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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 24, Issue 12 - Dec 2013
Volume 24, Issue 11 - Nov 2013
Volume 24, Issue 10 - Oct 2013
Volume 24, Issue 9 - Sep 2013
Volume 24, Issue 8 - Aug 2013
Volume 24, Issue 7 - Jul 2013
Volume 24, Issue 6 - Jun 2013
Volume 24, Issue 5 - May 2013
Volume 24, Issue 4 - Apr 2013
Volume 24, Issue 3 - Mar 2013
Volume 24, Issue 2 - Feb 2013
Volume 24, Issue 1 - Jan 2013
Selecting the target year
A Method of Prediction and Analysis of Electromagnetic Interference (EMI) in Wireless Power Transfer System Operating at 13.56 MHz
Shim, Hyun-Jin ; Park, Jong-Min ; Nam, Sangwook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 873~882
DOI : 10.5515/KJKIEES.2013.24.9.873
The effective way of estimation and analysis of EMI(Electromagnetic Interference) in Wireless Power Transfer System operating at 13.56 MHz is proposed. In this paper methodology of driving magnetic field strength and electric loop current of two antennas which are in free space and on PEC plane using image theory and duality is proposed. Perfect electric conductor(PEC) is planar, infinite in extent, and perfectly conducting plane. And we will refer it as PEC plane. A equivalent circuit model is used to analyze. Using this theoretical analysis, we can derive maximum magnetic field strength of the far-field region numerically using measured data of near-field maximum magnetic field strength. The experimental results using commercial numerical simulation tool are in agreement with the theoretical results. Also, using the derivation of maximum magnetic field strength in the far-field region, we can easily estimate the maximum allowable power dissipation that meets EMI regulations.
Received Power Regulation of LF-Band Wireless Power Transfer System Using Bias Control of Class E Amplifier
Son, Yong-Ho ; Han, Sang-Kyoo ; Jang, Byung-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 883~891
DOI : 10.5515/KJKIEES.2013.24.9.883
In wireless smart phone charging scenario, the transmitter pad is larger than the size of the receiver pad. Thus, it is important to supply a constant power to the receiver regardless of its location. In this paper, we propose a new method to regulate the receiver`s power by adjusting a drain bias of class E power amplifier. The proposed LF-band wireless power transfer system is as follows: a buck converter power supply which is controlled by a pulse width modulation(PWM) IC TL494, a class E amplifier using a low cost IRF510 power MOSFET, a transmitter coil whose dimension is
, a receiver coil whose dimension is
, and a full bridge rectifier using Schottky diodes. A measured performance show a maximum output power of 4 W and system efficiency of 67 % if we fix the bias voltage. If we adjust the bias voltage, the received power can be maintained at a constant power of 2 W regardless of receiver pad location.
Precise Measurements of Waveguide Scattering Parameters in G-Band
Kang, Jin-Seob ; Kim, Jeong-Hwan ; Cho, Chihyun ; Kim, Dae-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 892~899
DOI : 10.5515/KJKIEES.2013.24.9.892
This paper discusses difficulties in precise measurements of the scattering parameters in (sub-)millimeter-wave range and tips for more accurate measurements, and provides measurement examples in the G-band(140~220 GHz). First, one investigates the differences in operating principles of scattering parameters measurement systems used in microwave and (sub-)millimeter-wave ranges and describes tips for better operation of the (sub-)millimeter-wave scattering parameters measurement system. In addition, one describes tips for better transmission properties and connection repeatability of waveguides and a precise measurement method for devices with small reflection coefficients.
Development of a L-Band Microwave Radiometer for Remote Sensing of Water Surface Salinity
Son, Hong-Min ; Youn, Jeong-Beam ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 900~907
DOI : 10.5515/KJKIEES.2013.24.9.900
The development processes of a L-band microwave radiometer for remote sensing of water surface salinity are described in this paper. Achieving the development aim of the measurement accuracy within 2 psu for water surface salinity of 0~40 psu, the requirements and specifications of the microwave radiometer and its receiver are drawn. The receiver with high gain, high sensitivity is designed and implemented to satisfy these requirements and specifications. The receiver has the bandwidth of 45 MHz, the system gain of 47 dB and the sensitivity of 0.41 K at 1,390 MHz. The effectiveness of the developed L-band microwave radiometer for remote sensing of water surface salinity is demonstrated experimentally. The results show the microwave radiometer can detect water surface salinity for 10~28 psu within the accuracy of 1.4 psu.
