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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 23, Issue 12 - Dec 2012
Volume 23, Issue 11 - Nov 2012
Volume 23, Issue 10 - Oct 2012
Volume 23, Issue 9 - Sep 2012
Volume 23, Issue 8 - Aug 2012
Volume 23, Issue 7 - Jul 2012
Volume 23, Issue 6 - Jun 2012
Volume 23, Issue 5 - May 2012
Volume 23, Issue 4 - Apr 2012
Volume 23, Issue 3 - Mar 2012
Volume 23, Issue 2 - Feb 2012
Volume 23, Issue 1 - Jan 2012
Selecting the target year
A Comparison of Antenna Factor Characteristics for a Calculable Dipole Antenna by MoM and EMF Method
Kim, Ki-Chai ; Kim, Sang-Myeong ; Kim, Ki-Chul ; Kwon, Jae-Yong ; Kang, Tae-Weon ; Kim, Jeong-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 275~282
DOI : 10.5515/KJKIEES.2012.23.3.275
This paper presents a comparison of antenna factor characteristics computed by the Method of Moments(MoM) and the electromotive force(EMF) method for a calculable dipole antenna with a hybrid balun. An expression for the antenna factor is formulated using the concept of power mismatch loss. The input impedance and effective length of the antenna, which are in the formula of the antenna factor, are calculated using the two methods. The results show that the antenna factors are agreed within 0.24 dB, although the maximum difference between the input impedances obtained from the two methods is about 17
Compact Antenna Design for the UWB Lower Half-Band WVAN Gbps Data-Rate Transceiver
Eom, Da-Jeong ; Lim, Dong-Jin ; Kahng, Sung-Tek ; Lee, Seung-Sik ; Choi, Sang-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 283~291
DOI : 10.5515/KJKIEES.2012.23.3.283
In this paper, a compact antenna is designed for the UWB lower half-band WVAN Gbps data-rate transceiver. The proposed antenna broadens the bandwidth less than -10 dB by placing the ring stubs and an open stub on the rectangular monopole above the partial ground and creating multiple resonant current paths. The designed antenna goes through the electromagnetic simulation and is fabricated and the implemented antenna has the characteristics of the return loss lower than -10 dB, the antenna gain greater than 5 dBi, and the efficiency over 80 % in the UWB lower half-band ranging from 3.197 GHz to 4.732 GHz. Therefore, it is thought that the proposed antenna is suitable for the size-reduced and excellently performing wireless communication transceiver.
Design of Circularly Polarized Multi Band Antenna for Non-Linear Junction Detector System
Kim, Jeong-Won ; Min, Kyoeng-Sik ; Park, Chan-Jin ; Jeong, Jae-Hwan ; Lee, Sak ; Kwon, Hae-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 292~299
DOI : 10.5515/KJKIEES.2012.23.3.292
This paper proposes the design of circularly polarized multi band antenna for a non-linear junction detector (NLJD) system. In order to design for broad bandwidth, the CPW (Co-Planar Waveguide) feeding method is considered in this design. In order to realize the circular polarization, the axial ratio was controlled by inserting a
inclined slot on radiating element and by cutting an edge of the radiating patch. Measurement results of return loss, bandwidth, axial ratio, polarization pattern and gain are agreed well with their simulation results in interested frequency band at 2.4~ 2.44 GHz, 4.84~4.92 GHz, and 7.28~7.32 GHz.
A Miniaturized and Band Rejection Characteristic of Bow-Tie Monopole UWB Antenna
Choi, Hyung-Seok ; Choi, Kyoung ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 300~305
DOI : 10.5515/KJKIEES.2012.23.3.300
In this paper, a miniaturized bow-tie monopole UWB antenna with band rejection characteristic is proposed. To miniaturize the proposed antenna, a perfect magnetic wall(PMW) condition is applied to primitive bow-tie monopole antenna. An uneven ground patch, a tapered feeding structure and a edge-chopped main patch are adapted for impedance matching. A quater-lambda slot resonator is inserted at main patch to prevent interference in UWB band from another band. The proposed antenna is fabricated on Taconic RF60-A substrate with relative permittivity of 6.15. The size of the proposed antenna is
, which is only 45 % of the conventional bow-tie monopole antenna. The proposed antenna covers full UWB band with return losses less than -10 dB and has band stop characteristic in 5 GHz WLAN band. The maximum gains are within -1.0~5.0 dBi, the group delay variations are within 1.0 ns and the radiation patterns show directivity characteristics in x-y plane.
