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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 21, Issue 12 - Dec 2010
Volume 21, Issue 11 - Nov 2010
Volume 21, Issue 10 - Oct 2010
Volume 21, Issue 9 - Sep 2010
Volume 21, Issue 8 - Aug 2010
Volume 21, Issue 7 - Jul 2010
Volume 21, Issue 6 - Jun 2010
Volume 21, Issue 5 - May 2010
Volume 21, Issue 4 - Apr 2010
Volume 21, Issue 3 - Mar 2010
Volume 21, Issue 2 - Feb 2010
Volume 21, Issue 1 - Jan 2010
Selecting the target year
Design of Solid-State Transmitter and Receiver for Active Array Radar System
Lee, Yu-Ri ; Kim, Jong-Pil ; Lee, Soo-Ho ; Jeong, Myung-Deuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1335~1342
DOI : 10.5515/KJKIEES.2010.21.12.1335
This paper presents design and measurement result of S-band,
kW solid-state transmitter and receiver for active array radar system. Transmitter characteristics show 63 dB gain, 200 usec pulse width(max.), 10 % duty(max.) and 63 dB pulse to pulse stability. Receiver characteristics show 23 dB gain and 3.2 dB noise figure. Receiving mode for pulse network analyzer is used for pulse to pulse stability measurement. Measurement results satisfies all specification.
Design and Implementation of Plannar S-DMB Antenna with Omni-Directional Radiation Pattern Using Metamaterial Technique
An, Chan-Kyu ; Yu, Ju-Bong ; Jeon, Jun-Ho ; Kim, Woo-Chan ; Yang, Woon-Geun ; Nah, Byung-Ku ; Lee, Jae-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1343~1351
DOI : 10.5515/KJKIEES.2010.21.12.1343
In this paper, a novel patch antenna based on the metamaterial CRLH(Composite Right- and Left-Handed) structure is designed, implemented, and measured. Contrary to the standard microstrip patch's fundamental resonance mode of half-wavelength or its positive multiple, the proposed antenna shows the in-phase electric field over the entire antenna. The proposed antenna has a desired omni-directional field pattern which is typical characteristic of
monopole antenna, and also shows the merit of low profile. HFSS(High Frequency Structure Simulator) of Ansoft which is based on the FEM(Finite Element Method) is used to simulate the proposed antenna. FR-4 substrate of thickness 1.6 mm and relative permitivity 4.4 is used for the proposed antenna implementation. The implemented antenna showed VSWR (Voltage Standarding Wave Ratio)
2 for the frequency band from 2.63 GHz to 2.655 GHz which is used for S-DMB (Satellite-Digital Multimedia Broadcasting) service. And measured peak gain and efficiency are 2.65 dBi and 81.14 %, respectively.
On Reducing the Shadow Region for Extending the Service Area of TBN-Jeonju Broadcasting
Kim, Tae-Hoon ; Lee, Moon-Ho ; Lee, Mi-Sung ; Cho, Kye-Mun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1352~1370
DOI : 10.5515/KJKIEES.2010.21.12.1352
In this paper, we investigated the shadow area of radio programs which are currently being broadcast via FM 102.5 MHz in Jeollabuk-do consisting of 6 cities and 8-guns. The field strength data of FM 102.5 MHz was used with criterion of shadow area. As a result, the field strength of the eastern mountainous area in Jeollabuk-do was very low. We also measured, compared and analyzed the field strength of 102.5 MHz(TBN-Jeonju), 100.7 MHz(KBS) and 99.1 MHz (MBC) in Jeollabuk-do. Based on the field strength data, we tried to find what correlation exists and how much influence is between difference of antenna output power and solution of shadow area. In result, enhancement of antenna output power is not solution in terms of reducing the shadow Area of 102.5 MHz(TBN-Jeonju). In addition, we measured, compared and analyzed the field strength of 102.5 MHz(TBN-Jeonju) and 106.9 MHz(EBS). In fact, the relay stations with 104.1 MHz, 104.9 MHz, 105.3 MHz and 107.5 MHz of EBS FM has a number of FM relay stations in the eastern mountainous area of Jeollabuk-do. As a result, we confirmed that EBS almost did not have shadow area in the eastern mountainous area of Jeollabuk-do based on the field strength data. As in the case of EBS and KBS, we suggest installing TBN-Jeonju FM relay station with the best solution to reducing the shadow area to extend the audible range of TBN-Jeonju.
Analysis of Impulse Dispersion for IR-UWB Antenna Using Time-Frequency Analysis
Koh, Young-Mok ; Ra, Keuk-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1371~1379
DOI : 10.5515/KJKIEES.2010.21.12.1371
This paper presents an analysis of impulse dispersion for impulse radio ultra-wide band(IR-UWB) antenna. A set of antenna structure configurations are highlighted with verification based on the STFT(Short Time Fourier Transform) in 3.1~5.1 GHz: first, a taper-slotted antenna allowing the optimal impulse transmission, and second, 4 types of the omni-directional IR-UWB antenna using different feed structures(microstrip line, and CPW(Coplanar Waveguide)). The proposed STFT allows the analysis of the IR-UWB antenna's dispersion characteristic.
