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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
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The Radiation Characteristics Improvement and Thickness Reduction of Base Station Antenna with Artificial Magnetic Conductor
Son, Cheol-Hong ; Ahn, Ji-Hwan ; Chang, Ki-Hun ; Yoon, Ji-Hwan ; Yoon, Young-Joong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1233~1242
DOI : 10.5515/KJKIEES.2009.20.12.1233
In this paper, a Base Station Antenna(BSA) utilizing Artificial Magnetic Conductor(AMC) as reflector instead of common conductive plate to improve radiation characteristics and achieve low-profile is proposed. In the case of the conventional BSA on conductive surface which acts as a reflector, a secondary radiation is caused at the corner of the conductive surface, and it increases the back-lobe of the antenna, resulting in deteriorating the radiation characteristic of the conventional BSA. However, using the AMC, the back-lobe of the BSA can be largely reduced by the surface wave suppression. And the Side-Lobe Level(SLL) is also improved, resulting in preventing the service area overlapped. Furthermore, due to the
reflection phase on AMC, the profile of the BSA can be also reduced.
T/R Module Development for X-Band Active Phased-Array Radar
Kim, Dong-Yoon ; Chong, Min-Kil ; Kim, Sang-Keun ; Chon, Sang-Mi ; Na, Hyung-Gi ; Baik, Seung-Hun ; Ahn, Chang-Soo ; Kim, Seon-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1243~1251
DOI : 10.5515/KJKIEES.2009.20.12.1243
This paper presents design and test results of X-Band Transmit/Receive(T/R) module for active phased-array radar. Active phased array radars typically require solid state T/R modules with high output power, low noise figure, high Third Order Intercept(TOI), and sufficient gain in both transmit and receive. The output power of the module is 9 watts over a wide bandwidth. The noise figure is as low as 2.8 dB. Phase and amplitude are controlled by the 6-bit phase shifter and 5-bit attenuator, respectively. Highly integrated T/R module is achieved by using LTCC(Low Temperature Co-fired Ceramic) multiple layer substrate. The module incorporates a compact digital interface, requires only three supply voltages.
A Study on Digital RF System with Interference Cancellation System
Joo, Ji-Han ; Lee, Sang-Joo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1252~1263
DOI : 10.5515/KJKIEES.2009.20.12.1252
In this paper, in order to improve a service quality and to broaden the service coverage in the mobile communication system a study on a digital RF repeater employed with an Interference Cancellation System(ICS) is performed. The digital RF repeater employed with an ICS is implemented to remove interference and feedback signals which are disadvantages of a conventional(or general) RF repeater. This thesis presents the design and experiments of the new wireless repeater. The proposed wireless repeater consists of a RF repeater mounted with digital engine. The digital ICS engine consists of a DSP and FPGA. The digital engine and RF circuit are designed into a one-piece. After developing hardware through the digital platform they are also designed and fabricated into a one-piece in order to apply a best performance repeater system. The method of removing interference and feedback signals is an adaptive IF technique employed with a LMS algorithm. The powerful performance and fast convergence speed is obtained by using this method.
Multi-Band Chip Slot Antenna for Mobile Devices
Nam, Sung-Soo ; Lee, Hong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1264~1271
DOI : 10.5515/KJKIEES.2009.20.12.1264
In this paper, the chip slot antenna which is used for mobile devices and designed for multi-band is proposed. The proposed antenna is comprised of a chip antenna(10 mm
1.27 mm) and a system circuit board(30 mm
0.8 mm). The chip slot antenna is mounted on the system circuit board and the end of F-type strip line which is patterned on the chip antenna is connected by a via with a ground plane of the system circuit board. So, a chip antenna radiates effectively the energy by transition between a microstrip line of the system circuit board and a open slot structure of the chip antenna. In the results of proposed antenna, impedance bandwidth of 3:1 VSWR(-6 dB return loss) is 1.98 GHz(1.61~3.59 GHz) and 0.8 GHz(5.2~6 GHz). So, it can cover multi-band of DCS, PCS, UMTS, WLAN. The proposed antenna can be applied to mobile devices.