Isolation Enhancement between Two Dual-Band Microstrip Patch Antennas Using EBG Structure without Common Ground Plane
Choi, Won-Sang ; Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 306~313
DOI : 10.5515/KJKIEES.2012.23.3.306
In order to enhance the isolation level between two dual-band E-slot microstrip patch antennas, EBG structure which operates in UMTS Tx(1.92~1.98 GHz) and Rx(2.11~2.17 GHz) band is proposed. The proposed EBG structure made with a periodic array of two different size EBG unit cells which has a modified mushroom-type for isolation improvement between two antennas. They do not share a common ground plane of the microstrip patch antenna. Overall size of the fabricated antenna is
. The two different EBG unit cell sizes are
, respectively. It was etched on the FR-4 substrate(thickness=3.93 mm,
=4.6). The experiment results show that the isolation level between antennas in Tx/Rx band were improved by about 9 dB and 12 dB, respectively, through the use of the proposed EBG structure.
Design of a WBAN Repeater Antenna for MICS and ISM Bands
Lee, Ho-Joo ; Kwon, Kyeol ; Lee, Soon-Yong ; Choi, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 314~319
DOI : 10.5515/KJKIEES.2012.23.3.314
In this paper, a repeater antenna operating at MICS and ISM bands is proposed and the antenna performance including the human body effect is investigated. The proposed antenna is composed of a ZOR(Zeroth Order Resonator) and a loop antenna. A loop antenna is operated at ISM band and a loop antenna capacitively coupled with a ZOR acts as an antenna for MICS band. Simulation was carried out in order to analyze the effects of human body on antenna performance when a human body is located in the near field of an antenna. According to the simulated and measured results, the proposed antenna has -10 dB
bandwidth wide enough to cover both MICS and ISM bands. The measured peak gains are -28.53 dBi and 3.85 dBi at MICS and ISM band, respectively. The dual band and radiation properties of the proposed antenna are well suited for the WBAN repeater system.
SRR and CSRR Loaded UWB Antenna with Tri-Band Notch Capability
Yoo, Min-Yeong ; Lim, Sung-Joon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 320~327
DOI : 10.5515/KJKIEES.2012.23.3.320
In this paper, a novel ultra wide band(UWB) antenna with tri-band notch capability is proposed. The proposed antenna can reject WiMAX(3.3~3.7 GHz), WLAN IEEE 802.11a/n(5.15~5.825 GHz), and ITU(8.025~8.4 GHz) bands. Band rejection capability is achieved only split ring resonators(SRRs) and complementary SRRs(CSRRs). The SRR under the radiating patch, the CSRR loaded on the radiating patch, and the CSRRs on the ground of the CPW feeding reject the WiMAX, WLAN, and ITU bands, respectively. The simulation and measurement results demonstrate the performances of the proposed antenna.
A Design of Wide-Band PIFA for 700 MHz LTE Band
Park, Chan-Jin ; Min, Kyoeng-Sik ; Kim, Jeong-Won ; An, Seong-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 328~334
DOI : 10.5515/KJKIEES.2012.23.3.328
This paper proposes a design technique of wide-band antenna for handy phone with 700 MHz LTE(Long Term Evolution) low frequency bandwidth. The proposed antenna based on the PIFA(Planar Inverted-F type Antenna) structure was designed and considered. In order to realize the wide bandwidth, a round structure which is able to control the electric path length of current and a branch line element which can be obtain the dual resonance characteristics were introduced in this design. As a result, It was realized about 95 MHz bandwidth in spite of very small space of
used for FR-4 substrate with relative permitivity of 4.4 at 700 MHz band. Measurement results of return loss, bandwidth and gain radiation pattern were agreed well with their calculation results.
