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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 20, Issue 12 - Dec 2009
Volume 20, Issue 11 - Nov 2009
Volume 20, Issue 10 - Oct 2009
Volume 20, Issue 9 - Sep 2009
Volume 20, Issue 8 - Aug 2009
Volume 20, Issue 7 - Jul 2009
Volume 20, Issue 6 - Jun 2009
Volume 20, Issue 5 - May 2009
Volume 20, Issue 4 - Apr 2009
Volume 20, Issue 3 - Mar 2009
Volume 20, Issue 2 - Feb 2009
Volume 20, Issue 1 - Jan 2009
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Design of a Trapezoidal Microstrip Patch Antenna with Fractal Structure for Vehicle GPS
Sung, Ha-Won ; Son, Tae-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 215~221
DOI : 10.5515/KJKIEES.2009.20.3.215
In this paper, a slotted trapezoidal microstrip fractal patch antenna is designed and fabricated for the vehicle GPS antenna. We designed air substrate patch antenna to obtain gain improvement by the elimination of dielectric loss. By applying fractal structure with crossed slot to trapezoidal patch, we obtained 42.5 % as much patch size as conventional triangular patch antenna. Measured bandwidth was 200 MHz on GPS band under VSWR 2:1 And gain was 4.31 dBi at resonant frequency that is 2
5 dB higher gain than conventional ceramic patch antenna on GPS band.
Development of EM Wave Absorber for Increasing Communication Range in RFID System
Park, Soo-Hoon ; Kim, Dong-Il ; Yoon, Sang-Gil ; Yoo, Gun-Suk ; Jeong, In-Seong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 222~229
DOI : 10.5515/KJKIEES.2009.20.3.222
In this paper, we designed and fabricated the EM wave absorbers for preventing the reduction of the communication range when RFID Tag is approached to a metal plate. The EM wave absorber samples were fabricated with difference composition ratios of Amorphous metal powder and CPE, the absorption abilities of which were simulated by substituting different thicknesses of the EM wave absorbers. Then the EM wave absorbers are manufactured based on the simulated results. By using the EM wave absorbers, we have confirmed the improvement effect of RFID tag antenna and the increase of communication range of RFID system. As a result, it was cleary shown that the communication range of RFID system is improved by adopting the EM wave absorber with the composition ratio of Amorphous metal powder:CPE=80:20 wt.% and the thickness of 4 mm. Thus, it was confirmed that the proposed EM wave absorber can increase the communication range of RFID system from 0.8 m to 5.2 m in UHF band.
On-Glass Vehicle Antennas Using a Multi-Loop Structure
Ahn, Seung-Beom ; Kay, Young-Chul ; Choo, Ho-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 230~239
DOI : 10.5515/KJKIEES.2009.20.3.230
In this paper, we propose a novel on-glass antenna for FM radio reception in a recreation vehicle(RV). We use a multi-loop structure that takes advantage of a broad matching bandwidth and a high vertical radiation gain by efficiently utilizing a given space of a quarter glass in spite of the simple planar structure. Transparency of the antenna is also improved by adjusting the stripline widths based on the induced current distributions. The proposed antenna is printed on a quarter glass of a commercial vehicle and antenna performances such as the return loss and the gain are measured in a semi-anechoic chamber. The result shows the average gain of -9.67 dBi along the bore-sight direction(
) in the FM radio band(80
l10 MHz), which is higher than a commercial monopole typed on-glass antenna(
=-12.49 dBi) and micro-antenna(
=-19.24 dBi) mounted on the roof of the RV.
Interference Effect of Microwave Oven Noise to Wireless LAN Using a GTEM Cell
Chung, Yeon-Choon ; Jeon, Sang-Bong ; Kwun, Suk-Tai ; Yun, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 240~247
DOI : 10.5515/KJKIEES.2009.20.3.240
In this paper, we proposed the method of the interference evaluation between the microwave oven noise and the wireless LAN(Local Area Network) by using the GTEM cell. We used microwave oven noise in time to assess the interference unintentional noise effects on wireless LAN and realized by combining an AM(Amplitude Modulation) modulator and a FM(frequency Modulation) modulator. Also the GTEM cell can be used to guarantee the reliability by the evaluations of the frequency and time responses. As measurement results for the APD(Amplitude Probability Distribution) of the interfering noise we analyzed the effect of microwave oven noise to the throughput of wireless LAN.
