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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 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
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Quadruple Polarized Antenna System with a Reconfigurable Feeding Network
Lee, Wang-Sang ; Lee, Dong-Jin ; Tae, Hyun-Sung ; Park, Donghoon ; Oh, Kyoung-Sub ; Lee, Moon-Que ; Yu, Jong-Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 113~121
DOI : 10.5515/KJKIEES.2013.24.2.113
In this paper, quadruple polarized antenna system with a reconfigurable feeding network is presented. The proposed antenna system consists of the reconfigurable feeding network for fourth polarization such as vertical/horizontal linear polarization and right-handed/left-handed circular polarizations or 45 degree tilted vertical/horizontal linear polarization and patch antenna to receive the signals with various polarizations. In order to receive a signal in any direction, the proposed antenna is designed by electrical switches for reconfigurable polarization. The insertion loss of the designed feeding network in the proposed antenna system is approximately 1.2 dB. The measured 3 dB axial bandwidth and gain of the proposed antenna are about 2 % and 4 dBi(c).
Layered-Type Dielectric Waveguide Filter Using Ceramic
Jang, Young-Soo ; Kim, Jong-Chel ; Kim, Seung-Wan ; Lee, Kie-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 122~127
DOI : 10.5515/KJKIEES.2013.24.2.122
Layered-type dielectric waveguide filters were designed. As the order of layers increased the fabrication process for dielectric waveguide filters which the resonator parts were connected by the lateral direction has many difficulties. The proposed structure in this report was designed based on the layered-type for the some parts of resonators. The size of layered-type dielectric waveguide filters installed on the PCB surface were reduced at 25% as compared with the usual waveguide filters by using a relative dielectric constant 22.
Fabrication of GaN Transistor on SiC for Power Amplifier
Kim, Sang-Il ; Lim, Byeong-Ok ; Choi, Gil-Wong ; Lee, Bok-Hyung ; Kim, Hyoung-Joo ; Kim, Ryun-Hwi ; Im, Ki-Sik ; Lee, Jung-Hee ; Lee, Jung-Soo ; Lee, Jong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 128~135
DOI : 10.5515/KJKIEES.2013.24.2.128
This letter presents the MISHFET with si-doped AlGaN/GaN heterostructure for power amplifier. The device grown on 6H-SiC(0001) substrate with a gate length of 180 nm has been fabricated. The fabricated device exhibited maximum drain current density of 837 mA/mm and peak transconductance of 177 mS/mm. A unity current gain cutoff frequency was 45.6 GHz and maximum frequency of oscillation was 46.5 GHz. The reported output power density was 1.54 W/mm and A PAE(Power Added Efficiency) was 40.24 % at 9.3 GHz.
A Monitoring System for Telecommunication Tower Using Wireless Sensor Network
Roh, Sang Bong ; Park, Sang Kyu ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 136~143
DOI : 10.5515/KJKIEES.2013.24.2.136
In this paper, a monitoring system for telecommunication tower using wireless sensor network is presented. Although safety inspection could be judged by eyesight and calculating original design from now, not only this system can protect perils, estimating data exactly, but also it is effective to management. It is also economic because the system costs cheaper expenses for telecommunication tower of setting it once than for the tower of inspecting its safety regularly. This paper proves that the structure can be managed scientifically and efficiently, and the system contributes not only stabilized telecommunication services for users but reducing damages.
Experimental Study on the Effect of Antenna Polarization in WBAN Off-Body Channel
Jeon, Jaesung ; Ahn, Byoungjik ; Kim, Sunwoo ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 144~151
DOI : 10.5515/KJKIEES.2013.24.2.144
This paper investigates the effect of antenna polarization in Wireless Body Area Network(WBAN) off-body channel. The polarizations of antenna are divided into four combinations regarding Line-of-Sight(LOS) and Non-LOS(NLOS) environment. The human body keeps both still standing and moving to show that the impact of the polarization to signal. This paper confirms the performance depending on the polarization of receiver antenna and the combination of the polarizations on the off-body channel.
