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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
Design of an Equivalent Antenna Model for Array Antennas Using Open-Ended Waveguide
Lee, Dongeun ; Byun, Gangil ; Choo, Hosung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 525~532
DOI : 10.5515/KJKIEES.2015.26.6.525
In this paper, we propose an equivalent model of array antennas that use open-ended waveguides for effective EM simulation. We first investigate an individual element that consists of an open-ended waveguide and square ground plane. The waveguide length, aperture size, and ground size of the individual element are adjusted to give a similar radiation pattern to that of the individual element of the original antenna. We then apply the designed equivalent model to two different types of array antennas, such as a microstrip patch array and a waveguide array antenna. Comparison of the simulation results using the equivalent model with the results obtained with the original antenna reveals a difference in gain of less than 0.2 dB and a difference in half power beam width(HPBW) of less than
. The designed equivalent model is then mounted on a simple aircraft, and the simulation results are again compared to results from the original antenna. We find a 60 % reduction in simulation resources and time when compared with the original antenna model.
Design of Reconfigurable Mixer for Microwave Broadband Receiver
Kim, Jae-Hyun ; Jo, Yun-Hyun ; Kim, Sang-Wook ; Go, Min-Ho ; Park, Hyo-Dal ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 533~539
DOI : 10.5515/KJKIEES.2015.26.6.533
In this paper, we designed a reconfigurable mixer for microwave broadband receiver. The proposed mixer using a anti-parallel diode is operated as a fundamental mixer or sub-harmonic mixer with respect to a control voltage. A fundamental mixer with a control voltage show a conversion loss of -10 dB, 1 dB compression point of 2.0 dBm at X-band/ Ku-band. On the other hand, it is performed as a sub-harmonic mixer with a conversion loss of -17 dB, 1 dB compression point of 2.0 dBm at Ka-band.
S-Band Internally-Matched High Efficiency and High Power Amplifier Using GaN HEMT Die
Kim, Sang-Hoon ; Choi, Jin-Joo ; Choi, Gil-Wong ; Kim, Hyoung-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 540~545
DOI : 10.5515/KJKIEES.2015.26.6.540
This paper presents the design, fabrication and measurement results of a S-band internally-matched power amplifier using Gallium Nitride High Electron Mobility Transistor(GaN HEMT) die. In order to fabricate the S-band internally-matched power amplifier, a high dielectric substrate and alumina were used for input/output matching circuits. The measured output power is 55.4 dBm, the drain efficiency is 78 % and the power gain is 11 dB under pulse operation at the frequency of 3 GHz.
Proof-of-Concept Research on Pseudo-Random Noise Radar Using Sequential Sampling Method
Kim, Jihoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 546~554
DOI : 10.5515/KJKIEES.2015.26.6.546
Ultra-wideband(UWB) radar is widely used in many penetration radar applications, such as ground-penetrating radar and foliage-penetrating radar, because it has many advantages in detecting concealed objects. One type of UWB radar system is random noise radar, which many be robust to jamming environment. However conventional random noise radar requires high-speed analog-to-digital convertor(ADC) for matched filtering. In this thesis, a pseudo-random noise radar system that maintains anti-jamming characteristics but does not require high-speed ADC is researched. and The UWB system is implemented in a low frequency system, and its performance has been demonstrated by experiment, which proves the concept of the proposed pseudo-random noise radar system.
Implementation of Signal Processing Algorithms for an FMCW Radar Altimeter
Choi, Jae-Hyun ; Jang, Jong-Hun ; Lee, Jae-Hwan ; Roh, Jin-Eep ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 555~563
DOI : 10.5515/KJKIEES.2015.26.6.555
This paper presents signal processing algorithms of a frequency-modulated continuous-wave(FMCW) radar altimeter and provides a practical assessment technique. The radar altimeter is initially operated in search mode, when the radar altimeter detects a valid altitude, search mode is switched to track mode and a altitude being tracked is displayed. The sweep bandwidth in each mode is a function of altitude to narrow the beat frequency bandwidth. In addition, transmit power and receiver gain in each mode are controlled to compensate for the dynamic range of wide altitude range. To assess more realistic operation, the radar altimeter was tested using the crane setup. The crane test demonstrated that signal processing algorithms described in this paper resulted in a reduced measurement error rate.
