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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 25, Issue 12 - Dec 2014
Volume 25, Issue 11 - Nov 2014
Volume 25, Issue 10 - Oct 2014
Volume 25, Issue 9 - Sep 2014
Volume 25, Issue 8 - Aug 2014
Volume 25, Issue 7 - Jul 2014
Volume 25, Issue 6 - Jun 2014
Volume 25, Issue 5 - May 2014
Volume 25, Issue 4 - Apr 2014
Volume 25, Issue 3 - Mar 2014
Volume 25, Issue 2 - Feb 2014
Volume 25, Issue 1 - Jan 2014
Selecting the target year
Aperture Cut-off Filter for Reduction of Electromagnetic Field Penetration through a Slot in Conducting Screens
Kim, Ki-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1201~1211
DOI : 10.5515/KJKIEES.2014.25.12.1201
The purpose of this paper is to present the aperture cut-off filter for reduction of electromagnetic field penetration through a slot in conducting screen. The reduction characteristics of electric field penetration by the aperture cut-off filter are considered. In order to establish the concept of the aperture cut-off filter, the integral equation on the slot aperture field distribution is derived and solved by method of moments, and the reduction characteristics of penetration electric fields for the incident plane wave are calculated. The numerical results showed that the aperture cut-off filter for reduction of electric field penetration through the slot can be realized. To check the validity of the concept of an aperture cut-off filter and the theoretical analysis, the calculated electric field penetration of the metallic wall with narrow slot were compared with the experimental results.
An UWB Design of Plane Bow-Tie Monopole Antenna
Kim, Tae-Woo ; Choi, Kyoung ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1212~1218
DOI : 10.5515/KJKIEES.2014.25.12.1212
This paper proposes a planar bow-tie UWB antenna by modifying the ground patch of a reference bowtie-monopole antenna satisfying low band of UWB. The proposed antenna was implemented with five-angled ground patch to be operated in whole UWB band, while the reference antenna had a ground patch of half circle type. The measured return loss satisfies less than -10 dB in 3.1~10.6 GHz, except 4.9~5.8 GHz rejection band. The measured radiation pattern is almost the same with that of the monopole antenna. The radiation gain reduction is about 8 dB at rejection band.
Performance Improvement of ZnO Thin Films for SAW Bandpass Filter
Lee, Seung-Hwan ; Kang, Kwang-Yong ; Yu, Yun-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1219~1227
DOI : 10.5515/KJKIEES.2014.25.12.1219
For development of the surface acoustic wave bandpass filter(SAW-BPF), we fabricated the high quality ZnO thin films through the step-by-step(double) deposition using two different deposition methods which are pulsed laser deposition(PLD) and RF sputtering techniques. The second growth of ZnO thin films was completed by RF sputtering method on the first ZnO thin films pre-deposited by PLD method. The characteristics of ZnO thin films were analyzed by XRD, SEM and AFM systems. The FWHM of
-scan analysis and the minimum RMS value of surface roughness of step-by-step grown ZnO thin films were
and 1.108 nm respectively. As a result, the crystallinity and the preferred orientation of the grown ZnO thin films were kept good quality and the surface roughnesses of those were improved by post-annealing process as comparison with ZnO thin film fabricated by the conventional PLD technique only. Using these proposed ZnO thin films, we demonstrated the RF device such as SAW-BPF, built by the proposed ZnO thin films, shows that it has the bandwidth of 2.98 MHz and the insertion loss of 36.5 dB at the center frequency of 260.8 MHz, respectively.
Modelling Method for Removing Measurement Uncertainty in Chip Impedance Characterization of UHF RFID Tag IC
Yang, Jeenmo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1228~1235
DOI : 10.5515/KJKIEES.2014.25.12.1228
Input impedance of UHF RFID tag chip is needed to design a tag. In determining the chip impedance, direct measurement method is adopted commonly. In this paper, problems generated from fixtures that interface between tag chip and coaxial-oriented measurement instrument are investigated and the result of the problems is shown, when the direct measurement method is applied. As an alternative to the method, a modeling method is proposed and its validity and accuracy are shown.
