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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
Editor in Chief :
Volume & Issues
Volume 10, Issue 7 - Dec 1999
Volume 10, Issue 6 - Oct 1999
Volume 10, Issue 5 - Sep 1999
Volume 10, Issue 4 - Aug 1999
Volume 10, Issue 3 - Jun 1999
Volume 10, Issue 2 - Apr 1999
Volume 10, Issue 1 - Feb 1999
Selecting the target year
Design of Subharmonic Injection Locked Oscillator
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 653~662
In this paper, subharmonically injection locked oscillator(SILO) was designed and measured. SILO with series feedback was designed using Two Signal Method(TSM). The free-running oscillator frequency was 9.4 GHz with 6 dBm output power. In case of injection, the multiplied injected signal locked the free-running frequency. The locked signal output power was higher than any other spurious response at least 40 dB. The locking range was 220MHz (second subharmonic locking), 100 MHz(4th subharmonic locking), and phase noise was -111 dBc/Hz, -104 dBc/Hz at 100kHz offset, respectively.
Effects of Source and Load Impedance on the Linearity of GaAs MESFET
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 663~671
The linearity of the GaAs FET power amplifier(PA) is greatly influenced by source and load impedance for the FETs. The third order intermodulation products, IM3, from the GaAs FET PA are investigated in relation with source and load impedance. From heuristic as well as analytic point of view, e.g., Volterra series analysis, is employed to analyze the effects of nonlinear circuit elements, gate-source capacitance,
, and drain-source current,
. The sweet spots where soure and load impedance produce the least intermodulation products are calculated and compared with the load and source pull data with good agreements. It also shows that source impedance has a greater effect on the intermodulation products than the load impedcnce.
The Design of RF Active Bandpass Filters using Active Impedance Inverters
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 672~679
This paper describes the design method of active bandpass filters which employ active impedance inverters. Several authors have reported active bandpass filters. However, the functional description of the active blocks in the filters have not been throughly studied. In this paper, the active inverter block of the bandpass filter has is analyzed in the view point of filter design. The designed 3-pole bandwidth filter has its insertion gain of 24 dB at the center frequency of 865 MHz with 75 MHz bandwidth. The noise figure of the active bandpass filter is less than 2.5 dB within its passband.
Miniaturized Silicon Micromachined Bandpass Filter
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 680~687
An extensive study on miniaturized bandpass filter(BPF) appropriate for mobile communication systems is presented in this paper. The miniaturization has been accomplished by incorporating low-loss high-index materials inside a resonating cavity fabricated in silicon substrate using micromachining etching techniques. By use of materials with dielectric constant
=500, filters with volume less than 0.11
have been designed at the center frequency of 5.8 GHz with 3.3% bandwidth. The electrical performances and design tolerances of these filters for a variety of materials and shapes are discussed and design guidelines are presented herein.
A Novel Air-Gap Stacked Microstrip 3 dB Coupler for MMIC
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 688~693
This paper presents a very simple coupled line structure for MMIC which uses stacked microstrip line and does not employ any dielectric process step. For the analysis and optimization of these coupled line structure, HP-Momentum was used. The measured performance of 3 dB coupler shows 23 to 45 GHz broadband characteristics. Additionally, a balanced 2-stage Ka-Band power amplifier which uses the proposed 3 dB coupler, was also fabricated.
A Design of 3 dB Power Divider using Slow-wave Characteristic
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 694~700
In this paper, we studied the design of power divider using the slow-wave effect of Photonic Bandgap structure, which is etched on the ground plane. The proposed PBG structure can provides the changing of the characteristic impedance of the transmission line and the group delay velocity characteristic. Therefore we can make wider width than the width of conventional transmission line and decrease the length of transmission line. We presented the application for power divider using the characteristic impedance and electrical length extracted from scattering parameter. As adding proposed defect units, the effect of defect is studied. The experimental results show good agreements with the simulated results.
The Analysis of Scattering Characteristics of Raindrops and Estimation of Specific Rain Attenuation for Different Drop Shapes
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 701~710
To predict rain attenuation accurately, we must know scattering characteristics of rain-drops for real drop shapes. In this paper, the scattering characteristics of rain-drops are analyzed by an analytical model, and the differences in the characteristics of the forward scattering amplitudes for three different rain-drop shapes are compared. Using the results for the Pruppacher-Pitter's real rain-drop shaper, the specific rain attenuation in domestic environment is predicted, and the difference from the ITU-R model is compared and analyzed.
ACPR Analysis of WLL Reverse Link Power Amplifier with AM-to-AM and AM-to-PM Distortion
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 711~718
Some of modern communication systems make use of broadband digital modulation with 5 MHz and 10 MHz. In the broadband communication systems, the nonlinear properties of power amplifier have a great effect on all systems. This paper analyzed the ACPR characteristics of WLL reverse link power amplifier with the varying AM and PM nonlinearities and suggests the required backoff from 1 dB compression point to satisfy the ACPR specifications. Also the comparions between the measured and the simulated characteristics are presrnted.
