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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 22, Issue 12 - Dec 2011
Volume 22, Issue 11 - Nov 2011
Volume 22, Issue 10 - Oct 2011
Volume 22, Issue 9 - Sep 2011
Volume 22, Issue 8 - Aug 2011
Volume 22, Issue 7 - Jul 2011
Volume 22, Issue 6 - Jun 2011
Volume 22, Issue 5 - May 2011
Volume 22, Issue 4 - Apr 2011
Volume 22, Issue 3 - Mar 2011
Volume 22, Issue 2 - Feb 2011
Volume 22, Issue 1 - Jan 2011
Selecting the target year
SIW-Based 2×4 Array Antenna with a Sequential Feeding for X-Band Satellite Communication
Jung, Eun-Young ; Lee, Jae-Wook ; Lee, Taek-Kyung ; Lee, Woo-Kyung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 125~130
DOI : 10.5515/KJKIEES.2011.22.2.125
In this paper, SIW-based
uniform array antenna with a sequentially fed 8-way power divider with an equal division characteristic is proposed for an application of X-band satellite communication. In particular, sequential feeding structures with a progressive phase difference of 90 degrees between the nearest elements have been suggested to protect the cancellation of electric fields due to the array alignments and to enhance the purity of RHCP(Right-Handed Circular Polarization). The obtained results according to the return loss bandwidth, RHCP antenna gain, axial ratio bandwidth are 760 MHz ranging from 7.90 to 8.66 GHz under the criterion of less than -10 dB, 14.3 dBic at 8.3 GHz, and 600 MHz from 8.15 to 8.75 GHz, respectively. In addition, it is observed that the equal-division characteristic of SIW-based 8-way power divider is approximately -9.2 dB in all ports.
Design of a Double-Faced Window Printed Antenna for Aircraft Applications
Byun, Gang-Il ; Han, Wone-Keun ; Choo, Ho-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 131~139
DOI : 10.5515/KJKIEES.2011.22.2.131
In this paper, we propose a double-faced window printed antenna for aircraft applications. The proposed antenna structure consists of a feeding line and a multi-loop radiator located on different sides of the window to use the limited given-area effectively. The proposed antenna is optimized by the genetic algorithm in conjunction with the FEKO EM simulator. The optimized antenna is built and installed on a 1/10 sized KUH-Surion mock-up and antenna performances such as the reflection coefficient and the radiation patterns are measured. The optimized antenna shows a half power matching bandwidth of about 33 % at 60 MHz and an average bore-sight gain of about -3.49 dBi. To verify the reception capability of the optimized antenna, we simulated the received power according to a flight scenario. The result confirms that the optimized antenna shows a minimum received power level above -60 dBm at a range of 200 km, which is similar to the pole antenna that is currently used as a FM voice antenna for KUH-Surion.
The Method of Performance Improvement for On-Glass Antennas by Optimizing the Surface of the Window Ground
Ahn, Seung-Beom ; Han, Wone-Keun ; Choo, Ho-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 140~147
DOI : 10.5515/KJKIEES.2011.22.2.140
In this paper, we propose a novel feeding method that uses a windshield ground in a vehicle. The feeding method enables for various antennas to integrate easily in a vehicle windshield. To connect a coaxial feeding cable directly to the windshield ground, we inserted a coaxial-to-ground adapter between the cable and the ground, and reflection coefficients using the proposed feeding method were compared to that using a conventional feeding method. The size and position of the windshield ground were optimized in order to achieve a high radiation gain in the azimuth direction. Then the triangular WiBro patch antenna, incorporating the proposed feeding method, was designed and installed on a rear windshield of a commercial sedan. The antenna using the proposed feeding method shows a similar reflection coefficient, and it shows 2 dB increased average azimuth radiation gain compared to that using a conventional sash ground method. These results demonstrate that the proposed feeding method can be applicable for integrating multiple antennas in a rear windshield.
Design of Inverse Class E 2.9 GHz/5.8 GHz Frequency Multiplier
Kim, Tae-Hoon ; Joo, Jae-Hyun ; Koo, Kyung-Heon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 148~153
DOI : 10.5515/KJKIEES.2011.22.2.148
In this paper, an inverse class E frequency multiplier has been designed to generate 5.8 GHz wireless LAN signal by multiplying 2.9 GHz input. The inverse class E frequency multiplier is operating with low inductance value and low peak drain voltage than the class E frequency multiplier. Measurement shows the output power of 21 dBm, the mutiplier gain of 6 dB, and the PAE(Power Added Efficiency) of 35 % with 15 dBm input power.
