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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 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 Analysis of 45°-Inclined Linearly Polarized Substrate Integrated Waveguide(SIW) Slot Sub-Array Antenna for 35 GHz
Kim, Dong-Yeon ; Nam, Sangwook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 357~365
DOI : 10.5515/KJKIEES.2013.24.4.365
The 4 by 4 series slot sub-array antenna is proposed using substrate integrated waveguide(SIW) technology for 35 GHz of Ka band application. The proposed antenna is realized with multi-layered structure for compact size and easy integration features. 4 by 4 radiating slots are arrayed on top PCB with equal spacing and the feeding SIWs are arranged on middle and bottom PCBs for uniform power distribution. The multi-layered antenna is realized using RT/Duroid 5880 that has dielectric constant of 2.2 and the total antenna size is
. The individual parts such as radiators and feeding networks are simulated using full-wave simulator CST MWS. Furthermore, the total sub-array antenna also fabricated and measured the electrical performances such as impedance bandwidth under the criteria of -10 dB(490 MHz), maximum gain(18.02 dBi), sidelobe level(SLL)(-11.0 dB), and cross polarization discrimination (XPD)(-20.16 dB).
A Study of the RCS Reduction by Pattern Synthesis for Singly Curved Structures
Kim, Woojoong ; Seo, Hyeong Pil ; Kim, Youngsub ; Yoon, Young Joong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 366~373
DOI : 10.5515/KJKIEES.2013.24.4.366
This paper discusses the singly curved phased reflector for reduced RCS pattern, which has minimized RCS level at boresight with a null by phase cancelation and the lowered RCS level of main beam by splitting the main beam into multi directions. Considering the reduced level of boresight and main beam compared to the same sized reference PEC, this proposed multi-beam reflector can be adopted in the mono-static radar and the bi-static radar environment. The proposed reflector is a multi-beam reflector, which has different phase distributions at each row for different steering angle. It is designed through an intermediate stage of a single and dual-beam reflector. The behaviors of the designed reflectors are verified through full-wave simulation and experiment. The reflectors are designed in the frequency of 10 GHz and it has a size
) with the curvature k=3.3. From the measured results, the proposed reflectors reduce the reflected power by 17 dB at boresight.
A Study on Isolation Improvement of LTE-PIFA Used Stub Structure on Ground Plane
Park, Chan-Jin ; Min, Kyoeng-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 374~383
DOI : 10.5515/KJKIEES.2013.24.4.374
This paper presents a design for improvement of isolation characteristics by the inserted stub structure on ground plane of a handy terminal which is composed of a main antenna and a sub antenna covered LTE bandwidth. In order to compensate for a resonance length of proposed antenna and to realize a high isolation characteristic, a pair of stub was inserted and located on ground plane that currents from two antennas were converged. A simulated isolation characteristic of antenna without stub at the LTE class 13 band was about -5 dB, but its characteristics of proposed antenna with two stubs at uplink(777~787 MHz) and downlink(746~756 MHz) of the LTE class 13 band were about -12 dB and -15 dB, respectively. An average gain of a fabricated antenna with two stubs was observed about -2 dBi above and it showed good results with comparison of business condition that the average gain of commercial handy terminal has to appear -4 dBi above. The measured S-parameter characteristics and radiation patterns showed a reasonable agreement with the simulation results.
Design of a Planar Wideband Microwave Bias-Tee Using Lumped Elements
Jang, Ki-Yeon ; Oh, Hyun-Seok ; Jeong, Hae-Chang ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 384~393
DOI : 10.5515/KJKIEES.2013.24.4.384
In this paper, a design of planar microwave bias-tee using lumped elements was presented. The bias-tee is composed of 2 blocks; DC block and RF choke. For this design of the bias-tee, a wideband capacitor was used for DC block. For a RF choke, a series connection of inductors which have different SRFs is used for a RF choke. In the RF choke, a series connection of resistor and capacitor was added in shunt to eliminate a loss from a series resonance. The designed bias-tee was implemented by using 1608 SMT chip components. The fabricated bias-tee was measured using Anritsu 3680K fixture which enables to remove an effect of a connector. The fabricated bias-tee presented -15 dB of return loss and -1.5 dB insertion loss at 10 MHz~18 GHz.