Design of the Shaped Cassegrain Antenna Considering the Excited Power Function
Kong, Ki-Bok ; Kim, Jong-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 908~914
DOI : 10.5515/KJKIEES.2013.24.9.908
A shaped Cassegrain antenna is designed from the condition of the same path length at the equi-phase surface by using the conservation of energy and Snell`s law. In order to improve the phase error efficiency of aperture surface, the surface profile of the main and sub-reflectors is found to satisfy the power distribution and the equi-phase condition at the aperture surface. The sidelobe levels of 36.4 dB and 33.9 dB are achieved at the AZ and EL planes, respectively from numerical calculation by physical optics method at Ku band and the directivity of designed antenna is 10 percent greater than that of conventional antenna.
A Design of 77 GHz LNA Using 65 nm CMOS Process
Kim, Jun-Young ; Kim, Seong-Kyun ; Cui, Chenglin ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 915~921
DOI : 10.5515/KJKIEES.2013.24.9.915
This work presents a 77 GHz low noise amplifier(LNA) for automotive radar systems using 65 nm RF CMOS process. The LNA is composed of three stage common source amplifiers and includes transmission line matching networks. To reduce the time for three dimensional EM simulation, we optimize the transmission line impedance matching network using a pre-built EM library. The proposed compact simulation technique is confirmed by measurement results. The peak gain of the LNA is 10 dB at 77 GHz and input/output return losses are below -10 dB around the design frequency.
BER Performance of Spatial Modulation in Uplink Multi-User Environment
Kim, Jin Kwan ; Hyun, Kwangmin ; Park, Sang Kyu ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 922~927
DOI : 10.5515/KJKIEES.2013.24.9.922
In this paper, we evaluate the performance of up-link multi-user MIMO systems with SM. The receiver demodulates the received signal using ML method determines the signal which seems to be the most probable after comparing the received signal and all transmitted signal candidates. When transmitting with the same data rate, the SM method shows better performance of bit error rate(BER) than that of the space shift keying(SSK) of the previously proposed multi-user system.
Study on the Performance Enhancement of Radar Target Recognition Using Combining of Feature Vectors
Lee, Seung-Jae ; Choi, In-Sik ; Chae, Dae-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 928~935
DOI : 10.5515/KJKIEES.2013.24.9.928
This paper proposed a combining technique of feature vectors which improves the performance of radar target recognition. The proposed method obtains more information than monostatic or bistatic case by combining extracted feature vectors from two receivers. For verifying the performance of the proposed method, we calculated monostatic and bistatic RCS(BRCS) of three full-scale fighters by changing the receiver position. Then, the scattering centers are extracted using 1-D FFT-based CLEAN from the calculated RCS data. Scattering centers are used as feature vectors for neural network classifier. The results show that our method has the better performance than the monostatic or bistatic case.
Design of 77 GHz Automotive Radar System
Nam, Hyeong-Ki ; Kang, Hyun-Sang ; Song, Ui-Jong ; Cui, Chenglin ; Kim, Seong-Kyun ; Nam, Sang-Wook ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 936~943
DOI : 10.5515/KJKIEES.2013.24.9.936
This work presents the design and measured results of the single channel automotive radar system for 76.5~77 GHz long range FMCW radar applications. The transmitter uses a commercial GaAs monolithic microwave integrated circuit(MMIC) and the receiver uses the down converter designed using 65 nm CMOS process. The output power of the transmitter is 10 dBm. The down converter chip can operate at low LO power as -8 dBm which is easily supplied from the transmitter output using a coupled line coupler. All MMICs are mounted on an aluminum jig which embeds the WR-10 waveguide. A microstrip to waveguide transition is designed to feed the embedded waveguide and finally high gain horn antennas. The overall size of the fabricated radar system is
. The radar system achieved an output power of 10 dBm, phase noise of -94 dBc/Hz at 1 MHz offset and a conversion gain of 12 dB.
A Study on the Detection of the Rain Using Open-Ended Coaxial Cavity Resonator
Lee, Yun-Min ; Kim, Jin-Kuk ; Hur, Jung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 9, 2013, Pages 944~950
DOI : 10.5515/KJKIEES.2013.24.9.944
This paper is a study of a rain sensor using an open-ended coaxial cavity resonator which senses the amount of rain drops linearly. It shows that it will be used as a sensor to sense the amount of rain dropped on the windshield of an automobile based on the principle of varied resonant frequency and the loss according to the amount and characteristics of an dielectric lied on the open side of a resonator. The input and output ports are built in the both sides of the resonator and the input and output coupling probes are formed like `ㄱ` shape. The response of rain drops were simulated by the radius of inner conductor of 2 mm, 5 mm, and 10 mm respectively and it showed that the raindrop was sensed most linearly and sensitively when the radius of inner conductor is 5 mm, We have measured that the resonant frequency have varied from 3.55 GHz to 3 GHz and the Q value have varied from 42.38 to 24.3 according to the variation of rain drop amount on the fabricated resonator. Therefore, it shows that the designed resonator can be applied as a rain sensor that measures the amount of rain drops linearly by using the resonant frequency as a measurement parameter.