Development of Planar Active Electronically Scanned Array(AESA) Radar Prototype for Airborne Fighter
Chong, Min-Kil ; Kim, Dong-Yoon ; Kim, Sang-Keun ; Chon, Sang-Mi ; Na, Hyung-Gi ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1380~1393
DOI : 10.5515/KJKIEES.2010.21.12.1380
This paper presents a design, fabrication and the test results of planar active electronically scanned array(AESA) radar prototype for airborne fighter applications using transmit/receive(T/R) module hybrid technology. LIG Nex1 developed a AESA radar prototype to obtain key technologies for airborne fighter's radar. The AESA radar prototype consists of a radiating array, T/R modules, a RF manifold, distributed power supplies, beam controllers, compact receivers with ADC(Analog-to-Digital Converter), a liquid-cooling unit, and an appropriate structure. The AESA antenna has a 590 mm-diameter, active-element area capable of containing 536 T/R modules. Each module is located to provide a triangle grid with
spacing among T/R modules. The array dissipates 1,554 watts, with a DC input of 2,310 watts when operated at the maximum transmit duty factor. The AESA radar prototype was tested on near-field chamber and the results become equal in expected beam pattern, providing the accurate and flexible control of antenna beam steering and beam shaping.
PSPM System for Low Power Communication and Performance Analysis in Multipath Channel
Choi, Jae-Hoon ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1394~1400
DOI : 10.5515/KJKIEES.2010.21.12.1394
In this paper, we analyze performance of PSPM(Phase Shift Position Modulation) modulation scheme in multi-path channel. A PSPM modulation method transmits the information data by both PSK symbol data and symbol position data, so that we can significantly improve the power efficiency. The bandwidth efficiency of PSPM is quarter than PSK but improve BER performance, because increasing symbol hamming distance. In this results, a PSPM scheme is bandwidth efficiency better than FSK and power efficiency better than PSK. This characteristic can be useful in WBAN and wireless sensor networks also PSPM modulation method can be expected high throughput than existing FSK. In this paper, we compare PSPM, PSSK and PSK regard to BER performance and throughput in multi-path channel.
Limits of Fully Anechoic Room for Radiated Disturbance Using Correlation Factor
Lee, Soon-Yong ; Chung, Yeon-Choon ; Choi, Jea-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1401~1411
DOI : 10.5515/KJKIEES.2010.21.12.1401
In this paper, we suggested the tolerance limits of FAR(Fully Anechoic Room) using correlation factor between OATS(Open area Test Site) to measure EMI(Electromagnetic Interference) and FAR to measure EMS(Electromagnetic Susceptibility). FAR Project(SMT4-CT96-2133), CISPR/A/665/DTR, and CISPR A/665/DTR documents are analyzed and theoretical correlation factor based on the documents and theoretical equations is drawn. To obtain the experimental correlation factor, EUT(Equipment Under Test) is fabricated as well as measured at the 10 m distance OATS and in the 3 m distance FAR. Also, to suggest the tolerance limits of EUT with multi sources, radiation theory for electric and magnetic dipoles is programmed. We drew the correlation factor for EUT with multi sources through the programs. As the tolerance limits of FAR is newly defined, It can be used alternative test site for OATS to measure EMI, efficiently.
A Study on Receiving Beam Pointing Error and MTI(Moving Target Indication) Performance in a Bistatic Radar Using Pulse Chasing
Yang, Jin-Mo ; Lee, Min-Joon ; Kim, Whan-Woo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1412~1422
DOI : 10.5515/KJKIEES.2010.21.12.1412
A bistatic radar using the pulse chasing can detect a target to track successive transmitted pulses using a receive beam for effectively scanning the cosite search area. When tracking a transmitted pulse with the receive beam, some beam pointing errors within pulse-to-pulse can cause the timing error in received pulse and the variation of the signal strength. In this paper, we have proposed that some errors due to the receive beam pointing error could limit the MTI filter's performance and derived that the relationship between the MTI performance and the geometric factors which are the inherent properties in bistatic configuration. Through the simulation, we have considered the limitations of the improvement performance restricted by the receiving beam pointing error and confirmed the contribution to the performance improvement in maintaining the receiving beam pointing error of under 0.5 degrees.
Dual-Band Compact Broad Band-Pass Filter with Parallel Coupled Line
Choi, Young-Gu ; Shrestha, Bhanu ; Yoon, Ki-Cheol ; Lee, Jeong-Hun ; Hong, Tae-Ui ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1423~1431
DOI : 10.5515/KJKIEES.2010.21.12.1423
In this paper, the dual-band compact broad bandpass filter using parallel coupled line is proposed. The proposed filter has reduced size and can be controlled bandwidth. And it is also possible to operate in the dual-band purpose. Futhermore, the inserted bandstop fiilter with T-type configuration is also possible to operate in the same purpose. The dual-band bandpass filter has the first operating frequencies and its bandwidth which are 5.8 GHz and 60 % respectively and the second operating frequency and the bandwidth are 16.2 GHz and 60 % respectively. The insertion loss and the return loss of the first frequency has 0.4 dB and 17.4 dB and the insertion loss and the return loss of the second frequency has 0.62 dB and 19.8 dB, respectively.
