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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 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
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Frequency Characteristics of the Return Loss of a Broadband Double-Cone Antenna with Shorting Plate
Jang, Seung-Hoon ; Hong, Deok-Gi ; Kim, Hyo-gyun ; Jung, Sung-Woo ; Kim, Ki-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 101~107
DOI : 10.5515/KJKIEES.2016.27.2.101
This paper presents the characteristics of a double-cone broadband antenna with compact and three-dimensional structure that can be used in UWB system. The theoretical analysis is conducted using a finite difference time domain(FDTD) method. The parameters are the radius, a height of broadband double-cone antennas with shorting plate, and the number of plates on a ground plane. This paper examines influence of structural parameters on return loss. The results show that a condition for an optimum structure of broadband double-cone antennas with shorting plate exists. It also shows that the broadband double-cone antennas with shorting plate have radiation patterns similar to those of a dipole antenna. To verify the theoretical analysis, computed results are compared to experimental results.
Design of a 2.6 GHz GaN-HEMT Doherty Power Amplifier IC for Small-Cell Base Station Systems
Lee, Hwiseob ; Lim, Wonseob ; Kang, Hyunuk ; Lee, Wooseok ; Lee, Hyoungjun ; Yoon, Jeongsang ; Lee, Dongwoo ; Yang, Youngoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 108~114
DOI : 10.5515/KJKIEES.2016.27.2.108
This paper presents a 2.6 GHz Doherty power amplifier IC to enhance the back-off efficiency. In order to apply to small-cell base stations, the Doherty power amplifier was fabricated using GaN-HEMT process for high power density. In addition, the implemented Doherty power amplifier was mounted on a QFN package. The implemented GaN-HEMT Doherty power amplifier was measured using LTE downlink signal with 10 MHz bandwidth and 6.5 dB PAPR for verification. A power gain of 15.8 dB, a drain efficiency of 43.0 %, and an ACLR of -30.0 dBc were obtained at an average output power level of 33.9 dBm.
Implementation of Wideband Low Noise Down-Converter for Ku-Band Digital Satellite Broadcasting
Hong, Do-Hyeong ; Lee, Kyung Bo ; Rhee, Young-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 115~122
DOI : 10.5515/KJKIEES.2016.27.2.115
In this paper, wideband Ku-band downconverter was designed to receiver digital satellite broadcasting. The low-nose downconverter was designed to form four local oscillator frequencies(9.75, 10, 10.75 and 11.3 GHz) representing a low phase noise due to VCO-PLL with respect to input signals of 10.7 to 12.75 GHz and 3-stage low noise amplifier circuit by broadband noise matching, and to select intermediate frequency bands by digital control. The developed low-noise downconverter exhibited the full conversion gain of 64 dB, and the noise figure of low-noise amplifier was 0.7 dB, the P1dB of output signal 15 dBm, and the phase noise -85 dBc@10kHz at the band 1 carrier frequency of 9.75 GHz. The low noise block downconverter(LNB) for wideband digital satellite broadcasting designed in this paper can be used for global satellite broadcasting LNB.
Flexible Microfluidic Metamaterial Absorber for Remote Chemical Sensor Application
Kim, Hyung Ki ; Lim, Sungjoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 123~130
DOI : 10.5515/KJKIEES.2016.27.2.123
In this paper, a novel flexible microfluidic metamaterial absorber is proposed for remote chemical sensor applications. The proposed metamaterial absorber consists of a periodic of split-ring-cross resonators(SRCRs) and a microfluidic channel. The SRCR patterns are inkjet-printed using silver nanoparticle inks on paper. The microfluidic channels are laser-etched on polydimethylsiloxane(PDMS) material. The proposed absorber can detect change of the effective permittivity at different liquids. Therefore, the absorber can be used for a remote chemical sensor by detecting change of the resonant frequencies. The performance of the proposed absorber is demonstrated with full-wave simulation and measurement results. The experimental results shows that the resonant frequency is 10.49 GHz at the empty channel. When ethanol and DI-water are injected into the channel, the resonant frequencies are 10.04 GHz and 8.9 GHz, respectively.
