Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of Korean Institute of Electromagnetic Engineering and Science
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
Editor in Chief :
Volume & Issues
Volume 17, Issue 12 - Dec 2006
Volume 17, Issue 11 - Nov 2006
Volume 17, Issue 10 - Oct 2006
Volume 17, Issue 9 - Sep 2006
Volume 17, Issue 8 - Aug 2006
Volume 17, Issue 7 - Jul 2006
Volume 17, Issue 6 - Jun 2006
Volume 17, Issue 5 - May 2006
Volume 17, Issue 4 - Apr 2006
Volume 17, Issue 3 - Mar 2006
Volume 17, Issue 2 - Feb 2006
Volume 17, Issue 1 - Jan 2006
Selecting the target year
The Improvement of Motion Compensation for a Moving Target Using the Gabor Wavelet Transform
Shin, Seung-Yong ; Myung, Noh-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 913~919
This paper presents a technique for motion compensation of ISAR(Inverse SAR) images for a moving target. If a simple fourier transform is employed to obtain ISAR image for a moving target, the image is usually blurred. These images blurring problem can be solved with the time-frequency transform. In this paper, motion compensation algorithms of ISAR image such as STFT(Short Time Fourier Transform), GWT(Gabor Wavelet Transform) are described. In order to show the performances of each algorithm, we use scattering wave of the ideal point scatterers and simulated MIG-25 to obtain motion compensated ISAR image, and display the resolution of STFT and GWT ISAR image.
A Novel Frequency Selective Surface: Frequency Selective Fabric Composite
Lee, Sang-Eui ; Kim, Chun-Gon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 920~928
Fiber-reinforced composites transmitting microwaves of certain frequencies or bands were proposed. These frequency selective fabric composites(FSFCs) are fabricated by weaving carbon fibers and dielectric fibers that build periodic patterns. Design parameters affecting the electromagnetic characteristics of FSFCs were widely discussed, Then the electromagnetic characteristics of a fabricated plain-weave FSEC were investigated with regard to the electrical conductivities of carbon roving, the fiber undulation, and the aperture-to-cell ratio, for the electrical conductivities, its dependence on frequency as well as on the fiber volume fraction of carbon roving was taken into account. Constituent material properties and the fiber undulation had little effect on the EM properties of the fabricated FSFC, while the aperture-to-cell ratio made a profound effect on them.
Design of Miniaturized Microwave Amplifier Using Capacitively-Coupled Match Circuit(CCMC) under Conditionally Stable State
Ryu, Seung-Kab ; Hwang, In-Ho ; Kim, Yong-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 929~934
In the paper, we suggest a simpler synthesis technique for capacitively-coupled match circuit(CCMC) which have a function of DC block and impedance matching simultaneously, and introduce a stability margin analysis technique for designing microwave amplifier under conditionally stable state. Stability margin analysis is used to determine optimum match point that ensure maximum gain under the given stability margin. It can reduce time consuming work for selecting match points in the conditionally stable state. Also, suggested miniaturization scheme of matching network is distinguished from previous work with respect to reducing deterministic parameters for CCMC synthesis. To verify utility of suggested method, 24 GHz gain block is fabricated under conditionally stable state using an internal thin-film fabrication process, Measured results show a stable gain of 10 dB and flatness of 1 dB, which is well coincident with simulated one.
The Realization of Series Capacitor Using Broadside Coupled Suspended Substrate Stripline(BCSSS)
Kim, In-Seon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 935~942
In this paper, a novel theory of realizing the series capacitor with broadside coupled suspended substrate stripline (BCSSS) is proposed. The proposed theory is relatively simple because the method of odd mode analysis is only applied: However, this theory supplies reliable result by considering the line effective width and end effect caused by the fringing field. The simulation results are presented to compare and analyze the characteristics of the ideal lumped capacitor and the coupled line capacitor. Also, the capacitive gap coupled line band-pass filter based on the proposed theory are designed and fabricated. The results prove successfully the validity of the proposed theory.
Performance Analysis of IMD-Reduction-based Tone Reservation Method for the Protection of Nonlinear Distortion in the OFDM Communication System
Byeon, Heui-Seop ; Kim, Nam-Il ; Kim, Young-Hoon ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 943~952
The OFDM system is very good for the high data rate communication system. However, OFDM system has a high PAPR problem. This makes the OFDM signal distorted through the nonlinear HPA(High Power Amplifier). To solve this problem, generally, simple PAPR reduction methods have been considered. However, in this paper, we introduce IMD reduction method instead of PAPR. PAPR is the signal property and the IMD is signal component of the HPA output, which degrades the communication quality. So, instead of PAPR we want to use the IMD reduction method. This is to transmit a signal with the smallest distortion by considering the third order nonlinearity when the data is recovered. We use the TR method that was proposed for the PAPR reduction and we find out the BER performance of two methods. As results, we show that the IMD reduction method improves better BER performance than the PAPR reduction.
Design of a Compact Wilkinson Power Divider Using Meta-Material Lines
Kim, Jeong-Pyo ; Kim, Gi-Ho ; Yang, Myo-Geun ; Seong, Won-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 953~958
A compact Wilkinson power divider with meta-material transmission line(MM-TL) is proposed. The divider is designed by adding the MM-TL with
phases shifting instead of the
phases shifting at a simple Wilkinson power divider. The MM-TL consists of three phase shifter unit cells and each cell has the characteristics of the
phases shilling and 6 mm length. Therefore, the length of
phases shifting at a simple Wilkinson power divider can be reduced to 18 mm and the Wilkinson divider is very compact.
