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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
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Design of UHF Band Microstrip Antenna for Recovering Resonant Frequency and Return Loss Automatically
Kim, Young-Ro ; Kim, Yong-Hyu ; Hur, Myung-Joon ; Woo, Jong-Myung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 219~232
DOI : 10.5515/KJKIEES.2013.24.3.219
This paper presents a microstrip antenna which recovers its resonant frequency and impedance shifted automatically by the approach of other objects such as hands. This can be used for telemetry sensor applications in the ultrahigh frequency(UHF) industrial, scientific, and medical(ISM) band. It is the key element that an frequency-reconfigurable antenna could be electrically controlled. This antenna is miniaturized by loading the folded plates at both radiating edges, and varactor diodes are installed between the radiating edges and the ground plane to control the resonant frequency by adjusting the DC bias asymmetrically. Using this voltage-controlled antenna and the micro controller peripheral circuits of reading the returned level, the antenna is designed and fabricated which recovers its resonant frequency and impedance automatically. Designed frequency auto recovering antenna is conformed to be recovered within a few seconds when the resonant frequency and impedance are shifted by the approach of other objects such as hand, metal plate, dielectric and so on.
Diversity and Directivity Mode-Switchable Planar Antenna Array
Choe, Hyeonhyeong ; Lim, Sungjoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 233~238
DOI : 10.5515/KJKIEES.2013.24.3.233
In this paper, a novel diversity and directivity mode-switchable planar antenna array is proposed. For the diversity mode, four elements are unfolded on the plane and high isolation can be achieved. On the other hand, the antenna function is changed to the directivity mode when they are folded and stacked. Each element works such as a stacked Yagi-Uda antenna with high directivity. Especially, the curved feed line as well as the hybrid feeding method is used to improve performances. The simulation results agree well with measurement results and it is successfully demonstrated that two modes are properly working at 2.4 GHz.
Design of a Dual-Band On-Body Antenna for a Wireless Medical Repeater System
Kwon, Kyeol ; Tak, Jinpil ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 239~246
DOI : 10.5515/KJKIEES.2013.24.3.239
In this paper, a dual-band on-body antenna operating at MICS and ISM band for a wireless medical repeater system is proposed and the antenna performance including the human body effect is investigated. The designed dual-band antenna is comprised of a top patch for ISM band and bottom patch for MICS band. Simulation and measurement was carried out in order to analyze the effects of human body on antenna performance considering real use. The proposed antenna has required impedance bandwidth enough to cover both MICS and ISM bands. The measured peak gains were -12.47 dBi and 1.71 dBi at the each center frequency of MICS and ISM bands, respectively. Furthermore, the antenna has the maximum radiation directed toward the inside of the human body in the MICS band and directed toward the outside in the ISM band. In addition, the return loss property of the antenna is insensitive to human body effects so that the proposed antenna is well suited for the on-body wireless medical repeater system.
Frequency-Scanning Type Microwave Tag System Using Defected Ground Structures
Lee, Seok-Jae ; Han, Sang-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 247~252
DOI : 10.5515/KJKIEES.2013.24.3.247
In this paper, a microwave tag system of a frequency-scanning type is proposed with multi-resonators using defected ground structures. While a conventional chip-based RFID stores time-sequential codes, the proposed type achieves pure passive tags by using multi-resonant bits over a frequency range. Moreover, the resonators of the spiral defected ground structures implemented on the back side of transmission lines have advantages of the excellent bandstop characteristics as well as the bit-error avoidance by the re-radiation on normal resonators. The proposed microwave tag is designed with UWB antennas at 3~7 GHz. From the experimental results in an anechoic chamber, it has been verified of the excellent recognitions for various 5-bits identification codes.
W-Band Permittivity Measurements Using a Free-Space Material Measurement Technique
Kang, Jin-Seob ; Kim, Jeong-Hwan ; Cho, Chihyun ; Kim, Dae-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 253~258
DOI : 10.5515/KJKIEES.2013.24.3.253
In this paper, a free-space material measurement technique is discussed in W-band(75~110 GHz). For the accurate measurement of S-parameters of an MUT(Material Under Test) in free space, a W-band quasi-optical free-space material measurement system, less affected by the measurement environments, is discussed, and GRL(Gated Reflect Line) method for calibrating the measurement system is described. Proposed technique is verified for 'Air' and measurement results for arystal plates of thickness 1.1 mm, 2 mm, 2.75 mm and 5 mm are also shown.
