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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
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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
Researches on Microstrip Reflectarray Antennas
Yoon, Young Joong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 937~950
DOI : 10.5515/KJKIEES.2015.26.11.937
Microstrip reflectarray is an antenna which controls its radiation pattern with a number of reflective elements. Conventionally, the reflectarray has been researched to replace curved reflector antennas. In this paper, design theories of reflectarray is briefly introduced, and research trends of high gain and broadband reflectarrays are reviewed. To improve the gain of the reflectarrays, it is required that the reflection phase errors on the reflectarray surface be minimized. For this purpose, sufficiently wide reflection phase range and low phase sensitivity should be realized with the designed element. For bandwidth improvement, the reflection phase of the element should be linear with the frequency variation. In this paper, various researches to improve the reflection phase characteristics of the element for high gain and broadband reflectarrays, such as multi-layer and single-layer multi-resonant structures, are reviewed. Also, dual-reflectarray configuration for compact antenna design is reviewed. Finally, various applications of reflectarrays such as contoured beam, near-field focusing, and RCS reduction are reviewed.
Introduction to Ground Radiation Antenna for Mobile Devices
Kim, Jihoon ; Moon, Sungjin ; Kim, Hyeongdong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 951~959
DOI : 10.5515/KJKIEES.2015.26.11.951
Ground radiation antenna in mobile devices is becoming an issue for satisfying both miniaturization and high performance. Ground radiation antenna controls the characteristic mode of the ground plane and couples this mode with the ground radiation antenna, thereby having good radiation performance. In this paper, the characteristic mode theory and applications of ground radiation antenna will be introduced. The operating mechanism of single band, wideband and dual-band ground radiation antennas are studied.
Coupled-Line Directional Coupler Using Artificial Transmission Line
Sim, Kyung-Sub ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 960~965
DOI : 10.5515/KJKIEES.2015.26.11.960
In this paper, a coupled line directional coupler using an LUC(Low-pass filter Unit Cell) of artificial transmission line is presented. The conventional coupled line coupler is limited in length by the
transmission line while the proposed coupling structure is implemented smaller than
by inserting the phase delay line between two coupled line, reduced in physical size by configuring a phase delay line with an LUC having the characteristics of a typical transmission line in a particular frequency. A coupler having -10 dB coupling factor at the center frequency of 700 MHz is designed, fabricated. The measured result agrees well with that of conventional one. The length of the fabricated coupled line coupler has about 45 % in length compared to the conventional one.
Compact Cascaded Quadruplet Bandpass Filter Using Modified Coaxial Cavity Resonator with Q-Factor Improvement
Jang, Geon-Ho ; Wang, Xu-Guang ; Lee, Bo-Ram ; Park, Nam-Shin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 966~977
DOI : 10.5515/KJKIEES.2015.26.11.966
This paper presents a novel modified coaxial cavity resonator and its application to bandpass filters with compact size and improved quality factor(Q-factor). The proposed resonator is made up of
or curved four inner conductive posts within a single cavity, which provides quadruplet to realize bandpass filter. No metallic walls inside the cavity are required, and thus the utilization efficiency of the cavity space is improved. As a result, the unloaded Q can be approximately 15 % higher in comparison to the conventional coaxial resonator, or more than 35 % volume saving can be achieved while maintaining the similar Q-factor value with the conventional designs. In addition, due to the multiple cross-coupling occurring within the cavity, including the source-to-load coupling, four flexible transmission zeros can be created to realize different filtering functions. Simulations as well as experimental results of four- and eight-pole filters are presented to validate this attractive design concept. Good agreement between measured and computed results is obtained.
Transceiver Design for Terminal Operating with Common Data Link on Ku-Band
Jeong, Byeoung-Koo ; Seo, Jung-Won ; Ryu, Ji-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 978~984
DOI : 10.5515/KJKIEES.2015.26.11.978
In this paper, we designed a RF transceiver operating up to 200 km operating range and 45 Mbps data rate. The RF transceiver operates in Ku band and composed of up/down converter, high power amplifier, front-end elements. To satisfy the operating range of RF transceiver, 10W power amplifier was required and realized by using GaN power amplifier. Moreover, to mitigate mutual interference for different bandwidth signals due to the adaptive transmission speed control function, SAW filter bank structure was used. To verify system requirement satisfaction AWR simulation tool was used.
Analysis of Spatial Distributions of Rainfall Rate for Satellite Site Diversity in Korea
Kwon, Yong-Ki ; Park, Jung-Kyu ; Yoon, Dae-Whan ; Nho, Hyunjun ; Park, Sungchun ; Lee, Whangjae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 985~991
DOI : 10.5515/KJKIEES.2015.26.11.985
This paper proposes appropriate locations for site diversity to provide stable satellite communication service in Korea. For this purpose, we analyzed rainfall rate data measured by KMA for 5 years at 88 sites, and the variations of simultaneous occurrence of rainfall rate in pairs of sites using the correlation coefficient. This paper provided contour maps of the spatial ditstribution of rainfall rate correlation, and proposed information on the optimum sites/regions for the operation of muti-uplink satellite systems, in 4 cities which were principal in field of satellite communication in Korea.