An Adaptive Adjacent Cell Interference Mitigation Method for Eigen-Beamforming Transmission in Downlink Cellular Systems
Chang, Jae-Won ; Kim, Se-Jin ; Kim, Jae-Won ; Sung, Won-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 248~256
DOI : 10.5515/KJKIEES.2009.20.3.248
EB(Eigen-Beamforming) has widely been applied to MIMO(Multiple-Input Multiple-Output) systems to form beams which maximize the effective signal-to-interference plus noise ratio(SINR) of the receiver using the singular value decomposition(SVD) of the MIMO channel. However, the signal detection performance for the mobile station near the cell boundary is severely degraded and the transmission efficiency decreases due to the influence of the interference signal from the adjacent cells. In this paper, we propose an adaptive interference mitigation method for the EB transmission, and evaluate the reception performance. In particular, a reception strategy which adaptively utilizes optimal combining(OC) and minimum mean-squared error for Intercell spatial demultiplexing(MMSE-lSD) is proposed, and the reception performance is investigated in terms of the effective SINR and system capacity. For the average system capacity, the proposed adaptive reception demonstrates the performance enhancement compared to the conventional EB reception using the receiver beamforming vector, and up to 2 bps/Hz performance gain is achieved for mobile station located at the cell edge.
Estimation of Spectrum Requirements for 3G Mobile Communications Based on the Analysis of Korean Mobile Communications Traffic
Chung, Woo-Ghee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 257~263
DOI : 10.5515/KJKIEES.2009.20.3.257
Recently, as the 3G services of Korea have stepped into the developing stage and the traffic has been rapidly increasing, the spectrum requirements have been getting very large. Therefore spectrum reforming is considered actively and firstly exact methodology of spectrum requirement estimation is needed. But existing methodology depends on the future's service forecast than the present substantial data. This paper proposed the exact methodology of spectrum requirement estimation is based on the real data. So this paper analyzed the characteristics of Korean mobile communication traffic based on the real data and the algorithm suitable for estimation of spectrum requirements for 3G mobile communications, and calculated the parameters needed to estimate the spectrum requirements. Based on the traffic parameters of December 2007, simulations to Bet the estimation of annual spectrum requirements were implemented for the two different cases: one of which is 44 % annual increase in the data traffic and the other is 21 % annual increase. The simulation results show 90 MHz for the first case and 60 MHz for the second case in December 2011.
Design and Fabrication of a Ka-Band 10 W Power Amplifier Module
Kim, Kyeong-Hak ; Park, Mi-Ra ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 264~272
DOI : 10.5515/KJKIEES.2009.20.3.264
In this paper, a Ka-band 10 W power amplifier module is designed and fabricated using MIC(Microwave Integrated Circuit) module technology which combines multiple power MMIC(Monolithic Microwave Integrated Circuit) chips on a thin film substrate. Modified Wilkinson power dividers/combiners are used for millimeter wave modules and CBFGC-PW-Microstrip transitions are utilized for reducing connection loss and suppressing resonance in the high-gain and high-power modules. The power amplifier module consists of seven MMIC chips and operates in a pulsed mode. for the pulsed mode operation, a gate pulse control circuit supplying the control voltage pulses to MMIC chips is designed and applied. The fabricated power amplifier module shows a power gain of about 58 dB and a saturated output power of 39.6 dBm at a center frequency of the interested frequency band.
Four-Elements L-Shaped Slot Array Monopole Antenna with Dipole-like Radiation Pattern
Nam, Sung-Soo ; Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 273~279
DOI : 10.5515/KJKIEES.2009.20.3.273
In this paper, an antenna which has dipole-like radiation pattern and low profile is proposed. The antenna is composed of four elements slot array based on L-shaped 0.43
slot element. It presents a omni-directional radiation patter in the azimuth plane and has a null toward broad-side direction. In the design, a small mono-pole antenna which acts as a large capacitance element, combined with the partially removed ground plane by four L-shaped slots. As a result, these structure act as a LC resonator for radiation. The measured result shows, the impedance bandwidth(VSWR
2) of the proposed antenna is 60 MHz(2.35
2.41 GHz). The measured maximum radiation gain and efficiency of proposed antenna is 0.02 dBi, 56.7 % at center frequency 2.38 GHz, respectively. The proposed antenna can be applied to wireless tan access point system.
