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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 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
Study on the Bandwidth of Microstrip Patch Antenna
Lee, Chick-Youl ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 581~585
DOI : 10.5515/KJKIEES.2013.24.6.581
A technique to expand the operating impedance bandwidth of a microstrip patch antenna is presented. The antenna is fed by a truncated T-shaped microstrip line on the ground plane with the rectangular slot. The proposed microstrip patch antenna offers wide bandwidth characteristics with the rectangular slot which has optimized size and position on the ground plane. The simulation result shows a fractional bandwidth of 127.8 %(0.65 to 2.95 GHz) at VSWR 2:1.
A Study of Center Longitudinal Shunt-Series Coupling Slot Fed by Asymmetric Compound Iris for Waveguide Slot Coupler
Kim, Byung-Mun ; Ko, Ji-Hwan ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 586~594
DOI : 10.5515/KJKIEES.2013.24.6.586
This paper proposes a new coupling element of microwave slot coupler for designing waveguide slot array which can reduce the effect of undesired higher order mode coupling between coupling and radiating slots in the branch waveguide. The proposed device is composed of a centered longitudinal shunt-series coupling slot at the center of broad wall shared by two crossed rectangular waveguides and an asymmetric compound iris that excites the coupling slot. We first have obtained scattering parameters for the proposed coupler by use of EM S/W tool HFSS and then extracted the parameters of T- network equivalent circuit for the coupling slot. We also have analyzed the resonant properties such as resonant length and normalized admittance by changing the geometrical dimensions. The measured results for the fabricated coupler with short-circuited block
away from the coupling slot are well agreed with the simulated ones.
Millimeter-Wave CMOS On-Chip Dipole Antenna Design Optimization
Choi, GeunRyoung ; Choi, Seung-Ho ; Lee, Kook Joo ; Kim, Moonil ; Kim, Dowon ; Jung, Dong Yun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 595~601
DOI : 10.5515/KJKIEES.2013.24.6.595
This paper presents an optimized design of a millimeter-wave on-chip dipole antenna using CMOS process. The serious flaw of the antenna using CMOS process is low radiation efficiency because of high permittivity and conductivity. To overcome the weakness, we need to widen radiation area in air and optimize distance between an antenna and a reflector. The radiation efficiency and bandwidth of the designed antenna are respectively 16.5 % and 22.3 % at 80 GHz. Systematic methods are attempt to analyze an effect on the antenna radiation efficiency. To widen radiation area in air, substrate cut angle and distance between the antenna and chip edge are adjusted. In addition, to optimize distance between an antenna and reflector, substrate thickness and distance between the antenna and a circuit ground plane are adjusted.
Design of a Miniaturized 5.3 GHz 360° Analog Phase Shifter
Jeong, Hae-Chang ; Son, Bon-Ik ; Lee, Dong-Hyun ; Ahmed, Abdul-Rahman ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 602~612
DOI : 10.5515/KJKIEES.2013.24.6.602
In this paper, a design and fabrication of miniaturized 5.3 GHz reflection type
analog phase shifter with branch line coupler and
variable reactance load. In order to miniaturize phase shifter, novel branch line coupler is proposed. The novel branch line coupler is miniaturized using transformation of transmission line to T and
type equivalent circuit. The miniaturized branch line coupler has small size of above 50 % compared with conventional branch line coupler. For wide phase shift range,
variable reactance load structure is adopted. Especially, the structure was improved for linear phase shift by adding transmission line which acts as an impedance transformer. The improved structure was miniaturized using the equivalent lumped-element of transmission line. The fabricated phase shifter with
shows wide phase shift of above
, the insertion loss of -4~-6 dB and the reflection loss of below -20 dB at 5.3 GHz under 0~10 V control voltage range.
Design of 20 W Class-E Amplifier Including Protection for Wireless Power Transmission at ISM 13.56 MHz
Nam, Min-Young ; Kim, Young-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 613~622
DOI : 10.5515/KJKIEES.2013.24.6.613
In this paper, an inductive clamping class-E power amplifier has been tested for wireless power transmission at ISM band, 13.56 MHz. The implemented power amplifier is designed to operate stably without destroying power transistor in wireless power transmission system which basically keeps not to align between a transmitting antenna and a receiving antenna. The power amplifier is also designed to enhance harmonic filtering characteristic. The amplifier was tested with a DC supply voltage of 28 V and input power of 25 dBm at 13.56 MHz. The test results show the output power level of 43 dBm, the difference power level between fundamental frequency and second harmonic frequency of more than 55 dBc, the dc current consumption of 830 mA, and the high power-added efficiency of 85 %. Finally, the implemented power amplifier operated normally with 830 mA DC current consumption from 28 V source when the two antennas were aligned, and the power transmission was successful. But when the two antennas were not aligned, its DC current consumption automatically decreased down to 420 mA to protect the switching transistor.