A Compact Integrated RF Transceiver Module for 2.4 GHz Band Using LTCC Technology
Kim, Dong-Ho ; Kim, Dong-Su ; Ryu, Jong-In ; Kim, Jun-Chul ; Park, Chong-Dae ; Park, Jong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 154~161
DOI : 10.5515/KJKIEES.2011.22.2.154
This paper presents a compact integrated transceiver module for 2.4 GHz band applications using Low Temperature Co-fired Ceramic(LTCC) technology. The implemented transceiver module is divided into an RF Front-End Module (FEM) part and a transceiver IC chip part. The RF FEM part except an SPDT switch and DC block capacitors is fully embedded in the LTCC substrate. The fabricated RF FEM has 8 pattern layers and it occupies less than
. The measured results of the implemented RF FEM are in good agreement with the simulated results. The transceiver IC chip part consists of signal line, power line and transceiver IC for 2.4 GHz band communication system. The fabricated transceiver module has 9 layers including three inner grounds and it occupies less than
. The implemented transceiver module provides an output power of 18.1 dBm and a sensitivity of -85 dBm.
Design of a GaN HEMT 4 W Miniaturized Power Amplifier Module for WiMAX Band
Jeong, Hae-Chang ; Oh, Hyun-Seok ; Heo, Yun-Seong ; Yeom, Kyung-Whan ; Kim, Kyoung-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 162~172
DOI : 10.5515/KJKIEES.2011.22.2.162
In this paper, a design and fabrication of 4 W power amplifier for the WiMAX frequency band(2.3~2.7 GHz) are presented. The adopted active device is a commercially available GaN HEMT chip of Triquint Company, which is recently released. The optimum input and output impedances are extracted for power amplifier design using a specially self-designed tuning jig. Using the adopted impedances value, class-F power amplifier was designed based on EM simulation. For integration and matching in the small package module, spiral inductors and interdigital capacitors are used. The fabricated power amplifier with
shows the efficiency above 50 % and harmonic suppression above 40 dBc for second(2nd) and third(3rd) harmonic at the output power of 36 dBm.
HMSIW Balanced Filter for Improved Isolation between Output Ports
Hwang, Seok-Min ; Byun, Jin-Do ; Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 173~181
DOI : 10.5515/KJKIEES.2011.22.2.173
In this paper, we propose a half mode substrate integrated waveguide(HMSIW) balanced bandpass filter to yield improved isolation between output ports. In order to achieve good isolation, resistive coupling slot is employed in HMSIW filter. The measurement results show that the insertion losses(
dB and input return loss(
) is more than 10 dB from 5.8 GHz to 6.4 GHz. Moreover isolation between output ports is larger than 18 dB and phase difference of output ports is
The Phase Difference Measurement Module Development for Amplitude Modulated Range Measurement System
Noh, Hyoung-Woo ; Park, Jeong-Ho ; Kang, Il-Heung ; Choi, Mun-Gak ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 182~190
DOI : 10.5515/KJKIEES.2011.22.2.182
A amplitude modulation(AM) range measuring system utilizes the phase difference of the modulated envelope of the reflected signal to measure the distance. It is known that the AM system has a problem in accuracy due to antenna leakage signals and spurious reflection signals, but an AM range measurement system using an active reflector, which shifts the frequency bands, has been proposed in order to minimize the measurement errors due to spurious signals. In this paper, a new phase measurement module for the AM range measurement system, which enables to measure long distance with good accuracy, is proposed. The modulation frequency is alternatively selected between 8 and 1 MHz, and the measured distance range with this module is up to 150 m within 2 cm accuracy. A JK flip-flop circuit is used for higher phase accuracy, and an XOR circuit is used to cover long distance.
Approximate Method of Multi-Layer Green's Function Using FDTD Scheme and Rational Function Approximation
Kim, Yong-June ; Koh, Il-Suek ; Lee, Yong-Shik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 191~198
DOI : 10.5515/KJKIEES.2011.22.2.191
In this paper, a method to approximate a multi-layer Green's function is proposed based on a FDTD scheme and a rational function approximation. For a given horizontal propagation wavenumber, time domain response is calculated and then Fourier transformed to the spectral domain Green's function. Using the rational function approximation, the pole and residue of the Green's function can be estimated, which are crucial for a calculation of a path loss. The proposed method can provide a wideband Green's function, while the conventional normal mode method can be applied to a single frequency problem. To validate the proposed method, We consider two problems, one of which has a analytical solution. The other is about multi-layer case, for which the proposed method is compared with the known normal mode solution, Kraken.