The Design of Switching-Mode Power Amplifier and Ruggedness Characteristics Analysis of Power Amplifier Using GaN HEMT
Choi, Gil-Wong ; Lee, Bok-Hyoung ; Kim, Hyoung-Joo ; Kim, Sang-Hoon ; Choi, Jin-Joo ; Kim, Dong-Hwan ; Kim, Seon-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 394~402
DOI : 10.5515/KJKIEES.2013.24.4.394
This paper presents design, fabrication and ruggedness test of switching-mode power amplifier using GaN(Gallium Nitride) HEMT(High Electron Mobility Transistor) for S-band radar applications. The power amplifier is designed to Class-F for high efficiency. The input signal for the measurement of the power amplifier is pulse signal at
pulse width and duty cycle of 10 %. The measurement results of the fabricated Class-F power amplifier are a power gain of 10.8 dB, an output power of 40.8 dBm, a power added efficiency(PAE) of 54.2 %, and a drain efficiency of 62.6 %, at the center frequency. We proposed reliability test set-up of a power amplifier for ruggedness test. And we measured output power and efficiency according to VSWR(Voltage Standing Wave Ratio) variation. The designed power amplifier achieved output power of 32.6~41.1 dBm and drain efficiency of 23.4~63 % by changing VSWR, respectively.
Design of a V Band Power Amplifier Using 65 nm CMOS Technology
Lee, Sungah ; Cui, Chenglin ; Kim, Seong-Kyun ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 403~409
DOI : 10.5515/KJKIEES.2013.24.4.403
In this work, a CMOS two stage differential power amplifier which includes Marchand balun, transformer and injection-locked buffer is presented. The power amplifier is targeted for 70 GHz frequency band and fabricated using 65 nm technology. The measurement results show 8.5 dB maximum voltage gain at 71.3 GHz and 7.3 GHz 3 dB bandwidth. The measured maximum output power is 8.2 dBm, input
is -2.8 dBm, output
is 4.6 dBm and maximum power added efficiency is 4.9 %. The power amplifier consumes 102 mW DC power from 1.2 V supply voltage.
The Communication Security Improvement Technology Using Chaos Modulation and Retrodirective Array Antenna
Bok, Junyeong ; Kim, Gi-Young ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 410~416
DOI : 10.5515/KJKIEES.2013.24.4.410
In this paper, we propose a chaotic correlation delay shift keying(CDSK) using digital retrodirective array antenna (RDA) for improving security and receive performance. Chaotic signals provide improved security due to non-periodic and non-predictable performance of chaotic signals. However, the receive performance of these chaotic signals is degraded due to self-interference and interference signals. Therefore, this paper, we analyze the receive BER performance of chaos communication system which has digital RDA based on CDSK modulation schemes for improving security without receive performance degradation. Simulation results show that the proposed system can get the same receiving performance compared to BPSK modulation schemes when array elements of RDA are 5.
Anti-Jamming Performance of Chaos Communications System Using DCSK and CDSK Modulation Method
Lee, Jun-Hyun ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 417~425
DOI : 10.5515/KJKIEES.2013.24.4.417
Digital communication technology have been focused on the higher data efficiency and the effective coding of information. Also, it is very important to improve security and minimize the interference of the external sources, Chaos communications system is studied to improve security and minimize the interference by effective encoding of information in the nonlinear systems such as DCSK(Differential Chaos Shift Keying) and CDSK(Correlation Delay Shift Keying). In this paper, we evaluate anti-jamming performance of chaos communications system using the DCSK and CDSK system. The simulation results show that the Gauss iterated map has better BER performance than the other maps(tent map, logistic map, Henon map). Also, DCSK and CDSK system can get the better anti-jamming performance by applying different chaotic maps.