3-D Multiple-Input Multiple-Output Interferometric ISAR Imaging
Kang, Byung-Soo ; Bae, Ji-Hoon ; Yang, Eun-Jung ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 564~571
DOI : 10.5515/KJKIEES.2015.26.6.564
In this paper, we propose a multiple-input, multiple-output(MIMO) interferometric radar network system to generate three-dimensional (3-D) MIMO interferometric inverse synthetic aperture radar(InISAR) image. In the MIMO interferometric radar network system, the MIMO InISAR image can be formed by an incoherent summation of multiple bistatic InISAR images that show 3-D scatterers of a target observed at different bistatic interfermetric configurations, respectively. Because bistatic-sccattering physics of a target at different viewpoints are visible in the 3-D MIMO InISAR image, it can provide various scatterering physics properties of a target, and can be used for target classification as a useful feature vector. Simulations validate that our proposed method successfully finds locations of scatterers of a target in MIMO radar interferometric network system.
A Study on the Low Elevation Target Tracking under Multipath Conditions Using Laser Tracking System
Yoo, Seung-Oh ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 572~580
DOI : 10.5515/KJKIEES.2015.26.6.572
RF skin tracking of instrumentation RADAR cannot acquire stable track data, because of effect of multipath interference especially elevation direction. In this paper, low altitude target tracking method using laser tracking system is suggested to overcome this restriction. The effect of multipath can be reduced by increasing angle resolution with laser characteristics of very short pulse and narrow beamwidth. RF skin track, beacon track and laser track data for the integrated calibration target on the ground and target ship on the sea are gathered. And they are compared and analyzed to confirm the performance of laser tracking system. As a result, it shows that the suggested laser track method has better performance than RF skin track under multipath conditions.
A Study on the Setting Procedure of Standard Value and Design Target Value for the RCS Reduced Design for Naval Ships
An, Byeongjun ; Seo, Sangkui ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 581~588
DOI : 10.5515/KJKIEES.2015.26.6.581
In this paper, we researched that setting standard for RSC(Radar Cross Section) of naval surface ship could be determined and considered in various ways on ship's survivability, technical building feasibility, operation and so on. This study presented fundamental capacity on anti-ship missile, radar, flight and so no and the procedure to set of target/standards for RSC. The RCS standards is good at setting low as low as to improve survivability aspect, but because we should consider effect, technical limit, cost etc, this paper analyzed necessary elements to set standard than to suggest specific number and suggested procedure to set standars according to suggest the boundary of RCS.
Test-Bed Implementation for Real-Time Frequency Interference Analysis between Unlicensed Devices
Park, Jin-Soo ; Yoon, Hyun-Goo ; Jang, Byung-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 589~592
DOI : 10.5515/KJKIEES.2015.26.6.589
In this paper, we suggested a real-time test-bed for analyzing frequency interference between 2.4 GHz unlicensed devices, such as WiFi, Zigbee, etc. Owing to versatile programming capability of Universal Software Radio Peripheral(USRP) and
, frequency interference environments can be easily modeled. Therefore, performance degradation effects due to various parameters of interferer and victim receiver can be analyzed intuitively. For verification, we showed a frequency interference scenario, which consists of IEEE 802.15.4 as a victim and IEEE 802.11b as a interferer. Measured Bit Error Rate(BER) results showed good agreement with theory and simulation results.
13.56 MHz High Efficiency Class E Power Amplifier with Low Drain Voltage
Yi, Yearin ; Jeong, Jinho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 6, 2015, Pages 593~596
DOI : 10.5515/KJKIEES.2015.26.6.593
In this paper, we design a high efficiency class E power amplifier operating at low drain bias voltage for wireless power transfers. A 13.56 MHz power amplifier is designed at drain bias voltage of 12.5 V using Si MOSFET with the breakdown voltage of 40 V. High quality-factor solenoidal inductor is designed and fabricated for use in output matching circuit to improve output power and efficiency. Input matching circuit simply consists of resistor and inductor to reduce the circuit area and improve the stability. The fabricated power amplifier shows the measured output power of 38.6 dBm with the gain of 16.6 dB and power added efficiency of 89.3 % at 13.56 MHz.