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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 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
MIMO Antenna Design with Low Correlation for LTE Router
Jo, Ha-Seok ; Zhang, Rui ; Kim, Ji-Hoon ; Kim, Hyung-Hoon ; Kim, Hyeong-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 349~356
DOI : 10.5515/KJKIEES.2015.26.4.349
In this paper, MIMO antenna with low correlation for LTE band 5(824~894 MHz) was designed by adopting monopole antenna and slot antenna. Based on ground characteristic mode theory, MIMO antenna was designed using different types of antennas for enhancement of correlation. MIMO antenna using PIFA and slot type antennas is proposed and correlation coefficient was compared with MIMO antenna using two PIFAs. Average correlation coefficient of MIMO antenna using two PIFAs was 0.71 but the proposed MIMO antenna had very low correlation coefficient of 0.17.
Hexa-Band Hybrid MIMO Antenna for the Mobile Phone Surrounding Ground
Lee, Kyeong-Ho ; Son, Taeho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 357~364
DOI : 10.5515/KJKIEES.2015.26.4.357
In this paper, we designed and implemented a PIFA(Planar Inverted F Antenna) + IFA(Inverted F Antenna) hybrid MIMO(Multi Input Multi Output) antenna for the hexa mobile communication service band. By the simultaneous operation both PIFA and IFA using the coupled feeding structure, we tried for application to modern mobile phones that have large ground size. A PIFA is applied to the ground area, and an IFA is applied to no ground small space on top of the phone. A diagonal fed MIMO antenna is implemented PCB embedded type without antenna carrier component. Implemented antenna on the bare board measured within 3 : 1 for VSWR under hexa mobile communication band as CDMA, GSM900, DCS, KPCS, USPCS, and WCDMA. Measured average gains and efficiencies were -5.19~-3.16 dBi and 30.27~48.26 % for the CDMA, GSM900 band, and -9.50~-5.19 dBi and 11.23~30.28 % for the DCS, KPCS, USPCS, WCDMA band. It`s shown that studied antenna can be applied to the antenna for the modern mobile phone.
Design of a Planar Antenna with Monopole-like Radiation Pattern for On-Body Communications
Kwon, Jaekwang ; Woo, Seungmin ; Tak, Jinpil ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 365~373
DOI : 10.5515/KJKIEES.2015.26.4.365
In this paper, a planar antenna with monopole-like radiation pattern for on-body communications is proposed. The proposed antenna consists of three split-rings(SR) to generate a monopole-like radiation characteristic. To account for the on-body application, the proposed antenna is designed to have a low-profile. The antenna has an overall dimensions of
at 5.8 GHz industrial, scientific, and medical(ISM) band(5.725~5.875 GHz). To verify the body effect, a two-thirds muscle equivalent semi solid phantom is fabricated and used to measure the antenna performance. The 10-dB return loss bandwidth is 280 MHz(5.68~5.96 GHz) and the measured peak gain is 1.91 dBi.
A Study on Channel Access Mechanism of LTE for Coexistence with Wi-Fi on 5 GHz Unlicensed Spectrum
Um, Jungsun ; Yoo, Sungjin ; Park, Seungkwon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 374~380
DOI : 10.5515/KJKIEES.2015.26.4.374
With explosion of wireless traffic it is required to further investigate the technologies on acquiring available spectrum resources and on sharing frequency with existing users. In 3GPP, it is started to study on feasibility and functional requirement of LTE standard in order to extend cellular services offered on only licensed band to 5 GHz unlicensed band. Operating scenario on LTE in unlicensed band is focused on carrier aggregation with licensed band, and the coexistence with Wi-Fi services in 5 GHz band is concerned as a major requirement. For a single global solution framework for licensed assisted access to unlicensed spectrum, listen-before-talk(LBT) mechanism of European regulation for fair access to channel under the coexistence environments is currently examined in 3GPP. In this paper, we evaluate two types of LBT, frame based equipment and load based equipment, with considering LTE carrier aggregation feature and performances of file transferred time and throughput.
A Wireless Video Streaming System for TV White Space Applications
Park, Hyeongyeol ; Ko, Inchang ; Park, Hyungchul ; Shin, Hyunchol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 381~388
DOI : 10.5515/KJKIEES.2015.26.4.381
In this paper, a wireless video streaming system is designed and implemented for TV white space applications. It consists of a RF transceiver module, a digital modem, a camera, and a LCD screen. A VGA resolution video is captured by a camera, modulated by modem, and transmitted by RF transceiver module, and finally displayed at a destination 2.6-inch LCD screen. The RF transceiver is based on direct-conversion architecture. Image leakage is improved by low pass filtering LO, which successfully covers the TVWS. Also, DC offset problem is solved by current steering techniques which control common mode level at DAC output node. The output power of the transmitter and the minimum sensitivity of the receiver is +10 dBm and -82 dBm, respectively. The channel bandwidth is tunable among 6, 7 and 8 MHz according to regulations and standards. Digital modem is realized in Kintex-7 FPGA. Data rate is 9 Mbps based on QPSK and 512ch OFDM. A VGA video is successfully streamed through the air by using the developed TV white-space RF communication module.