Power Noise Suppression Methods Using Bead with Spiral Resonator
Chung, Tong-Ho ; Kang, Hee-Do ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 152~160
DOI : 10.5515/KJKIEES.2013.24.2.152
In this paper, to the aim of wideband SSN(Simultaneous Switching Noise) suppression characteristic, investigation of spiral resonator are used in conjunction with bead which is commonly used for noise suppression method. Bead works effectively to suppress the power noise up to the first harmonic of fundamental frequency, 0.8 GHz, and spiral resonator suppress noise well in the frequency range of SRF(Self Resonance Frequency) which is inversely proportional to the length of spiral. Thus, when bead used in conjunction with a spiral the noise suppression characteristic is determined by the one of higher impedance element of the two in the frequency range and achieves more broadband filtering characteristic. The case for using 22 nH bead turns out 4.8, 2.0, 0, and, 0.6 dB, and the case for using 22 nH bead in conjunction with 3-turns spiral achieves more wideband characteristic of 9.5, 8.3, 6.1, and 9.9 dB power noise suppression performances at the first, second, third, and fourth harmonics, respectively. The peak-to-peak voltage levels decrease from 76 mV to 56 mV using 22 nH bead, and the level decrease rapidly to 34 mV when using in conjunction with bead and 3-turn spiral. Thus more wideband SSN suppression characteristic can be achieved using bead with spiral.
Investigation of the Variation of SAR Values in Mice and Rats Depending on the Exposure Conditions in Whole-Body Exposure Environments
Mun, Ji-Yeon ; Seo, Min-Gyeong ; Kim, Tae-Hong ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 161~167
DOI : 10.5515/KJKIEES.2013.24.2.161
In animal experiments for EMF exposure, it is very important to estimate the SAR values accurately in animals. In this paper, we investigated the variation of SAR values in mice and rats, depending on the number and separation distance of animals and the existence of the water-supplying bottle. The whole-body of mice or rats in a cage were exposed in the reverberation chamber at CDMA and WCDMA frequencies. Simulation results show that the variation of the whole-body averaged SAR is larger when several animals are exposed in a cage, compared to the existence of water-supplying bottle and the amount of water. It turns out that compared to single mouse or rat is located in the cage, the maximum variation of the whole-body averaged SAR values for mice at 850 MHz and 1,950 MHz are 15.3 % and 14.9 % when three mice are located in the cage, and those for rats are 18.7 % and 21.1 % for each frequency when two rats are located in the cage. It is concluded that the variation of SAR values depending on the exposure conditions in real situation cannot be ignored.
Analysis and Comparison for a 4-Coil Magnetic Resonance Wireless Power Transfer System
Lee, Gunbok ; Park, Wee Sang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 168~179
DOI : 10.5515/KJKIEES.2013.24.2.168
The critical point analysis(CA) and impedance matching analysis(IA) are performed and compared for a 4-coil magnetic resonance wireless power transfer system. Because the operating frequency splits at short distance while the efficiency drops drastically at long distance in this system, the optimization technique is needed for either a specific distance or efficiency at the fixed frequency. CA uses the critical point where shows maximum efficiency in the entire range and IA uses the impedance matching technique to achieve maximum efficiency at the specific distance. Comparison result shows that IA is more efficient than CA. Also, it shows one side matching has a tradeoff relationship comparing to both side matching. By using four spiral resonant coils, the analysis was experimentally verified. The measured data agreed well with the calculated data.
Performance Evaluation of a W-Band Waveguide Noise Measurement System for Calibrating Noise Sources
Kang, Tae-Weon ; Kim, Jeong-Hwan ; Kwon, Jae-Yong ; Kang, Jin-Seob ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 180~188
DOI : 10.5515/KJKIEES.2013.24.2.180
A W-band waveguide noise measurement system for calibrating noise sources was implemented and its basic characteristics were discussed. The measurement system consists of a commercial noise figure analyzer, a full W-band frequency converter, and a local oscillator. To measure the noise temperature of a noise source, the Y-factor method is generally used. Since the Y-factor method is based on the assumption that the receiving system is linear, linearity is one of important performance parameters of the measurement system. In this paper, the linearities for mixer, intermediate frequency(IF), and RF parts were evaluated to be 0.24 dB, 0.05 dB, and 0.20 dB, respectively. The noise figure of the measurement system evaluated is 5 dB to 17 dB in W-band. The measurement system can be used to measure thermal noise characteristics of electronic and electrical devices, equipments, and systems as well as to calibrate noise sources.
