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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 13, Issue 10 - Dec 2002
Volume 13, Issue 9 - Oct 2002
Volume 13, Issue 8 - Sep 2002
Volume 13, Issue 7 - Aug 2002
Volume 13, Issue 6 - Jul 2002
Volume 13, Issue 5 - Jun 2002
Volume 13, Issue 4 - Apr 2002
Volume 13, Issue 3 - Mar 2002
Volume 13, Issue 2 - Feb 2002
Volume 13, Issue 1 - Jan 2002
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Design and Fabrication of NRD Guide Filter using Inductive Iris
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 741~747
In this paper, NRD guide band pass filter with newly designed inductive iris structure is proposed and analyzed with its test results. In case of common NRD guide filter with air gap coupled structure, it was not easy to fabricate and process or each NRD guide dielectric resonator blocks using PTFE. However, in this our research, each dielectric resonator fabricated in a single NRD guide is coupled with inductive iris located on metal plates. The structure is suitable for mass production of a precise and reliable millimeter-wave filter applications. As a result of measurements, designed NRD guide inductive iris filter has superior performance. The pass band is 38.66~39.06 MHz with 400 MHz bandwidth, insertion loss is about 1.4 dB and return loss is below -18 dB.
A Novel RF Active Bandpass Filter with Low Noise Performance
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 748~753
In this paper, a new topology of a active capacitor is proposed in order to apply the resonator in the design of RF active bandpass filters. Through the noise analysis of the active capacitor, the optimized low noise design process is also presented, Due to the low noise performance of the proposed active bandpass filter, it can be used in the RF front-end of the receivers. In designed 2-stage active bandpass filter at 1.9 GHz shows insertion loss of 0 dB, noise figure of 2.6 dB, and OIP3 of 8 dBm.
Improved Power Performances of the Size-Reduced Amplifiers using Defected Ground Structure
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 754~763
This paper discusses the improved power performances of the size-reduced amplifier using defected ground structure (DGS). The slow-wave effect and enlarged electrical length occur due to the additional equivalent circuit elements of DGS. Using these properties, it is possible to reduce the length of transmission lines in order to keep the same original electrical lengths by inserting DGS on the ground plane. The matching and performances of the amplifier are preserved even after DGS patterns have been inserted. While there is no loss in the size-reduced transmission lines at the operating frequency, but there exists loss to some extent at harmonic frequencies. This leads to the more excellent inherent capability of harmonic rejection of the size-reduced amplifier. Therefore, it is expected tile harmonics of the size-reduced amplifier are smaller than those of the original amplifier. The measured second harmonic, third order intermodulation distortion (IMD3), and adjacent channel power ratio (ACPR) of the size-reduced amplifier are smaller than those of the original amplifier by 5 dB, 2~6 dB, and 1~4 dB, respectively, as expectation.
2 GHz Down Conversion MMIC Mixer using SiGe HBT Foundry
S.-M. Heo ; J.-H. Joo ; S.-Y. Ryu ; J.-S. Choi ; Y.-H. Nho ; B.-S. Kim ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 764~768
In this paper, a double balanced gilbert cell MMIC mixer was realized in Tachyonics SiGe HBT technology. The fabricated mixer has 17 dB conversion gain, 9.8 dB noise figure, -4.2 dBm output 1 dB compression point, -27 dBc RF to IF isolation, and the good input, output matching characteristics. It draws 10 mA from a 3 V supply. The simulation and the measured results are closer to each other, which confirms accuracy of the model library and reliability of the process.
