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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 27, Issue 8 - Sep 2016
Volume 27, Issue 7 - Aug 2016
Volume 27, Issue 6 - Jul 2016
Volume 27, Issue 5 - Jun 2016
Volume 27, Issue 4 - Apr 2016
Volume 27, Issue 3 - Mar 2016
Volume 27, Issue 2 - Feb 2016
Volume 27, Issue 1 - Jan 2016
Selecting the target year
Study on Improvement of the Array Antenna Performance by Isolation Enhancement
Park, Minseo ; Lee, Jae-Gon ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 229~238
DOI : 10.5515/KJKIEES.2016.27.3.229
In this paper, we have studied isolation enhancement using a suppression of surface wave to improve performance of array antenna. To reduce isolation between elements of array antenna, perfect magnetic conductor(PMC) and SOFT-surface is designed and located at center of ground plane, isolation and gain is simulated by commercial full wave simulator(HFSS). As a result, isolation of more than 40 dB and gain improvement of 2.2 dBi are obtained at E-plane array in case of both PMC and SOFT-surface. At H-plane array, air coupling is dominant compared to coupling by surface wave. It is conclude that this study is useful for design of compact array antenna and performance improvement of array antenna.
Method for Eliminating Spurious Signal from Deramped SAR Raw Data
Lim, Byoung-Gyun ; Ryu, Sang-Bum ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 239~245
DOI : 10.5515/KJKIEES.2016.27.3.239
Deramping technique has been widely used to acquire high resolution SAR(Synthetic Aperture Radar) images for the advantage of the data size and the processing time. However, unwanted spurious signals caused by SAR hardware can be leaked in the process of converting into a digital signal through the ADC(Analog-Digital Converter) and added in a echo signal. These tones make image quality degrade significantly. In order to solve this problem, the unwanted tones need to be detected by analysing the characteristic of the noise tone and then effectively removed from raw data. In this paper, we propose a method for efficiently removing noise tone on the raw data based on the characteristic of spurious signals.
Monostatic RCS Measurement for Dielectric Barrier Discharge Plasma
Lee, Hyunjae ; Jung, Inkyun ; Ha, Jungje ; Shin, Woongjae ; Yang, Jin Mo ; Lee, Yongshik ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 246~252
DOI : 10.5515/KJKIEES.2016.27.3.246
In this paper, reduction of monostatic RCS by DBD plasma is measured. For the calibration of monostatic RCS, S-parameters of two metallic plate in different sizes are used and the result is within 0.4 dB error. Metallic plate is put behind DBD plasma generator for measuring reduction of monostatic RCS by DBD plasma. To prevent arc discharge between metallic plate and DBD plasma generator, measurement is progressed spacing the interval between metallic plate and DBD plasma generator. As a result, maximum reduction of monostatic RCS is about 3 dB at 7.4 GHz.
Design of a Planar LPDA Antenna with Light-Weight Supporting Structure for Installing on an Aircraft
Park, Young-Ju ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 253~260
DOI : 10.5515/KJKIEES.2016.27.3.253
This paper proposes a planar Log-Periodic Dipole Array(LPDA) antenna with light-weight supporting structure for installing on an aircraft. The proposed antenna is designed by applying a planar skeleton supporting structure that has light-weight for an aircraft and is capable of withstanding structural vibration. The material of the planar skeleton supporting structure is a Polyether ether ketone(Peek) which has excellent characteristics on strength and temperature. The proposed antenna is fabricated by attaching the radiating elements of the LPDA on both sides of the supporting structure. The changed input impedance due to the dielectric material of the supporting structure was compensated for by controlling the distance and length of several radiating elements. The 10-dB return loss bandwidths of the designed planar LPDA antenna with light-weight supporting structure are obtained as 0.4~3.1 GHz(7.3:1) in the simulation and 0.41~3.5 GHz(8.2:1) in the measurement. The average gains in 0.5~3 GHz band are 6.77 dBi in the simulation and 6.55 dBi in the measurement. Therefore, we confirm that the designed antenna is appropriate to be installed on an aircraft due to its light-weight structure and wideband directional radiation characteristics.
