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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 13, Issue 10 - Dec 2002
Volume 13, Issue 9 - Oct 2002
Volume 13, Issue 8 - Sep 2002
Volume 13, Issue 7 - Aug 2002
Volume 13, Issue 6 - Jul 2002
Volume 13, Issue 5 - Jun 2002
Volume 13, Issue 4 - Apr 2002
Volume 13, Issue 3 - Mar 2002
Volume 13, Issue 2 - Feb 2002
Volume 13, Issue 1 - Jan 2002
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Design and Fabrication of K Band Push-Push Dielectric Resonator Oscillator
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 613~624
Electrical characteristics of two types of 20 GHz Push-Push GaAs MESFET dielectric resonator oscillators having Wilkinson and T-junction power combiners for the output stage have been investigated and compared. So we have explained that the output power and phase noise properties of the Push-push FET DRO are depending on return loss and isolation characteristics of power combiner at the fundamental and the second harmonic frequencies. A Push-push oscillator for suppressing the fundamental frequency of 10 GHz and enhancing the second harmonic of 20 GHz has been designed and fabricated in microstrip configuration on 20 mil thick RT-Duroid(
= 2.52) Teflon substrate. Return loss and isolation characteristics of T-junction and Wilkinson have been measured at the fundamental frequency of 10.2 GHz and the second harmonic frequency of 20.5 GHz. At the fundamental frequency, -12 dB return loss and -3.7 dB isolation have been measured for the T-junction power combiner, and -14 dB return loss and -11 dB isolation fur the Wilkinson power combiner. At the second harmonic frequency, -10 dB return loss and -7.5 dB isolation have been obtained for the T-junction power combiner, and -23 dB return loss and -22 dB isolation for the Wilkinson power combiner. As a result, we have confirmed that the oscillator based on the Wilkinson power combiner with better retrun loss and isolation characteristics produces more output power and better phase noise characteristics..
Modified Inverted-F Type Wide Band Ceramic Dielectric Chip Antenna for IMT-2000 Handset
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 625~632
In this paper, a wide band modified inverted-F type antenna printed on a high dielectric ceramic material is designed and fabricated. This antenna is designed to have optimum antenna characteristics analyzing the effects of design parameters such as printed antenna pattern, ceramic dielectric material dimension and dielectric constant on antenna characteristics using the commercial simulation tool HFSS. The fabricated antenna's width, length and height are 8 mm, 8 mm and 3 mm, respectively. Measurement results show that it has -10 dB bandwidth of 270 MHz which satisfies the IMT-2000 bandwidth required for handset and that its maximum radiation gain is 2 dBi.
A Study on the Small Chip Meander Antenna for Dual-frequency Operation
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 633~640
In this paper, the small chip meander antenna for dual-frequency operation is presented. The proposed chip meander antennas was fabricated by the ceramic chip using LTCC-MLC process. It is a novel compact dual-frequency design using a meandered patch that achieves more degrees of freedom for adjusting dual-frequency operation and the size reduction with narrow frequency ratio. And it is proposed that the 3D structure for additional size reduction of the meander antenna. The size reduction of the 3D meander antenna is as large as 50 % as compared to the design for dual-frequency operation not using 3D structure. It is observed that the principle of dual-frequency operation through current distribution, return loss and radiation pattern.
BER and Throughput Analyses of the Analytical Optimum Chip Waveform
Ryu, Heung-Gyoon ; Chung, Ki-Ho ; Lee, Dong-Hun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 641~648
The study on the chip waveform design to minimize multiple-access interference (MAI) and its performance evaluation are very important since chip waveform decides the signal quality and system capacity of the direct-sequence CDMA wireless communication system. This paper suggests the analytical chip waveform to minimize the MAI. The BER and throughput performances achieved by the proposed analytical optimum chip waveform are compared with those of the conventional chip waveforms in the Nakagami-m distribution frequency selective channel when the differential phase shift keying (DPSK) is employed in DS-CDMA system. From the numerical results, capacity and throughput are improved about 2 times and 1.4 times respectively when it is compared with the Kaiser chip waveform that is considered as one of the best in the conventional ones.