Uniform Slot Width Bow-tie-shaped Meander Slot Antenna for 5 GHz Application
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 769~776
In this paper, we propose uniform slot width bow-tie-shaped meander slot antenna for 5 GHz application. The conventional bow-tie slot antenna has broadband characteristic, however, its size is large. Meanwhile, the meander slot antenna has small size, but it has quite narrow bandwidth. The proposed antenna geometry is a variation of the meander slot antenna incorporating bow-tie shape to realize miniaturized antenna having relatively large bandwidth. Simulated results show that with the same slot width and total slot length, the bandwidth of the proposed antenna is 3 times wider than that of meander slot antenna, and its resonant frequency is 3.01 GHz lower than that of the equal size(H x V) bow-tie slot antenna, and measured results show that the bandwidth of proposed antenna is 218 MHz(5.142 GHz ~ 5.360 GHz) which satisfy the required bandwidth from 5.15 GHz to 5.35 GHz.
Wide-Angle Radar Target Classification with Subclass Concept
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 777~782
The range profile is easily obtainable and promising feature vector in the aspect of real-time radar target recognition system. However, the range profile is highly dependent on a aspect angle of a target and this dependence make it difficult the recognition over wide-angular region. In this paper, we propose the classifier with subclass concept in order to solve this dependence problem. Recognition results using six aircraft models measured at compact range facility are presented to show the effectiveness of this proposed classifier over wide-angular region.
Spatially Combined V-Band MMIC Coupled Oscillator Array in Waveguide
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 783~789
In this paper, V-band MMIC coupled oscillator arrays are presented. In the proposed array, two push-pull patch antennas are synchronized by using strong electromagnetic coupling between two antennas. As a result, total size of the array is reduced and the array can be integrated in a single chip. To verify proposed array concept, two 1
2 arrays are designed and fabricated using standard 0.15 um gate length pHEMT MMIC process. The circuits are mounted in an oversized waveguide and measured. The first array shows 0.5 dBm at 56.372 GHz and the second one has an output of 5.85 dBm at 60.147 GHz.
A Feasibility Study on a Subsurface-Penetrating Radar for Nondestructive Testing of Wooden Architectures : FDTD Simulation and Laboratory Measurement
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 790~796
In our country, historically beautiful and significant wooden architectures are preserved as the cultural properties. For a long time, however, the architectures are often exposed to rough environmental conditions, such as weathering, insect attack, etc. This may lead to deterioration of structural integrity of the architectures. Therefore, it is necessary to diagnose wooden architectures in advance. In this paper, the possibility of a subsurface-penetrating radar(SPR) fur non-destructive testing(NDT) of wooden architectures is investigated by using the three-dimensional finite-difference time-domain(FDTD) simulation and actual laboratory measurement.
On the Distribution of Phase Error in the Rician Fading Channel
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 797~803
In this paper we derive the probability density function of the phase error of the received signal over Rician fading channel and verify its propriety as the probability density function using the zeroth moment. In general, for the error probability over fading channel we compute the error probability in the first place when it is only AWGN, and then we get the final result by averaging the first result and the probability density function of the corresponding fading channel. In this paper, however, we compute the error probability by double integration after the probability density function over fading channel is computed.
Optimized Cell ID Codes for SSDT Power Control in W-CDMA System
Young-Joon Song ; Bong-Hoe Kim ; Hae Chung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 804~810
The code division multiple access(CDMA) system capacity is limited by the amount of interference of the system. To reduce the unnecessary interference, this paper proposes optimized cell identification codes for site selection diversity transmission(SSDT) power control in wideband code division multiple access system of third generation partnership project(3GPP). The main objective of SSDT power control is to transmit on the downlink from the primary cell, and thus reducing the interference caused by the multiple transmission. In order to select a primary cell, each cell is assigned a temporary identification(ID) and user equipment(UE) periodically informs a primary cell ID to the connecting cells during soft handover. The non-primary cells selected by UE do not transmit the dedicated physical data channel(DPDCH) to reduce the interference. A major issue with the SSDT technology is the impact of uplink symbol errors on its performance. These errors can corrupt the primary ID code and this may lead to wrong decoding in the base station receivers. The proposed SSDT cell ID codes are designed to minimize the problem and to be easily decoded using simple fast Hadamard transformation(FHT) decoder.