Punched-SIW Multi-Section E-Plane Transformer
Cho, Hee-Jin ; Byun, Jindo ; Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 259~269
DOI : 10.5515/KJKIEES.2013.24.3.259
In this paper, we propose an SIW(Substrate Integrated Waveguide) multi-section E-plane transformer using air-holes for an SIW system with variable thicknesses. Air-holes are inserted into a SIW E-plane quarter wavelength transformer for matching an E-plane impedance discontinuity. A PSIW(Punched Substrate Integrated Waveguide) consisted of air-holes has an SIW characteristic impedance tunability because of reducing a equivalent shunt capacitance of the SIW. And, a PSIW multi-section E-plane transformer is implemented for improving a matching bandwidth by using the Chebyshev polynomial. The measurement results of PSIW double-section E-plane transformer show that the insertion loss(
dB and input return loss(
) is more than 15 dB from 11.45 GHz to 13.6 GHz.
A Wideband Ridge SIW-to-SIW Transition for Microwave Applications
Jeon, Jiwon ; Byun, Jindo ; Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 270~277
DOI : 10.5515/KJKIEES.2013.24.3.270
In this paper, we propose a wideband ridge SIW(Ridge Substrate Integrated Waveguide)-to-SIW(Substrate Integrated Waveguide) transition. The proposed transition structure is designed to acquire a wide bandwidth by inserting through via holes at the regular interval for an impedance matching and an E-field mode matching method. The measurement results show a fractional bandwidth is 29.1 % at 20 dB return loss from the center frequency(11 GHz). The maximum insertion loss is 0.49 dB from 9.21 GHz to 12.41 GHz.
A 100~110 GHz LNA and A Coupler Using Standard 65 n CMOS Process
Kim, Jihoon ; Park, Hongjong ; Kwon, Youngwoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 278~285
DOI : 10.5515/KJKIEES.2013.24.3.278
In this paper, a 100~110 GHz LNA and A coupler using standard 65 n CMOS process is presented. The LNA consists of three common source FET stages. A few layout types are considered to get high gain characteristic of unit common source cell. Also, optimized performance to achieve low noise characteristic and enough gain. Coupler is composed of broadside coupler using multimetal in CMOS fabrication. In the coupler, the metal strip to meet density rule is used, and the coupler is designed with consideration of the metal strip to function properly. Gain of fabricated LNA is 5.64 dB at 100 GHz and 6.39 dB at 110 GHz. Bandwidth is over 10 % and noise figure is 11.66 dB at 100 GHz. Fabricated coupler has shown insertion loss of 2~3 dB at 100~110 GHz band. Magnitude mismatch of coupler is below 1 dB and phase mismatch of coupler is below
Compact Rectenna System Design Using a Direct Impedance Matching Method
Choi, Taemin ; Han, Sang-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 286~291
DOI : 10.5515/KJKIEES.2013.24.3.286
In this paper, a compact rectenna system is designed using a circular sector antenna with harmonic-rejecting characteristics and a direct impedance matching method. The system is designed with bandpass filtering performed by the harmonic-rejection of the circular sector antenna and without impedance matching circuit for the diodes by the direct impedance matching technique. Therefore, while the rectifying circuit of the proposed system can be implemented without a bandpass filter and a impedance matching circuit, it is integrated on the back side of the antenna using precise fabrication techniques for coaxial feedings without degrading the system performances corresponding to the feeding points. From the experimental results, the optimized rectenna system has presented excellent performances of a conversion efficiency of more than 52 % and a conversion voltages of more than 1.5 V at 2.5 GHz.