Induced Voltages on LAN Cables Due to Incident Electromagnetic Fields
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 719~726
Multiconductor transmission line(MTL) equations are solved by FDTD method to examine the coupling between incident electromagnetic fields and multiconductor transmission lines. The measurement of induced voltages on UTP Category 5 and STP Category 5 cables which are used as LAN cables is carried out using a TEM cell where uniform and strong TEM fields can be established. The comparison between measured and simulated results shows good agreement. It is also found that grounding of shield foil at both terminations and small grounding resistance give good shielding effects for STP Category 5.
A Design of 3-Dimension Microstrip Antennas with Wide Bandwidth
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 727~737
Printed microstrip antennas are known to have limitations in terms of bandwidth and efficiency all imposed by the presence of the dielectric substrate. In this paper, to overcome these limitations, rather than using a superstrate geometry, the printed circuit is etched out of metal and supported in "strategic points" by(metallic or nonmetallic) post. The main motivation for this work was to obtain the wide bandwidth microstrip antennal which exhibits a higher efficiency than conventional ones. In this paper, to increase the bandwidth, patch sizes, electrical thickness and impedance matching are considered.
Design of an Aperture-Coupled Dual Beam Microstrip Array Antenna
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 738~746
In this paper, a microstrip
dual beam array antenna is designed at 10 GHz. The radiating element is an aperture-coupled patch, and it is analyzed by the transmission line model. The feed is a tapered parallel-series type to reduce the side lobe level. To obtain dual beam at
, The difference in phase excitation between the elements is
. In conclusion, the side lobe level is 25 dB, and the beam width
with two main lobes at
A Study on the Conversion Efficiency of Rectenna using Dual-Polarization and FSS Method
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 747~756
In this paper, we analyzed microwave-DC conversion efficiency for the dual-polarization rectenna and antenna position changing. And then we analyzed and applied Square-Loop FSS structure for reducing the diode harmonic components as a rectifying circuit. The results of microwave-DC conversion efficiency for the each of designed dual-polarization rectenna has 69.1% with
(dipole type) and 75.4% with
(patch type) optimum load resistor. When the each of dual-polarization rectenna has a optimal load resistor, it's conversion efficiency shows of
20% in dipole type and
5% in patch type at
position. When applied Square-Loop FSS structure for Rectenna, Insertion loss was under 1 dB as the passband and over 20 dB as the stopband. The microwave -DC conversion efficiency was represented good properties of
Design of a L-Type Aperture Coupled Circular Polarization Patch Antenna Using Microstrip Feeding
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 757~765
In this paper, L-Type aperture coupled circular polarization patch antenna for mobile communication(IMT-2000, 1.9375 GHz), which is capable of being mounted in mobile unit, was designed and fabricated. This antenna is expanded to the
circular polarization array antenna for satellite mobile communications which are using the L-band frequency. The results are as followings : Returnloss 18.56 dB, beamwidth
, gain 7 dBd, axial ratio 0.9 dB in the case of single element and returnloss 28.43 dB, beamwidth
, gain 9.8dBd, axial ratio 1.5 dB in the case of
A 3D Ray-Tracing Propagation Model for Analyses on the Indoor Polarization Diversity Scheme
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 766~776
In this paper to evaluate the performance of the polarization diversity and the space diversity in the indoor environment, we used 3D Ray-tracing simulation. This model is capable of predicting small scale fading characteristics of the channel for evaluating the performances of both the polarization and the space diversity scheme. The measurement and simulation results show that the polarization diversity and the space diversity are expected to be efficiently used for the indoor environments. Moreover, the results show that the proposed polarization diversity technique using directional dual polarization microstrip array antennas has more diversity gain than the conventional polarization and space diversity using dipole antenna.
A Study on the Mode Combination for Efficient Calculation of Scattering Matrix in Mode-Matching Techniques
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 777~785
For an efficient calculation of scattering matrix in mode matching techniques, mode combination has been studied in this paper. A conducting post in rectangular waveguide, which is most commonly utilized in the combline filter structure, is adopted and its scattering matrix is derived. We eliminates the TE and TM modes having little influence on result, which results in the different number of TE and TM modes in each discontinuous region.
Array Gain Improvement of Triple Line Array System Using Inverse Beamforming
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 10, issue 5, 1999, Pages 786~795
To detect the precise of arrival of target signal in real ocean environments, Inverse beamformnig(IBF) solutions to the Inverse beamforming integral equation are surveyed theoretically and the performance properties of the IBF are analyzed with simulations. IBF-Cardioid beamforming algorithm is proposed for port/starboard discrimination and the performance gains are studied with simulations. It is shown that IBF has a 3 dB array noise gain advantage over CBF under ideal conditions. This 3 dB array noise gain advantage is proven by theocratical studies and simulations. This array noise gain advantage leads to a minimum detectable level advantage for IBF output compared with CBF output. The fact that the IBF beamwidth is narrower than the CBF beamwidth by a factor of 0.68 proves the performance of detection and spatial resolution improvement. Comparing the simulation results of IBF-Cardioid beamforming and Conventional Cardioid beamforming, it is shown that IBF-Cardioid beamformer have performance enhancement in minimum detection level, detection accuracy and resolution.