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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 11, Issue 8 - Dec 2000
Volume 11, Issue 7 - Oct 2000
Volume 11, Issue 6 - Sep 2000
Volume 11, Issue 5 - Aug 2000
Volume 11, Issue 4 - Jun 2000
Volume 11, Issue 3 - Apr 2000
Volume 11, Issue 2 - Feb 2000
Volume 11, Issue 1 - Jan 2000
Selecting the target year
The EMI Suppression Technology for Radiated Emissions from PCB Traces
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1121~1127
Among many EMI suppression techniques for radiated emissions from PCB traces, image technique is adapted in this paper. A model for the analysis of the effect of image plane on the radiation of a microstrip trace is presented. After a simulation was carried out by using the FEM(Finite Element Method), field strength was measured with electric probe. The radiated emission levels were measured for various image plane width, separation distances, and their results show that the measured data are very close to those of simulation result. It proves that a proper use of image planes on the PCBs is very effective means of reducing EMI emissions on the PCBs.
Performance Evaluation of Channel Estimation Algorithm for Pilot Symbol-Assisted IMT-2000 System over Multipath Rayleigh Fading Channel
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1128~1138
This paper presents two different approaches for channel estimation of IMT-2000 pilot symbol-assisted W-CDMA reverse link over Rayleigh fading channels of one and two paths. By obtaining BER performance through computer simulations, the proposed algorithms of 2-point second-order interpolation and IDD BWMA are compared with the performance of existing interpolation and adaptive algorithms. The BER performance of the proposed algorithms is superior to WMSA, linear and second-order Gaussian interpolation, LMS, and RLS algorithm in fast fading channels. In particular, the BER performance of the IDD BWMA algorithm is nearly insensitive for Doppler frequency within simulation range
= 28 dB. The two proposed algorithms also have relatively simple structure and similar processing delay in comparison to the existing algorithms. Therefore, these algorithms are more suitable for high-speed mobile communication environments.
Circular-Polarized Dipole Antenna with Reflector
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1139~1146
In this paper, circular-polarized dipole antenna with a novel structure is designed, simulated and fabricated for PCS or IMT-2000 base station at an arbitrary test frequency(1.575 GHz). Its radiation pattern is analyzed by means of physical optics(PO). The designed antenna is made up of a horizontal and a vertical dipole elements at a height of λ/4 above an reflector. One of λ/4 length vertical dipole element is located at a height of λ/8 above an reflector. In this case, circularly polarized radiation pattern is obtained by making impedance difference due to adjusting the length of each element. The characteristic of antenna measured from this study is that return loss is 18.4 dB, -10 dB bandwidth is 360 MHz(22.8%), 2 dB axial ratio bandwidth is 30 MHz, -3 dB beamwidth is 76
, 2 dB axial ratio beamwidth is 58
, axial ratio is 1.7 dB at 1.575 GHz. Radiation pattern is in well agreement with the result of PO
The Study of Interference Cancellation between DSRC and ETC with Adaptive Array Antenna
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1147~1155
The installation of wireless communication system for various services of ITS at 5.8 GHz generates mutual interference. The representative example, the sharing of frequency between DSRC system and ETC system is a cause of communication error or disturbance both sides or one side owing to mutual interference. As a solution, a Shield Plate, Antenna Directionality, Power Control is proposed, but these are not perfect solution, because a RSU doesn't have the information of position of interferer. This paper applies an adaptive array antenna which makes a gain for desired users, makes a null for interferer, to up-link, down-link of DSRC and ETC system. The analysis of BER performance shows the effect of reduced interference about 20 dB.
A RX Cancellation Loop Configyration for TX Power Amplifier Module
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1156~1160
The cancellation loop configuration for power amplifier module is proposed to reject the RX signals using feed-forward technique. In this paper, we implement the 1W-ampilfier module of WLL band to show validity of the proposed cancellation loop. The power amplifier module with the proposed cancellation loop can provide low TX insertion path loss due to duplexer and choice of loose RX attenuation characteristic for various wireless communication systems. It shows at least 90 % improved RX rejection characteristic compared to power amplifier module without RX band cancellation loop.
Comparison of FDTD Computed and Measured SAR of Hand-Held Mobile phone
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1161~1167
Analysis of Propagation Characteristics of Microstrip Lines with a Composite YIG Film-GGG Structure
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1168~1175
To observe propagation characteristics of microstrip lines on YIG film, the FDTD is employed. For various GGG substrate and YIG film, the dispersion curves and the bandwidth of the cutoff region are calculated. And the distribution of the electric fields of the transverse plane underneath the conductor strip is obtained near upper and lower cutoff frequency. The results of two and three dimensional FDTD for the upper cutoff frequency are compared with spectral domain approach(SDA). A good agreement is verified, although there is relative error 6% between the results calculated by the two methods.
