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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 26, Issue 12 - Dec 2015
Volume 26, Issue 11 - Nov 2015
Volume 26, Issue 10 - Oct 2015
Volume 26, Issue 9 - Sep 2015
Volume 26, Issue 8 - Aug 2015
Volume 26, Issue 7 - Jul 2015
Volume 26, Issue 6 - Jun 2015
Volume 26, Issue 5 - May 2015
Volume 26, Issue 4 - Apr 2015
Volume 26, Issue 3 - Mar 2015
Volume 26, Issue 2 - Feb 2015
Volume 26, Issue 1 - Jan 2015
Selecting the target year
A Virtual Array Design of 77 GHz Vehicle Radar for Detecting Moving Targets
Kim, Doo-Soo ; Hong, Dong-Hee ; Joo, Jeong-Myeong ; Yang, Jin-Mo ; Lee, Sang-In ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 435~444
DOI : 10.5515/KJKIEES.2015.26.5.435
This paper specifies on a virtual array design of a 77 GHz vehicle radar for detecting a moving target at a time division transmit and a near range. The virtual array designed reduces a hardware complexity, weight and price. However, a synthesized beam of the virtual array has a high side lobe by a phase distortion of receive signals when the moving target is detected at the time division transmit. For this, a subarray receive signal with a same phase is used and the side lobe of the synthesized beam is suppressed above at least 10 dB. Also the virtual array has a beam distortion by a spherical wave when the vehicle radar operates at near range. So a boresight receive signal of each target range is compensated at each receive signal. Therefore the synthesized beam with compensation recovers a normal main lobe and improves the side lobe about 10~15 dB.
Optimal Shape Design of Dual Reflector Antenna Based on Genetic Algorithm
Park, Jung-Geun ; Chung, Young-Seek ; Kang, Won-June ; Shin, Jin-Woo ; So, Joon-Ho ; Cheon, Chang-Yul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 445~454
DOI : 10.5515/KJKIEES.2015.26.5.445
In this paper, we propose an optimal design method for a dual reflector antenna(DRA) using the Genetic algorithm. In order to reduce the computational burden during the optimal design, we exploit the iterative physical optics(IPO) to calculate the surface current distribution at each reflector antenna. To improve the accuracy, we consider the shadow effect by the structure and the coupling effect by the multi-reflection based on the iterative MFIE(Magnetic Field Integral Equation). To reduce the number of design variables and generate a smooth surface, we use the Bezier function with the control points, which become the design variables in this paper. We adopt the HPBW(Half Power Beam Width), the FNBW(First Null Beam Width), and the SLL(Side Lobe Level) as the objective or cost functions. To verify the results, we compare them with the those of the commercial tool.
Inflatable Lifejacket-Integrated Flexible Multiband Antenna
Lim, Ji-Hun ; Yang, Gyu-Sik ; Jung, Sung-Hun ; Park, Dong-Kook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 455~462
DOI : 10.5515/KJKIEES.2015.26.5.455
In this paper, we suggested multiband antenna that can be equipped on a inflatable life-jacket, operating VHF-DSC band(156 MHz), COSPAS-SARSAT band(406 MHz) and GPS band(1,575 MHz) for search and rescue survivors quickly. The GPS band antenna was implemented with a square ring-slot planar antenna, and the COSPAS-SARSAT and VHF-DSC band antenna were implemented meander type dipole antennas. In order to place the antenna on a life-jacket, we installed it on 0.2 mm thickness FR-4 substrate to obtain a flexibility. It appeared that the antenna has -14.6 dB, -30.9 dB, and -18 dB return loss in COSPAS-SARSAT, GPS, and VHF-DSC band, respectively. In addition, its gain has 0.83 dBi, 2.1 dBi in COSPAS-SARSAT and GPS band, respectively.
A Microstrip Dual-Band Band-Pass Filter Using Feed Lines and Resonators with SIR Structures
Lim, Ji-Eun ; Lee, Jae-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 463~470
DOI : 10.5515/KJKIEES.2015.26.5.463
In this paper, a new dual-band bandpass filter(BPF) that has resonators and feed lines with Stepped-Impedance Resonator(SIR) structures is proposed. Feed lines with SIR structure provide maximum magnetic field points which occur at the same locations of the input and output feed lines, so the insertion loss of BPF was reduced. Applying the SIR structure to the BPF for the first passband improves rejection characteristics between the first passband and the second passband. It reduces the coupling between the BPF for the first passband and the BPF for the second passband, so it makes the dual-band BPF more compact. The proposed design method provides independent changes of both the center frequency and the bandwidth for each resonator, and also improves filtering characteristics. The validity of the proposed design method is confirmed by comparisons between the designed parameters and the measured results satisfying WLAN specifications.
A Evaluation of the Maximum Power of the 94 GHz Gunn Diode Based on the Measured Oscillation Power
Lee, Dong-Hyun ; Yeom, Kyung-Whan ; Jung, Myung-Suk ; Chun, Young-Hoon ; Kang, Yeon-Duk ; Han, Ki-Woong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 471~482
DOI : 10.5515/KJKIEES.2015.26.5.471
In this paper, design and implementation of the 94 GHz Gunn oscillator and the evaluation of the maximum power of the Gunn diode used in the oscillator are presented. The 94 GHz Gunn oscillator is used InP Gunn diode and designed employing a WR-10 waveguide. The designed oscillator is fabricated through machining and its performance is measured. The fabricated oscillator shows an oscillation frequency of 95 GHz, output power of 12.64 dBm, and phase noise of -92.7 dBc/Hz at 1 MHz offset frequency. To evaluation the maximum power of the InP Gunn diode used in oscillator, the oscillator structure is modified to a structure having a diaphram. The height of thick diaphram which is used in the oscillator is varied. As a result, an oscillator has several different load impedances, which makes it possible to plot
plot at the post plane. Using the
plot, the maximum power of used Gunn diode including post is computed to be 16.8 dBm. Furthermore using the shorted and zero bias Gunn diode, the post loss used for DC biasing can be computed. Using the two losses, The maximum power of a InP Gunn diode is computed to be 18.55 dBm at 95 GHz. This result is close to a datasheet.
