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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 21, Issue 12 - Dec 2010
Volume 21, Issue 11 - Nov 2010
Volume 21, Issue 10 - Oct 2010
Volume 21, Issue 9 - Sep 2010
Volume 21, Issue 8 - Aug 2010
Volume 21, Issue 7 - Jul 2010
Volume 21, Issue 6 - Jun 2010
Volume 21, Issue 5 - May 2010
Volume 21, Issue 4 - Apr 2010
Volume 21, Issue 3 - Mar 2010
Volume 21, Issue 2 - Feb 2010
Volume 21, Issue 1 - Jan 2010
Selecting the target year
Thermal Steady State in an Anatomical Model of the Human Head under High-Power EM Exposure
Kim, Woo-Tae ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1073~1084
DOI : 10.5515/KJKIEES.2010.21.10.1073
In this paper, the bio-heat equation including thermoregulatory functions is solved for an anatomically based human head model comprised of 14 tissues to study the thermal implications of high-power exposure to electromagnetic(EM) fields due to half-wave dipole antenna both at 835 and 1,800 MHz. The dipole antenna is located at the side of the ear and the front of the eyes. The FDTD method has been used for the SAR computation. When solving the BHE, the thermoregulation function and sweating effetecs are included in order to predict more exact temperature increase. It is noted that an approximately proportional relationship between the tissues and the maximum temperature increase and the antenna power is not maintained when the thermoregulation and sweating effects are fully accounted for under high power exposure.
Design of Multiple Filter for Reducing Received Signal Fluctuation in FMCW Radar Altimeter
Kim, Sei-Yoon ; Lee, Ho-Jun ; Hyun, Young-Oh ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1085~1093
DOI : 10.5515/KJKIEES.2010.21.10.1085
This paper proposes a multiple filter for reduction of received signal fluctuation and enhancement of step altitude edge detection in FMCW radar altimeter. The proposed filter was composed of alpha-trimmed mean filter, frequency variation limiter, and 1/3 order static filter. Simulations by analysis of received signal show that the proposed filter provides better performance than moving average and standard median filters with error reduction. In particular, the proposed filter was improved in the ability of reducing fluctuation for ground hovering.
Electromagnetic Resonant Transmission through Slits in a Cavity inside Conducting Screen of Finite Thickness
Lee, Jong-Ig ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1094~1102
DOI : 10.5515/KJKIEES.2010.21.10.1094
In this paper, the problem of electromagnetic transmission via slits in a cavity inside conducting screen of finite thickness is considered for the case that the TE(to the slit axis) polarized plane wave is incident on the slit in conducting screen. Using the method of moments the variations of the transmitted power through the slits are obtained and compared with those computed from an equivalent circuit constructed using an equivalent slit admittance. It is found that the effective slit width of a narrow slit, at resonance, becomes
wavelengths independently of the actual slit width. The transmission resonance phenomena in the proposed geometry are explained in connection with the variations of an equivalent admittance of the slit in the cavity.
Design of PIFA with Capacitor Structure Inserted into Feeding Loop
Kim, Seung-Woo ; Park, Sang-Gyu ; Kim, Hyeong-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1103~1108
DOI : 10.5515/KJKIEES.2010.21.10.1103
This paper proposes a new type of PIFA with a capacitor structure inserted into the feeding loop. It operates in GSM900, DCS, PCS, and W-CDMA frequency bands. By inserting the capacitor, it shows the effect of lowering the return loss from -2.73 dB to -6.26 dB at the parallel frequency, 2.01 GHz. The improvement of the poor radiation property near the parallel resonance frequency leads to a broadband operation in the upper band, DCS, PCS, and W-CDMA.
Simple Method for Improving the Frequency Sweep Linearity of FMCW Collision Warning Radar
Hyun, Eu-Gin ; Oh, Woo-Jin ; Lee, Jong-Hun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1109~1115
DOI : 10.5515/KJKIEES.2010.21.10.1109
FMCW(Frequency Modulation Continuous Wave) Radar can detect the distance and the velocity of forward obstacles using linearly modulated FM signal. For better performance, the RF of radar should be operated with wideband frequency linearity on 300 MHz bandwidth at 77 GHz carrier frequency. In this paper, we propose a simple method for improving frequency linearity of FMCW radar implemented with VCO. The proposed method shows that the Voltage-Frequency relation of VCO could be measured by using the modified Tx waveform of FMCW radar. Then the measured nonlinearity could be compensated using LUT(Look-up Table) with easy. It is noted that the proposed can be adopted in existing system without extra circuit.
