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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 23, Issue 12 - Dec 2012
Volume 23, Issue 11 - Nov 2012
Volume 23, Issue 10 - Oct 2012
Volume 23, Issue 9 - Sep 2012
Volume 23, Issue 8 - Aug 2012
Volume 23, Issue 7 - Jul 2012
Volume 23, Issue 6 - Jun 2012
Volume 23, Issue 5 - May 2012
Volume 23, Issue 4 - Apr 2012
Volume 23, Issue 3 - Mar 2012
Volume 23, Issue 2 - Feb 2012
Volume 23, Issue 1 - Jan 2012
Selecting the target year
Design of a Double-Faced Monopole Antenna Using the Coupling Effect of Induced Currents
Choi, Young ; Lee, Seungwoo ; Kim, Nam ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1327~1336
DOI : 10.5515/KJKIEES.2012.23.12.1327
In this paper, the dual-faced monopole antenna, which is arranged by numerous rectangular ring patches in sequence for the multi-bands is proposed. The ring type structure of the patch can be increased the bandwidth. Therefore the bandwidth and beam width are improved by using multiple arrayed patches. When the ring type patches are inserted serially, the resonance frequencies are occurred by the current flow from the first ring patch. It is possible because the gap between the patches is very narrow. In addition, if the patches are composed on the same plane as the feed-line, fabrication could be very difficult because the gap between the patches is extremely narrow. The thickness and permittivity of the antenna, moreover, are very important parameters because both sides of the substrate are used. We finally found the optimal thickness and permittivity to generate the coupling effect by simulation. All patches are consisted of 4-steps which the patch size was decreased 85 % by each step. In conclusion, the resonant frequency bands are 1.75~2.6 GHz(850 MHz), 3.24~3.46 GHz(220 MHz), 3.8~4.0 GHz(200 MHz), and 4.4~4.9 GHz(500 MHz).
Design of a Dual-Mode Planar Antenna Using a Reconfigurable Matching Network
Kim, Yoon Geon ; Kay, Youngchul ; Choo, Hosung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1337~1342
DOI : 10.5515/KJKIEES.2012.23.12.1337
In this paper, we propose a novel reconfigurable antenna that can change the electrical shape of the matching network using RF switches of PIN diodes. The designed antenna operates at two different modes that are Mode 1 (HSDPA band, 2.1~2.2 GHz) and Mode 2(WiBro WiFi band, 2.3~2.5 GHz). The antenna is built on both sides of a polyarcylate substrate. The measured reflection coefficient shows a matching bandwidth of 547 MHz(
<-3 dB, 2.035~2.582 GHz) for Mode 1 and 600 MHz(
<-3 dB, 2.2~2.8 GHz) for Mode 2, and it shows average vertical gains of -4.4 dBi and -4.5 dBi in x-y plane, respectively.
Multi-Band Antenna Design by Controlling Characteristic of Third Order Mode
Yu, Jaekyu ; Zhang, Rui ; Liu, Yang ; Lee, Jaeseok ; Kim, Hyung-Hoon ; Kim, Hyeongdong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1343~1350
DOI : 10.5515/KJKIEES.2012.23.12.1343
This paper presents a new method for designing a dual-band WIFI antenna using the third-order harmonic mode of a monopole antenna whose first-order mode operates at the low frequency band of WIFI. As analysing the current distribution of the third-order mode of this monopole antenna, the strongest point of electric field can be found. Then by attaching a stub at this point, the resonant frequency of the stub radiator can be adjusted from the third-order mode of the monopole antenna into the high frequency band of WIFI and the input impedance at this resonant frequency can be controlled with the width of the branch, without affecting the low frequency band of WIFI (the first-order mode of the monopole antenna). The compact dual-band antenna is designed at the size of an USB(universal serial bus) dongle and the bandwidth covers 600 MHz(2.3~3 GHz) at 2 GHz and 1 GHz(4.9~5.9 GHz) at 5 GHz under -10 dB which is satisfied with WLAN frequency. Efficiency of proposed antenna achieves over 50 % at WLAN frequency.
