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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 20, Issue 12 - Dec 2009
Volume 20, Issue 11 - Nov 2009
Volume 20, Issue 10 - Oct 2009
Volume 20, Issue 9 - Sep 2009
Volume 20, Issue 8 - Aug 2009
Volume 20, Issue 7 - Jul 2009
Volume 20, Issue 6 - Jun 2009
Volume 20, Issue 5 - May 2009
Volume 20, Issue 4 - Apr 2009
Volume 20, Issue 3 - Mar 2009
Volume 20, Issue 2 - Feb 2009
Volume 20, Issue 1 - Jan 2009
Selecting the target year
Design and Performance Analysis of UWB Modules for Borehole Radar System
Cho, Jae-Hyoung ; Kim, Sang-Wook ; Kim, Se-Yun ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1121~1129
DOI : 10.5515/KJKIEES.2009.20.11.1121
In this paper, the UWB(Ultra-Wide Band) modules such as a pulse generator and the LNA(Low-Noise Amplifier) with AGC(Auto Gain Control) are designed to construct a cross-borehole pulse radar system, of which performance is compared with the existing system. The budget and specification of the radar system are determined by calculating the total path loss of the underground medium including an empty cavity. The pulse generator is fabricated to have the repeatation frequency 40 kHz, the pulse width lower than 5 ns and the peak signal level +73 dBm. The UWB LNA is designed to have the noise figure 3.77 dB, the variable gain range 100 dB and the frequency range of 20 MHz to 200 MHz. Compared with the existing system in an actual test site, the implemented system renders it possible to detect the blind area due to the UWB LNA with low noise figure.
Design of Printed Circuit Board for Clock Noise Suppression in T-DMB RF Receiver
Kim, Hyun ; Kwon, Sun-Young ; Shin, Hyun-Chol ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1130~1137
DOI : 10.5515/KJKIEES.2009.20.11.1130
This paper proposes a new clock routing design for suppressing clock harmonic effects in a Printed Circuit Board (PCB) for a terrestrial Digital Multimedia Broadcasting(DMB) system. Typical crystal reference frequencies that are widely used in DMB tuners are 16.384 MHz, 19.2 MHz, 24.576 MHz. When the high-order harmonic components of these reference frequencies fall near the RF channel frequencies, receiver sensitivity of the tuners is seriously degraded. In this work, we propose a new clock routing design in order to address the clock harmonic coupling issue. The proposed design incorporates two inductors for isolating the clock ground from the main ground, and adopts a new strip line-style routing instead of the conventional microstrip line style routing to minimize the overlap area with the main ground. As a result, the RF sensitivity of the T-DMB tuner is improved by 2 dB.
Ground Moving Target Displacement Compensation and Performance Analysis in the DPCA Based SAR-GMTI System
Jung, Jae-Hoon ; Jung, Jung-Soo ; Jung, Chul-Ho ; Kwag, Young-Kil ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1138~1144
DOI : 10.5515/KJKIEES.2009.20.11.1138
The velocity and acceleration of the ground moving target can cause the target position to be displaced and defocused in the SAR image. In this paper, the displacement compensation scheme is presented to correct the displaced position and defocused moving target image in the DPCA based SAR-GMTI system. The influence of the ground moving target due to the velocity and acceleration is analyzed in range and azimuth directions, and its compensation method is presented with the simulation results. The performance of the proposed method is compared with respect to the estimated velocity and defocused quantity in both range and azimuth directions.
A Dual Baud Microstrip Antenna with Soft Surface for Gapfiller Applications
Kim, Byoung-Chul ; Ryu, Joon-Gyu ; Choo, Ho-Sung ; Jang, Dae-Ik ; Park, Ik-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1145~1160
DOI : 10.5515/KJKIEES.2009.20.11.1145
In this paper, a dual band microstrip antenna with soft surface for gapfiller applications is proposed. The proposed antenna with similar radiation pattern and gain is fabricated on RO4003 substrate with a dielectric constant of 3.38 and a thickness of 0.508 mm, and operates in IEEE 802.11a/b bands. The size of the antenna is
and the ground plane size including soft surface structure is
. The antenna is fed by coaxial cable. The simulated bandwidths of the antenna are 2.388~2.493 GHz and 5.561~6.051 GHz for VSWR<2. The gains are 10.63 dBi and 10.33 dBi, respectively, for the lower and upper bands.
