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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 7, Issue 5 - Dec 1996
Volume 7, Issue 4 - Oct 1996
Volume 7, Issue 3 - Aug 1996
Volume 7, Issue 2 - Jun 1996
Volume 7, Issue 1 - Mar 1996
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A Study on the Bandpass Filter Using S-plane Prototype in UHF
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 369~375
This paper described the miniaturization of microstrip bandpss filter in UHF using S-plane Prototype. Modern microwave receiver system requires smaller size and better filter performance. The design of filters using bandpass S-plane prototype is made to satisfy these requirements. Bandpass S-plane prototypes are made by exact-synthesis technique using transmission zero locations at wanted frequency bandwidth, and the calculation of prototype values was performed by computer.
A Study on Phenomena of Sea Propagation Considering Surface Wave
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 376~383
In general, the electromagnetic field analysis of a vertical dipole mainly deals with the space. wave. But when only the space wave is considered, as a receiving point is close to the surface of medium, the receiving electric field strength is rapidly decreased. In this paper, to solve this problem, we considered both the surface wave and the space wave contribution. When the vector potential is used with the angular spectrum transformation method, the space wave and the surface wave are included in the final electric field expression. By using this final electric field expression, the effect of the surface wave is analyzed through simulations and the factors having effect on a propagation phenomenon of sea surface are studied in detail. Also, the justification of the theoretical formula was proved by comparing theoretical values with measuring ones at 880. 2MHz which is the frequency of mobile communication.
Propagation Characteristic Analysis of Square and Gaussian Pulse Signals on the Microstrip Line
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 384~394
The propagation properties of square and Gaussian pulse signals on the microstrip line are investigated by using proper conventional models to meet the frequency range of a pulse, accuracy, and geometrical requirements of the microstrip line. Numerical integration technique which has its accuracy and is easily simulated, is used to obtain the time domain response of pulse signals. The dispersion of pulse signals is analyzed regarding to the relative permittivity
, substrate height h, strip width w of the microstrip line and pulse width
of signal pulse. The simulation results show that small relative permittivity and small rationale of w/h are advantageous for the dispersion of the pulse signals, and that pulse signals with small bandwidth cause smaller dispersion. The results of this paper are compatible to the trade-off determination of relative permittivity, substrate height, strip width and pulse width of signal pulse when a design of MIC and MMIC is necessary.
A Study on the Interconnection Parameter Extraction Method in the Radio Frequency Circuits
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 395~407
In this paper, we describe the crossover of the parasitic capacitance at the interconnections for the system miniature, analyse ground capacitance and mutual capacitance due to actually coupled line in the ICs or MCMs. From the results of deviding interconnection line with infinite parts, using Green's function with image charge method and moments, we could obtain 70% decrease of system runtime parasitic inductance because of simplicity of transforming formular.
Performance Analysis of Broadband Spread Spectrum Method Against Multipath Fading
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 408~417
In this paper, we quantiatively analyze the broadband CDMA systems with high chip rate, which virually eliminates the multipath fading effects by distinguishing each reflected paths in the process of despreading. We model the broadband multipath propagation channel with random time-variant impulse response as a linear filter of tapped delay line to evaluate the performance of broadband CDMA systems in multipath fading environment. This statistical model, based on extensive experimental data, was established to characterize the urban radio propagation medium in various environments. We perform computer simulation of the transmission and reception of broadband CDMA systems by applying it to abve channel model. From the simulation results, we confirm that the broadband CDMA systems inherenly reduce the effects of multipath fading phenomena which causes to degrade the performance of mobile communication systems, based on the results of eye-diagram and BER curve.
Performance Analysis of Multitone FH/MFSK System with Stage Address Coding in Subband and Nonsegmented Frequency Band
Moon-Seung Lee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 418~429
The number of bits per message and the number of tones in the frequency-hopping sequence are determined by the available bandwidth and the data rate of each user. These parameters in turn determine the tone duration which strongly influences the vulnerability of the system to transmission distortions. In this paper, an address code which is assigned to each individual user was employed in order to reduce the collisions or hit. Also the frequency band is divided into several subbands and each user transmits multitone frequency per subband per chip. And the new system which is to increase the duration of each tone by increasing the total number of system frequencies that has been proposed. It is found that an optimum value bit, tone, number of frequencies per chirp can improve the err performance. This flexibility slightly increases maximum efficiecy and makes the the system less vulnerable to multipath delay. So, It is found that as the nuber of user increased 50%, the efficiency as a tuncion of the bandwidth to user'rate ratio improve 20%.
Analysis of Crosstalk between PCB Traces in Frequency and Time Domain
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 430~439
In printed circuit board (PCB) design, it is necessary to predict the crosstalk effect among traces on the circuitary behavior. In this paper, crosstalk between parallel or crossing traces was treated by the finite difference time domain (FDTD) method. They are the typical models of PCB traces and the crosstalk is a major contributor in the creation of electromagnetic interference (EMI). The crosstalk effect was computed for the variation of distance spacing and length of parallel traces and crossing traces. The results in time and frequency domain are discussed and compared with those using MDS(microwave design system) and HFSS(high frequency structure simulator). The comparison shows that the FDTD method can be of wide application in analysis model and save the time required for calculation.
TM and TE Modes in Multiple-Ridged Circular Waveguides
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 7, issue 5, 1996, Pages 440~446
The multiple-ridged circular waveguides is analyzed using Fourier series and the mode matching technique. The enforcement of the boundary conditions yields the simultaneous equations for the field coefficient inside the waveguides. The simultaneous equations are solved to represent a dispersion relation in an analytic series form. The numerical computation is performed to illustrate the behavior of the cutoff wavenumbers in terms of number, length and angle of ridges. The presented series solution is exact and rapidly-convergent so that it is efficient for numerical computation. A simple dispersion relation based on the dominant mode analysis is obtained and is shown to be very accurate for most practical applications.