Design of Ku-Band BiCMOS Low Noise Amplifier
Chang, Dong-Pil ; Yom, In-Bok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 199~207
DOI : 10.5515/KJKIEES.2011.22.2.199
A Ku-band low noise amplifier has been designed and fabricated by using 0.25 um SiGe BiCMOS process. The developed Ku-band LNA RFIC which has been designed with hetero-junction bipolar transistor(HBT) in the BiCMOS process have noise figure about 2.0 dB and linear gain over 19 dB in the frequency range from 9 GHz to 14 GHz. Optimization technique for p-tap value and electro-magnetic(EM) simulation technique had been used to overcome the inaccuracy in the PDK provided from the foundry service company and to supply the insufficient inductor library. The finally fabricated low noise amplifier of two fabrication runs has been implemented with the size of
. The pure amplifier circuit layout with the reduced size of
without the input and output RF pads and DC bais pads has been incorporated as low noise amplication stages in the multi-function RFIC for the active phased array antenna of Ku-band satellite VSAT.
Analysis of the Protection Ratio of GPS System in the Presence of RF Interference Radiated by UWB System
Cho, In-Kyoung ; Shim, Yong-Sup ; Lee, Il-Kyoo ; Cho, Hyun-Mook ; Hong, Hyun-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 208~213
DOI : 10.5515/KJKIEES.2011.22.2.208
This paper analyzes potential interference effects of Ultra Wide Band(UWB) on Global Positioning System(GPS) which is providing safety service. For the interference analysis, positioning error method is used to determine the minimum protection distance to meet positioning error of 2.5 m below and Minimum Coupling Loss(MCL) method is used to determine the required protection ratio(I/N) from the protection distance of UWB transmitter and GPS receiver to meet positioning error of 2.5 m below. In a result, the minimum protection distance to meet positioning error of 2.5 m below was about 10 m and the protection ratio to meet positioning error 2.5 m below was -20 dB. The protection ratio proposed in this paper is the same value of the protection ratio of safety service proposed by ITU-R. The obtained protection ratio can be used for the protection standard of domestic GPS system for the safe of life service.
Design of Multi-Band Low Noise Amplifier Using Switching Transistors for 2.4/3.5/5.2 GHz Band
Ahn, Young-Bin ; Jeong, Ji-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 214~219
DOI : 10.5515/KJKIEES.2011.22.2.214
This paper presents a multi-band low noise amplifier(LNA) with switching operation for 2.4, 3.5 and 5.2 GHz bands using CMOS 0.18 um technology. The proposed circuit uses switching transistors to achieve the input and output matching for multi-band. By using the switching transistors, we can adjust the transconductance, gate inductance and gatesource capacitance at input stage and total output capacitance at output stage. The proposed LNA exhibits gain of 14.2, 12 and 11 dB and noise figure(NF) of 3, 2.9 and 2.8 dB for 2.4, 3.5 and 5.2 GHz, respectively.
The Effect of Radiated Electromagnetic Wave by Digital Modulation Signals on the Electronic Devices
Cho, Won-Seo ; Kwak, Phil-Keun ; Park, Chang-Yeol ; Yang, Jun-Kyu ; Geum, Hong-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 220~227
DOI : 10.5515/KJKIEES.2011.22.2.220
With the rapid development of mobile communication technology, the technologies based on the diverse digital modulation schemes have been used for the frequency range of over 800 MHz. The only radiation immunity has been tested using only AM signal based on IEC 61000-4-3 without any consideration of the influence of electromagnetic radiation in Korea. However, it has not been tested by wideband digital modulation signals such as cdmaone(IS-95), WCDMA and PM signal. The purpose of this study was to review the standards. In addition, the input signals were analyzed and tested considering the environments in Korea. The results showed that the devices were influenced by digital modulation signal or PM signal more than by AM signal.
SIW Slot Array Antenna for Dual-Polarization Phased Array System
Cho, Dae-Keun ; Byun, Jin-Do ; Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 228~235
DOI : 10.5515/KJKIEES.2011.22.2.228
In this paper, we propose a
SIW(Substrate Integrated Waveguide) slot array antenna for dual-polarized phased array system. The basic part of the array is a subarray comprising an vertical-polarization and horizontal-polarization. A vertical-polarization slotted SIW single-polarization linear array. Using SIW, A vertical polarization linear array consists of 8 uniform longitudinal slots and 4-way SIW feeding network. Using HMSIW, horizontal-polarization linear array consists of 8 slots and 4-way SIW feeding network.
