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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 18, Issue 12 - Dec 2007
Volume 18, Issue 11 - Nov 2007
Volume 18, Issue 10 - Oct 2007
Volume 18, Issue 9 - Sep 2007
Volume 18, Issue 8 - Aug 2007
Volume 18, Issue 7 - Jul 2007
Volume 18, Issue 6 - Jun 2007
Volume 18, Issue 5 - May 2007
Volume 18, Issue 4 - Apr 2007
Volume 18, Issue 3 - Mar 2007
Volume 18, Issue 2 - Feb 2007
Volume 18, Issue 1 - Jan 2007
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Co-Channel Interference Mitigation and System Throughput Maximization Using Hybrid Joint Reuse Partitioning in Multimedia Mobile Communications
Kim, Jeong-Su ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 465~470
DOI : 10.5515/KJKIEES.2007.18.5.465
The co-channel interference is a primary factor of loss in multimedia mobile communications. In this paper, we present a performance of the frequency reuse partitioning to refrain the co-channel interference and maximize system performance. First, we analyze the co-channel interference using the frequency reuse partitioning through the statistical modeling. From this results, we decide on the frequency reuse partitioning for the system throughput which is maximized. Finally, analysis and simulation results show that the frequency reuse partitioning based cellular system can mitigate the co-channel interference and maximize the system throughput. The experimental results show that system throughput is maximized from 0.7 to 0.8 according to traffic road. We can maximize the system throughput using the results with cellular system design parameter.
Field Distribution of the Reverberation Chamber with Flat Diffusers Composed of Multiple Dielectric Materials
Kim, Young-Ryoul ; Kim, Hye-Kwang ; Rhee, Joong-Geun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 471~477
DOI : 10.5515/KJKIEES.2007.18.5.471
This paper presents the characteristics of electromagnetic field uniformity in a reverberation chamber with flat diffusers composed of multiple dielectric materials that can be used as an alternative facility for the analysis, test and evaluation of electromagnetic interference and immunity. The field characteristics and the size of the test volume inside the reverberation chamber with the new diffuser of multiple dielectric materials are simulated and analyzed at
GHz band. The FDTD method is used to analyze the field characteristics. The field uniformity, polarization characteristics and tolerance are improved by the new diffuser with smaller physical size. The reverberation chamber with flat diffusers composed of multiple dielectric materials shows better electromagnetic performance and larger test volume than normal chamber.
An Unequal Power Divider with Adjustable Dividing Ratio
Lim, Jong-Sik ; Oh, Seong-Min ; Koo, Jae-Jin ; Jeong, Yong-Chae ; Ahn, Dal ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 478~485
DOI : 10.5515/KJKIEES.2007.18.5.478
In this paper, an unequal 1:N Wilkinson power divider with adjustable dividing ratio is proposed. The proposed unequal power divider is composed of basic Wilkinson structure. It consists of rectangular-shaped defected ground structure (DGS), isolated island pattern in DGS, and varactor diodes of which capacitance depends on bias voltage. The characteristic impedance value of microstrip line having DGS goes up and down by controlling bias voltage for diodes, and consequently the power dividing ratio(N) is adjusted. The obtained N from measurement is
which mean the proposed divider has adjustable unequal dividing ratio.
Design and Fabrication of a Minimum Insertion Loss Parallel-Coupled-Line-Filter for the Suppression of LO Harmonics
Kim, Hyun-Mi ; Yang, Seong-Sik ; Oh, Hyun-Seok ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 486~495
DOI : 10.5515/KJKIEES.2007.18.5.486
In this paper, we present the design procedure of BPF(Band Pass Filter) for the suppression of LO(Local Oscillator) harmonics. The required suppression at given harmonics is the key issues in such a filter design, while the bandwidth and the suppression of the unwanted signals are more important in the conventional RF filter design. In LO filter design the bandwidth is used for the minimization of the insertion loss for the desired signal. In addition, we propose the novel tuning procedure based on Momentum to consider the unknown parasitic effects, which usually are not included in the circuit design step and results in undesirable and frustrating tuning after fabrication.