Design of Bandpass Filter with a Single Dual-Mode Resonator
An, Jae-Min ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1432~1437
DOI : 10.5515/KJKIEES.2010.21.12.1432
This paper proposes a new design method of bandpass filter with single dual-mode resonator. In the proposed method, a coupling coefficient between two resonators was obtained by considering a dual-mode resonator as two single resonators. Based on the obtained coupling coefficient, two resonant frequencies of dual-mode resonator were calculated and then arranged according to a transmission zero's location of required filter. To verify the proposed theory, two WLAN bandpass filters which have a transmission zero to a lower and an upper stopband repectively were designed and implemented.
Comparison of the Characteristic of Multiple Meander-Line RFID Tag Antennas
Jung, Hak-Joo ; Lee, Sang-Woon ; Choo, Ho-Sung ; Park, Ik-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1438~1446
DOI : 10.5515/KJKIEES.2010.21.12.1438
In this paper, we compared and analyzed the antenna characteristics such as bandwidth, efficiency, and readable range in terms of the size and the number of turns of the multiple meander RFID tag antenna in the UHF band. The sizes of the each antenna are
. The bandwidths of the antennas for VSWR<5.8 are 857~963 MHz, 844~965 MHz, and 844~968 MHz which cover the worldwide UHF RFID bandwidth. The readable range of the antenna was greatly affected by the efficiency and gain of the antenna which depends on the size and the number of turns of the meander antenna.
Compact Dual-Band Bandpass Filter Using Two Dual-Mode Resonators
Kim, Kyoung-Keun ; Lee, Ja-Hyeon ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1447~1453
DOI : 10.5515/KJKIEES.2010.21.12.1447
In this paper, the design and the fabrication of dual-band bandpass filter using two dual-mode resonators is presented. Dual-mode resonator using a short stub is miniaturized by inter-digital capacitor and stepped impedance. Two dual mode resonators are designed to have different resonant frequencies, one for the lower passband and the other for the upper passband. Transmission zero is positioned at low or high rejection bands with a sharp skirt characteristic. Dual-band operation can be achieved using dual feeding structure. For WLAN, the proposed filter at 2.45/5.25 GHz is designed and fabricated. The size of the filter is as compact as 1
The Characteristic of Electric Field Penetration into Infinite Conducting Plane with an Aperture Due to HEMP Incidence
Lim, Byoung-Jin ; Jung, Sung-Woo ; Cho, Byung-Doo ; Kim, Ki-Chai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1454~1459
DOI : 10.5515/KJKIEES.2010.21.12.1454
This paper presents the comparison of electric field penetration in Bell laboratories and IEC 61000-2-9 standard when HEMP source penetrates through an aperture in a planar conducting plane of infinite extent. HEMP electric field distributions assume in order to interpret this problem. Integral equation is derived and solved by Galerkin's method of moments for calculating the penetrating electric field. It is shown that penetrated electric field of IEC 61000-2-9 standard is greater than the Bell Laboratories waveform in resonance of lower frequency band, but those waveforms are similar in shape to frequency domain.
Performance Comparison for Radar Target Classification of Monostatic RCS and Bistatic RCS
Lee, Sung-Jun ; Choi, In-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1460~1466
DOI : 10.5515/KJKIEES.2010.21.12.1460
In this paper, we analyzed the performance of radar target classification using the monostatic and bistatic radar cross section(RCS) for four different wire targets. Short time Fourier transform(STFT) and continuous wavelet transform (CWT) were used for feature extraction from the monostatic RCS and the bistatic RCS of each target, and a multi-layered perceptron(MLP) neural network was used as a classifier. Results show that CWT yields better performance than STFT for both the monostatic RCS and the bistatic RCS. And, when STFT was used, the performance of the bistatic RCS was slightly better than that of the monostatic RCS. However, when CWT was used, the performance of the monostatic RCS was slightly better than that of the bistatic RCS. Resultingly, it is proven that bistatic RCS is a good cadndidate for application to radar target classification in combination with a monostatic RCS.
A Design of X-Band Tile Type Active Transmit/Receive Module
Ha, Jung-Hyen ; Moon, Ju-Young ; Lee, Ki-Won ; Nam, Byung-Chang ; Yun, Sang-Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 12, 2010, Pages 1467~1474
DOI : 10.5515/KJKIEES.2010.21.12.1467
A tile type active T/R(Transmit/Receive) module for X-band active array radar is demonstrated in this paper. Proposed tile type structure based on fuzz button solderless vertical interconnection shows wide band characteristic of about 30 % bandwidth in X-band with insertion loss of below 0.6 dB and input and output VSWR of less than 1.7. Moreover, the mismatching generally appeared in the vertical interconnection which shown wide band characteristic can also be minimized and, therefore, good gain flatness can be achieved.