Dual-band Predistortion Linear Power Amplifier for Base-station Application
Choi, Heung-Jae ; Jeong, Yong-Chae ; Kim, Chul-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 959~966
This paper proposes a new concept about dual band predistortion linear power amplifier(PD LPA) using diplexer for digital cellular (
=880 MHz) and IMT-2000(
=2,140 MHz) base stations. The diplexer is composed of low pass filter having defected ground structure(BGS) microstrip line and high pass filter having high-Q lumped capacitors and distributed elements. The proposed predistorter adopts a reflection type intermodulation signal generator with 3 dB hybrid coupler for good reflection characteristic. for a forward link one carrier CDMA IS-95A 1FA and WCDMA 1FA signal, the proposed dual band PD LPA shows the adjacent channel leakage ratio(ACLR) improvement about 10 dB and 9.36 dB for digital cellular and IMT-2000 band, respectively.
Millimeter-wave LTCC Front-end Module for Highly Integrated Transceiver
Kim, Bong-Su ; Byun, Woo-Jin ; Kim, Kwang-Seon ; Eun, Ki-Chan ; Song, Myung-Sun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 967~975
In this paper, design and implementation of a very compact and cost effective front-end module are presented for IEEE 802.16 FWA(fixed Wireless Access) in the 40 GHz band. A multi-layer LTCC(Low Temperature Co-fred Ceramic) technology with cavity process to achieve excellent electrical performances is used to fabricate the front-end module. The wirebond matching circuit design of switch input/output port and waveguide transition to connect antenna are optimally designed to keep transmission loss low. To reduce the size of the front-end module, the dielectric waveguide filter is developed instead of the metal waveguide filter. The LTCC is composed of 6 layers(with the thickness of a layer of 100 um) having a relative dielectric constant of 7.1. The front-end module is implemented in a volume of
and shows an overall insertion loss < 5.3 dB, and image rejection value > 49 dB.
PAPR Reduction and BER Analysis of the OFDM System Using the TR and DCT Transform
Byeon, Heui-Seop ; Shinn, Byung-Cheol ; Ahn, Do-Seob ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 976~984
OFDM system is very useful for the high speed communication system. However, OFDM system has a serious problem of high PAPR that results from the so many subcarriers in the same phase. This OFDM signal is distorted through the nonlinear HPA(High Power Amplifier). Tone reservation method is to insert tone signal in several types to reduce the PAPR after iterating this process by changing the tone signal. Also discrete cosine transform(DCT) can reduces the PAPR as multiplying the cosine value to change the angle and mix up with the data. In the paper, the combination of the TR method and DCT method is newly proposed for more effective reduction of the PAPR. Simulation results show that the proposed method outperforms the conventional simple TR method and DCT method with respect to the PAPR reduction and BER performance.
A Study on Distributed Power Control for Energy Efficiency in Multicast Routing
Chung, Hyun-Gi ; Yang, Seung-In ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 985~992
The classic routing algorithms try to minimize the number of hops to reach a destination. In our DPC(Distributed Power Control) this hop-by-hop power level selection is also used to select the path guaranteeing low energy consumption. The main goal is to realize a dynamic protocol able to be aware of mobility and to automatically set security threshold in order to get the best performance in every situation. In conclusion, the simulation DPC has improved energy gain of the AMRIS routing algorithm at the narrow area, and ODMRP routing algorithm has improved energy gain at the wide area.
Design of Dual-band Stacked Meander Line Antenna with Double Coupled Line
Jung, Jin-Woo ; Seo, In-Jong ; Lee, Hyeon-Jin ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 993~999
This paper presents the design simulation, implementation, and measurement of a miniaturized DCS, PCS / Satellite DMB dual-band stacked chip antenna with double coupled line for mobile communication terminals. A stacked meander is realized by using a via hole with height of 0.8 mm and a diameter of 0.35 mm to connect upper- and lower-layer meander sections for a reduction of the dimensions of the antenna. In addition the stacked meander chip antenna is extended by a double coupled-line to achieve two different radiation modes. A ratio of the first frequency and second frequency vary with the geometrical parameter of coupled lines. The fabricated antenna used FR-4 substrate with relative permittivity of 4.2. And its dimensions are
. The measured impedance bandwidth(VSRW<2) are 244 and 120 MHz at the operating frequency, respectively.
Gain Enhancement of a Horn Antenna with Latticed Aperture
Hur, Moon-Man ; Lee, In-Jae ; Lim, Gye-Jae ; Yoon, Hyun-Bo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 1000~1006
In this paper, the gain of the square hem antenna is enhanced with
latticed aperture. In order to get the uniform field distribution on the aperture, the different thicknesses of dielectric plates for the phase compensation are inserted into the center and the edge of the aperture respectively. The proposed horn antenna is designed at 12.5 GHz band, and then the analysis of the field distribution on the aperture is performed by using FDTD method. The radiation pattern is also calculated from the analysis. Based on the measured data, it is verified that the gain of a horn antenna with latticed aperture is 18 dBi and this is 2 dB gain enhancement compare with a normal horn antenna without latticed aperture.
A Multibeam Pattern Synthesis of Planar Array Antenna
Hur, Moon-Man ; Lee, In-Jae ; Yoon, Hyun-Bo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 17, issue 10, 2006, Pages 1007~1019
In this paper, the synthesis method of multibeam radiation pattern with multi-directional beams and nulls is proposed. Genetic algorithm is applied for the optimization of amplitude and phase of the feeding signal into each element that is structured in planar array of single patch antenna with an arbitrary field distribution. To verify the validity of the proposed method,
planar array antenna is used for the measurement and the measured far field radiation pattern is compared with the simulation result. As a result, the synthesis of multibeam radiation pattern is implemented by the optimization of amplitude and phase of the feeding signal into each element of
planar array antenna system.