Coil Design of Pulse Induction Metal Detector
Jung, Byung-Min ; Chang, Yu-Shin ; Han, Seung-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 389~396
DOI : 10.5515/KJKIEES.2015.26.4.389
A coil design of pulse induction metal detectors has been described. The search coil was demonstrated by using the wire with the diameter of 0.3 mm, 0.5 mm and 1.0 mm and the dielectric plate with the
, the time constant and the currents of the coil as the variation of the coil size and the number of coil turns was characterized. The coil parameters like the resistance, the inductance and the time constants as the variation of the diameter of the wire, the coil size and the number of coil turns were compared and analysed through the calculation and the measurement. In addition, investigating the coil currents as the variation of the input pulse width, the coil design of pulse induction metal detectors has been discussed.
A Method of ISAR Geometric Calibration for Point Target Using Impulse-Radio UWB
Yu, Jiwoong ; Nikitin, Konstantin ; Paek, Inchan ; Jang, Jong Hun ; Ka, Min-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 397~403
DOI : 10.5515/KJKIEES.2015.26.4.397
In this paper, a method of ISAR geometric calibration is represented by using impulse-radio UWB radar. The ir-UWB is good for using a signal processing in time domain, so, it does not occur a multi-path or coupling problem. If a signal that between antennas and target is assumed a plane wave, a center of rotation in ISAR geometry model can be estimated by using point target. Before image is reconstructed with sinogram, the center of rotation can be calculated by using least square fitting. This method can be obtained a more contrast image, and a maximum value of entropy of image. The method, that estimates a center of rotation in received data, will be used a initial setup of instruments or a periodic compensation to reconstruct image. It would be useful in medical, security and surveillance imaging equipments that have a fixed geometry.
Target Classification for Multi-Function Radar Using Kinematics Features
Song, Junho ; Yang, Eunjung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 404~413
DOI : 10.5515/KJKIEES.2015.26.4.404
The target classification for ballistic target(BT) is one of the most critical issues of ballistic defence mode(BDM) in multi-function radar(MFR). Radar responds to the target according to the result of classifying BT and air breathing target(ABT) on BDM. Since the efficiency and accuracy of the classification is closely related to the capacity of the response to the ballistic missile offense, effective and accurate classification scheme is necessary. Generally, JEM(Jet Engine Modulation), HRR(High Range Resolution) and ISAR(Inverse Synthetic Array Radar) image are used for a target classification, which require specific radar waveform, data base and algorithms. In this paper, the classification method that is applicable to a MFR system in a real environment without specific waveform is proposed. The proposed classifier adopts kinematic data as a feature vector to save radar resources at the radar time and hardware point of view and is implemented by fuzzy logic of which simple implementation makes it possible to apply to the real environment. The performance of the proposed method is verified through measured data of the aircraft and simulated data of the ballistic missile.
Array Error Analysis and Correction of Active Array Antenna for AESA Radar
Lee, YuRi ; Kim, JongPil ; Kang, Yeonduk ; Kim, SunJoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 414~423
DOI : 10.5515/KJKIEES.2015.26.4.414
Array error analysis and correction of active array antenna are described in this paper. Array elements composed of radiator and TR(Transmit & Recive) module have error(magnitude and phase difference among array elements) which affects SLL(Side Lobe Level). Error affectedness level depends on ideal SLL according to antenna aperture weighting, number of array elements and antenna effective aperture. To satisfy required SLL, correction of array elements is necessary; adopted differently per errors, and weighted differently per shapes of antenna and required SLL. Errors of every individual element had been defined, performance of the antenna with or without error correction had been estimated and proved through near field test.
Design and Implementation of FPGA Based Real-Time Adaptive Beamformer for AESA Radar Applications
Kim, Dong-Hwan ; Kim, Eun-Hee ; Park, Jong-Heon ; Kim, Seon-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 4, 2015, Pages 424~434
DOI : 10.5515/KJKIEES.2015.26.4.424
Adaptive beamforming algorithms have been widely used to remove interference and jamming in the phased array radar system. Advances in the field programmable gate array(FPGA) technology now make possible the real time processing of adaptive beamforming (ABF) algorithm. In this paper, the FPGA based real-time implementation method of adaptive beamforming system(beamformer) in the pre-processor module for active electronically scanned array(AESA) radar is proposed. A compact FPGA-based adaptive beamformer is developed using commercial off the shelf(COTS) FPGA board with communication via OpenVPX(Virtual Path Cross-connect) backplane. This beamformer comprises a number of high speed complex processing including QR decomposition & back substitution for matrix inversion and complex vector/matrix calculations. The implemented result shows that the adaptive beamforming patterns through FPGA correspond with results of simulation through Matlab. And also confirms the possibility of application in AESA radar due to the real time processing of ABF algorithm through FPGA.