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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 27, Issue 8 - Sep 2016
Volume 27, Issue 7 - Aug 2016
Volume 27, Issue 6 - Jul 2016
Volume 27, Issue 5 - Jun 2016
Volume 27, Issue 4 - Apr 2016
Volume 27, Issue 3 - Mar 2016
Volume 27, Issue 2 - Feb 2016
Volume 27, Issue 1 - Jan 2016
Selecting the target year
A Study on an Improvement Scheme of ISM Management Regulation
Park, Yeon-Gyu ; Cho, Hyun-Mook ; Lee, Il-Kyoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 581~587
DOI : 10.5515/KJKIEES.2016.27.7.581
Recently, ISM(Industrial, Scientific and Medical) equipments that exceed 50 watts were expended at home, medical institutions and industrial sites. Therefore, the equipments that are subject to permission have been significantly increased. So, the present permission system that individually permits each equipment and inspects all equipments has a limitation. Thus, it is also difficult to reflect the environmental changes. In this paper, we reviewed the ISM management system in major foreign countries and domestic, and then proposed an improvement scheme of ISM management system for domestic environment. These results will be useful for revitalization of domestic industry related to ISM equipment and an efficient management of ISM equipments in the future.
A Promoting Policy Direction of Radio Industry by Ecosystem Analysis
Park, Seok-Ji ; Park, Duk-Kyu ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 588~598
DOI : 10.5515/KJKIEES.2016.27.7.588
In this paper, we studied a policy direction for promoting radio industry by analyzing the ecosystem. For this, we drew the growing structure and mechanism of radio industries according to wireless technology and service development. We suggested policy elements for radio industry promotion, which is composed of technology development, service development, advancement of law and regulations, business model development, assistance of production and use, publicity enforcement for promotion. The concept and radio industry sector practices of the ecosystem analysis are analyzed by survey of experts. From this result, the 5 policy options are proposed.
Study on Cognitive Engine Platform Based on the Spectrum Sharing for the Military Tactical Communications
Choi, Joo-Pyoung ; Lee, Won-Cheol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 599~611
DOI : 10.5515/KJKIEES.2016.27.7.599
This paper proposes a cognitive engine platform that enables dynamic spectrum access(DSA) based on a spectrum sharing system for the military tactical network environment. The current military tactical wireless communication system is increasing need to secure a supplementary wireless spectrum to ensure that multiple wireless networks for different weapon systems co-exist, so that tactical wireless communication between the same or different systems can be operated effectively. This paper examined policy development and research activities engaged by the U.S. and European countries on wireless spectrum sharing to secure more spectrum. It also introduces the current status of cognitive engine development, which is the core technology of tactical wireless communication for DSA. In addition, based on the investigation performed into the latest trends, we propose a platform structure for a cognitive engine based on a spectrum sharing method where more frequencies can be added for tactical radio communication, so that DSA can be realized, and wireless networks of different weapon systems can co-exist.
Design of the Dual-Band Electrical Beam Tilting Array Antenna with Bi-Directional Directivity
Jeon, Hoo-Dong ; Heo, Soo-Young ; Ko, Ji-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 612~619
DOI : 10.5515/KJKIEES.2016.27.7.612
In this paper, a dual band electrical beam tilting array antenna with bi-directional directivity is designed. Radiating element operates at dual-resonance frequencies and is designed as planar dipole using PCB. In order to tilt the main beam, the phase delay line is designed by use of only the phase shifting line of a
microstrip line for broadband. The designed antenna has tilting angle of
. For validation of the designed antenna specification, the array antenna is fabricated and the performances are measured. Comparison between theory and experiment shows good agreement.
Analysis of Distortion Characteristic of Amplitude Modulated Signal through a Current-Mode-Logic Frequency Divider
Kim, Hyeok ; Park, Youngcheol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 620~624
DOI : 10.5515/KJKIEES.2016.27.7.620
In this paper we designed a current mode logic frequency divider to transmit a baseband amplitude modulated signal. From simulation result, we studied input and output waveforms according to the variation of input bias voltage. For the purpose of the verification of the study, we designed a current mode logic frequency divider at 1,400 MHz. The designed frequency divider operates between 100 MHz and 3,000 MHz, for -33 dBm input power. The circuit draws
supply, and the simulation result shows that an amplitude modulated signal at 1,400 MHz with the modulation index of 0.5 was successfully downconverted to 700 MHz.
