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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 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
Three Axis Isotropic Field Strength Measuring Antenna
Choi, Suk-Hwan ; Kim, Dong-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 879~885
DOI : 10.5515/KJKIEES.2014.25.9.879
In this paper, we designed and fabricated wideband 3-axis isotropic antenna for the Electro-Magnetic Fields(EMFs) measurement. Each part of proposed 3-axis antenna has isotropic characteristics and arbitrary axis of proposed 3-axis antenna could be selectable using RF switch. Also, a resistor was inserted in each axis of proposed 3-axis antenna for improving antenna gain and noise suppression characteristics, and port impedance of each dipole antenna were matched by balun. For the performance verification of antenna, GTEM Cell which generates standard electromagnetic field was used for the derivation of antenna factor and receiver sensitivity. As a result, fabricated 3-axis isotropic antenna has receiver sensitivity of 0.12~4.2 mV/m and typical VSWR of 3.3:1 within a wide operation frequency range from 0.03 MHz to 3 GHz.
Design of Wideband Bow-Tie Antenna with Folded-Slit Band-Notch Structure
Nam, Hyun-Soo ; Woo, Dong Sik ; Kim, Sung-Kyun ; Kim, In-Bok ; Choi, Hyun-Chul ; Kim, Kang Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 886~894
DOI : 10.5515/KJKIEES.2014.25.9.886
A wideband bow-tie antenna fed by wideband microstrip-coplanar stripline(CPS) balun and band notch structures that can be applied to bow-tie antenna are proposed in this paper. In order to increase bandwidth, bow-tie radiators are reshaped so that the surface current flows continuously, and wideband impedance matching is achieved by adjusting strip width and spacing of CPS feeding line. The VSWR is measured as 2:1 over the wide frequency range of 2.3~12 GHz. The fabricated antenna size is
. In order to achieve the band-notch function at WLAN(5.8 GHz),
away from feeding point are utilized. To minimize the slit size, folded-slit type is adopted. The measured VSWR is 7:1 and gain attenuation is 14 dB at 5.8 GHz.
Design of Two-Stage CMOS Power Amplifier
Bae, Jongsuk ; Ham, Junghyun ; Jung, Haeryun ; Lim, Wonsub ; Jo, Sooho ; Yang, Youngoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 895~902
DOI : 10.5515/KJKIEES.2014.25.9.895
This paper presents a 2-stage CMOS power amplifier for the 1.75 GHz band using a
CMOS process. Using ADS simulation, a power gain of 28 dB and an efficiency of 45 % at an 1dB compression point of 27 dBm were achieved. The implemented CMOS power amplifier delivered an output power of up to 24.8 dBm with a power-added efficiency of 41.3 % and a power gain of 22.9 dB. For a 16-QAM uplink LTE signal, the PA exhibited a power gain of 22.6 dB and an average output power of 23.1 dBm with a PAE of 35.1 % while meeting an ACLR(Adjacent Channel Leakage Ratio) level of -30 dBc.
Improvement of Phase Noise in Frequency Synthesizer with Dual PLL
Kim, Jung-Hoon ; Park, Beom-Jun ; Kim, Jee-Heung ; Lee, Kyu-Song ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 903~911
DOI : 10.5515/KJKIEES.2014.25.9.903
This paper proposes a high speed frequency synthesizer with dual phase-locked loop(PLL) structure to improve phase noise level and shape in a wideband receiver. To reduce phase noise and fractional spur, a output frequency of
PLL used as reference frequency of
PLL is changed. The frequency synthesizer has been designed with 1 Hz frequency resolution using digital NCO in 6.5~8.5 GHz wide spectrum. The measured results of the fabricated frequency synthesizer show that the output power is about -3 dBm, the maximum lock-in time and phase noise are within 60 us and -95 dBc/Hz at 10 kHz offset, respectively.
A VHF Band 4 Channel Phase Discriminator
Park, Beom-Jun ; Lee, Jeong-Hoon ; Lee, Kyu-Song ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 912~918
DOI : 10.5515/KJKIEES.2014.25.9.912
In this paper, a VHF band multi channel phase discriminator for direction finding equipment using tripple baseline interferometer technique is proposed. In order to measure simultaneously phase difference between IF(Intermediate Frequency) signals of the direction finding equipment, phase discriminator was designed to have parallel structure with multi channel, the phase correlator of phase discriminator was designed with I, Q mixer for reducing number of components. And digital LUT(Look Up Table) was applied for compensating error of phase discriminator due to phase unbalance of RF components. The measured phase accuracy of fabricated phase discriminator was 2 degree RMS(Root Mean Square) at 30 dB SNR condition, which is superior to the phase accuracy of conventional product.