A Study on a Shorting Pin and Slot-Loaded Antenna for Harmonic Suppression
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 811~818
In this paper, a shorting pin and slot-loaded microstrip patch antenna is designed and fabricated. A shorting pin and slots are used for harmonic suppression on an inset fed antenna. A shorting pin and slot properties are analyzed by cavity model of the rectangular patch and the characteristics of the designed antenna are described. The designed antenna provides a gain of 7 dBi at the fundamental frequency, 5.8 GHz. In the second and third harmonic frequencies, the proposed antenna has gain suppression properties of -3.3 dB and -14.3 dB at each harmonic frequency, respectively.
Tunable Band-pass Filters using Ba
Thin Films for Wireless LAN Application
Kim, Ki-Byoung ; Yun, Tae-Soon ; Lee, Jong-Chul ; Kim, Il-Doo ; Lim, Mi-Hwa ; Kim, Ho-Gi ; Kim, Jong-Heon ; Lee, Byungje ; Kim, Na-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 819~826
In this paper, the performance of Au /
(BST) / Magnesium oxide (MgO) two-layered electrically tunable band-pass Filters (BPFs) is demonstrated. The devices consist of microstrip, coplanar waveguide (CPW), and conductor-backed coplanar waveguide (CBCPW) structures. These BST thin film band-pass filters have been designed by the 2.5 D field simulator, IE3D, Zeland Inc., and fabricated by thin film process. The simulation results, using the 2-pole microstrip, CPW, and CBCPW band-pass filters, show the center frequencies of 5.89 GHz, 5.88 GHz, and 5.69 GHz, and the corresponding insertion losses are 2.67 dB, 1.14 dB, and 1.60 dB, with 3 %, 9 %, and 7 % bandwidth, respectively. The measurement results show the center frequencies of 6.4 GHz, 6.14 GHz, and 6.04 GHz, and their corresponding insertion losses are 6 dB, 4.41 dB, and 5.41 dB, respectively, without any bias voltage. With the bias voltage of 40 V, the center frequencies for the band-pass filters are measured to be 6.61 GHz, 6.31 GHz, and 6.21 GHz, and their insertion losses are observed to be 7.33 dB, 5.83 dB, and 6.83 dB, respectively. From the experiment, the tuning range for the band-pass filters are determined as about 3 % ~ 8 %.
A Study on Microstrip Array Antenna for LMDS Receiver with Corporate Feeding Network using Chebyshev Polynomials
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 827~833
In this paper, a microstrip array antenna for LMDS(Local Multipoint Distribution Service) receiver with corporate feeding network using Chebyshev polynomials is proposed to get the high gain and low side lobe level. The Chebyshev array method is proposed to design the corporate feeding network. LMDS uses 24~27 GHz microwave frequency band to send and receive broadband signals. Measured antenna shows 23.4 dBi gain, 24.96 GHz center frequency, -29.15 dB return loss and 1.2 GHz bandwidth.
Analysis of Electromagnetic Scattering from an Arbitrarily-Shaped Conductor using Duffy한s Method
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 834~842
The method of moment is applied to the analysis of electromagnetic scattering from an arbitrarily-shaped conductor. The conducting surface is discretized into triangular patches using a GID tool. Surface currents on a conductor are expanded with a vector triangle basis function. By using the Duffy's method, the singular integration appeared in a triangle patch can be transformed into the non-singular integral form suitable for one dimensional Gaussian quadrature integration method. Mutual and self integration extracted singular terms are evaluated by two dimensional Gaussian quadrature techniques.
Correlation of OATS Emission Data and Free Space Emission Data
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 8, 2002, Pages 843~849
This study is based on the recent CISPR research which is focused on correlation of OATS and FAR. First, we calculate the correlaton factor about OATS and FAR. We measured the field strengths at the OATS and in the FAR both for 3 m distances to obtain the experimental correlation factors. We programmed correlation factor that calculated from theoretical models. The Results showed the measured correlation factor in 6 dB from 30 to 1,000 MHz. It will be use to substitute FAR for OATS about efficient to measure EMI(Electro Magnetic Interference).