A Study of Error Estimation and Adaptive Junction Subdivision for Electromagnetic Topology
Park, Yoon-Mi ; Chung, Young-Seek ; Jung, Hyun-Kyo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 623~632
DOI : 10.5515/KJKIEES.2013.24.6.623
Electromagnetic topology simplifies a complex analysis area in accordance with electromagnetic coupling. And then electromagnetic topology divides the simplified continuous area into sub-areas and analyzes electromagnetic problems at the sub-areas. Therefore electromagnetic topology has a merit to analyze the electromagnetic coupling in large and complex systems, however simplified modeling technique can generate large errors. In this paper, power balance method is used to estimate errors and subdivide junctions in the electromagnetic topology. The method is applied to analyze conducted and radiated electromagnetic coupling in two kinds of cavity models. Improvement of accuracy was accomplished in accordance with junction subdivision. Moreover we could save computation time and memory comparing with FDTD results.
Novel Extraction Method for Unknown Chip PDN Using De-Embedding Technique
Kim, Jongmin ; Lee, In-Woo ; Kim, Sungjun ; Kim, So-Young ; Nah, Wansoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 633~643
DOI : 10.5515/KJKIEES.2013.24.6.633
GDS format files, as well as layout of the chip are noticeably needed so as to analyze the PDN (Power Delivery Network) inside of IC; however, commercial IC in the market has not supported design information which is layout of IC. Within this, in terms of IC having on-chip PDN, characteristic of inside PDN of the chip is a core parameter to predict generated noise from power/ground planes. Consequently, there is a need to scrutinize extraction method for unknown PDN of the chip in this paper. To extract PDN of the chip without IC circuit information, the de-embedding test vehicle is fabricated based on IEC62014-3. Further more, the extracted inside PDN of chip from de-embedding technique adopts the Co-simulation model which composes PCB, QFN (Quad-FlatNo-leads) Package, and Chip for the PDN, applied Co-simulation model well corresponds with impedance from measured S-parameters up to 4 GHz at common measured and simulated points.
Analysis of Penetration Phenomenon of High Altitude Electromagnetic Pulse into Buried Facilities with Various Moisture Content and Depth
Kang, Hee-Do ; Oh, Il-Young ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 644~653
DOI : 10.5515/KJKIEES.2013.24.6.644
In this paper, a formulation for obliquely incident electromagnetic wave has been presented for an analysis of highpower electromagnetic pulse penetration into multilayered dispersive media. Based on generalized models of measured dielectric constants and propagation channels reflecting the Earth`s general features, the propagation phenomenon of the obliquely incident early-time(E1) high altitude electromagnetic pulse(HEMP) is analyzed. In addition, the polarization and critical angle are also considered. It is found that the total reflection occurs at an incident angle of about 38 degrees at the soil-rock interface, and that the parallel-polarized E1 HEMP penetrates better than the perpendicular-polarized one. The peak level of the penetrating electric field is found to be 5.6 kV/m at normal incidence, regardless of the type of polarization, and E1 HEMP is greatly reduced near the critical angle. Moreover, the penetrating E1 HEMP is analyzed as a variation of moisture content and depth of materials, resulting E1 HEMP could be useful in determining the levels of shielding required for buried facilities.
A Study of Bi-Static Through-Wall Imaging Radar Using a Noise Waveform
Ha, Jong-Soo ; Cho, Byung-Lae ; Sun, Sun-Gu ; Lee, Jong-Min ; Cho, Kyu-Gong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 654~660
DOI : 10.5515/KJKIEES.2013.24.6.654
This paper describes an imaging approach to detect targets behind a wall. To acquire the accurate information over the strong signals reflected by the wall and affected by multipath, a bi-static through-wall imaging radar using a noise waveform is proposed in this paper including the methodology of imaging the received signal. The complete derivation of the proposed approach is presented. And the result of tests is demonstrated to show the possibility of the proposed approach.
Periodic Mixed Waveform Measurement Techniques for Compact Radar Transmitter with Phase-Continuous Signal
Kim, So-Su ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 6, 2013, Pages 661~670
DOI : 10.5515/KJKIEES.2013.24.6.661
In this paper, we propose the measurement techniques of mixed waveform. Mixed waveform has phase-continuous periodic waveform with fixed frequency signal and Linear Frequency Modulation(LFM) signal. This waveform is generated from a compact radar transmitter with frequency synthesizer and high power amplifier. Frequency synthesizer generates various signal waveform with continuos phase and high power amplifier amplify transmitting signal. First, we describe a compact radar transmitter with the phase-continuos signal and then verify the distortion characteristic of pulse compression by the mismatch of LFM waveform. Second, we describe three kinds of measurement techniques for measuring LFM waveform. These techniques include methods using signal analyzer, signal source analyzer and new methods using RF mixer and phase shifter. Finally, we verify the accuracy of the measurement technique from the pulse compression result of receiving signal.