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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
A Study on Manufacturing Method of High Performance Smart EMW Absorber with Heat Radiating Function and Its Prospects
Kim, Dong Il ; Jeon, Yong Bok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 841~850
DOI : 10.5515/KJKIEES.2015.26.10.841
With the rapid progress of electronics and radio communication technology, human enjoys greater freedom in information communication. However, EMW(Electro-Magnetic Wave) environments have become more complicate and difficult to control. Thus, international organizations, such as the American National Standard Institution(ANSI), Federal Communications Commission(FCC), the Comite Internationale Special des Perturbations Radio Electrique(CISPR), etc, have provided standard for controlling the EM wave environments and for the countermeasure of the electromagnetic compatibility(EMC). In this paper, fabrication of the smart EMW absorber which has heat radiating function and high performance absorption abilities were suggested. Furthermore, we prospected future smart EMW absorbers. The designed smart EMW absorber is fabricated following process. Firstly, we applied high temperature heat treated to a mixture of Iron-oxide(
) and ceramics. Secondly, we applied low temperature heat treated to the mixture of heat treated material and a carbon material. Lastly, we made apertures on the absorber. The designed smart EM wave absorber has the absorption ability of more than 20 dB from 2 GHz to 2.45 GHz band, respectively. Thus, it is respected that these results can be applied as various EMC devices in electronic, communication, and controlling systems.
A Design of Gaussian Beam Guiding System for Cassegrain Antennas
Han, Seog-Tae ; Lee, Jeong-Won ; Kang, Jiman ; Chung, Moon-Hee ; Je, Do-Heung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 851~868
DOI : 10.5515/KJKIEES.2015.26.10.851
A radio telescope which has been dominantly used for millimeter and submillimeter wave radio astronomy is a cassegrain antenna. A various receivers with specified observing bandwidths are installed on cassegrain antenna so as to carry out to investigate a diverse radio astronomy. A beam guiding system should be required so that a various receiver can be conducted their own observational frequency bands. The beam guiding system based on Gaussian beam transmission theory consists of quasi-optical circuit used such ellipsoidal mirror, dielectric lens and feed horn. In this paper, not only Gaussian beam transformations based on Gaussian beam theory are presented, but also design techniques for quasi-optical circuit are given. By using proposed design techniques, both Gaussian beam quasi-optical circuits to be used for cassegrain antenna and design results are also described. Properties of key focusing elements such ellipsoidal mirror and dielectric lens and feed horn are also discussed. It is expected that beam guiding system to be applied cassegrain antenna could be easily designed by using proposed design techniques.
A Study of the Surface Wave Propagation on the Various Types of Grounds
Park, Minseo ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 869~875
DOI : 10.5515/KJKIEES.2015.26.10.869
In this paper, the surface wave that caused the isolation problem when the design of the array antenna is studied. The grounded dielectric slab model is used in order to simulate in the similar environment with the surface wave of the microstrip patch antenna. The propagation of the surface wave on the various types of grounds which are defected ground structure(DGS), perfect magnetic conductor(PMC), Soft-surface, and Hard-surface is simulated. As a result, 25 % power is blocked by the DGS when the TM-wave incident. Also, 95 % power is blocked by the PMC and Soft-surface. This study will be very useful to increase the gain of an array antenna by improving the isolation between the antenna elements.
Design of a 28 GHz Switched Beamforming Antenna System Based on 4×4 Butler Matrix
Park, Seongchun ; Kim, Seunghyeon ; Sohn, Jihoon ; Shin, Hyunchol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 876~884
DOI : 10.5515/KJKIEES.2015.26.10.876
In this paper, a switched beamforming antenna system at 28 GHz frequency band is described for
generation wireless communication. The butler matrix is used as a beamforming system and it produces linear spaced phase difference at four output ports. Array antenna is designed that can be steered in desired 4 different directions 28 GHz frequency band. Operation of designed butler matrix that composed of couplers and feedline is explained. The antenna system is designed in RO3003 substrate that has a height of 5 mil and dielectric constant of 3. The size of butler matrix is
and size of array antenna is
. This system can be steered from
and minimum sidelobe level is 12.9 dB.
Development of On-Board Dual-Band Antenna for Small Walkie-Talkie
Park, Young-bae ; Lee, Sang-suck ; Lee, Young-hun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 885~894
DOI : 10.5515/KJKIEES.2015.26.10.885
In this paper, it can be applied to a walkie-talkie, the RFID / USN 920 MHz band(917~923.5 MHz) and WiFi 2.4GHz band(2.4~2.483 5GHz) return loss is 10 dB over the band, on-board dual band with omni-directional radiation characteristics is proposed. The basic structure designed antenna is used meander monopole antenna. It was used as double stubs and tabs for antenna designs that meet the criteria proposed. The double stub and the tab affects the reactance of the antenna to form a common-mode and differential-mode in the stub to improve the antenna characteristics and return loss in the bandwidth, gain and radiation characteristics. The system size of walkie-talkie is
, the size of the antenna is limited to
, the thickness of FR4 dielectric substrate is 0.8 mm, FR4 dielectric constant 4.4 is used. For experimental results, the return loss is measured more than 10 dB, the maximum gain is measured 1.95 dB, the maximum bandwidth is measured 360 MHz, the radiation characteristic is measured omni-directional. By a walkie-talkie terminal design applying the results of the paper, the handset's price competitiveness and production efficiency can be improved.