24 GHz Microstrip Patch Array Antenna for High Sensitivity EM Sensor
Jung, Young-Bae ; Jung, Chang-Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1116~1120
DOI : 10.5515/KJKIEES.2010.21.10.1116
Low cost patch array antenna for high sensitivity electromagnetic(EM) sensor is presented. The operating frequency band of the antenna is 24.05~24.25 GHz. Array structure is the symmetrical pattern by Chebyshev polynomial and the feed point is located in the middle of the array. Also, the gain of the array antenna can be increased by the side wings which are connected with the ground plane. It is proved through simulation and the measurement results that the operating frequency and the side-lobe level(SLL) are rarely changed when the inclined angle of the side wings is varied.
Study on Equivalent Circuit of 45
Phase Shift Layer for Radant Lens
Seong, Cheol-Min ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1121~1127
DOI : 10.5515/KJKIEES.2010.21.10.1121
This paper describes the equivalent circuit of
layer, one of
phase shift layers, which are needed for X-band Radant lens 4-bit phase shifter. The equivalent circuit is extracted by comparing the CST`s MWS results with the Agilent`s ADS results for
phase shift layer. The simulated result is compared with the measured one. Using the extracted equivalent circuit, the phase bit simulation results of 4-bit Radant lens are also presented.
Efficient Resource Allocation to Support QoS in a Fixed Relay Based Cellular System
Kim, Geun-Bae ; Shin, Hee-Young ; Park, Sang-Kyu ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1128~1135
DOI : 10.5515/KJKIEES.2010.21.10.1128
The relay based cellular system has been introduced to provide the service to satisfy the user requirement. The main reasons of using relay station are to expand a service coverage and to increase a system throughput with satisfying the service requirement level. This paper proposes a new resource allocation algorithm which supports the users` throughput fairness and service coverage in the Fixed Relay Based Cellular system with OFDMA. The performance of proposed algorithm is compared with the performances of proportional fairness(PF) algorithm. The simulation result shows that the proposed algorithm increases the number of active users in the service coverage while paying small amount of throughput loss.
Reducing the Effects of Noise Light in an Wireless Optical Communication Using Optoelectronic Feedback
Hwang, Da-Hyun ; Lee, Seong-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1136~1142
DOI : 10.5515/KJKIEES.2010.21.10.1136
In this paper, we reduced the optical noise interference using the ASK modulation with optoelectronic feedback in a wireless optical system in which a lighting LED is used as a light source. The carrier frequency of 70 kHz was generated internally by the oscillation in the optoelectronic feedback circuit, and the output light was ASK modulated at a data rate of 9.6 kbps by opening and shortening the feedback loop with the input signal. In an environment with adjacent noise lights, the ASK modulation with optoelectronic feedback improved the signal to noise ratio by about 25 dB.
A Research on the Bandwidth Extension of an Analog Feedback Amplifier by Using a Negative Group Delay Circuit
Choi, Heung-Gae ; Kim, Young-Gyu ; Shim, Sung-Un ; Jeong, Yong-Chae ; Kim, Chul-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1143~1153
DOI : 10.5515/KJKIEES.2010.21.10.1143
In this paper, we propose an alternative method to increase the distortion cancellation bandwidth of an analog RF feedback power amplifier by using a negative group delay circuit(NGDC). A limited distortion cancellation bandwidth due to the group delay(GD) mismatch discouraged the use of feedback technique in spite of its powerful linearization performance. With the fabricated NGDC with positive phase slope over frequency, the feedback amplifier of the proposed topology experimentally achieved adjacent channel leakage ratio(ACLR) improvement of 15 dB over 50 MHz bandwidth at wideband code division multiple access(WCDMA) downlink band when tested with 2-carrier WCDMA signal. At an average output power of 28 dBm, ACLR of 25.1 dB is improved to obtain -53.2 dBc at 5 MHz offset.
Printed Meander-Monopole Antenna for Multiband Wireless USB Dongle Applications
Jeong, Seong-Jae ; Hwang, Keum-Cheol ; Shin, Jae-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1154~1160
DOI : 10.5515/KJKIEES.2010.21.10.1154
In this paper, a novel printed meander monopole antenna is proposed for wireless USB dongle applications. Dual-wideband resonance is obtained by utilizing a printed meander monopole radiator. The proposed antenna was fabricated on a thin FR-4 substrate with a thickness of 1 mm and a dielectric constant of 4.6. The antenna is fed by a
coaxial cable. This novel USB dongle antenna measures only
. The measured results demonstrates that the antenna supports WiBro, Bluetooth/ISM, WLAN, S-DMB, and WiMAX service bands.