Design of Interleaved Thinned Planar Arrays Using Cyclic Difference Set
Kwon, Gina ; Hwang, Keum Cheol ; Park, Joon-Young ; Kim, Seon-Joo ; Kim, Dong-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1351~1358
DOI : 10.5515/KJKIEES.2012.23.12.1351
In this paper, an analytical technique is proposed for the design of interleaved thinned planar array with well-behaved and predictable sidelobes. The interleaved arrays are composed of thinned planar subarrays based on cyclic difference sets(DSs). Becauce sidelobes of thinned planar subarrays based on DS are predictable by DS parameters, the subarrays exhibit very similar sidelobe levels by utilizing DS and complementary DS with similar autocorrelations each other. The combinatorial method also allows the design of interleaved placements with simultaneously optimum peak sidelobe levels(PSLs) of subarrays using cyclic shift-a property of DSs. The optimized PSLs of the interleaved array are -12.47 dB and -10.34 dB.
A Compact C-Band Semi-Lumped Lowpass Filter with Broad Stopband Using a Chip Inductor
Jang, Ki-Eon ; Lee, Gi-Moon ; Kim, Ha-Chul ; Choi, Hyun-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1359~1364
DOI : 10.5515/KJKIEES.2012.23.12.1359
The C-band semi-lumped lowpass filter with broad stopband and compact size characteristic using chip inductor is proposed. To provide an additional attenuation pole in stopband by SRF, a separable inductor is added to proposed structure, and it has broad stopband characteristic. The third order elliptic function lowpass filter with chip inductor(L: 9.1 nH, SRF: 5.5 GHz, Q: 25) has insertion loss of 0.38 dB, cutoff frequency of 920 MHz, broad stopband(below 20 dB) of 1.43~7.8 GHz and the size is reduced 37.4 % compared to distributed inductor.
Uncertainty Analysis of 1 GHz Band Impulse Spectrum Amplitude
Lee, Dong-Joon ; Lee, Joo-Gwang ; Kwon, Jae-Yong ; Kang, Tae-Weon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1365~1372
DOI : 10.5515/KJKIEES.2012.23.12.1365
This paper presents a methodology to accurately evaluate the spectral components of impulse signals which are delivered from an impulse generator through the measurement system. The complicated terms for uncertainty measurement of impulse spectrum amplitude and their analysis methods and experimental results are discussed. The expanded uncertainty of the impulse spectrum measurement is 0.015, which is believed to be the best domestic measurement capability and comparable to those of world class.
Analysis on the RFI Noise Path of Electrical Railway System in the Frequency Range of 9 kHz to 150 kHz
Kwun, Suk-Tai ; Chung, Yeon-Choon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1373~1379
DOI : 10.5515/KJKIEES.2012.23.12.1373
The interaction of magnetic field in the frequency range of 9~150 kHz radiating from a railway system with wireless systems has been the cause of radio frequency interference. In this paper, the equivalent circuit model of the RFI noise is proposed through source and transfer path analysis, and it is confirmed that the switching noise of several kHz that occurs a vehicle traction drive system and a substation is radiated by forming the loop circuit with a feeder line by a rolling stock. And the validity of the proposed equivalent circuit model is verified by analyzing the effects of RC banks installed in the real railway between Guri and Guksu stations, the RFI noise can be effectively mitigated by loading suitable capacitance between rail and feeding line.
