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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 14, Issue 12 - Dec 2003
Volume 14, Issue 11 - Nov 2003
Volume 14, Issue 10 - Oct 2003
Volume 14, Issue 9 - Sep 2003
Volume 14, Issue 8 - Aug 2003
Volume 14, Issue 7 - Jul 2003
Volume 14, Issue 6 - Jun 2003
Volume 14, Issue 5 - May 2003
Volume 14, Issue 4 - Apr 2003
Volume 14, Issue 3 - Mar 2003
Volume 14, Issue 2 - Feb 2003
Volume 14, Issue 1 - Jan 2003
Selecting the target year
A Slot Away Antenna with a Simple Feed Structure for Broadband Multimedia Wireless Applications
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 209~216
We design and fabricate slot array antenna for BMWS(Broadband Multimedia Wireless System) applications. This paper presents a simple feed structure, which consists of two horns and a parallel-plate waveguide, because antennas operating at 40.5 GHz~43.5 GHz have considerable feeding losses. The simple feed structure has the advantages of high-efficiency and mass-production. The fabricated antenna has a gain of 25.8 dBi with a sidelobe level below -18 ㏈ and a 3 ㏈ beamwidth of approximately 3
in the E-plane. In case of H-plane, a 3 ㏈ beamwidth is 17
and a sidelobe level is suppressed to below -27 ㏈. The experimental results are in good agreement with the simulation results. The authors expect that narrow 3 ㏈ beamwidth is obtained by combining a few proposed slot array antennas in parallel
Characteristic for the Near Field of Rectangle Loop Antenna using Optical Electric-Field Sensor
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 217~225
In this paper, in order to investigate the near field distribution characteristic of the Loop Antenna we simulated and measured the near field of a Loop Antenna using optical electric-field sensor in a large Chamber(8.5 m x 7 m x 7 m). The simulation methods were used MoM for frequency domain and FDTD for time domain. From the analysis results, it can be seen that the simulation and measurement results are very aggregated, and the optical electric-field sensor is a certificate of validity. In frequency domain, in case of the optical sensor with vertical polarization is located above the near vertical line of the Loop Antenna the signal strength level is more 15 ㏈ than with horizontal polarization. But in case of the optical sensor located above horizontal line of the Loop Antenna, signal strength level is not different. And, in the time domain, although input signal is positive, in the case of the optical sensor with vertical polarization is located above horizontal line of the Loop Antenna, it can be seen that the received pulse shape is negative.
Transfer Characteristic for Various Noise Source Positions and Power Bus Noise Reduction Method using Elevated Ground Island in High Speed PCBs
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 226~232
In this paper, design rule of power island is studied. Power island have a defect that increase transfer noise when each power bus structure is resonant. So, in this paper, resonances are suppressed for various noise source positions and in order to improve noise characteristics, it is suggested EGI in order to improve noise characteristic. At the simulation result, the least resonance is showed for various noise source position and transfer impedance with power bus resonance is reduced about 11
PCB Ground Structure Improvement for Radiation Noise Reduction
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 233~238
With the growth of high speed circuit, unwanted system noise is increased and multipoint ground is used to reduce this noise. PCB screw ground structure has radiation noise by ground loop between screws. In order to solve this problem, in this paper, we proposed improved PCB ground structure. Proposed structure improves noise absorption by using microwave absorber and conductive copper tape. We measured radiation PCB noise in the range of 1 ㎓ to 3 ㎓ to investigate proposed structure usefulness. From these results, under 2 ㎓ range proposed structure has noise reduction by 2.62 dBuV/m, which compared with screw ground.
A Wireless Optical Detector using Angle Diversity
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 239~243
In this paper, an angle diversity wireless optical detector is realized that can receive the optical signal at an angle from 0 to 360 degrees. Eight photodiodes constitute an angle diversity receiver, and in order to reduce the voltage variation with the incident angle, the optical detector is stabilized with a digital potentiometer. In a stabilized state, the voltage variation is kept within 1/10 of maximum voltage. This configuration is very useful in constructing an omni-directional receiver in a wireless optical interconnection.
A SDM Method for the PAPR Reduction in the OFDM Communication System
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 244~252
In this paper, we propose a new subblock division method(SDM) for PAPR reduction in the OFDM communication system. The SDM divides the OFDM symbol into the several subblocks. If the PAPR is high, the some of the data subblocks are replaced by the dummy zero padding blocks. We propose SDM 1 and SDM 2 according to the structure. Even though the transmission efficiency may be partially lowered, the proposed SDM can considerably reduce the computational burden while maintaining similar PAPR reduction performance, compared with the PTS which is known to be the best in the conventional methods.