Design of Dual-Polarized Monopulse Cassegrain Antenna for W-Band Millimeter-Wave Seeker
Lee, Kook Joo ; Jung, Chae-Hyun ; Baek, Jong-Gyun ; Park, Chang-Hyun ; Nam, Sangwook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 261~268
DOI : 10.5515/KJKIEES.2016.27.3.261
In this paper, dual-polarized monopulse cassegrain antenna for W-band millimeter-wave seeker was proposed and the performances were verified by the measured results of the fabricated antenna. Dual-polarized monopulse Cassegrain antenna consists of main/subreflector, dual-polarized feed horn and monopulse comparator. The proposed feed horn has
array square waveguide feeding structure to make monopulse signals and it was designed using 90 degree rotational symmetric structure to receive dual-polarized signals. At the sum and difference channel, the measured vertical and horizontal polarization radiation pattern were similar. Measurement gains are 35.1 dBi for v-pol. and 35.6 dBi for h-pol. at the center frequency with 0.5dBi difference between each polarization and the side lobe level is below -21.6 dB.
A 2.65 GHz Doherty Power Amplifier Using Internally-Matched GaN-HEMT
Kang, Hyunuk ; Lee, Hwiseob ; Lim, Wonseob ; Kim, Minseok ; Lee, Hyoungjun ; Yoon, Jeongsang ; Lee, Dongwoo ; Yang, Youngoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 269~276
DOI : 10.5515/KJKIEES.2016.27.3.269
This paper presents a 2.65 GHz Doherty power amplifier with internally-matched GaN HEMT. Internal matching circuits were adopted to match its harmonic impedances inside the package. Simultaneously, due to the partially matched fundamental impedance, input and output matching networks become simpler. Bond wires and parasitic elements of transistor package were predicted by EM simulation. For the LTE signal with 6.5 dB PAPR, the implemented Doherty power amplifier shows a power gain of 13.0 dB, a saturated output power of 55.4 dBm, an efficiency of 49.1 %, and ACLR of -26.3 dBc at 2.65 GHz with an operating voltage of 48 V.
Implementation of Self-Interference Signal Cancelation System in RF/Analog for In-Band Full Duplex
Lee, Jiho ; Chang, Kapseok ; Kim, Youngsik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 277~283
DOI : 10.5515/KJKIEES.2016.27.3.277
In this paper, a system of self-interference signal cancelation for in-band full duplex has been implemented and tested in RF/analog region. The system performance has been evaluated with NI5791 platform and NI Flex RIO. Due to the low power level of the NI5791, the RF signal is amplified by SKYWORKS SE2565T power amplifier. A circulator is used to feed the antenna both the transmitter and receiver. The RF FIR filter is designed by twelve delay taps in two different groups, and the interval between each delay tap is designed to have 100 ps. The amplified signal is distributed to antenna and the FIR filter by use of a 10 dB directional coupler. The tap coefficients of the RF FIR filter are tuned to estimate the self-interference signal coming from antenna reflection and the leakage of the circulator, and the self-interference signal is subtracted. The system is test with 802.11a/g 20 MHz OFMD at 2.56 GHz, and the output power of the amplifier of 0 dBm. The self-interference signal is canceled out by 53 dB.
Electromagnatic Effect Analysis inside Electrically Large Structures Using Topological Modeling and PWB Method
Lee, Jae-Min ; Jung, In-Hwan ; Lee, Jae-Wook ; Lee, Young-Seung ; Kwon, Jong-Hwa ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 284~290
DOI : 10.5515/KJKIEES.2016.27.3.284
As the recently advanced scientific developments result in high lever of the usability and the needs for the electrical equipment and devices in various situations, the safety technologies protecting malfunction and electrical critical damages including soft and hardware from the unexpectedly radiated electromagnetic interferences are required gradually. In addition, the numerical analysis for the miniaturized electrical components and equipments as well as the conventional electrical devices installed inside the electrically large enclosures and structures requires the memory requirement and time consumption too big to be handled in a realistic situation, which will result in a limitation in solving the complete set of maxwell's equations. In this paper, PWB method based on statistical theory and topological modeling with appropriate zoning concepts are introduced for the EM analysis of an electrically large complex structures.
Radiated Emission of Electrical Fast Transient/Burst Signal and Its Countermeasures
Park, Soo Hoon ; Kim, Dong Il ; Park, Youn Joon ; Nah, Seung Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 291~298
DOI : 10.5515/KJKIEES.2016.27.3.291
In this paper, we studied about the radiated emission of EFT(Electrical Fast Transient)/Burst signal, referenced IEC-61000-4-4 of the international EMC standard and its effect on EUT(Equipment Under the Test) when EFT/Burst signal (Conducted noise) induced on a power cable to EUT. Firstly, we set up test sample by the standard and +4 kV standard signal is induced by EFT/Burst signal generator with 1 m length power cable for 1 minute. Consequently, we found not only induced EFT/Burst signal along power line, but also directly radiated emission signal from EFT/Burst signal generator (Radiated emission noise of EFT/Burst). The radiated emission signal of EFT/Burst was 30 dB which is higher than limit of CISPR 22 which is international EMC standard. Moreover, we measured the electric field strength by changing distance from maximum radiated emission point to electric field strength tester. As a result, this electric field strength was 23 V/m which is higher than international EMC standard test level(CISPR 24). Therefore, it was confirmed that the probability of malfunction may be high when radiated emission of EFT/Burst noise exists near the EUT.