Design and Realization of a Slotted Waveguide Feeder for Improving Electric Field Uniformity in Multi-Mode Cavity
Lee, Jung-Hwan ; Choi, Sung-Su ; Kim, Seung-Jae ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 496~502
DOI : 10.5515/KJKIEES.2007.18.5.496
In this paper, a slotted waveguide feeder for the electric field uniformity in multi-mode cavity is designed and fabricated. In case of the conventional feeder, a mode stirrer or a turntable is used for improving electric field uniformity in the multi-mode cavity. The proposed feeder has four slots, which have uniform radiation characteristic, on broad wall and shorted terminations at both ends. The electric field uniformity is simulated by CST`s MWS(Microwave Studio) for the conventional and proposed feeders, respectively. The fabricated feeder shows the return loss of less than -20 dB at 2.45 GHz. To verify the validity of our proposal, the temperature distribution of the water samples in the multi- mode cavity is observed after a few minutes` heating. The proposed feeder is confirmed to have much better field uniformity in the multi-mode cavity than the conventional feeder.
Internal Antenna Design for GSM900/DCS1800/PCS1900 Using an Overlap of Return Loss
Jang, Byung-Chan ; Kim, Che-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 503~510
DOI : 10.5515/KJKIEES.2007.18.5.503
This paper proposes the design scheme of internal triple band antenna intended for using in GSM900, DCS1800, and PCS1900 bands. The suggested folding metal plates of the two branches are mounted on a dielectric coated ground plane for size miniaturization and durability. Return losses are overlapped when length of metal branches are controlled. This is important technique for wide band operation. For the suggested antenna geometry its return loss was calculated by HFSS 9 simulator, and was shown to be -10 [dB] less within the required band. Also, gain and radiation pattern of antenna were measured using far field measurement system in an anechoic chamber. The measured peak gain is more than 3.0 [dBi], and the average gain is over -1.0 [dBi] for the triple band, which is regarded as satisfactory for the internal antenna application. Also, the radiation pattern for two frequencies shows a similar shape each other within the required band.
Design and Fabrication of a Compact Ka-Band Synthesizer Module
Kim, Hyun-Mi ; Yang, Seong-Sik ; Lee, Man-Hee ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 511~521
DOI : 10.5515/KJKIEES.2007.18.5.511
In this paper, we designed and fabricated a Ka-band synthesizer module. In addition, the systematic layout procedure and the test procedure were presented for the construction of compact synthesizer. To implement the Ka-band synthesizer, X-band VCO is employed as VCO and its frequency was multiplied by 3 with frequency tripler. The fabricated frequency synthesizer shows a frequency tuning range of 500 MHz, output power of about 14 dBm, and a phase noise of -96.17 dBc/Hz at the 100 kHz offset frequency.
Wideband Tunable Semidynamic Fractional Frequency Divider MMIC
Won, Bok-Yeon ; Shin, Jae-Wook ; Shin, Hyun-Chol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 522~529
DOI : 10.5515/KJKIEES.2007.18.5.522
A semidynamic frequency divide-by-1.5 MMIC comprises a tunable polyphase filter, tunable image-rejection mixer, and a static divide-by-2 in the feedback path. Wideband suppression of unwanted tones is achieved by employing a tunable image-rejection mixer and a tunable single-stage polyphase filter. Implemented in GaInP/GaAs HBT technology, the divide-by-1.5 MMIC operates over the input frequency range of 4.5 to 9.2 GHz with better than -20 dBc suppressions of
tones, while dissipating 29 mA from 4.1 V supply.
Indictor Library for RF Integrated Circuits in Standard Digital 0.18 μm CMOS Technology
Jung, Wee-Shin ; Kim, Seung-Soo ; Park, Yong-Guk ; Won, Kwang-Ho ; Shin, Hyun-Chol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 530~538
DOI : 10.5515/KJKIEES.2007.18.5.530
An inductor library for efficient low cost RFIC design has been developed based on a standard digital 0.18
CMOS process. The developed library provides four structural variations that are most popular in RFIC design; standard spiral structure, patterned ground shield(PGS) structure to enhance quality factor, stacked structure to enable high inductance values in a given silicon area, multilayer structure to lower series resistance. Electromagnetic simulation, equivalent circuit, and parameter extraction processes have been verified based on measurement results. The extensive measurement and simulation results of the inductor library can be a great asset for low cost RFIC design and development.