A Study on Signal Processing of the Length Estimation of Missile Target Using RELAX
Jo, Hee-Jin ; Choi, Gak-Gyu ; Han, Seung-Ku ; Kim, Kyung-Tae ; Song, Sung-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 292~298
DOI : 10.5515/KJKIEES.2013.24.3.292
A signal processing technique is introduced in this paper in order to estimate the lengths of missile targets. To measure the length of a target, it is necessary to know the information on the target's location and aspect angle. Chirp waveforms and stretch processing are used to estimate the location and angle of a missile as well as HRRP(High Resolution Range Profile). RELAX(relaxation) algorithm, which is one of the spectral estimation techniques, were used to find scattering centers of a missile from HRRP. From the information on the distribution of one-dimensional(1-D) scattering centers on a target, we can discriminate the length of a missile.
High Resolution Spaceborne SAR Operation and Target Recognition Simulator Using STK
Lee, Bo-Yun ; Lee, Seul-Ki ; Lee, Woo-Kyung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 299~309
DOI : 10.5515/KJKIEES.2013.24.3.299
A comprehensive SAR(Synthetic Aperture Radar) simulation is considered to be a complicated task since a full knowledge of the signal propagation characteristics, antenna pattern, system internal errors and interference noises should be taken into account. In high resolution target application modes, the time varying nature of target RCS(Radar Cross Section) strongly affects the generated SAR images. In this paper, in-depth SAR simulations are performed and analyzed incorporating the STK tools and MATLAB software. STK provides realistic orbit parameters while its radar module helps to extract accurate radiometric parameters of ground targets. SAR raw data corresponding to a given target is generated and processed using MATLAB simulator. The performance is measured by PSLR(Peak Sidelobe Ratio) and ISLR(Integrated Sidelobe Ratio) for a point target, which can be used as reference parameters for accurate radiometric calibration. Finally, high resolution target simulations are performed by adopting time varying target RCS characteristics.
Measurement of the Propagation Constant of a Power Cable Using a Two-Port Time-Domain Reflectometry Technique
Shin, Dong Sik ; Cho, Hyeon Dong ; Park, Wee Sang ; Yi, Sang-Hwa ; Sun, Jong-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 310~315
DOI : 10.5515/KJKIEES.2013.24.3.310
This paper presents a two-port time-domain reflectometry(TDR) measurement technique for extracting the complex propagation constant of a cross-linked polyethylene(XLPE) cable. For the extraction, a short pulse transmitted through the cable is measured in the time domain and analyzed in the frequency domain. The propagation constant of a 22.9 kV XLPE cable with a conductor area of 325
is extracted up to a frequency of approximately 2.14 GHz. The
measured using a network analyzer and the two-port TDR technique are compared for verification. As a result compared with previous TDR method, the upper possible frequency limit for extracting the propagation constant increases and the measurement error decreases.
A Study on Near-Field to Far-Field Transformation Using Stratton-Chu Formula
Lee, Jeong-Seok ; Song, Tae-Lim ; Du, Jin-Kyoung ; Koo, Tae-Wan ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 316~323
DOI : 10.5515/KJKIEES.2013.24.3.316
This paper deals with the near-field to far-field calculation for far-field characteristics of antenna and electromagnetic compatibility(EMC) testing. Since the conventional EMC testing process is inefficient such as measurements of the wide band signals and mega structures, Stratton-Chu formula is used to predict the far-field emission by simple and direct process. The usefulness of Stratton-Chu formula is verified by comparing to the analytic solution of the uniform distribution aperture in free-space. In order to inspect the far-fields and to get the near-field values, full-wave simulation solver is utilized. Through the full-wave simulation about the patch antenna, calculated far-field results from Stratton-Chu formula are proven. The predicted magnitudes of the far-field are in error by less than 6 %.
Analysis of Electromagnetic Wave Scattering Characteristics of Dielectric Barrier Discharge Plasma
Lee, Soo-Min ; Oh, Il-Young ; Hong, Yong-Jun ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 324~330
DOI : 10.5515/KJKIEES.2013.24.3.324
This paper presented measurement results of scattering characteristics of dielectric barrier discharge (DBD) plasma at atmospheric pressure. In this paper, plasma actuator is fabricated by parallel connecting of basic configuration of DBD plasma actuator, then plasma could be generated by applying 14 kV, 4 kHz of high voltage generator. In order to measure the scattering characteristics of DBD plasma, in this paper, two horn antennas and vector network analyzer are used to compare the S-parameter. Because of the structure of fabricated plasma generator, different result is obtained as antenna polarization changes. When antenna polarization is parallel to electrodes of plasma generator, the scattered field is reduced by 2 dB in maximum. In addition, for parallel polarization case, PEC is set up behind the plasma generator to measure backward scattered field. When the observation angles are
, the amount of reduced scattered field is 2 dB in maximum at 5 GHz.