Laboratory Experiments of a Ground-Penetrating Radar for Detecting Subsurface Cavities in the Vicinity of a Buried Pipe
Hyun, Seung-Yeup ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 131~137
DOI : 10.5515/KJKIEES.2016.27.2.131
In this paper, a feasibility on a ground-penetrating radar for detecting subsurface cavities near buried pipes has been investigated. The experimental setup was implemented by employing an impulse ground-penetrating radar system, a xy Cartesian coordinate robot, an underground material filled tank, a metal pipe and a simulated cavity model. In particular, the simulated cavity model was constructed by packing Styrofoam chips and balls, which have both similar electrical properties to an air-filled cavity and a solid shape. Through typical three experiments, B-scan data of the radar have been acquired and displayed as 2-D gray-scale images. According to the comparison of B-scan images, we show that the subsurface cavities near the buried pipes can be detected by using the radar survey.
Beam Forming Study and Optimum Antenna Location Selection for Wideband Conformal Array Antenna
Jung, Sang-Hoon ; Lee, Kang-In ; Nam, Sang-Wook ; Chung, Young-Seek ; Yoon, Young-Joong ; Ryu, Hong-Kyun ; Jung, Hyun-Kyo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 138~146
DOI : 10.5515/KJKIEES.2016.27.2.138
This paper proposes an optimum beam forming of conformal array antenna by using LSM(Least Squares Method) and GA(Genetic Algorithm). The weights which approximate conformal array antenna beam pattern to linear array antenna beam pattern have been evaluated by applying LSM. Also, the optimum locations of conformal array antenna which form wideband optimum beam pattern have been obtained by using GA. The proposed method is applied to a problem of Bezier platform array antenna for a verification purpose.
Jamming Detection and Suppression Algorithm for an FMCW Radar Altimeter
Lee, Jae-Hwan ; Jang, Jong-Hun ; Roh, Jin-Eep ; Yoo, Kyung-Ju ; Choi, Jae-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 147~155
DOI : 10.5515/KJKIEES.2016.27.2.147
This paper presents a jamming detection and suppression algorithm of a frequency-modulated continuous-wave(FMCW) radar altimeter. The radar altimeter measures the noise level at the noise measuring period before the transmitting and receiving period and finds the number of sampled noise data over the jamming threshold for detecting the jamming. For a jamming suppression technique, we design the time domain jamming suppression, transmit/receive power control and frequency hopping methods. To assess more realistic operation, the radar altimeter was performed a field test. Through the field test, we verified the algorithms successfully.
Orthogonally-Polarized Dual-Band Switchable Microstrip Antenna Using PIN-Diode Loaded H-Shape Slot
Lim, Eunsook ; Pyo, Seongmin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 156~162
DOI : 10.5515/KJKIEES.2016.27.2.156
This paper proposes a novel orthogonally-polarized dual-band switchable microstrip antenna. The proposed antenna consists of a perpendicular feeding network and an radiator with a PIN-installed H-shaped slot. When the states of one single PIN diode in H-slot are controlled by bias voltages, the controlled physical geometry of the H-slot determines the operation frequencies of switchable 1.80 GHz and 2.43 GHz for vertically polarized linear polarization and fixed 2.06 GHz for horizontally linear polarization. The implemented antenna experimentally demonstrates reconfigurable dual-band capability by means of controling the states of the PIN diode. The simulation and measurement results of the implemented antenna have been in good agreement with the reflection coefficients, realized antenna gains and far-field radiation patterns at each of the PIN diode states.
The Design of Resonator for Miniaturization of Magnetic Resonance Wireless Power Transfer System
Kang, Seok Hyon ; Jung, Chang Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 163~169
DOI : 10.5515/KJKIEES.2016.27.2.163
In this paper, we miniaturized the loop and coil in magnetic resonance wireless power transfer(MR-WPT) system for application to the small mobile device. The proposed disk type double coil resonator was designed to cause resonance at 6.87 MHz. It is composed of thin copper on both-side of acrylic substrate structured 2 mm width, 1 mm pitch and 8 turns. The outer radius of spiral coil pattern is 9 cm. And the proposed loop was made of the copper wire 5 mm diameter of cross-section. The size of loop is 10 cm diameter. For resonance at 6.87 MHz, the capacitor with 3,300 pF was connected in series on the loop. We rearranged the resonators and organized several WPT systems which is rearranged by resonators. The highest transfer efficiency of miniaturized WPT system was 35.67 %. This proposed design of spiral double coil will contribute to make resonator smaller for appling small and thin mobile device.