An Analysis on BER Performance of Satellite Communication System Classified by SFH-Modulation Method under Jamming
Park, Woo-Chul ; Go, Kwang-Chun ; Kim, Jae-Hyun ; Kim, Ki-Keun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1161~1168
DOI : 10.5515/KJKIEES.2010.21.10.1161
The FHSS(Frequency Hopping Spread Spectrum), in which a transmitter changes its carrier frequency according to a certain hopping pattern, is widely used in the military communication system, since it is highly resistant to deliberate Jamming. However, the difference of BER performance of satellite communication system which using the different modulation scheme and Jamming model was not studied. Thus, in this paper, we consider PBNJ(Partial-Band Noise Jamming) and WPBJ(Worst case Partial-Band noise Jamming) as Jamming models, and evaluate BER(Bit Error Rate) performances of NC-MFSK(Non-Coherent M-ary Frequency-Shift Keying), SDPSK(Symmetric Differential Phase-Shift Keying), and GMSK(Gaussian filtered Minimum-Shift Keying) modulation schemes. Based on the results, we suggest the best transmission method for each condition.
Design of the RF Front-end for L1/L2 Dual-Band GPS Receiver
Kim, Hyeon-Deok ; Oh, Tae-Soo ; Jeon, Jae-Wan ; Kim, Seong-Kyun ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1169~1176
DOI : 10.5515/KJKIEES.2010.21.10.1169
The RF front-end for L1/L2 dual-band Global Positioning System(GPS) receiver is presented in this paper. The RF front-end(down-converter) using low IF architecture consists of a wideband low noise amplifier(LNA), a current mode logic(CML) frequency divider and a I/Q down-conversion mixer with a poly-phase filter for image rejection. The current bleeding technique is used in the LNA and mixer to obtain the high gain and solve the head-room problem. The common drain feedback is adopted for low noise amplifier to achieve the wideband input matching without inductors. The fabricated RF front-end using
CMOS process shows a gain of 38 dB for L1 and 41 dB for L2 band. The measured IIP3 is -29 dBm in L1 band and -33 dBm in L2 band, The input return loss is less than -10 dB from 50 MHz to 3 GHz. The measured noise figure(NF) is 3.81 dB for L1 band and 3.71 dB for L2 band. The image rejection ratio is 36.5 dB. The chip size of RF front end is
Circularly Polarized Spidron Fractal Antenna with a Conducting Reflector
Kim, Han-Byul ; Hwang, Keum-Cheol ; Shin, Jae-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1177~1183
DOI : 10.5515/KJKIEES.2010.21.10.1177
In this paper, design of a microstrip-fed, Spidron fractal-shaped slot antenna with circular polarization is represented. The ground plane of the designed antenna has a slot that comprises seven right-angled triangle next to each other in a low. A reflector is placed at the bottom on microstrip feeding line to enhance the antenna gain. The optimized design was conducted by varying a length of the first right-angled triangle, location of feeding line, space between a substrate and a reflector. The proposed antenna was fabricated on a Taconic-RF35 substrate. The entire dimension of the fabricated antenna is
and the reflector is 18.6 mm away from the ground plane. The measured gain of the fabricated antenna is 6.7 dBi at 4.3 GHz. The measured bandwidths of -10 dB reflection and 3 dB axial ratio are 41 % and 7.4 %, respectively.
EMC Measurements above 1 GHz Using an Offset Parabola Antenna System
Chung, Yeon-Choon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1184~1193
DOI : 10.5515/KJKIEES.2010.21.10.1184
The upper frequency of international EMC regulations is being expanded above 1 GHz. Radiated emissions above 1 GHz are different from those below 1 GHz that is existing upper regulation frequency, and which have lower field strength and sharper and tilted beam-width, relatively. In this paper, an effective evaluation method to be used above 1 GHz is studied using an offset parabola antenna system having a double-ridged horn antenna as a feed. First, simple model is proposed for calculating antenna factor and field uniformity of the parabola antenna system, and then real radiated emission and radiated susceptibility measurements are performed using a constant noise emitter and the suggested antenna system. The results show that the proposed antenna system has higher gain and power efficiency, and wider field uniformity relative to a conventional double-ridged horn antenna. Therefore, it is confirmed that the proposed system can be effectively used for EMC measurements above 1 GHz.
Interference Avoidance Beamforming for Relay-Based Cellular Networks
Mun, Cheol ; Jung, Chang-Kyoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 10, 2010, Pages 1194~1199
DOI : 10.5515/KJKIEES.2010.21.10.1194
In this paper, for a relay-based cellular network, a interference avoidance beamforming technique is proposed to enhance direct link capacity while minimizing loss in the capacity of concurrent relaying link. A direct link is transmitted by beamforming at the transmitter, and the relaying link with the least interference to the direct link is scheduled to transmit data by a collision avoidance scheduling algorithm. Simulation results show that the proposed IA beamforming provides a considerable direct link capacity enhancement while minimizing relaying link capacity loss by effectively mitigating inference between concurrent direct and relaying links only with limited feedback.