Electromagnetic Characteristics of Dielectric Barrier Discharge Plasma Based on Fluid Dynamical Modeling
Kim, Yu-Na ; Oh, Il-Young ; Hong, Yong-Jun ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 331~336
DOI : 10.5515/KJKIEES.2013.24.3.331
In this paper, plasma modeling is achieved using fluid dynamics, thereby electron density is derived. The way proposes the key to overcoming the limitations of conventional researches which adopt simplified plasma model. The result is coupled with Maxwell-Boltzmann system in order to calculate scattering waves in various incident angle. The first part is dedicated to perform plasma modeling in dielectric barrier discharge(DBD) structure. Suzen-Huang model is adopted among various models due to the fact that it uses time independent variables to calculated potential and electron distribution in static system. The second part deals with finite difference time domain(FDTD) scheme which computes the scattered waves when the modulated Gaussian pulse is incident. Founded on it, radar cross section(RCS) is observed. Consequently, RCS is decreased by 1~2 dB with DBD plasma. The result is analogous to the RCS measurement in other researches.
Time-Efficient SE(Shielding Effectiveness) Prediction Method for Electrically Large Cavity
Han, Jun-Yong ; Jung, In-Hwan ; Lee, Jae-Wook ; Lee, Young-Seung ; Park, Seung-Keun ; Cho, Choon-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 337~347
DOI : 10.5515/KJKIEES.2013.24.3.337
It is generally well-known that the inevitable high power electromagnetic wave affects the malfunction and disorder of electronic equipments and serious damages in electronic communication systems. Hence, it is necessary to take measures against high power electromagnetic(HPEM) wave for protecting electronic devices as well as human resources. The topological analysis based on Baum-Liu-Tesche(BLT) equation simplifying the moving path of electromagnetic and the observation points and Power Balance Method(PWB) employing statistical electromagnetic analysis are introduced to analyze relatively electrically large cavity with little time consumption. In addition to the PWB method, full wave results for cylindrical cavity with apertures and incident plane wave are presented for comparison with time-consumption rate according to the cavity size.
A Tapered Slot Antenna with Asymmetric Corrugations for a Microwave Brain Imaging System
Lee, Juneseok ; Park, Joongki ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 348~351
DOI : 10.5515/KJKIEES.2013.24.3.348
Recently, a brain imaging system with microwave devices has been proposed. The brain imaging system requires a small antenna which has ultra wide band(UWB) operating frequency bandwidth(0.5~2 GHz) and non-varying boresight of antenna over the frequency band. This paper proposes asymmetric corrugations on a tapered slot antenna (TSA) so that the size of the TSA is reduced by 14 % while 10 dB return loss bandwidth is satisfied over the operating frequency band from 0.5 GHz to 2 GHz. A miniaturized TSA with symmetric corrugations shows tilted boresight whilst frequency is getting lower; however, the proposed TSA with asymmetric corrugations maintains direction of boresight for different frequencies. This enhancements make an asymmetric corrugated TSA meet the requirement of the brain imaing system.
Design of a High Power Frequency Tuneable Resonator for Wireless Power Transfer
Park, Jaesu ; Choi, Jaehoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 3, 2013, Pages 352~355
DOI : 10.5515/KJKIEES.2013.24.3.352
In this paper, a high power tuneable resonator for a wireless power transfer system based on magnetic resonance is proposed. A spiral structure is used for a self-resonant coil and tuneable trimmer capacitors are added at the edges of resonant coils such that the frequency can be easily tuned. 3D simulation tools and equivalent circuit modeling method are used for predicting self-resonant frequency and scattering parameters according to the change of capacitor values. From the measurement of the prototype WPT system, the resonant frequency could be controlled from 3.0 MHz to 4.5 MHz and the transmission efficiency way over 50 % when the distance between transmitting coil and receiving coil was 160 mm.