Analysis of A-Sandwich Radome with Metamaterials Core
Lee, Kyung-Won ; Hong, Ic-Pyo ; Park, Beom-Jun ; Chung, Yeong-Chul ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1161~1170
DOI : 10.5515/KJKIEES.2009.20.11.1161
In this paper, dielectric, drude model and ideal metamaterial are applied to core of A-Sandwich radome and each radome is analyzed using recursive method in Ku band. The main parameters of radome performance are insertion loss, insertion phase delay and depolarization. In case of ideal metamaterial, the radome using ideal metamaterial dose not generate depolarization because insertion loss, insertion phase delay and loss for incidence angle of wave do not happened. If circular polarization wave is incident on radome with meta material, transmitted wave also keeps circular polarization. In case of the dispersive metamaterial, the performance of radome using dispersive metamaterial is better than it of radome using dielectric in a part of frequency band. From these results, it is showed that metamaterial can be applied to various radome structure.
Pulse Doppler Radar Signal Processor Development for Main Battle Tank Using High Speed Multi-DSP
Park, Gyu-Churl ; Ha, Jong-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1171~1177
DOI : 10.5515/KJKIEES.2009.20.11.1171
A missile warning radar is an essential sensor for active protection system to detect antitank missile in all weather environments. This paper introduces missile warning radar for main battle tank and presents the results of the design and implementation of the radar signal processor using high speed multi-DSP. The key algorithms include adaptive CF AR, weighted linear fitting algorithm, S/W tracking capability, and threat decision and present test result.
Design and Implementation of Wideband Ultra-Fast High Precision Frequency Synthesizer for ELINT Equipment
Lee, Kyu-Song ; Jeon, Kye-Ik ; Oh, Seung-Hyeub ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1178~1185
DOI : 10.5515/KJKIEES.2009.20.11.1178
In this paper, a wideband ultra-high speed & high purity discrete frequency synthesizer having minimum 2.5 MHz step size was proposed. To achieve fast and wideband operation, discrete frequencies were synthesized by mixing of 3 different pre-synthesized 16 frequencies made from fixed PLL and frequency dividers. Frequencies with discrete 2.5 MHz step were produced in 710~1,610 MHz. The measured hopping response time was 350 nsec average, output level was 21.5 dBm average with 2.65 dB flatness, spurious and harmonics level were suppressed below -60 dBc, and phase noise was -94 dBc/Hz@100 Hz. Also, a new measurement method for synthesizer response time was described.
Implementation of Compressive Receiver with Chirp LO Based on DDS for RFID Signal Detection
Jo, Won-Sang ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1186~1193
DOI : 10.5515/KJKIEES.2009.20.11.1186
In this paper, we propose DDS(Direct Digital Synthesizer) as a new implementation method of chirp LO(Local Oscillator) for compressive receiver applied for RFID signal detection in UHF band. We designed a receiver whose input frequency range is 908.5~914 MHz, DDL(Dispersive Delay Line) bandwidth is 6 MHz, and dispersion delay time is
. Chirp LO based on DDS is designed to meet
sweep time and 12 MHz bandwidth for complete compressive mechanism. The measured 3 dB pulse width of the compressed signal of the fabricated receiver is 260 ns and the frequency resolution for simultaneous input signals is below 200 kHz. These performances indicate that the proposed chirp LO based on DDS and the compressive receiver is suitable for RFID signal detection in UHF band.
High Efficiency FPCB Antenna for the Dual Band Mobile Phone
Seo, Sang-Hyuk ; Son, Tae-Ho ; Jo, Young-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1194~1200
DOI : 10.5515/KJKIEES.2009.20.11.1194
An internal antenna which has 1 cc volume was implemented on the FPCB(Flexible Printed Circuit Board) for the mobile phone. We increased antenna gain and efficiency by the applying of current direction concept on the antenna pattern for this small antenna. Short antenna length for the GSM band was compensated by the spiral inductor on the FPCB. For broadening bandwidth on GSM band, it's applied 2 spiral inductors. A conductor pattern for the DCS band was positioned perpendicular with the FPCB. Antenna was implemented on FPCB that is dielectric constant 4.4 and thickness 0.05 mm, and FPCB was attached on a carrier dimensioned
. Measurements showed that max. VSWR 2:1, efficiency 42.49~60.95 % and 47.95~73.21 %, average gain -3.72~-2.15 dBi and -3.19~-1.35 dBi on the GSM and DCS band, respectively. These results are good performances among the small antenna. And the radiation patterns are omnidirectional on the H-plane to both band.