Frequency Response Analysis on PCB in Dual Resonant Cavity by Using Stochastical and Topological Modeling
Jung, In-Hwan ; Lee, Jae-Wook ; Lee, Young-Seung ; Kwon, Jong-Hwa ; Cho, Choon-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 919~929
DOI : 10.5515/KJKIEES.2014.25.9.919
In recent, the requirements for the safety to the effects of high power electromagnetic wave have been increased along with the development of electricity and electronic equipments. The small sized electronic devices and the various components have been analyzed by using the full-EM simulation and solving a complete set of Maxwell equation. However, the deterministic approach has a drawback and much limitation in the electromagnetic analysis of an electrically large cavity with a high complexity of the structure. In this paper, statistical theory and topological modeling method are combined to analyze the large cavity with a complex structure. In particular, the PWB(Power Balance) method and BLT(Baum-Liu-Tesche) equation are combined and employed to solve the frequency response to the large-scaled cavity with remarkably reduced time-consumption. For instance, a PCB substrate inside box of box are considered as a large structure with a complexity.
Inverse Synthetic Aperture Radar Imaging Using Stepped Chirp Waveform
Lee, Seong-Hyeon ; Kang, Min-Suk ; Park, Sang-Hong ; Shin, Seung-Yong ; Yang, Eunjung ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 930~937
DOI : 10.5515/KJKIEES.2014.25.9.930
Inverse synthetic aperture radar (ISAR) images can be generated by radar which radiates the electromagnetic wave to a target and receives signal reflected from the target. ISAR images can be widely used to target detection and recognition. This paper proposed a method of generation of high resolution ISAR images by synthesizing frequency spectrums of each stepped chirp waveform in one burst and sub-sampling in frequency domain. This process is performed over entire bursts during coherent processing interval. Conventional ISAR image generation method using stepped frequency waveform has a severe problem of short unambiguous range, loading to ghost phenomenon. However, this problem can be resolved by the proposed method. In simulations, we generate high resolution ISAR image of the moving target which is Boeing-737 aircraft model composed of several ideal point scatterers.
Improved ILDC Formulation for Very Thin Gap/Crack
Lee, Hyunsoo ; Koh, Il-Suek ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 938~943
DOI : 10.5515/KJKIEES.2014.25.9.938
The scattered field by a gap/crack on the PEC surface of a large object having low-observable RCS cannot be negligible, but may not be analyzed by the known high-frequency technique. If the electrical width of the crack is very small, the crack can be modeled by an impedance strip, whose scattering formulation can be analytically obtained based on a low-frequency approximation. The scattering solution is formulated for the 2D strip and TE(Transverse Electric) or TM(Transverse Magnetic) wave incidence, from which a 3D ILDC(Incremental Length Diffraction Coefficients) can be extracted. Using the ILDC formulation, the scattering by any arbitrary shaped crack can be estimated. In this paper, an improved ILDC equations are proposed, which combine the known TE and TM solutions. The improved accuracy of the proposed solution is numerically verified.
A Study of Radio-Wave Interference on Location Selection of Satellite Ground Stations
Yang, Jae Soo ; Bae, Sang Soo ; Hwang, Yu Min ; Kim, Jin Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 944~951
DOI : 10.5515/KJKIEES.2014.25.9.944
In this paper, evaluation indices of the location selection of satellite ground station is proposed to maximize satellite applications. The evaluation index has been developed based on radio-wave environmental conditions to avoid the radio interference to perform the missions of ocean observation satellite. The radio interference investigation was generated based on professionals of satellite control/operation, calibration/validation, applications. And evaluation index was applied to a candidate site of ground station. In the future, this result may be able to compare with the results of other candidate sites for the best location selection of 'marine mission-oriented ground stations'. According to recent trends of mission-oriented ground stations, the results can be used for location selection of 'marine mission-oriented ground station' as reference.
A Study on the ISAR Image Reconstruction Algorithm Using Compressive Sensing Theory under Incomplete RCS Data
Bae, Ji-Hoon ; Kang, Byung-Soo ; Kim, Kyung-Tae ; Yang, Eun-Jung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 9, 2014, Pages 952~958
DOI : 10.5515/KJKIEES.2014.25.9.952
In this paper, we propose a parametric sparse recovery algorithm(SRA) applied to a radar signal model, based on the compressive sensing(CS), for the ISAR(Inverse Synthetic Aperture Radar) image reconstruction from an incomplete radar-cross-section(RCS) data and for the estimation of rotation rate of a target. As the SRA, the iteratively-reweighted-least-square(IRLS) is combined with the radar signal model including chirp components with unknown chirp rate in the cross-range direction. In addition, the particle swarm optimization(PSO) technique is considered for searching correct parameters related to the rotation rate. Therefore, the parametric SRA based on the IRLS can reconstruct ISAR image and estimate the rotation rate of a target efficiently, although there exists missing data in observed RCS data samples. The performance of the proposed method in terms of image entropy is also compared with that of the traditional interpolation methods for the incomplete RCS data.