CMOS Based D-Band Push-Push Voltage Controlled Oscillator
Jung, Seungyoon ; Yun, Jongwon ; Kim, Namhyung ; Rieh, Jae-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1236~1242
DOI : 10.5515/KJKIEES.2014.25.12.1236
In this work, a D-band VCO(Voltage Controlled Oscillator) has been developed in a 65-nm CMOS technology. The circuit was designed based on push-push mechanism. The output oscillation frequency of the fabricated VCO varied from 152.7 GHz to 165.8 GHz, and the measured output power was from -17.3 dBm to -8.7 dBm. A phase noise of -90.9 dBc/Hz is achieved at 10 MHz offset. The chip size of the circuit is
including the probing pads.
A Wideband DDS Module for High-Speed Frequency Synthesizer
Park, Beom-Jun ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1243~1250
DOI : 10.5515/KJKIEES.2014.25.12.1243
In this paper, a wideband DDS module covering the frequency range from 0.5 to 1.1 GHz was designed and fabricated. The clock frequency of the DDS was selected 2.4 GHz in order for 600 MHz output bandwidth. Multiple spurious cancelling signals having same amplitude and
phase difference compared to the spurious were created at the additional path and added to the output signal within DDS for the spurious performance improvement. The fabricated DDS module showed better spurious performance than the commercial DDS one more than 10 dB and frequency tuning time was 340 ns below.
A Wideband High-Speed Frequency Synthesizer Using DDS
Park, Beom-Jun ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1251~1257
DOI : 10.5515/KJKIEES.2014.25.12.1251
In this paper, a 6~13 GHz ultra high speed frequency synthesizer having minimum 30 kHz step size and minimum 500 ns frequency settling time is proposed. In order to obtain fast settling time, fine resolution, and good phase noise performance, wideband output frequencies were synthesized based on DDS(Direct Digital Synthesizer) and analog direct frequency synthesis technology. The phase noise performance of wideband frequency synthesizer was estimated by the superposition theory and its results were compared with measured ones. The measured frequency settling time was below 500 ns, phase noise was below -106 dBc @ 10 kHz at 13 GHz, and frequency accuracy was measured below
Design and Performance Evaluation of In-Band Full-Duplex System Based on Direct Conversion Receiver
Keum, Hong-Sik ; An, Changyoung ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1258~1268
DOI : 10.5515/KJKIEES.2014.25.12.1258
In this paper, we propose and design IBFD system based on DCR. And then, we analyze effect of DC offset by self-interference in the proposed system. Also, we evaluate BER performance of the proposed system according to DC offset. As a result of the simulation, we can confirm that when the self-interference is not completely cancelled by the RF cancellation, linearity of desired signal and self-interference is distorted by DC offset. Also, in the proposed system using m-QAM modulation, DC offsets of multi-level are caused by self-interference with m-QAM modulation. As a result, constellations of desired signal and self-interference are greatly distorted. In contrast, in the proposed system using m-PSK modulation, DC offset of single level is caused by self-interference with m-PSK modulation. In this condition, we confirm that distortion of constellations of desired signal and self-interference is less than when using m-QAM modulation. That is, we can confirm that m-PSK modulation is effective than m-QAM modulation in DCR based IBFD system. Also, we can confirm that it is important to cancel self-interference as much as possible in RF-stage.
Diagnosis of Power and Control Cables Using Change of Reflection Coefficients Due to Weak Fault
Yong, Hwan-Gu ; Cui, Chenglin ; Chae, Jang-Bum ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1269~1274
DOI : 10.5515/KJKIEES.2014.25.12.1269
Since power and control cables have narrow bandwidth due to their loss at high frequencies, it is difficult to detect the weak fault using conventional reflectometry. It is because the reflected wave caused by the weak fault is overlapped and hidden by the ripple of the strong reflected wave from the end of the cable. This paper proves that the reflected wave from the weak fault can be considered to be linearly superposed on the strong reflected wave from the end of the cable based on the transmission line theory. Then, the weak fault point is experimentally diagnosed using the difference between reflection coefficients before and after the fault generation.