New Analysis on Reception of M-ary FSK Signals over Rician Fading Channels
Kim, Chang-Hwan ; Han, Young-Yearl ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1176~1185
In this paper, we analyze the distribution of the envelope of the received signal over frequency-nonselective slow Rician fading channels with aadditive white Gaussian noise(AWGN). Especially, we can obtain the error rate performance of noncoherent M-ary FSK(MFSK) over slow and flat Rician fading channels and AWGN from the new probability density function(PDF) of the envelope, not PDF of the instantaneous signal-to-noise ratio(SNR) published before, of the received signal. When coherent MFSK signals experience the Rician fading channel, the performances are derived, using the union bound.
Performance Analysis of the FH/MFSK System using the Selection Diversity in Nakagami Fading Channel
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1186~1193
In this paper, the system performance with the selection diversity, which is applied to the FH/MFSK system in Nakagami fading channel, is analyzed. The deletion probability is derived from the received signal to noise ratio(SNR) after selection combining and the parameters such as the number of users(M), SNR, Nakagami fading figure(m), and the number of diversity branches(D) is used for the performance analysis of the FH/MFSK system. Assuming that m set 1, it is observed that the bit error rate(BER) is 1.0
at D =1(no diversity) and D=2, respectively, and then is decreased by 10 times. Assuming that m set 2, it is also shown that the BER has a constant value although D is increased. In the case of D=2, the system capacity is more 75% and 20% than that considering no diversity at SNR=15 dB and 25 dB, respectively.
Sptimum Design of a Uniform Magnetic Field Exposure System for a Small-Sized Animal Study
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1194~1203
A magnetic field exposure system that generates 60 Hz magnetic fields from 1 mG to 5 G was designed and constructed for small-sized animal study. In order to investigate as many animals as possible at one series of test, uniform magnetic fields are required at wide living area of the animals. In this article, a cubic shaped field exposure system with three animal living floors was designed, which offers about 50 seating capacity. For calculation of magnetic fields inside the cage, a three-dimensional calculation program was developed. Using this, optimum electric current ratio of inner coil to outer coil and position of each coil were determined. Meanwhile, inductance of the exposure system was calculated for the design of power supply. The field measurement results of the manufactured exposure system showed that the difference between maximum and minimum magnetic field at the testing floors was less than 3%, which strongly demonstrated the field exposure system was good for small sized animal study.
Analysis of Electromagnetic Pulse Coupling Via a Slot Aperture into Parallel-Plate waveguide
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1204~1210
An analysis method for obtaining transient response of electromagnetic pulse(EMP) coupled via a slot aperture into a parallel-plate waveguide, is considered. The mixed-potential integral equation(MPIE), in which the vector and scalar potential Green's functions for the unknown equivalent magnetic surface current of the aperture in parallel-plate region are expressed in closed forms derived by use of the improved complex image method, is formulated. When the method of moments(MoM) is used to solve the MPIE, the matrix-fill time is significantly reduced because of closed-form Green's functions. In order to check the validity of the present method, the numerical results obtained by the present method are compared with those obtained by the previous method. Fairly good agreements between them are observed.
Analysis of Coplaner
Waveguide Structures Applicable Electrooptic Modulator with FDTD method
Lee, Byung-Je ; Byun, Joon-Ho ; Kim, Nam-Young ; Kim, Jong-Heon ; Lee, Jong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1211~1217
The three-dimensional finite-difference time-domain (FDTD) method and the two-dimensional quasi-static formulation have been used to calculate the characteristic impedance and the microwave effective index of coplanar waveguide structures on Lithium Niobate (
) single crystal substrates with a yttria-stabilized zirconia (YSZ) or
buffer layer. The results shown can be a good source to predict the modulator characteristics. The effects of the thin buffer layer and anisotropy of the
crystal (x-cut and z-cut) are discussed. The comparison between the FDTD and quasi-static results shows good agreement. In this paper, the efficient modeling technique of the FDTD method for the coplanar waveguide (CPW) structures based on an anisotropic substrate with a thin buffer layer is developed.
Design of a KaBand Half-Height Waveguide Power Combiner
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1218~1224
A half-height waveguide power combiner is designed and analyzed for Ka-band satellite application. The branch line directional coupler is utilized as a power combiner to achieve high port-to-port isolation and low insertion loss. The half height waveguide is adopted to reduce the volume and mass of a power combiner. In this paper a half height waveguide power combiner is designed and analyzed by FDTD and its performance is compared with that of a full-height waveguide power combiner. The designed half-height combiner having optimum order is manufactured and tested. The measurement shows that the designed half-height power combiner satisfies all the performance requirements (insertion loss less than 0.3 dB, reflection loss more than 20dB, port to port isolation more than 20 dB, and port to port phase difference within 5
) in the satellite communication frequency band of 20.255 GHz to 21.255 GHz.