Optimization of Broadband Antenna Parasitic Elements for TACAN
Park, Sang Jin ; Koo, Kyung Heon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 483~491
DOI : 10.5515/KJKIEES.2015.26.5.483
This paper describes the design optimization of parasitic elements used for TACAN broadband antenna. We deployed parasitic elements arranged in a circular array to electronically rotate the antenna instead of employing a mechanically rotated antenna to generate the composite radiation pattern of 15 Hz and 135 Hz including bearing information and to meet the harmonic contents specification of MIL-STD-291C. We performed the simulation for optimization of the parasitic elements and fabricated the antenna composed of 16 parasitic elements of 15 Hz and 63 parasitic elements of 135 Hz. With harmonics magnitude reduction by increasing the number of steps using vector composition of the reflectors, the measured result meets the specification of MIL-STD-291C.
Electromagnetic Susceptibility Analysis of Phase Noise in VCOs
Hwang, Jisoo ; Kim, SoYoung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 492~498
DOI : 10.5515/KJKIEES.2015.26.5.492
As the integration of circuit components increases steadily, various EMS(Electromagnetic Susceptibility) problems have emerged from integrated circuits and electrical systems. The electromagnetic susceptibility of VCOs(Voltage Controlled Oscillator) is especially critical in RF systems. Therefore, in this paper, through the phase noise theory that models electrical oscillators as linear time variant systems, the EMS characteristics of representative VCO -ring VCO and LC VCO- with 1.2 GHz of reference oscillating frequency are analyzed under the existence of the electromagnetic noise coupled in power supply. An simulation algorithm is developed to extract impulse response function based on the phase noise theory. When there is no supply noise, the magnitude of the jitter of two oscillators were similar to around 2.1 ps, but in presence of supply noise, the jitter was significantly lower in LC VCOs than ring VCOs.
Electric Field Effect on Numerical Dosimetry for Wireless Power Transfer System
Park, Sang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 499~505
DOI : 10.5515/KJKIEES.2015.26.5.499
The coupling effect of electric fields incident on the biological object is investigated in regards to dosimetry for a wireless power transfer(WPT) system using electromagnetic resonance phenomenon. The internal electric fields induced a biological sphere model exposed to a magnetic dipole are calculated with the finite-difference time-domain(FDTD) method considering both incident electric and magnetic fields, the impedance method considering only incident magnetic fields, and theoretical analysis. The results represent that the electric coupling effect on a biological object nearby the WPT system should be considered to conduct exact dosimetry.
Ethanol Concentration Sensor Using Microfluidic Metamaterial Absorber
Kim, Hyung Ki ; Yoo, Minyeong ; Lim, Sungjoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 506~513
DOI : 10.5515/KJKIEES.2015.26.5.506
In this paper, we proposed a novel ethanol concentration sensor using microfluidic metamaterial absorber. The metamaterial absorber comprises a split-ring-cross resonator(SRCR) and a microfluidic channel. The SRCR can generate LC resonance that is very sensitive to changes in the effective dielectric constant around the capacitive gap. In addition, microfluidic channels can change the effective dielectric constant of the dielectric substrate by using an infinitesimal quantity of a liquid on the order of microliters. The proposed absorber can detect the electrical properties of different concentration of ethanol. The performance of the proposed absorber is demonstrated using the absorption measurements of a fabricated prototype sample with waveguides. In addition, the simulated results and measurement results show good agreement.
Sidelobe Cancellation Using Difference Channels for Monopulse Processing
Kim, Tae-Hyung ; Choi, Dae-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 514~520
DOI : 10.5515/KJKIEES.2015.26.5.514
Sidelobe canceller(SLC) requires main beam pattern(SUM beam) and auxiliary beam patterns for rejection of sidelobe noise jammer. For best performance of sidelobe noise jamming cancellation of adaptive SLC, gain dominant region of each auxiliary beam pattern shall not be overlapped one another in elevation/azimuth regions of sidelobe of main beam, and beam patterns of auxiliary channels should have low gains in regions of mainlobe of main beam. In the monopulse radar, the difference beam patterns for monopulse processing have these properties. This paper proposes the method using data from the difference channel for monopulse processing as data from auxiliary channel for sidelobe cancellation. For the proposed SLC, the results of simulation and performance analysis was presented. If the proposed method is used in the monopulse radar, SLC can be constructed by using basic SUM and difference channels without extra channel composition.
A Selective Wireless Power Transfer Architecture Using Reconfigurable Multiport Amplifier
Park, Seung Pyo ; Choi, Seung Bum ; Lee, Seung Min ; Lee, Moon-Que ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 5, 2015, Pages 521~524
DOI : 10.5515/KJKIEES.2015.26.5.521
This letter presents a selective wireless power transfer architecture using a reconfigurable multi-port amplifier. The proposed wireless power transfer architecture is composed of a phase shifter part controlled by FPGA, two class-E power amplifiers, a four-port power combiner and two coil loads. Depending on the phase control of FPGA, the power ratio of outputs at the two coil loads becomes 1:1, 2:0 and 0:2. The manufactured system has delivered 1W DC power to loads at 125 kHz. The total DC-to-DC conversion efficiency shows more than 40 % including PA efficiency of 79 %.