Prediction of EFT/B Signal Transfer Characteristics in Mobile Charging Circuit
Song, SeungJae ; Kim, Kwangho ; Jo, Jeongmin ; Lee, Seungbae ; Kim, So-young ; Nah, Wansoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 895~906
DOI : 10.5515/KJKIEES.2015.26.10.895
This paper presents a methodology and a model that can analyze the high frequency transfer characteristics from socket in the AC power port to the 5 V DC output port in the mobile charging circuit. This is to predict the output signals coming from the IEC(International Electrotechnical Commission) Standard(IEC 61000-4-4), EFT/B(Electric Fast Transient and Burst) immunity test for mobile charging circuit. Since the mobile charging circuit is energized from the AC power socket from the power line, it is necessary to know the high frequency transfer characteristics with activated AC power line. A simple CDN(Coupling-Decoupling Network) is designed and manufactured for measuring S-parameters of mobile charging circuit with and without AC power line activated. The result shows that the S-parameters of the specific mobile charging circuits are almost the same, independent of AC power line activation. Consequently, the S-parameters without AC line could be used to predict the output response to the EFT/B signals, and it was shown that the proposed methodology predicts the output responses quite accurately, which proves the validness of the methodology presented in this paper.
Prediction of Near Magnetic Field Distribution of Switching ICs
Kim, Hyun-Ho ; Song, Reem ; Lee, Seungbae ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 907~913
DOI : 10.5515/KJKIEES.2015.26.10.907
This work presents a method to predict the near magnetic field distribution on the digital switching circuit mounted on PCB using co-simulation of circuit and electromagnetic fields. The proposed method first obtains the normalized near field distribution by exciting the signal and power ports of the switching circuit using sinusoidal sources. Then the real near magnetic field distribution is determined by weighting the normalized field distribution using the current spectrum of the switching circuit. To confirm the proposed method, a switching IC with a ring oscillator and a output buffer is fabricated and measured in the form of chip-on-board. The surface magnetic field distribution is measured using a magnetic probe above the PCB and compared with the simulation results. Experimental results show the correspondence between simulation and measurement results within 10 dB up to fifth harmonics.
An Efficient Frequency Utilization Policy for UAS in Hyper-Connectivity Era
Kang, Young-Heung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 914~923
DOI : 10.5515/KJKIEES.2015.26.10.914
UAS(Unmanned Aircraft System) has been used a lot in military applications but recently its usage is expanding to commercial applications due to its recent technical development and its market is expected to grow rapidly in the future. In hyper-connectivity society, especially UAS would play major role as an one of potential infrastructures for the architecture of the next 5G system. The ultimate goal is the successful integration of UAS in NAS(National Airspace System) relies heavily on ensuring reliable spectrum for the robust CNPC(Command and Non-Payload Communication) links as well as payload links for other various applications in the upcoming hyper-connectivity era. In this paper, we have focused on the analysis of the existing frequencies for UAS radio-control and the current issues for CNPC and payload frequencies, and proposed future efficient utilization policy for UAS in the hyper-connectivity society.
Calculation of Radar Echo Signal above Spherical Earth and Its Experimental Validation
Koh, Il-Suek ; Kwon, Sewoong ; Lee, Jong-hyun ; Lee, Kiwon ; Sun, Woong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 924~931
DOI : 10.5515/KJKIEES.2015.26.10.924
When a target locates at low altitude over a curved earth surface and far away from a radar, we examine the accuracy of the conventional formulations to compute the radar echo signal. The 4-ray model is used to calculate the scattering by the target to consider the ground plane effect. In this paper, the diffracted wave is not included. Based on the required parameters able to be calculated by known equations for the estimation of the wave propagation phenomena, the radar echo signal is computed and verified by comparing with measured data sets.
13.56~915 MHz CMOS Rectifier Using Bootstrapping and Active Body Biasing
Jin, Ho Jeong ; Cho, Choon Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 10, 2015, Pages 932~935
DOI : 10.5515/KJKIEES.2015.26.10.932
This paper proposes a rectifier using bootstrapping and active body biasing in
RF CMOS process. The proposed rectifier employs the full-wave rectifying structure with cross coupling and increases the power conversion efficiency by reducing the threshold voltage and leakage current using bootstrapping and active bias biasing. Also, it has been designed to be applied to a wide range of applications from 13.56 MHz used in wireless power transmission to 915 MHz used in RFID. As a measured result, 80 % of power conversion efficiency is obtained when the input power is 0 dBm at
load resistance and 13.56 MHz. Also 40 % of power conversion efficiency is shown in 915 MHz.