Analysis of Phase Noise in Digital Hybrid PLL Frequency Synthesizer
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 649~656
This paper addresses the phase noise analysis of high-speed DH-PLL(Digital Hybrid Phase-Locked Loops) frequency synthesizer. Because of the additional quantization noise of D/A converter in DH-PLL, the phase noise of DH-PLL is increased than the conventional PLL. Three kinds of noise sources such as reference input, D/A converter, and VCO(Voltage Controlled Oscillator) are considered to analyze the phase noise. It largely depends on the closed loop bandwidth and frequency synthesis division ratio(N) so that we can decide the optimal closed loop bandwidth to minimize the phase noise of DH-PLL. It is shown that the simulation results closely match with the results of analytical approach.
A Study on New Broadband Phase Shifter using λ/8 Parallel Stubs
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 657~666
In this paper, a new broadband phase shifter to adjust the slope of dispersive phase characteristic for frequency of transmission network was proposed. The new fundamental network consists of a fixed main line with a length of λ/2 at the center frequency and two double stubs, each with a length of λ/8 at the center frequency, which are open and shorted, respectively, and which are shunted at the edge points of the main line. Characteristic impedances of the main line and two parallel double stubs are adjusted to produce a minimum phase error and to obtain an input and output match at the desired phase shift. Especially, the proposed structure is especially suitable for a broadband phase shifter with large phase shifts more than 90
, and it is operated in the octave bandwidth. To verify the usefulness of a new broadband phase shifter, each 45
-bit phase shifter and 3-bit phase shifter(45
-phase step), which is cascaded in series, operated at the center frequency 3 GHz were designed, fabricated and experimented. The measured results were in very close agreement with the corresponding simulation results over the bandwidth of I/O impedance match and phase error for each phase shift.？？？8
The Study on New Radiating Structure with Multi-Layered Two-Dimensional Metallic Disk Array for Shaping flat-Topped Element Pattern
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 667~678
In this paper, a new radiating structure with a multi-layered two-dimensional metallic disk array was proposed for shaping the flat-topped element pattern. It is an infinite periodic planar array structure with metallic disks finitely stacked above the radiating circular waveguide apertures. The theoretical analysis was in detail performed using rigid full-wave analysis, and was based on modal representations for the fields in the partial regions of the array structure and for the currents on the metallic disks. The final system of linear algebraic equations was derived using the orthogonal property of vector wave functions, mode-matching method, boundary conditions and Galerkin's method, and also their unknown modal coefficients needed for calculation of the array characteristics were determined by Gauss elimination method. The application of the algorithm was demonstrated in an array design for shaping the flat-topped element patterns of
beam width in Ka-band. The optimal design parameters normalized by a wavelength for general applications are presented, which are obtained through optimization process on the basis of simulation and design experience. A Ka-band experimental breadboard with symmetric nineteen elements was fabricated to compare simulation results with experimental results. The metallic disks array structure stacked above the radiating circular waveguide apertures was realized using ion-beam deposition method on thin polymer films. It was shown that the calculated and measured element patterns of the breadboard were in very close agreement within the beam scanning range. The result analysis for side lobe and grating lobe was done, and also a blindness phenomenon was discussed, which may cause by multi-layered metallic disk structure at the broadside. Input VSWR of the breadboard was less than 1.14, and its gains measured at 29.0 GHz. 29.5 GHz and 30 GHz were 10.2 dB, 10.0 dB and 10.7 dB, respectively. The experimental and simulation results showed that the proposed multi-layered metallic disk array structure could shape the efficient flat-topped element pattern.
Prediction of Performance Loss Due to Phase Noise in Digital Satellite Communication System
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 679~686
Based on the alternating series expansion of error probability function due to phase noise in PSK systems, the performance evaluations for Tikhonov and Gaussian probability density functions were performed in this paper. The range of the signal-to-noise ratio of recovered carrier signal which provides the same dependency between the error performances by Tikhonov function and Gaussian function was analyzed via loss evaluation due to phase noise. The phase noise with 1/f
characteristic was generated based on the relationship of the phase noise spectral density and the modulation index for frequency modulation signal. Using the generated phase noise as the input signal for digital satellite communication receiver, the performance losses due to the phase noise were measured and evaluated with the analyzed performance characteristics.
The Design of Broadband Patch Antenna with Microstrip Line-Probe Feeder
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 687~692
The design of broadband patch antenna with the new feeder structure is proposed in this paper. The antenna operates in the center frequency 5.8 GHz. Proposed the new feeder structure has also broadband characteristic and reduced antenna size. To confirm broadband characteristic, compared with probe feeder antenna. After designing and manufacturing, the antenna bandwidth enhanced by 34.5 % and the patch size reduced by 45 %.