Improvement of DOA Resolution Capability for Coherent Sources Using a Characteristic of Spatial Spectrums
Park, Gwang-Moon ; Lee, Hyeung-Gu ; Hong, Sung-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1201~1208
DOI : 10.5515/KJKIEES.2009.20.11.1201
The Direction-Of-Arrival(DOA) resolution of signals depends on the aperture size of the array. Therefore it is not easy to resolve closely spaced coherent signals impinge on an array with a small radius. In order to overcome the problem, a new method is proposed to use the characteristic of spatial spectrums for arrays which have different aperture sizes after virtually expanding the spacing of original antenna array. In case of coherent signals impinge on an uniform circular array, the perfect DOA resolution capability of 100 % is achieved at the SNR range of -10 dB to 0 dB by the Deterministic Maximum Likelihood(DML) algorithm including the proposed method. On the other hand, the standard DML algorithm can not resolve signals at all at the same SNR.
Efficient QEGT Codebook Searching Technique for a MISO Beamforming System
Park, Noe-Yoon ; Kim, Young-Ju ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1209~1216
DOI : 10.5515/KJKIEES.2009.20.11.1209
This paper presents an efficient Quantized Equal Gain Transmission(QEGT) codebook index searching technique for MISO beamforming system in a Rayleigh flat fading channel. The searching time for the optimum weight vector among the codebook vectors increases exponentially when the codebook size increases linearly, although the bit error rate decreases. So, newly defined simple metric is proposed for fast searching, which determines a few candidates. Then the conventional method combined with accurate search algorithm selects the optimal index. This strategy significantly reduces the overall search time, while maintaining almost the same bit error rate performance. Furthermore, as the codebook size increases, the search time is considerably decreased compared to that of the conventional approach.
A Study on the Control of Asymmetric Sidelobe Levels and Multiple Nulling in Linear Phased Array Antennas
Park, Eui-Joon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1217~1224
DOI : 10.5515/KJKIEES.2009.20.11.1217
This paper newly proposes a methodology towards computing antenna element weights which are satisfying asymmetric sidelobe levels(SLLs) specified arbitrarily on both sides of the main beam pattern, in the linear phased array antenna pattern synthesis problem. Opposite to the conventional methods in which the element weights are directly optimized from the array factor, this method is based on the optimum perturbations of complex roots inherent to the Schelkunoff's polynomial form which is described for the array factor. From the proposed methodology, the capability of nulling the directions of multiple jammers is also possible by independently perturbing only the complex roots corresponding to each jamming direction, hence allowing an enhancement of the simplicity of the numerical procedure by means of a proper reduction of the dimension of the solution space. The complex weights over the array are then easily computed by substituting the optimally perturbed complex roots to the Schelkunoff's polynomial. Some examples are examined and numerically verified by substituting the extracted weights into the array factor equation.
A Parabolic Edge Planar Monopole Antenna for Indoor Digital TV Reception
Leem, Jong-Ye ; Hur, Jung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 11, 2009, Pages 1225~1232
DOI : 10.5515/KJKIEES.2009.20.11.1225
In this paper, a parabolic edge planar monopole antenna for indoor DTV reception is presented. The antenna has broadband property with the planar monopole and ground of parabolic edges. It is designed close to self-complementary structure as changing curvature of edges of monopole and ground. Monopole and ground conductors of the antenna are on the same plane, and excited through CPW feeding. It is fabricated on an FR4 dielectric substrate of
, and the dimension is
. Return loss is larger than 10 dB in 470~806 MHz. Maximum gain is 1.86 dBi on E-plane at 810 MHz and 3.86 dBi on H-plane at 600 MHz.