. We also present the associated resolution and simulation results.