Analysis of Input/Output Transfer Characteristic to Transmit Modulated Signals through a Dynamic Frequency Divider
Ryu, Sungheon ; Park, Youngcheol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 170~175
DOI : 10.5515/KJKIEES.2016.27.2.170
In order to transmit baseband signals through frequency dividing devices, we studied the transfer function of the device in the term of the baseband signal distortion. From the analysis, it is shown that the magnitude of the envelope signal is related to the mixer gain and the insertion loss of the low pass filter whilst the phase is the additional function with the 1/2 of the phase delay. For the purpose of the verification of the study, we designed a dynamic frequency divider at 1,400 MHz. The operating frequency range of the device is closely related to the conversion gain of mixers and the amplitude of input signal, and becomes wide as the conversion gain of mixers increases. The designed frequency divider operates between 0.9 GHz and 3.2 GHz, for -14.5 dBm input power. The circuit shows 20 mW power dissipation at
, and the simulation result shows that an amplitude modulated signal at 1,400 MHz with the modulation index of 0.9 was successfully downconverted to 700 MHz.
Development of Real-Time Generation Methods of Simulated Surface Clutter Signals for Airborne Radar
Kim, Tae-Hyung ; Moon, Hyun-Wook ; Lee, Sung-Won ; Ryu, Seong-Hyun ; Yang, Eunjung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 176~187
DOI : 10.5515/KJKIEES.2016.27.2.176
It takes considerable time to generate accurate clutter signal using conventional clutter generation scheme. In this paper, real-time schemes are proposed, which have reasonable accuracy and are applicable to testing the radar performance. Proposed methods are compared through the simulation, which represented that clutter signal can be generated in real-time when using proposed methods for simulated signal generator.
Mathematical Modeling of Wave Propagation Considering the Atmospheric Effects and Its Application
Lee, Taeseung ; Choi, Sanghyouk ; Chun, Joohwan ; Kang, Seongcheol ; Park, Dongmin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 188~197
DOI : 10.5515/KJKIEES.2016.27.2.188
In this paper, we propose a method that represents a mathematical form of wave propagation by using the fact the refractive index determining wave propagation characteristic is a function of altitude. Proposed method uses Snell's law that expresses relationship between incident angle and refraction angle when incident wave passes medium having a different refractive index. We present the simulation results about wave propagation by setting the square of refractive index in the form of the polynomial for altitude and show that it is possible to estimate the coefficients of the polynomial through the angle information from vertical axis of multiple radar systems.
Analysis of Target Identification Performances against the Moving Targets Using a Bistatic Radar
Lee, Seung-Jae ; Bae, Ji-Hoon ; Jeong, Seong-Jae ; Yang, Eunjung ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 198~207
DOI : 10.5515/KJKIEES.2016.27.2.198
Bistatric radar can perform detection and identification for stealth targets that are rarely detected by the conventional monostatic radar. However, high resolution range profile(HRRP) generated from the received signal in the bistatic radar cannot show exact range information of the target because the bistatic geometry lead to the distortions of the bistatic HRRP. In addition, electromagnetic scattering mechanisms of the target are varied depending on the bistatic geometry. Thus, efficient database construction is a crucial factor to achieve successful classification capability in bistatic target identification. In this paper, a database construction method based on realistic flight scenarios of a target, which provides a reliable identification performance for the monostatic radar, is applied to bistatic target identification. Then, the capability and efficiency of the method is analyzed. Simulation results show that reliable identification performance can be achieved using the database construction based on the flight scenarios when the target is a considerable distance away from the bistatic radar.