Maximum Likelihood Based Doppler Estimation and Target Detection with Pulse Code Modulated Waveform
Yang, Eunjung ; Lee, Heeyoung ; Song, Junho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1275~1283
DOI : 10.5515/KJKIEES.2014.25.12.1275
Characteristics of PCM(Pulse Code Modulation) waveform are suitable for target tracking. Especially in terms of dwell time, it is desirable to detect and track a moving target with the single PCM waveform for a MFR(Multi-Function Radar) which carries out multiple tasks. General PCM waveform processing includes Doppler filter bank caused by the characteristics of ambiguity function, to detect target and estimate Doppler frequency, which induces hardware burden and computational complexity. We propose a ML(Maximum Likelihood) based Doppler estimator for a PCM waveform, which is the closed form suboptimal solution and computationally efficient to estimate Doppler frequency and detect a moving target.
Jammer Suppression by Eigen Analysis in Multi-Carrier Radar
Jeon, Hyeon-Mu ; Shin, Seong-Kwan ; Chung, Yong-Seek ; Chung, Won-Zoo ; Kim, Jong-Mann ; Yang, Hoon-Gee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1284~1291
DOI : 10.5515/KJKIEES.2014.25.12.1284
For detection and parameter estimation, a multicarrier radar should discriminate a channel containing jamming signal and either leave it out or regenerate jammer suppressed target signal. To discriminate jamming channels, we use the angular spectrum of an eigenvector that embeds target echoes and jamming signals. We propose a criteria to discriminate the jammer channels and its basis through mathematical analysis. Moreover, we show some procedures to regenerate the jammer suppressed target echoes. Finally, the validity of the proposed method is demonstrated through simulation results showing improved performance in terms of direction of arrival(DOA) estimation.
Performance Analysis on Terrain-Adaptive Clutter Map Algorithm for Ground Clutter Rejection of Weather Radar
Kim, Hye-Ri ; Jung, Jung-Soo ; Kwag, Young-Kil ; Kim, Ji-Won ; Kim, Ji-Hyeon ; Ko, Jeong-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1292~1299
DOI : 10.5515/KJKIEES.2014.25.12.1292
Weather radar systems can provide weather information of the ground, sea, and air in extensive spatial coverage in near real time. However, it becomes problematic when ground clutter signal exists around precipitation because strong signals of ground can cause a false precipitation report. A large percentage of land coverage of Korea consists of mountainous regions where ground clutter needs to be mitigated for more accurate prediction. Thus, it is considered necessary to introduce a new suitable ground clutter removal technique specifically adequate for Korea. In this paper, the C-Map(Clutter Map) method using raw radar signals is proposed for removing ground clutter using a terrain-adaptive clutter map. A clutter map is generated using raw radar signals(I/Q) of clear days, then it is subtracted from received radar signals in frequency domain. The proposed method is applied to the radar data acquired from Sobaeksan rain radar and the result shows that the clutter rejection ratio is about 91.17 %.
Equivalent Circuit Analysis of a Rectangular Waveguide Probe with H-type Small Aperture
Ko, Ji-Hwan ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 12, 2014, Pages 1300~1305
DOI : 10.5515/KJKIEES.2014.25.12.1300
Equivalent circuits for the waveguide probe with H-shaped small aperture, as a key ingredient of near field microwave microscope, is described along with a working principle of the probe. Small rectangular or circular aperture in comparison with the wavelength behaves like the inductive element. So adding the ridged structure (corresponding to capacitive component) to the small aperture allows the transmission resonance to occur. For verification, we represents the equivalent circuit descriptions for the two types, ridged aperture and cavity types. The values of obtained by use of the equivalent circuit approaches are compared with those obtained by use of the available numerical software. The results are also experimentally verified.