A Study on Whispering Gallery Mode Dielectric Coupled Resonator which Englarges the Free Spectral Tange
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1225~1232
In this paper, a new coupled resonator which expands free spectral ranges (FSR) of the W. G. mode resonators is presented. The proposed coupled resonator consists of two dielectric disks. The resonance frequency of the coupled resonator is equivalent to the frequency, which satisfies the individual resonance conditions of each disk at the same time. As the results, the FSR is expanded. The coupled resonator proposed in this paper at K-Band is fabricated by using dielectric disks and the dielectric straight waveguides. The validity of proposed coupled resonator was verified through experiments.
An Effective x-dB Bandwidth Measurement Method of FM Signals using moving Average
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1233~1239
In this paper, a new approach is proposed for effectively estimating the occupied bandwidth of frequency modulation (FM) signals. The proposed method makes use of the smoothing niter for removing the perturbation of spectrum envelope, which frequently occurs in FM signals having the instantaneous frequency. An effective procedure is derived for finding the relatively accurate bandwidth of FM signals combined with x-dB bandwidth measurement method, which International Telecommunication Union-Radiocommunication (ITU-R) recommended. It was shown that the proposed approach provides superior performance relative to the one obtained with the x-dB bandwidth measurement method in terms of sample bias and mean squared error of bandwidth estimates.
Finite-Difference Time-Domain Approach for the development of an Equivalent Circuit for a Single Step Microstrip Discontinuity in the Substrate
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1240~1246
The finite-difference time-domain (FDTD) method is applied to analyze a single step microstrip discontinuity in the substrate, and an equivalent circuit model comprised of two inductors and a capacitor has been developed using the numerical results. The microstrip discontinuity newly introduced in this paper has a thickness change of the substrate in the longitudinal direction with a uniform strip width. The discontinuity can be applied to the feeding circuit design for the patch antennas and interconnections between microwave circuit modules. The simulation results are compared with those computed by HFSS, and two results showed a good agreement. An equivalent circuit developed from the FDTD results, which is accurate within 2.4% in magnitudes of
,can be applied for the computer-aided design of microwave circuits.
The Analysis of Dual Beam Offser-fed Dish Antenna
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1247~1257
Offset-fed dish antennas are considered. Offset-fed dish antennas are widely used for DBS reception, the problem of offset-fed dish antenna has, however, received little attention because of its complicated and asymmetric geometry. A Fourier-transform technique and Physical Optics are employed to express the fields radiated from offset-fed reflector and feed horn aperture. The simultaneous equations are solved to obtain a solution in a fast convergent series, thus facilitating the numerical computation. For given parameters such as diameter of reflector, focal length, offset height of reflector center, exact solutions are derived. Since offset-fed dish antenna has an application as multi-beam antenna using multiple feed, a brief feasablity of dual beam antenna for Korea-SAT (116
E, EIRP 59 dBW) and Orion-SAT (139
E, EIRP 54 dBW) is given in Conclusion.
Performance Characteristics of the High Resolution, X-band Small Stellite SAR System Design
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1258~1270
A synthetic aperture radar (SAR) system is able to provide all-weather, day-and-night, high resolution imaging capability in the wide area of interest, and thus is extremely useful in surveillance for both civil and military applications. In this paper, the X-band high-resolution spaceborne SAR system design is described with the key design parameters for the mission and system requirement characterized by the small satellite platform. The SAR imaging mode design technique is presented, and the standard imaging mode design results are analyzed with respect to image quality performance. In line with the system requirement, X-band SAR payload and ground reception/processing subsystems are designed and the key design results are demonstrated with the outstanding performance characteristics. The designed small satellite SAR system shows the wide range of imaging capability, and proves to be an effective surveillance systems in the light weight, high performance and cost-effective points of view.
calculation of the Performance about a Junction of Rectangular Waveguide to Coaxial Line with an Skewed Conducting Post
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1271~1281
Design of Sequentially-Rotated Array Antenna with Triangular Lattice
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 11, issue 7, 2000, Pages 1282~1290
The LHCP circularly polarized antenna operating at the satellite broadcast receiving band is developed by employing the sequential-rotation technique in which each truncated-corner patch square element is arranged in the triangular lattice type. Antenna designed with sequentially rotated technique of triangular lattice type has the effect of improved axial-ratio bandwidth, cross-polarization etc., and the degradation of radiation pattern can be reduced significantly by minimizing the radiation loss of feeding line structure. Characteristics of antenna designed is satisfied with specifications of array antenna for DBS that is -27 dB of side lobe level and -20 dB of cross-polarized level at