Improved Characteristic of Radiated Emission of a PCB by Using the Via-Hole Position
Kim, Li-Jin ; Lee, Jae-Hyun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1272~1278
DOI : 10.5515/KJKIEES.2009.20.12.1272
The cancellation method of P/G(power/ground) plane resonances which are generated between the power plane and the ground plane in a 4-layer PCB(Printed Circuit Boards) with a via-hole for the improvement of the RE(Radiated Emission) characteristic is presented. The validity of the proposed method was confirmed from simulation and measurement of performances of signal transmission characteristic, intensities of edge-radiation and radiated emission of PCB with a via-hole.
Analysis on Frequency Sharing between LEO Satellite Network and FS System in Space-to-Earth Direction
Gam, Hye-Mi ; Oh, Dae-Sub ; Ahn, Do-Seob ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1279~1286
DOI : 10.5515/KJKIEES.2009.20.12.1279
This paper addresses the analysis of the interference produced between the LEO(Low Earth Orbit) satellite constellation and FS(Fixed Service) system operating in the same frequency and area. At first, we calculates the interference of FS system from the LEO satellite constellation depending on the number of LEO satellite antenna beams. Simulation results show that the amount of interference that was calculated from each region. This result can be used to define the carrier level for protecting FS system from total interference by LEO satellite constellation. In the second scenario, we calculates the interference of LEO satellite system earth station by the FS link depending on radius of protection area. The presented results can be used to design FS systems minimizing interference to earth station.
LP-Based SNR Estimation with Low Computation Complexity
Kim, Seon-Ae ; Jo, Byung-Gak ; Baek, Gwang-Hoon ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1287~1296
DOI : 10.5515/KJKIEES.2009.20.12.1287
It is very important to estimate the Signal to Noise Ratio(SNR) of received signal in time varying channel state. Most SNR estimation techniques derive the SNR estimates solely from the samples of the received signal after the matched filter. In the severe distorted wireless channel, the performance of these estimators become unstable and degraded. LP-based SNR estimator which can operate on data samples collected at the front-end of a receiver shows more stable performance than other SNR estimator. In this paper, we study an efficient SNR estimation algorithm based on LP and propose a new estimation method to decrease the computation complexity. Proposed algorithm accomplishes the SNR estimation process efficiently because it uses the forward prediction error and its conjugate value during the linear prediction error update. Via the computer simulation, the performance of this proposed estimation method is compared and discussed with other conventional SNR estimators in digital communication channels.
A Detection Algorithm Study of the Victim Signal for the DAA Regulation in MB-OFDM UWB System
Shin, Cheol-Ho ; Choi, Sang-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1297~1307
DOI : 10.5515/KJKIEES.2009.20.12.1297
The purpose of this paper is to propose a detection algorithm and a tracking algorithm based on silent time using MB-OFDM UWB(Multi-Band Orthogonal Frequency Division Multiplexing Ultra Wide Band) receiver in order to satisfy DAA(Detect And Avoid) regulation of Korea to permit UWB in 3.1~4.8 GHz. In DAA regulation of Korea, if UWB device receives a signal more than -80 dBm/MHz from the victim system during UWB operation, the UWB system should avoid the collision within 2 sec. In this paper, we proposed the detection algorithm to detect the victim signal received by －80 dBm/MHz for the avoidance process that changes the operating UWB frequency to other UWB frequency and the subcarrier tracking algorithm to follow up the subcarrier positions of the victim signal for the tonenulling avoidance process that decreases the TX power of subcarriers occupied by the victim signal by -70 dBm/MHz. The performance of the detection algorithm and the tracking algorithm suggested in this paper is verified in simulation results considering various conditions.
Design of a Full Polarimetric Scatterometer for X-Band
Hwang, Ji-Hwan ; Lee, Kyung-Yup ; Park, Seong-Min ; Oh, Yi-Sok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1308~1315
DOI : 10.5515/KJKIEES.2009.20.12.1308
A full-polarimetric scatterometer(HPS: Hongik Polarimetric Scatterometer) for X-band is designed, fabricated, and verified using the theoretically well-known point-targets in this paper. The X-band full-polarimetric scatterometer consists of an OMT(Orthogonal-Mode Transducer)+horn antenna, the angle control part for the OMT+horn antenna, a transmitter/receiver with a network analyzer and a frequency-conversion circuitry, and a movable support of these parts. We use an inclinometer sensor to control the vertical and horizontal incidence angles. The full polarimetric data can be obtained because of the polarization switches and the OMT. The accuracy of the scatterometer system is verified by measuring the polarimetric RCS(Radar Cross Section) of one of the theoretically well-known point-targets, i.e., a corner reflector.