A Study on the Utility of Statistical Power Balance Method for Efficient Electromagnetic Analysis of Large and Complex Structures
Lee, Young-Seung ; Park, Seung-Keun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 189~197
DOI : 10.5515/KJKIEES.2013.24.2.189
With the trend of technological advances in electronic communications and the advent of ubiquitous environments, the density of existing electronic equipment in the surroundings is increasing significantly. It is hence great importance to study the numerically efficient and fast algorithm for complex and large environments to identify their electromagnetic compatibility and interference characteristics of equipments installed in those structure. This paper introduces a statistical-based power balance method(PWB) for the analysis of these problems and considers its practical utility. The 2-dimensional lossy rectangular cavity was numerically revisited to clarify its relationship with the classical deterministic analysis solutions based on the Maxwell`s equation. It can be shown that the statistical assumptions and analysis results from the power balance method correspond to the volume average over the realistic deterministic domain. This statistical power balance approach should be a sufficiently practical alternative to the electromagnetic problem of complex and large environment since it is apparent that the full-wave analysis methods have some severe limits of its computational burdens under the situation of complex and large environment.
A Study of Fuzzy Inference System Based Task Prioritizations for the Improvement of Tracking Performance in Multi-Function Radar
Kim, Hyun-Ju ; Park, Jun-Young ; Kim, Dong-Hwan ; Kim, Seon-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 198~206
DOI : 10.5515/KJKIEES.2013.24.2.198
This paper presents the improvement of tracking performance using fuzzy inference system based task prioritizations for multi-function radars. The presented technique calculates elemental priorities using track information of a target and obtain the total priority from fuzzy inference system of each fuzzy set`s membership function. In this paper, we proposed the task prioritization algorithms based on fuzzy inference system, and evaluated the tracking performance on multi-function radar scenario using it. As a result, we confirmed that excellent performance could be achieved when using the proposed algorithm.
A Study on Bistatic SAR Imaging Using Bistatic-to-Monostatic Conversion in Wavenumber Domain
Cho, Byung-Lae ; Sun, Sun-Gu ; Lee, Jung-Soo ; Park, Gyu-Churl ; Ha, Jong-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 207~213
DOI : 10.5515/KJKIEES.2013.24.2.207
This study describes an omega-K algorithm for focusing bistatic synthetic aperture radar(SAR) data using bistatic-to-monostatic conversion. Bistatic SAR system considered in this study consists of a transmitting antenna and a physical array of several receiving antennas. The length of the physical array is identical to the SAR synthetic aperture. Unlike the monostatic case, an omega-K algorithm for the bistatic case is difficult to obtain the exact equation in the 2D wavenumber domain. The key of the proposed algorithm is converting the bistatic data into a monostatic one. The effectiveness of the proposed algorithm is proved by simulation and real measurement data.
Permittivity Measurement of Thin Film Using a Waveguide-type Resonator with a Slot
Cho, Chihyun ; Kang, Jin-Seob ; Kim, Jeng-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 2, 2013, Pages 214~217
DOI : 10.5515/KJKIEES.2013.24.2.214
In this paper, a waveguide-type resonator with a slot is proposed to measure permittivity of thin film from resonant frequency shifting by an attached MUT(Material Under Test). The MUT on the slot shifts resonant frequency by perturbation of electromagnetic field. Amount of shifting resonance frequency is dependent on the permittivity of MUT, and that relation is obtained from numerical simulation. The measured relative permittivity of a thin film with thickness of
is 3.3492 with standard error of
in the frequency range of 2 GHz to 3 GHz. Also the proposed method is compared with other measuring methods such as dielectric resonator and waveguide probe systems.