The CE101 Test of the Army Aircraft's UHF Band Transceiver
Seo, Jung-Won ; Jung, Byoung-Koo ; Yoon, Chang-Bae ; Shin, Young-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 992~998
DOI : 10.5515/KJKIEES.2015.26.11.992
In case of UHF Band Transceiver for Army Aircraft, it shall follow MIL-STD-461F Figure CE101-4 most key design points for this equipment were to minize the current consumption and frequency interference since it will be integrated on aircraft. However, after design, abnomal signal(over 100 dBuA) was occured from 30 Hz to 1 kHz on CE101 test. Occured abnomal signal was measured as 50 Hz signal which was tansceiver
signal with the output power of 10 W and 20 ms periods. To meet the specification, current variation needed to be minized. Thus,
of power amplifier were modified almost equally through test result and finally, the equipment was designed and developed with no difference of current consumption and frequency interference from the previous design goal.
The Low Probability of Intercept RADAR Waveform Based on Random Phase and Code Rate Transition for Doppler Tolerance Improvement
Lee, Ki-Woong ; Lee, Woo-Kyung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 999~1011
DOI : 10.5515/KJKIEES.2015.26.11.999
In modern electronic warfare, RADAR is under constant threat of ECM(Electronic Counter Measures) signals from nearby jammers. The conventional linear frequency modulated(Linear-FM) waveform is easy to be intercepted to estimate its signal parameters due to its periodical phase transition. Recently, APCN(Advanced Pulse Compression Noise) waveform using random amplitude and phase transition was proposed for LPI(Low probability of Intercept). But random phase code signals such as APCN waveform tend to be sensitive to Doppler frequency shift and result in performance degradation during moving target detection. In this paper, random phase and code rate transition based radar waveform(RPCR) is proposed for Doppler tolerance improvement. Time frequency analysis is carried out through ambiguity analysis to validate the improved Doppler tolerance of RPCR waveform. As a means to measure the vulnerability of the proposed RPCR waveform against LPI, WHT(Wigner-Hough Transform) is adopted to analyze and estimate signal parameters for ECCM(Electronic Counter Counter Measures) application.
Acceleration of the Iterative Physical Optics Using Graphic Processing Unit
Lee, Yong-Hee ; Chin, Huicheol ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 1012~1019
DOI : 10.5515/KJKIEES.2015.26.11.1012
This paper shows the acceleration of iterative physical optics(IPO) for radar cross section(RCS) by using two techniques effectively. For the analysis of the multiple reflection in the cavity, IPO uses the near field method, unlike shooting and bouncing rays method which uses the geometric optics(GO). However, it is still far slower than physical optics(PO) and it is needed to accelerate the speed of IPO for practical purpose. In order to address this problem, graphic processing unit(GPU) can be applied to reduce calculation time and adaptive iterative physical optics-change rate(AIPO-CR) method is also applicable effectively to optimize iteration for acceleration of calculation.
Waveguide Broad-Wall Slot Array Monopulse Antenna for Millimeter-Wave Seeker Using Dip Brazing Method
Baek, Jong-Gyun ; Jung, Chae-Hyun ; Lee, Kook-Joo ; Park, Chang-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 1020~1026
DOI : 10.5515/KJKIEES.2015.26.11.1020
In this paper, the design of longitudinal shunt slot array monopulse antenna in the broad wall of waveguide for Ka band millimeter-wave seeker, Dip-Brazing method for fabrication and experiment results are presented. The proposed antenna consists of radiating slots by using Elliot's array synthesis procedure, probe-exciting feed structure for improving the return loss bandwidth and monopulse comparator. Element weigthings in the array have been calculated by continuous Taylor aperture distribution. Also, the simulation tool has been used to characterize the individual isolated slot, which has subsequently been used in Elliot's method to design the slot array efficiently. The designed antenna is fabricated using Dip-Brazing method. The gain of measured antenna is 28.4 dBi. Antenna beamwidth and side lobe levels are similar to the design result we expect.
Sidelobe Reduction Method for Improvement of Airborne SAR Image
Shin, Hee-Sub ; Ok, Jae-Woo ; Woo, Jae-Choon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 11, 2015, Pages 1027~1030
DOI : 10.5515/KJKIEES.2015.26.11.1027
In the airborne SAR, the motion errors induced by atmospheric turbulence decrease the resolution and increase the sidelobes. If the sidelobes are not properly compensated, the image quality is degraded. Thus, in this paper, we have introduced the sidelobe reduction method to increase the image quality. After we calculate the scene center based on the estimated squint angle for the flight path partitioned by the subaperture technique, we perform the motion compensation for the scene center. Then, after we perform the recursive sidelobe reduction for the region of interest in the reconstructed SAR image, we extend it for the full image.