High-Isolation Ka-Band Power Combiner Using a Resistive Septum Inserted in a Slit of Waveguide
Kim, Choul-Young ; Shin, Im-Hyu ; Lee, Man-Hee ; Joo, Ji-Han ; Lee, Sang-Joo ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 335~342
DOI : 10.5515/KJKIEES.2012.23.3.335
A high-isolation Ka-band WR-28 waveguide power combiner is designed and implemented using a resistive septum. The waveguide power combiner developed here is an E-plane T-junction type with a TaN resistive septum inserted in a slit of waveguide junction. The fabricated waveguide power combiner shows a return loss better than -20 dB and an insertion loss less than 0.1 dB. Also the measurement shows isolation levels of 20 dB or more almost all over the band and in particular 25 dB or more below 37 GHz. The amplitude and phase imbalance are measured to be less than 0.1 dB and
High-Q Spiral Zeroth-Order Resonators for Wireless Power Transmission
Park, Byung-Chul ; Park, Jae-Hyun ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 343~354
DOI : 10.5515/KJKIEES.2012.23.3.343
In this paper, various spiral zeroth-order resonators are proposed for wireless power transmission. Since a zerothorder resonance(ZOR) mode of meta-material transmission lines has the characteristic of an infinite wavelength, its frequency is independent of physical length. Also, to obtain high transmission efficiencies high-Q resonators and strong coupling coefficient between coupled resonators are required. Therefore, the resonators consist of spiral inductor and lumped capacitor to use the ZOR mode and they are optimized via parametric study and circuit analysis for a high-Q resonator design. The optimized resonators are simulated and compared with a conventional spiral resonator and one of them was fabricated and measured. The fabricated one has a dimension of
) and the transmission efficiency of 80 % is measured at 13.56 MHz at transmitted distance of 40 cm.
Design of Triangular-Patch Type Low Pass Filter
Oh, Song-Yi ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 355~360
DOI : 10.5515/KJKIEES.2012.23.3.355
In this paper, an stepped-impedance low pass filter(SI-LPF) of triangular-patch type is proposed. A SI-LPF designed according to the standard SI-LPF design procedure is folded as a right angled triangle. The figure of merits of this structure are the adjustabilities of the cut off frequency, the stopband and the attenuation pole frequency of the proposed LPF by varying the resultant slots after folding the SI-LPF compactly for miniaturization. The size of the fabricated LPF is
, which is 24.4 % reduced one compared to that of the conventional SI-LPF. The measured results of the LPF show return loss of less than -10 dB at passband, insertion loss of less than -10 dB at stopband and wide stopband from 3.5 GHz to 10 GHz (about
Design of a Low Power Capacitor Cross-Coupled Common-Gate Low Noise Amplifier
Shim, Jae-Min ; Jeong, Ji-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 361~366
DOI : 10.5515/KJKIEES.2012.23.3.361
This paper proposes a low power capacitor cross-coupled 5.2 GHz band low noise amplifier(LNA) using the current-reused topology with the TSMC 0.18
CMOS process. The proposed 5.2 GHz band LNA uses a capacitor cross-coupled
-boosting method for reducing current flow of circuit and a current-reused topology to decrease total power dissipation. The parallel LC networks are used to reduce size of spiral inductors. The simulation results show high gain of 17.4 dB and noise figure(NF) of 2.7 dB for 5.2 GHz.
A Design of Adaptive Impedance Tuning Circuit for UHF-Band Using λ/4 Transmission Line and π-Network
Hwang, Soo-Sul ; Hong, Sung-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 367~376
DOI : 10.5515/KJKIEES.2012.23.3.367
This paper describes a Adaptive Impedance Tuning Circuit which can be adaptively tuned between circuit's characteristic impedance and the arbitrary load impedance. The Adaptive Impedance Tuning Circuit is consisted of such parts as mismatch sensor, impedance tuner and tuning algorithm. Each parts's design methods proposed in other papers are compared with their advantages and disadvantages. And we propose simple design method for Adaptive Impedance Tuning Circuit using a
transmission line and
-network. Calculation formulas and selection algorithm from calculated values of a complex load impedance are proposed and simulation using induced calculation formulas and selection algorithm is performed. Simulation results show good agreement with theoretical predictions.
Wake-Up Receiver System Design Using the DGS Rectenna
Choi, Tae-Min ; Lee, Seok-Jae ; Lee, Hee-Jong ; Lim, Jong-Sik ; Ahn, Dal ; Han, Sang-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 377~383
DOI : 10.5515/KJKIEES.2012.23.3.377
In this paper, a new design of a planar rectenna system and its application to a wake-up receiver operating for incoming signal with a specified frequency are proposed for low-power sensor system applications. The planar and integrable rectenna system is designed with DGSs(Defected Ground Structures) at 2.4 GHz. The DGSs reject harmonic components of 4.8 and 7.2 GHz and eliminate 2.4 GHz fundamental frequency for DC-path filtering. The rectenna system has been evaluated for the conversion output voltages, and applied to the switching of a power supply at the low-power sensor receivers. The proposed system has been evaluated for the wake-up performance by testing a lownoise amplifier operation. From the experimental results, the proposed receiver system presents excellent operation performances.