Characteristics of Radiation Pattern and Power Gain for Circular Array Dipole Antennas
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 253~259
This paper presents the basic characteristics of a 5 element dipole array antenna which has a four parastic element and one driving element at the center of the circular array. The coupled integral equations for the unknown current distributions on dipole elements are derived and solved by applying Galerkin's method of moments. The numerical results show that the highest power gain of 7.8 dBi is obtained at radius of d = 0.3lλ when two short circuited parastic element neighbors. In order to verify the theoretical analysis, the radiation pattern is compared with Preston's results
The Wideband Characteristics of Wide Slot Planar Antennas
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 260~267
The wideband characteristics of planar antennas with a wide radiating slot have been examined in this paper. A various resonance modes are generated in the wide slot and the wideband characteristics are enhanced by impedance match at each resonance frequencies. In this process, the geometry effects on the impedance match were extracted and it was found that a round corner rectangular slot antenna has more stable impedance match over a wide frequency range than a normal rectangular slot antenna. The round corner rectangular slot antenna is fabricated to verify the wideband characteristics and its measured bandwidth is almost 2 octaves(2.08 ㎓~8.25 ㎓) with VSWR
Performance Analysis of VSG-CDMA Supporting Multi-Rate Date Service in the Reverse Link
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 268~275
In this paper, the capacity of VSG-CDMA system supporting multi-media service in the reverse link is analyzed by considering the two models according to the power control and user distribution. In analysis model I, assuming perfect power control and uniform distribution of users, the equation of blocking probability is calculated and the maximum number of voice and data user is derived in accordance with 1 % blocking probability. In analysis model II, it is analyzed by assuming power control error and non-uniform distribution of users. The result of analysis model I means the upper bound of system capacity in the 5 MHz wideband VSG-CDMA system, and the result of analysis model II shows the lower bound of system capacity. Also, the improved plan of performance for VSG-CDMA system is suggested by the analyzed result according to data activity and the value of
in model II.
Adaptive SLM and Side Information Insertion Method
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 276~282
OFDM is effective for the high speed data transmission. However, the nonlinear distortion is a serious problem because of the high PAPR due to many subcarriers. The conventional SLM selects the OFDM signal with the lowest PAPR. In this method, OFDM data can be correctly recovered only if the side information about the phase sequence is transmitted to receiver. This paper proposes a new method of side information insertion into the conventional SLM and reduces the computational complexity by adaptive method. Performances are compared in case that three kinds of phase sequences are used for phase rotation factor. The adaptive SLM method has the same PAPR reduction as the conventional SLM method. The required BER can be guaranteed by the proposed method. When subcarrier number N=32, computational complexity is reduced to 48 %, 72 % and 51 % for the branch number U=4, 8 and 16, respectively.
Design of a Compact Lowpass Filter having Wide Bandstop Characteristics for Microwave and Millimeter-Wave Circuit Applications
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 283~289
In this paper, we proposed novel multilayer photonic bandgap(PBG) structure using DSL(Descended Signal Line). From measurement result, the proposed PBG structure using DSL is reduced 72 % at size and increased 13 % at bandwidth compared to typical multilayer DGS(Defected Ground Structure). It is also reduced 42 % at size and increased 23 % at bandwidth compared to PBG structure using EGP(Elevated Ground Plane). In case of measurement for manufactured six PBG patterns, all patterns have the same cutoff frequency and bandstop characteristics. So it can be used for bandstop filter having very precise tolerance of below 300 MHz at 20 ㎓ if it is applied to real product and this filter will be useful for small microwave integrated circuit and module development.
Absorption Properties according to Particle Size of Ferrite in EM Wave Absorber for Mobile Phone
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 290~295
In this study, we investigated the effect of particle size of Mn-Zn ferrite which is used as a material of electromagnetic wave absorber on electromagnetic wave properties. With increasing the particle size, the matching frequency is shifted toward lower frequency and the absorption ability of electromagnetic wave is decreased. We suggest that a sheet-type ferrite absorber composed of Mn-Zn ferrite with large particle is useful to compare with it composed of small particle size for mobile phone.
Design of the Broad Band Phase Shifter for DTV Receiver
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 296~303
In this paper, a design method is proposed for the reflection type phase shifter applied to the DTV(Digital TV) receiver, and a phase shifter is designed by using the design equations to satisfy the phase shifting range over 180 degrees for frequency range from 470 MHz to 860 MHz, the receiving band of DTV. From the proposed method, it is possible that the systematic design of the reflection type phase shifter with desired phase shifting range and insertion loss. In addition, it is found that the realized phase shifter satisfies the given specifications.
Design and Implementation of 2.4 ㎓ and 5 ㎓ Dual Band Antenna for Access Point of Wireless LAN
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 14, issue 3, 2003, Pages 304~311
In this paper, we present the 2.4 ㎓ and 5 ㎓ dual band antenna fur access point of WLAN(Wireless Local Area Network). The proposed antenna must have equal gains in both frequency bands to accept two services. We proposed using collinear array to compensate gain difference for two different frequency bands. Simulation results using 3D simulation program, CST MWS(Microwave Studio), for dual band antenna with collinear away show that the maximum gain is about 4.7 dBi at 2.4 ㎓, 5.2 dBi at 5.7 ㎓. We got additional gain of about 2.1 ㏈ with collinear array for 2.4 ㎓ in measurement. Measured results for the dual band antenna with collinear array show applicable performances for access point of wireless LAN.