A Stripline 10-Way Power Divider for the Feed Network of an S-band Linear Array Antenna
Park, Il-Ho ; Kim, Rak-Young ; Park, Jung-Yong ; Jeong, Myung-Deuk ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 280~288
DOI : 10.5515/KJKIEES.2009.20.3.280
In this paper, a high-power and low-loss stripline 10-way power divider is designed and fabricated fur the feed network of an S-band linear array antenna with Chebyshev current distribution which has a narrow beam width and low side lobe level(SLL) of 35 dB or more. The unit cell of the power divider is based on a T-junction power divider and the whole divider is comprised of the cascaded unit cells. The multi-stage impedance transformer and modified ring hybrid are used in designing the power divider for performance improvement. And the reflection loss and insertion loss are improved by modifying a connector structure for a coaxial-to-stripline transition.
Analysis of Target Identification Performances Based on HRR Profiles against the Moving Targets
Park, Jong-Il ; Jung, Sang-Won ; Kim, Kyung-Tae ; Chun, Jong-Hoon ; Bae, Jun-Woo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 289~295
DOI : 10.5515/KJKIEES.2009.20.3.289
HRR(High Resolution Range) profiles show one-dimensional radar images including electromagnetic scattering phenomena of a target. Thus, they are not only robust to noise, but also easily obtainable in a real-time. However, in order to construct a training database for the success of radar target identification, a huge amount of HRR profiles are needed because HRR profiles are highly dependent on the relative angle between the radar and the target. In order to alleviate this difficulty, a database construction method based on the scenarios of target's movement is proposed. The proposed method is able to provide a reliable target identification performance even with a small amount of training database.
A Compact Circular-Polarized Microstrip Antenna Using the Slit and Multi-Layer Structure
Cho, Sang-Hyeok ; Pyo, Seong-Min ; Kim, Jung-Min ; Lee, In-Young ; Kim, Young-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 296~302
DOI : 10.5515/KJKIEES.2009.20.3.296
In this paper, a planar microstrip patch antenna is proposed using the slit on the top layer of a multi-layered structure for GPS application. The proposed antenna has a circular polarization at 1,575.42 MHz. This proposed antenna is fabricated on multi-layered FR4 substrate. The slits embedded on the top plane may yield to lower a resonance frequency and sustain a broad bandwidth. The proposed antenna size is
. The measured gain of 0.5 dBi, 10 dB bandwidth(VSWR 2:1) of 70 MHz(4.4 %), and 3 dB axial-ratio bandwidth of 15 MHz(1 %) have been obtained, respectively.
A Study on the Microwave Electric-Field Focusing Waveguide Systems for Driving Plasma Visible Light
Jeon, Hoo-Dong ; Park, Eui-Joon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 303~312
DOI : 10.5515/KJKIEES.2009.20.3.303
In this study, a waveguide system for focusing the electric field is presented to emit the microwave-driven plasma visible light. This system consists of a magnetron for the microwave power supply, the waveguide section for power propagation, and the mesh-type cavity reactor. The quartz bulb containing a dose of sulfur powder and buffer gas Ar is located in the reactor, and forced by the strongly concentrated electric field for generating and exciting the sulfur plasma. That is, the conductor tips are loaded on each inner wall of the waveguide and the reactor, and then the plasma bulb is positioned between the tips, hence focusing the strong electric field on the bulb. Furthermore the waveguide section is designed for minimizing the degradations of matching characteristics according to the variations of the electrical conductivities of plasma at the transitory phase for plasma generation, hence providing the stable operation. Finally, the 2.45 GHz aluminum waveguide system is constructed, and then experiments for emitting the visible light are performed by using 400 W-class magnetron, showing the validity of designed system.
Design of Downlink Channel for Transportable KOMPSAT Ground Station Using Sub-Carrier Signal
Ahn, Sang-Il ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 3, 2009, Pages 313~321
DOI : 10.5515/KJKIEES.2009.20.3.313
This paper describes the downlink design of a transportable small-sized KOMPSAT ground station using sub-carrier signal. Based on the analysis of the transmission modes of satellite real-time telemetry and range measurement signals, the downlink channel design of KOMPSAT ground station using sub-carrier signal was processed. By considering the threshold signal-to-noise ratio of real-time 2 kbps telemetry signal and the required signal-to-noise ratio for satellite range measurement, the small-sized KOMPSAT downlink channel with G/T value of 6.5 dB/K was designed. The real G/T of implemented ground station was proven to be 6.62 dB/K when measured using the Sun. Moreover, through interface test with KOMPSAT, the ground station has shown the required link performance for real-time telemetry acquisition using sub-carrier and was consequently evaluated to be adequate for a transportable small-sized KOMPSAT ground station.