Compact T/R Module Having Improved T/R Isolation Using a Bias Timing Scheme
Park, Sung-Kyun ; Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1380~1387
DOI : 10.5515/KJKIEES.2012.23.12.1380
The transmit/receive(T/R) module is a key component in the active phased array system. The brick-type T/R module has been widely used and the miniaturization has been an important factor to get the flexibility of the system configuration. For the miniaturization, multi-function chips(MFC) having a common leg configuration are suitable to reduce the number of required MMICs and a high isolation between transmit and receive paths is necessary for the high gain T/R modules. In this work, we propose a bias timing scheme for the compact T/R module and show the optimum timing based on measurements, in order to improve the feed-back path loop problem and the consequent isolation problem of the common leg configuration. We have implemented high power(7 W/channel) and high T/R gain(35 dB transmit and 30 dB receive gains) within the half size(
) of the conventional T/R modules.
An Analysis of Radio Frequency Interferences in L-Band SAR Images
Lee, Seul-Ki ; Lee, Woo-Kyung ; Lee, Jae-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1388~1398
DOI : 10.5515/KJKIEES.2012.23.12.1388
SAR(Synthetic Aperture Radar) systems can provide images of wide coverage in day, night, and all-weather conditions. However wideband SAR systems are known to be vulnerable to interferences from other devices operating at in-band or adjacent spectrums and this may lead to image corruptions. In this paper, a SAR point target simulator is developed that provides performance analysis on image distortion caused by interferences from other devices. Interference signals are generated based on the experimental data observed from acquired SAR raw data. Simulation results include typical SAR performance measures such as spatial resolution, peak to sidelobe ratio and integrated sidelobe ratio. Finally, SAR target simulations are performed and shown to correspond to the image corruptions found in real SAR missions affected by RF interferences.
Resonant Transmission through C-Shaped and H-Shaped Small Apertures and the Mutual Coupling Effect between Two C-Shaped Apertures
Ko, Ji-Hwan ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1399~1405
DOI : 10.5515/KJKIEES.2012.23.12.1399
Transmission cross section characteristics as a measure of transmission efficiency has been analyzed numerically for the H-shaped and C-shaped small apertures in the infinite conducting plane when illuminated by a plane wave. It has been found that C-shaped aperture has the larger transmission cross section than that of H-shaped aperture under the condition of the same perforated aperture area. Main attention has been focused on studying the mutual coupling effect between two C-shaped apertures on the transmission cross section characteristic. Parallel configuration which is composed of two C-shaped apertures arranged along the x-axis and collinear configuration which is composed of two C-shaped arrayed along the y-axis have been investigated from the viewpoint of enhanced transmission cross section characteristics.
Performance Analysis of an Energy Detection Based Cooperative Spectrum Sensing with a Single Threshold in the Presence of Noise Uncertainty
Lim, Chang Heon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1406~1411
DOI : 10.5515/KJKIEES.2012.23.12.1406
An energy detection based spectrum sensing has been found to be vulnerable to the noise power uncertainty. A cooperative spectrum sensing with an energy detector has appeared as one of the solutions to alleviate this difficulty. However, its performance analysis in a fading environment has not been reported yet in the literature. Motivated by this, this paper presents the performance analysis of the scheme by extending our previous work on evaluating the performance of an energy detector in the presence of noise power uncertainty. The analysis shows that the false alarm probability and detection probability gets higher as the sensing time and/or the number of the secondary users in the OR based cooperative spectrum sensing scheme increase when the noise power uncertainty exists.
Numerical Analysis of the Ground Penetrating Radar's Return Signal for Mine Detection at Various Frequencies and Soil Conditions
Hong, Jin-Young ; Ju, Jung-Mung ; Han, Seung-Hoon ; Oh, Yisok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 23, issue 12, 2012, Pages 1412~1415
DOI : 10.5515/KJKIEES.2012.23.12.1412
Return signals of a ground penetrating radar(GPR) for mine detection at various frequencies and soil moisture contents are analyzed in this paper. We first compute the dielectric constant, conductivity and attenuation loss based on clay loam which is Korea standard soil. The mine-detection images of GPR at various frequencies are also obtained using the finite-difference time-domain(FDTD) technique. Then, the signal-to-clutter ratio(SCR) and received power of the radar are studied. It is shown that the variable frequency channels are suitable for a GPR to detect landmines at various soil conditions.