A Study of Flexible T-DMB Antenna Using Rectangular Stub and Matching Circuit
Kim, Ho-Jin ; Lee, Seon-Hyeon ; Lee, Young-Hun ; Lee, Sang-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 236~244
DOI : 10.5515/KJKIEES.2011.22.2.236
In this paper, we proposed flexible T-DMB dipole-shaped antenna that has strength of glass antenna and also has portability and ease of production. The input impedance of antenna according to vehicle body-effect was considered in order to install the antenna on the top of the front window. Installation position of on-glass antennas are changeable defends on driver, so we proposed Interdigital capacitor in feeding point to achieve matching characteristic with no position limit. The measurement result showed good return loss characteristic-below -6 dB in the T-DMB frequency band and maintained fixed resonant frequency.
A Novel Design Method of Microstrip Dual-Band Filter Using PI-SIR and OLRR
Lim, Ji-Eun ; Lee, Jea-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 245~251
DOI : 10.5515/KJKIEES.2011.22.2.245
In this paper, dual-band bandpass filter by using Pseudo-Interdigital Stepped-Impedance Resonator(PI-SIR) and Open-Loop Ring Resonator(OLRR) is proposed. The first passband and second passband are formed by PI-SIR and the second passband is reinforced by an OLRR. In a PI-SIR the first band and second band are easily and exactly adjusted by characteristic impedance ratio and electrical length ratio. The proposed design method may be confirmed to be useful from fabricated and measured results for dual-band bandpass filter operated at 2.45 GHz and 5.8 GHz.
Design of Dual-Band Bandpass Filter Using Dual-Mode Resonators
Lee, Ja-Hyeon ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 252~257
DOI : 10.5515/KJKIEES.2011.22.2.252
A compact microstrip dual-band bandpass filter with controllable bandwidth for each passband is proposed. Each passband is independently designed using two different dual-mode resonators. The proposed dual-band bandpass filter has three transmission zeros. Two transmission zeros are generated by each dual-mode resonator. An additional transmission zero is generated by input/output port coupling. The dual-band bandpass filter application is designed for 2.4/5.7 GHz WLAN. Experimental results are presented to validate theory.
Design and Fabrication of a Offset-PLL with DAC
Lim, Ju-Hyun ; Song, Sung-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 258~264
DOI : 10.5515/KJKIEES.2011.22.2.258
In this paper, we designed a frequency synthesizer with a low phase noise and fast lock time and excellent spurious characteristics using the offset-PLL(Phase Locked Loop) that is used in GSM(Global System for Mobile communications). The proposed frequency synthesizer has low phase noise using three times down conversion and third offset frequency of this synthesizer is created by DDS(Direct Digital Synthesizer) to have high frequency resolution. Also, this synthesizer has fast switching speed using DAC(Digital to Analog Converter). but phase noise degraded due to DAC. we improved performance using the DAC noise filter.
Studies on Miniaturization and Notched Wi-Fi Bandwidth for UWB Antenna Using a Wide Radiating Slot
Beom, Kyeong-Hwa ; Kim, Ki-Chan ; Jo, Se-Young ; Ko, Young-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 2, 2011, Pages 265~274
DOI : 10.5515/KJKIEES.2011.22.2.265
In this paper, it is studied on wide radiating slot antenna's miniaturization for ultra wide-band(UWB) technologies and notch structure to prevent interference between UWB systems and existing wireless systems for using Wi-Fi service of IEEE standards 802.11 a/n. Proposed antenna that wide slot is decreased from
length of resonant frequency has decreased by 72 % compared with conventional antenna. And optimized T-shaped CPW-fed stub has satisfied UWB bandwidth for 3.0~11.8 GHz. Then, creating 2-order Hilbert curve slot line in the stub's patch area, 4.9~5.6 GHz that centered frequency is 5 GHz is eliminated. Finally, the designed antenna constructed on FR4-epoxy has
dimension. The measured results that are obtained return loss under -10 dB through 3.2~11.8 GHz without Wi-Fi bandwidth, a linear phase characteristic, a stable group delay, and omnidirectional radiation patterns are presented.