Near-Field Receiving Measurement of Active Phased Array Antenna for Full Digital Radar Application
Chae, Heeduck ; Lee, Jae-Min ; Kim, Young-Wan ; Kim, HanSaeng ; Jin, Hyoung Seog ; Park, Jongkuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 625~634
DOI : 10.5515/KJKIEES.2016.27.7.625
A full digital receiving active phased array antenna generates final receiving beams by digital beam forming of received digital signals in element-level that makes difficult to use typical near-field measurement method. Thus in this paper, a modified near-field measurement method which is suitable for full digital receiving active phased array antenna is proposed. Also the measured results of receiving beam pattern and G/T using developed L-band full digital receiving active phased array antenna are shown for the verification of proposed method.
Improvement of Phase Noise for Oscillator Using Frequency Locked Loop
Kim, Wook-Lae ; Lee, Chang-Dae ; Kim, Yong-Nam ; Im, Pyung-Soon ; Lee, Dong-Hyun ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 635~645
DOI : 10.5515/KJKIEES.2016.27.7.635
In this paper, we showed the phase noise of voltage controlled oscillator(VCO) can be radically improved using FLL(Frequency Locked Loop). At first, a 5 GHz VCO is fabricated using a hair-pin resonator. The fabricated VCO shows a phase noise of -53.1 dBc/Hz at 1 kHz frequency offset. In order to improve the phase noise of the fabricated VCO, a FLL is constructed using the feedback loop that consists of the VCO, a frequency detector composed of 5 GHz resonator, loop-filter, and level shifter. The fabricated FLL is designed to oscillate at a frequency of 5 GHz, and its measured phase noise is about -120.6 dBc/Hz at 1 kHz offset frequency. As a result, the phase noise of VCO can be radically improved by about 67.5 dB applying FLL. In addition, the measured phase noise performance is close to that of crystal oscillator.
2D Microwave Image Reconstruction of Breast Cancer Detection for Breast Types
Kim, Ki-Chai ; Kim, Tae-Hong ; Lee, Jong-Moon ; Jeon, Soon-Ik ; Pack, Jeong-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 646~652
DOI : 10.5515/KJKIEES.2016.27.7.646
This paper presents a tumor detection for breast cancer that utilizes two-dimensional(2D) image reconstruction with microwave tomographic imaging. The breast cancer detection system under development consists of 16 transmit/receive antennas, and the microwave tomography system operates at 1,700 MHz. The four types of breast(ED-, HD-, SC-, and FT-type) are used for image reconstruction. To solve a 2D inverse scattering problem, the method of moments(MoM) is employed for forward problem solving, and the simplex method employed as an optimization algorithm. The results of the reconstructed image show that the ED- and HD-types of breasts are well reconstructed, but SC- and FT-type breasts are not well because of the error including.
Design of an Ultra-Wideband LPDA Antenna for the Feeder of an Airborne Spinning Direction-Finding Reflector Antenna
Park, Young-Ju ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 653~659
DOI : 10.5515/KJKIEES.2016.27.7.653
This paper proposes an ultra-wideband Log-Periodic Dipole Array(LPDA) antenna for the feeder of a reflector antenna to be used for airborne spinning direction-finding and detecting wideband signals. To obtain the ultra-wideband characteristics over the 20:1 bandwidth from S to Ka band, the radiation elements of the antenna were printed on a substrate and a wedge-typed dielectric supporter with robust structure was inserted between the substrates. Also, the center portion of the supporter was replaced by a styrofoam material to reduce the supporter weight. The 5-dB return loss of the designed LPDA antenna showed ultra-wideband characteristics, which are 37.57:1(1.09~40.95 GHz) in the simulation and 33.85:1(1.31~44.35 GHz) in the measurement. We achieved the required gains of 5.78 dBi in the simulation and 5.76 dBi in the measurement in the operating band. The proposed robust, light-weight, and ultra-wideband LPDA antenna confirmed that it can be applied for airborne applications.
Effect of Vegetation Layers on Soil Moisture Measurement Using Radars
Park, Sinmyong ; Oh, Yisok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 7, 2016, Pages 660~663
DOI : 10.5515/KJKIEES.2016.27.7.660
This paper presents the effect of vegetation layer and radar parameters on soil moisture measurement using the vegetation layer scattering model and surface scattering model. The database of backscattering coefficients for various vegetation layer densities, incidence angles, frequencies, and polarizations is generated using
-order RTM(Radiative Transfer Model). Then, surface soil moisture contents were estimated from the backscattering coefficients in the database using the WCM(Water Cloud Model) and Oh model. The retrieved soil moisture contents were compared with the soil moisture contents in the input parameters of the RTM to estimate the retrieval errors. The effects of vegetation layer and radar parameters on soil moisture measurement are analyzed using the retrieval errors.