Electromagnetic Modeling of Shielding Effectiveness of Reinforced Concrete Walls
Hyun, Se-Young ; Lee, Kyung-Won ; Kim, Min-Suk ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 384~391
DOI : 10.5515/KJKIEES.2012.23.3.384
In this paper, reinforced concrete structures are modeled and analyzed. Reinforced concrete has been an essential element in the construction and one that is provided for shielding effectiveness at particular frequencies by rebar placed as a set up in the form of a grid. Using commercial 3-dimensional electromagnetic(3D EM) tool to analyze the reinforced concrete structure, the procedure of analysis for reinforced concrete is computed by dividing concrete, rebar and entire reinforced concrete. The spacing of rebar is bigger, transmission coefficient is higher and the diameter of rebar is bigger, transmission coefficient is lower. Also, in case of two layers is analyzed by gap of layers. Using single layer rebar that thickness of rebar given by 10, 20 and 30 mm have transmission coefficient of -1.89, -2.73 and -4.76 dB/10 cm at 500 MHz. Also, two layers rebar obtain -1.89, -2.73 and -4.76 dB/10 cm for same conditions.
Electromagnetic Modeling of High Altitude Electromagnetic Pulse Coupling into Large-Scale Underground Multilayer Structures
Kang, Hee-Do ; Oh, Il-Young ; Kim, Jung-Ho ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 392~401
DOI : 10.5515/KJKIEES.2012.23.3.392
This paper gives a electromagnetic coupling mechanism of the high altitude electromagnetic pulse (HEMP) into large- scale underground multilayer structures using analytic and numerical methods. The modeling methods are firstly addressed to the HEMP source which can be generated by intentional nuclear explosion. The instantaneous and intense electromagnetic pulse of the HEMP source is concerned from DC to 100 MHz band, because the power spectrum of the HEMP is rapidly decreased under -30 dB over the 100 MHz band. Through this range, a penetrated electric field distribution is computed within the large-scale underground multilayer structures. As a result, the penetrated electric field intensities at 0.1 and 1 MHz are about 10 and 5 kV/m, respectively. Therefore, additional shielding techniques are introduced to protect buried structures within the large-scale underground structures such as high-lossy material and filtering structures (wire screen).
Design of a Metamaterial Unit Cell Using an Interdigital Capacitor with Non-Bianisotropic Property
Kwon, Kyeol ; Ha, Jae-Geun ; Lee, Young-Ki ; Choi, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 402~405
DOI : 10.5515/KJKIEES.2012.23.3.402
In this paper, we proposed a novel metamaterial unit cell utilizing an interdigital capacitor(IDC) with non-bianisotropic property. Due to the induced magnetic resonance of an IDC unit cell, exotic effective constitutive parameters can be realized like a split ring resonator(SRR). Furthermore, the proposed unit cell is electrically smaller than a conventional SRR unit cell. The effective parameters retrieved from the transmission responses of waveguide measurement method and simulated results show good agreement.
Polarization-Dependent Electromagnetically-Induced Transparency by Using Metamaterial
Park, Jin-Woo ; Kim, Sung-Il ; Jang, Won-Ho ; Lee, Young-Pak ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 406~409
DOI : 10.5515/KJKIEES.2012.23.3.406
The classical electromagnetically-induced transparency(EIT)-like switching in metamaterial was experimentally and theoretically demonstrated in the microwave-frequency region. The metamaterial unit cell consists of two identical split-ring resonators, which are arranged on both sides of a dielectric substrate with asymmetry. It is found that the classical EIT-like switching can be achieved by changing the polarization of the incident electromagnetic wave. The results of this study are promising for practical applications.
Performance Comparison to Solve Angle Ambiguity Needed to Angle of Arrival Estimation in 2D Radar Interferometer
Cho, Byung-Lae ; Lee, Jung-Soo ; Lee, Jong-Min ; Sun, Sun-Gu ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 3, 2012, Pages 410~413
DOI : 10.5515/KJKIEES.2012.23.3.410
This study describes the performance comparison to solve angle ambiguity needed to angle of arrival estimation in 2D radiometer. There are three algorithms to solve its ambiguity such as phase-comparison monopulse method, digital beam-forming method and least square error of the phase difference in 2D radar interferometer. To estimate two direction angles, phase-comparison monopulse method is sequentially applied to azimuth and elevation direction. To analyze the performance of these methods, probability of solving angle ambiguity and execution time have been chosen as performance indexes. Through the Monte Carlo simulation, we have verified that phase-comparison monopulse method is most effective in real-time signal processing application.