Feasibility Study for Device-to-Device Communications Using Unlicensed Bands in a Cellular Network
Kim, Hyeon-Min ; Kang, Gil-Mo ; Shin, Oh-Soon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 208~211
DOI : 10.5515/KJKIEES.2016.27.2.208
Device-to-Device communication(D2D) enables devices in proximity to communicate directly without going through the network infrastructure. In particular, D2D communications in a cellular network can improve the spectral efficiency by allowing the reuse of cellular resources. However, it is not easy to maintain the channel quality of the D2D links and to protect the cellular links from the D2D interferences, since the resource allocations for the cellular users will change with time due to the time-varying nature of the cellular channels. To mitigate the performance degradation of D2D links, we propose to exploit unlicensed bands as auxiliary resources when the D2D links share the uplink cellular resources. The effectiveness of the proposed scheme is verified through simulations.
Power Consumption Change in Transistor Ratio of Ring Voltage Controlled Oscillator
Moon, Dongwoo ; Shin, Hooyoung ; Lee, Milim ; Kang, Inseong ; Lee, Changhyun ; Park, Changkun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 212~215
DOI : 10.5515/KJKIEES.2016.27.2.212
In this paper, a 5.08 GHz Ring Voltage Controlled Oscillator(Ring VCO) was implemented using
standard CMOS technology. The proposal Ring VCO is 3-stage structure. This research confirmed that the each stage's different transistor size ratio influence the current change and alter power consumption consequentially. This circuit is formed to control the current thereby adding the Current Mirror and to tune the frequency by supplying control voltage. It has an 65.5 %(1.88~5.45 GHz) tuning range. The measured output power is -0.30 dBm. The phase noise is -87.50 dBc/Hz @1 MHz offset with operating frequency of 5.08 GHz fundamental frequency. The total power consumption of Ring VCO is 31.2 mW with 2.4 V supply voltage.
SIW-Based Linearly Polarized S-Band Antenna for SDR
Han, Jun-Yong ; Yoon, Seong-Sik ; Lee, Jae-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 216~219
DOI : 10.5515/KJKIEES.2016.27.2.216
In this paper, the SIW(Substrate Integrated Waveguide)-based feeding antenna for the application of SDR(Software Defined Radar) is designed and manufactured. It is usually well-known that SIWs are easily integrated on PCB and have low transmission loss toward high powered input signal. Also, it is recommended that SIWs are strongly immunized to Electromagnetic Interferences(EMI). In particular, the manufactured antennas are loaded on the USRP(Universal Software Radio Peripheral) platform and employed to detect target RCS as an experiment in this paper. The operating frequency of the proposed antenna is in ISM(Industrial, Scientific and Medical) band(2.4~2.48 GHz) and the measured gain is over 8 dBi at 2.44 GHz.
A High Linearity Low Noise Amplifier Using Modified Cascode Structure
Park, Seung Pyo ; Eu, Kyoung Jun ; No, Seung Chang ; Lee, Moon-Que ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 220~223
DOI : 10.5515/KJKIEES.2016.27.2.220
This letter proposes a low noise amplifier which has low noise figure and high linearity simultaneously using a cascode structure with an additional transistor. The proposed structure minimizes the noise source by using optimizing transistor sizes and also improves linearity from the current bleeding technique. The device was fabricated in a
GaAs pHEMT process and has noise figure of 1.1 dB, a voltage gain of 15.0 dB, an
of 30.8 dBm and an input/output return loss of 11.6 dB/10.4 dB from 1.8 to 2.6 GHz.
A Design of Wideband Monopulse Comparator for W-Band mm-Wave Seeker Applications
Kim, Dong-Yeon ; Lim, Youngjoon ; Jung, Chae-Hyun ; Park, Chang-Hyun ; Nam, Sangwook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 2, 2016, Pages 224~227
DOI : 10.5515/KJKIEES.2016.27.2.224
This paper proposes a design of W-band mm-wave wideband monopulse comparator using waveguide structure for applications. The main idea of proposed design is to combine a self-compensating phase shifter on
hybrid for wideband
hybrid. Using multiple conventional phase shifters, because of their narrow-band characteristics, tends to restrict working bandwidth of system including antennas. Proposed comparator could relieve the problem since it applies the self-compensating phase shifter. The comparator has waveguide structure so it shows excellent characteristic in loss. It also show wideband characteristic in amplitude and phase response between ports.