The Design and Fabrication of Reduced Phase Noise CMOS VCO
Kim, Jong-Sung ; Lee, Han-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 539~546
DOI : 10.5515/KJKIEES.2007.18.5.539
In this paper, a 3-D EM simulation methodology for on-chip spiral inductor analysis has provided and it is shown that the methodology can be adapted to the highly predictable design for CMOS VCO. LC-resonator type VCO have fabricated by using standard 0.25 um CMOS process. And the LC VCO layout case which has pattern ground shielded inductors and the other layout case which has no pattern grounded inductors were fabricated for the verification of their effects on the VCO`s phase noise by reducing the Q-factor of inductors. Fabricated VCO has 3.094 GHz, -12.15 dBm output at the tuning voltage of 2.5 V, and from the simulation, Q-factor of the pattern grounded inductor has increased 8% at 3 GHz, and from the measurement results, the phase noise has reduced by 9 dB at the 3 MHz off-set frequency for the pattern grounded inductor layout case.
A Design of Size Reduced Ring-Hybrid using Coupled Lines of Hairpin Type
Lee, Hong-Seop ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 547~552
DOI : 10.5515/KJKIEES.2007.18.5.547
In this paper, the coupled microstrip lines of hairpin type are applied to design a compact microstrip ring hybrid. When the gap decreases, three attenuation poles are created by coupling between the lines. The proposed structure can achieve a significant reduction of size and suppression of the harmonics. And it has the same frequency responses of conventional ring hybrid at 2.55 GHz. The harmonics are suppressed to below -20 dB up to 12 GHz, including the third harmonic. The ring part size of the proposed ring hybrid is reduced to one forth of the conventional ring hybrid. The measured frequency responses agree well with simulated ones.
Telemetering System of Extremely Low Frequency Magnetic Field Intensity
Yoo, Ho-Sang ; Wang, Jong-Uk ; Seo, Geun-Mee ; Gimm, Yoon-Myoung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 553~562
DOI : 10.5515/KJKIEES.2007.18.5.553
In this paper, we designed and implemented the system for telemetering ELF(Extremely Low Frequency) magnetic field intensity. The magnetic field measurement system used a 3-axis magnetic field sensor to measure the magnetic field with isotropy and the equalizer to compensate the frequency characteristic in band. By multiplexing three output signals of the magnetic field sensor in time domain, we got the uniform gain and frequency characteristic among three axes. This system was designed that the magnetic field measurement level range was
and the measurement frequency band was
. The control system would access to the magnetic field measurement system with RF and the maximum access distance was 1.0 km. We confirmed that the measurement level error of the fabricated system was within 5 %. The fabricated system was installed to a golf practice range where a high voltage power transmission line was crossed.
Design of a 900 MHz RFID Compact LTCC Package Reader Antenna Using Faraday Cage
Kim, Ho-Yong ; Mun, Byung-In ; Lim, Hyung-Jun ; Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 563~568
DOI : 10.5515/KJKIEES.2007.18.5.563
In this paper, the proposed package antenna, which is meander line structure with short pin, is miniaturized to realize RF-SoP at 900 MHz RFID band. The RFID BGA(Ball Grid Array) chip is put in a cavity of LTCC Layers. The coupling and cross talk, which are happen between BGA chip and proposed package antenna, are reduced by faraday cage, which consists of ground and via fences, is realized to enhance the isolation between BGA chip and antenna. The proposed antenna structure is focused on the package level antenna realization at low frequency band. The novel proposed package antenna size is
. The measured resonance frequency is 0.893 GHz. The impedance bandwidth is 9 MHz. The maximum gain of radiation pattern is -2.36 dBi.
Analysis of Electromagnetic Resonant Transmission through a Narrow Slit in Thick Conducting Screen
Kwak, Seung-Soon ; Park, Jong-Eon ; Ko, Ji-Whan ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 18, issue 5, 2007, Pages 569~575
DOI : 10.5515/KJKIEES.2007.18.5.569
The transmission resonance phenomenon through a narrow slit in the thick conducting screen is analyzed by use of the method of moments. In order to check the validity of this approach, some numerical results for the transmission coefficient is compared with previous ones. In particular, an approximate expression for the transmission width is derived in the analytical form.