MIMO Circular Polarization Feed Network for Communication Performance Improvement of Land Mobile Satellite System
Han, Jung-Hoon ; Myung, Noh-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 426~435
DOI : 10.5515/KJKIEES.2013.24.4.426
In this paper, we propose the MIMO circular polarization feed network to enhance the communication performances from the previous
MIMO channel to
channel for Land Mobile Satellite communication system. The only possibility to extend the communication channel is to use the additional satellite because of the limitation of satellite spaces to install additional antennas. For overcoming this problems, we propose the MIMO circular polarization feed network to secure the isolation characteristics without the distant antenna space. The port isolation characteristics and each port impedance matching conditions are numerically verified and we suggest the
MIMO channel model of the proposed system and the performances are verified. The fabricated circular polarization patch antennas with the proposed feed network are measured in the reverberation chamber and 7~10 dB of diversity gain and 80 % increasement of channel capacity are obtained.
Evaluation of IC Electromagnetic Conducted Immunity Test Methods Based on the Frequency Dependency of Noise Injection Path
Kwak, SangKeun ; Kim, SoYoung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 436~447
DOI : 10.5515/KJKIEES.2013.24.4.436
In this paper, Integrated circuit(IC) electromagnetic(EM) conducted immunity measurement and simulation using bulk current injection(BCI) and direct power injection(DPI) methods were conducted for 1.8 V I/O buffers. Using the equivalent circuit models developed for IC electromagnetic conducted immunity tests, we investigated the reliability of the frequency region where IC electromagnetic conducted immunity test is performed. The insertion loss for the noise injection path obtained from the simulation indicates that using only one conducted immunity test method cannot provide reliable conducted immunity test for broadband noise. Based on the forward power results, we analyzed the actual amount of EM noise injected to IC. We propose a more reliable immunity test methods for broad band noise.
Implementation and Performance Analysis of the Adaptive Beamformer with Subarray Architecture
Jang, Youn-Hui ; Hong, Dong-Hee ; Choi, Seong-Hee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 448~458
DOI : 10.5515/KJKIEES.2013.24.4.448
In this paper, we present the performance and the experimental results of the adaptive beamformer in the radar system with the planar active array. The study of the adaptive beamformer has already been performed in several literatures, but it is difficult to find the results or examples those are implemented in the actual radar system. Here we employ the adaptive beamformer to the practical radar system with subarray architecture. The performance of beamformer will be demonstrated by modeling and simulation and finally the far-field experimental results.
Remote Sensing of Soil Moisture Change Using a Differential Interferometry Technique
Park, Sin-Myeong ; Oh, Yisok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 459~465
DOI : 10.5515/KJKIEES.2013.24.4.459
This paper presents a differential interferometry technique for soil moisture change detection by measuring surface-height variation. COSMO-SkyMed SAR images were used to verify the DInSAR(differential interferometric SAR) technique. The soil penetration depth changes according to soil moisture, that causes phase change of the received signal. The height of soil surface and its displacement can be detected by a radar interferometry technique using phase difference of two received signals. To retrieve displacement variation, one of three SAR images is used as a reference image. Reference image and other two images are processed by the differential interferometry technique in the same area. The soil moisture was measured for the test sites to verify the DInSAR technique. The penetration depth is calculated by using the in-situ measured soil moisture data and it is compared with the displacement values acquired by the DInSAR technique.
Analysis and Application of Compact Planar Multi-Loop Self-Resonant Coil of High Quality Factor with Coaxial Cross Section
Son, Hyeon-Chang ; Kim, Jinwook ; Kim, Do-Hyeon ; Kim, Kwan-Ho ; Park, Young-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 4, 2013, Pages 466~473
DOI : 10.5515/KJKIEES.2013.24.4.466
In this paper, a compact planar multi-loop self-resonant coil of high quality factor with a coaxial cross section is proposed for effective wireless charging. The proposed coil has high Q-factor and a resonant frequency of a coil can be easily controlled by adjusting distributed capacitance. For designing the coil, a self-inductance and a distributed capacitance are calculated theoretically. The self-inductance is calculated from the sum of the mutual energies between small circular loops that are made by dividing the cross section of the coil. To verify its properties and calculation results, the self-resonant coils are fabricated by using a coaxial cable with characteristic impedance of
. The measured frequencies are very consistent with the calculated ones. In addition, the resonant frequency can be adjusted slightly by the tuning parameter
. The resonant coils are applied to a tablet PC, the Q-factors of the Tx and Rx resonant coils are 282 and 135, respectively. As a result of measurement when height between the two resonant coils is 4.4 cm, the power transfer efficiency is more than 80 % within a radius of 5 cm.