Study on Coverage Analysis using Interference Cancellation in WCDMA System
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 693~701
In this paper, we analyze the coverage of asynchronous IMT(International Mobile Telecommunication)-2000 reverse link with a MUD(Multi-User Detector) system. The MUD system is utilized to increase the coverage of reverse link. Also we have considered a propagation loss model and an interference effect. Because it is very difficult that we have calculated the interference accurately, so a fractional cell loading factor(F) is used in this paper. We make use of a MUD efficiency(
) to analyze the performance; this efficiency is presented the MAI of reduction. A simulation utilizes Hata's model, we calculated the coverage according to voice and data services. In this paper, we have assumed that the frequency of carrier has 800 MHz or 1.9 GHz, and a bandwidth is decided 3.84 MHz. We have predicted the performance of actual system by the analysis of capacity and coverage.
Design of Dual frequency Inverted-F Antenna with Spur Line
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 702~708
In this paper, we design the dual frequency antenna that could easily determine two operation frequencies by its inverted-F antenna structure and spur line length. The spur line is applied to the inverted-F antenna, in order to dual operation characteristics in PCS and cellular frequencies. It has designed by using the IE3D commercial software based on the moment method. As the designed antenna is fabricated and measured, you can see the results such as the return loss, the input impedance, the radiation patterns, and the gain. The size of this antenna is 40 mm
9.4 mm, it is compact enough to use as an intenna. Also, This antenna can be used with cellular and PCS phone of domestic market.
Low Profile Dual Feeding Microstrip Antenna with High Isolation
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 709~715
In this paper, a novel low profile dual feeding microstrip antennas with microstrip and H-shaped aperture feeding are proposed to achieve high isolation and easy feeding, and the validity of the proposed antennas is demonstrated experimentally. In the proposed single and 1
4 array antenna, the measured isolations are less than -49 dB and -48 dB, impedance bandwidths are 4 % at 12.5 GHz and 2.1 % at 14.25 GHz for the VSWR<1.5 in both antennas and maximum gains are 8.25 dBi and 14.2 dBi.
Reception Performance Improvement of the Long-Haul WDM System with the Channel Interference Due to FWM Effect through the Power Symmetric Mid-Span Spectral Inversion
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 716~725
In this paper, we showed the applicability of power symmetric MSSI(Mid-Span Spectral Inversion) to the long-haul WDM system with the channel interference due to FWM(Four Wave Mixing). And we showed the degree of performance improvement. We used 1 dB EOP(Eye-Opening Penalty) criterion so as to evaluate the degree of compensation dependent on the variation of chirp parameter of optical pulse for the various input power in high speed tansmission system. And we evaluated the maximum input power of channel be able to be the signal to crosstalk noise (SNR) above 20 dB in the transmission link with the channel interference due to FWM. Consequently the proposed MSSI compensation method is capable to transmitting the total 68 WDM channels simultaneously with a 0.4 nm channel spacing and 5.3 dBm maximum input power in a 10 Gbps transmission link. Therefore the proposed power symmetric MSSI compensation method may be very useful for the implementation of long-haul wideband WDM transmission systems with relatively high power and improved performance.
A Study on the Path Loss Modeling for Mobile Cellular System
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 726~731
The purpose of this paper is to analyze the path loss for the mobile cellular system. The maximum distance is 150 km and the area is about 6,000
and the field test was performed for the total 5 base stations. The path loss was calculated by Hata and Okumura models, respectively. As a result, it was shown that a proper model for the field test data is the middle one between the rural model and suburban/rural Hata model.
SAR Analysis on the Coaxial-Slot Antenna for Hyperthermia
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 13, issue 7, 2002, Pages 732~739
Performance of the applicator for hyperthermia is determined by both the degree of impedance matching and specific absorption rate(SAR) distribution in the surrounding tissue. In this paper, the coaxial-slot antenna using staircasing approximation in the FDTD is analyzed and the coaxial-slot antenna for the hyperthermia improving heating characteristics is designed. The SAR of the coaxial-slot antenna approximated to staircasing and square model is analyzed, and the SAR of staircasing model is compared with Saito's SAR measurement and square model. As a result, the SAR of proposed model exhibited agreement with the Saito's measurement of square model. Ig averaged SAR on the liver caused by proposed antenna in this paper is 195 W/kg, and is about 27.9 % higher than the Saito's antenna 152.5 W/kg, respectively.