Vital Sign Sensor Based on Second Harmonic Frequency Drift of Oscillator
Ku, Ki-Young ; Hong, Yunseog ; Lee, Hee-Jo ; Yun, Gi-Ho ; Yook, Jong-Gwan ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 299~306
DOI : 10.5515/KJKIEES.2016.27.3.299
In this paper, a vital sign sensor based on impedance variation of resonator is proposed to detect the respiration and heartbeat signals within near-field range as a function of the separation distance between resonator and subject. The sensor consists of an oscillator with a built-in planar type patch resonator, a diplexer for only pass the second harmonic frequency, amplifier, SAW filter, and RF detector. The cardiac activity of a subject such as respiration and heartbeat causes the variation of the oscillation frequency corresponding impedance variation of the resonator within near-field range. The combination of the second harmonic oscillation frequency deviation and the superior skirt frequency of the SAW filter enables the proposed sensor to extend twice detection range. The experimental results reveal that the proposed sensor placed 40 mm away from a subject can reliably detect respiration and heartbeat signals.
Take-Over Time Determination for High-Velocity Targets in a Multiple Radar System
Park, Soon-Seo ; Jang, Dae-Sung ; Choi, Han-Lim ; Kim, Eun-Hee ; Sun, Woong ; Lee, Jong-Hyun ; Yoo, Dong-Gil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 307~316
DOI : 10.5515/KJKIEES.2016.27.3.307
A multiple radar system is comprised of early warning radar for fast detection of a target and air defense radar for precision intercept. For this reason, target take-over process is required between the two radars. The target take-over should be performed at an appropriate time by consideration of stable tracking and effective fire control. In this paper, operation characteristics of multiple radar system are analyzed and target take-over time determination method using estimation of target tracking performance is proposed for high-velocity targets. The proposed method is validated with ballistic target defense scenarios in the developed integrated simulator.
Radar Tracking Using Particle Filter for Track-Before-Detect(TBD)
Kwon, Ji-Hoon ; Kang, Seung-Chul ; Kwak, No-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 317~325
DOI : 10.5515/KJKIEES.2016.27.3.317
This paper describes the technique for Radar Particle filter for TBD(Track Before Detect) processing. TBD technique is applied when target is difficult to detect due to low signal-to-noise ratio caused by strong clutter environments, small RCS targets and stealth targets. Particle filter is suitable for a recursive TBD algorithm and has improved estimation accuracy than Kalman filter. In this paper, we will present a new method of calculating particle weight, when observation values(including strong clutter) are received at the same time. Estimation error performance of the particle filter algorithm is analyzed by using the virtual radar observation scenario.
A Development of DDS Based Chirp Signal Generator and X-Band Transmitter-Receiver for Small SAR Sensor
Song, Kyoung-Min ; Lee, Ki-Woong ; Lee, Chang-Hyun ; Lee, Woo-Kyung ; Lee, Myeong-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 326~329
DOI : 10.5515/KJKIEES.2016.27.3.326
UAVs(Unmanned Aerial Vehicle) can be used in variant fields fornot only combat, but also recon, observation and exploration. Moreover, UAVs capacity can be expanded to impossible missions for existing surveillance system such as SAR(Synthetic Aperture Radar) technology that collecting images from all weather conditions. In recent days, with development of highly efficient IC and lightened system technology, there are significant increase of researches and demands to make SAR sensor as a payload of UAV. Therefore, this paper contains development process and results of small signal generator and RF device as a core module of SAR system based on the digital device of DDS.
Design of a W-Band Power Amplifier Using 65 nm CMOS Technology
Kim, Jun-Seong ; Kwon, Oh-yun ; Song, Reem ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 3, 2016, Pages 330~333
DOI : 10.5515/KJKIEES.2016.27.3.330
In this paper, we propose 77 GHz power amplifier for long range automotive collision avoidance radar using 65 nm CMOS process. The proposed circuit has a 3-stage single power amplifier which includes common source structure and transformer. The measurement results show 18.7 dB maximum voltage gain at 13 GHz 3 dB bandwidth. The measured maximum output power is 10.2 dBm, input
is -12 dBm, output
is 5.7 dBm, and maximum power add efficiency is 7.2 %. The power amplifier consumes 140.4 mW DC power from 1.2 V supply voltage.