Modified Cross-Aperture Coupled Microstrip Circular Polarization Array Antenna for WLAN
Seo, Yong-Seok ; Ahn, Jung-Mo ; Jung, Jin-Woo ; Lee, Hyeon-Jin ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1316~1324
DOI : 10.5515/KJKIEES.2009.20.12.1316
In this paper, cross-aperture coupled microstrip circular polarization antenna is proposed for 5.8 GHz WLAN(Wireless Local Area Network). A single antenna consists of square patch and slots are located in series feed line with
/4 phase different which make current direction maximum and minimum repeatedly to generate RHCP(Right Handed Circularly Polarization). We are proposed new structure that removed the section which intersected at a right angle and were composed to four separated slots. The proposed cross slots reduce back lobe of radiation pattern and improve antenna gain. Impedance bandwidth of the manufactured
array antenna is from 5.67 to 5.95 GHz and the maximum radiation gain is 10.59 dBi.
A 2.4 GHz Bio-Radar System with Small Size and Improved Noise Performance Using Single Circular-Polarized Antenna and PLL
Jang, Byung-Jun ; Park, Jae-Hyung ; Yook, Jong-Gwan ; Moon, Jun-Ho ; Lee, Kyoung-Joung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1325~1332
DOI : 10.5515/KJKIEES.2009.20.12.1325
In this paper, we design a 2.4 GHz bio-radar system that can detect human heartbeat and respiration signals with small size and improved noise performance using single circular-polarized antenna and phase-locked loop. The demonstrated bio-radar system consists of single circular-polarized antenna with
hybrid, low-noise amplifier, power amplifier, voltage-controlled oscillator with phase-locked loop circuits, quadrature demodulator and analog circuits. To realize compact size, the printed annular ring stacked microstrip antenna is integrated on the transceiver circuits, so its dimension is just
. Also, to improve signal-to-noise-ratio performance by phase noise due to transmitter leakage signal, the phase-locked loop circuit is used. The measured results show that the heart rate and respiration accuracy was found to be very high for the distance of 50 cm without the additional digital signal processing.
The Performance Evaluation of Missile Warning Radar for GVES
Park, Gyu-Churl ; Hong, Sung-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1333~1339
DOI : 10.5515/KJKIEES.2009.20.12.1333
A MWR(Missile Warning Radar) of GVES(Ground Vehicle Equipment System) has to effectively decide the threat for a detected target. Linear Approximation Fitting(LAF) and Weighted Linear Approximation Fitting(WLAF) algorithm is proposed as algorithm for a threat decision method. The target is classified into a threat or non-threat using a boundary condition of the angular rate, and the boundary condition is determined using probability model simulation. This paper confirms the performance of proposed threat decision algorithm using measurement.
Developement of Planar Active Array Antenna System for Radar
Chon, Sang-Mi ; Na, Hyung-Gi ; Kim, Soo-Bum ; Lee, Jeong-Won ; Kim, Dong-Yoon ; Kim, Seon-Joo ; Ahn, Chang-Soo ; Lee, Chang-Hee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 20, issue 12, 2009, Pages 1340~1350
DOI : 10.5515/KJKIEES.2009.20.12.1340
The design and implementation of planar Active Phased Array Antenna System are described in this paper. This Antenna system operates at X-band with its bandwidth 10 % and dual polarization is realized using dual slot feeding microstrip patch antenna and SPDT(Single Pole Double Through) switch. Array Structure is
triangular lattice structure and each array is composed of TR(Transmit & Receive) module with more than 40 dBm power. Each TR module includes digital attenuator and phase shifter so that antenna beam can be electronically steered over a scan angle
. Measurement of antenna pattern is conducted using a near field chamber and the results coincide with the expected beam pattern. From these results, it can be convinced that this antenna can be used with control of beam steering and beam shaping.