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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 22, Issue 12 - Dec 2011
Volume 22, Issue 11 - Nov 2011
Volume 22, Issue 10 - Oct 2011
Volume 22, Issue 9 - Sep 2011
Volume 22, Issue 8 - Aug 2011
Volume 22, Issue 7 - Jul 2011
Volume 22, Issue 6 - Jun 2011
Volume 22, Issue 5 - May 2011
Volume 22, Issue 4 - Apr 2011
Volume 22, Issue 3 - Mar 2011
Volume 22, Issue 2 - Feb 2011
Volume 22, Issue 1 - Jan 2011
Selecting the target year
Planar Monopole Antenna with Modified Ground Plane for UWB Communications
Kim, Hyun-Chul ; Jung, Jin-Woo ; Lee, Hyeon-Jin ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 275~281
DOI : 10.5515/KJKIEES.2011.22.3.275
In this paper, we proposed the small planar monopole antenna with modified ground plane for UWB communications. The proposed antenna not only shows Ultra-Wideband characteristic(3.1~10.6 GHz) suitable for UWB communications but has partially notched-band characteristic to reject 5 GHz WLAN band(5.15~5.35 GHz, 5.470~5.825 GHz). The proposed antenna improved impedance matching through two slits on ground plane, and the rejection band was induced by two
/4 open stubs on center of two slits. Fabricated antenna satisfied VSWR
2 in 2.88~10.83 GHz except for the band rejection of 5.08~5.83 GHz.
Adaptive Modulation System Using SNR Estimation Method Based on Correlation of Decision Feedback Signal
Kim, Seon-Ae ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 282~291
DOI : 10.5515/KJKIEES.2011.22.3.282
Adaptive modulation(AM) is an important technique to increase the system efficiency, in which transmitter selects the most suitable modulation mode adaptively according to channel state in the temporary and spatially varying communication environment. Fixed modulation on channels with varying signal-to-noise ratio(SNR) is that the bit-errorrate(BER) probability performance is changing with the channel quality. An adaptive modulation scheme can be designed to have a BER which is constant for all channel SNRs. The correct as well as fast and simple SNR estimation is required essentially for this adaptive modulation. In order to operate adaptive modulation system effectively, in this paper, we analyze the effect of SNR estimation performance to it through the average BER and data throughput. Applying SNR estimation based on auto-correlation of decision feedback signal and others to adaptive modulation system, we also confirm performance degradation or improvement of its which is decided by SNR estimation error at each transition point of modulation level. Since SNR estimation based on auto-correlation of decision feedback signal shows stable estimation performance for various quadrature amplitude modulation(QAM) comparatively, this can be reduced degradation than others at each transition point of modulation level.
Voltage Controlled Injection-Locked Oscillator Design at 2.4 GHz Band for Wideband Applications
Yoon, Won-Sang ; Lee, Hun-Sung ; Lee, Hee-Jong ; Pyo, Seong-Min ; Kim, Young-Sik ; Han, Sang-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 292~298
DOI : 10.5515/KJKIEES.2011.22.3.292
In this paper, a voltage controlled injection-locked oscillator(VC-ILO) is proposed for wideband applications. From the control of the free-running frequency by a varactor diode, the wide frequency locking range can be obtained for low-level injected signals. The proposed VC-ILO is implemented on an FR-4 substrate with a thickness of 0.8 mm. The free-running frequencies of the oscillator is 2.39~2.52 GHz at the control voltage of 0~5 V. While the frequency locking range of over 50 MHz is presented for -10 dBm injected signal level at a fixed frequency, the locking range of over 90 MHz can be achieved for -30 dBm by controlling the free-running frequency.
Effect of System Instability Factors in a Bistatic MTI Radar Using Pulse Chasing Scan Method
Yang, Jin-Mo ; Han, Il-Tak ; Lee, Yong-Suk ; Lee, Min-Joon ; Kim, Whan-Woo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 299~311
DOI : 10.5515/KJKIEES.2011.22.3.299
In this paper, we have identified the system instability factors in a bistatic radar system using pulse chasing and considered their effects on the bistatic receiver`s MTI(Moving Target Indication) improvement performance. The pulse chasing is a scan method that searchs a restricted area on the transmit pulse-to-pulse basis and the MTI filter is a signal processing that separates a target from some kinds of interferences such as clutter using small number of transmit pulses. Ideal MTI processing performance, e.g., clutter attenuation and improvement, has been limited by the property of the clutter itself, however, the MTI performance in a proposed bistatic receiver configuration could be affected by the receiving beam pointing error during pulse chasing scanning. Also, for the bistatic receiver, we have defined other system instability factors, which result from the time synchronization error, COHO`s phase error, the frequency/phase synchronization error, and have analyzed their effects on the system performance improvement.
A Design of New Digital Adaptive Predistortion Linearizer Algorithm Based on DFP(Davidon-Fletcher-Powell) Method
Jang, Jeong-Seok ; Choi, Yong-Gyu ; Suh, Kyoung-Whoan ; Hong, Ui-Seok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 312~319
DOI : 10.5515/KJKIEES.2011.22.3.312
In this paper, a new linearization algorithm for DPD(Digital PreDistorter) is suggested. This new algorithm uses DFP(Davidon-Fletcher-Powell) method. This algorithm is more accurate than that of the existing algorithms, and this method renew the best-fit value in every routine with out setting the initial value of step-size. In modeling power amplifier, the memory polynomial model which can model the memory effect of the power amplifier is used. And the overall structure of linearizer is based on an indirect learning architecture. In order to verify for performance of proposed algorithm, we compared with LMS(Least Mean-Squares), RLS(Recursive Least squares) algorithm.
Electromagnetic Scattering by a Two-Dimensional Periodic Array of Small Resonant Apertures
Ko, Ji-Hwan ; Lee, Jong-Ig ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 320~326
DOI : 10.5515/KJKIEES.2011.22.3.320
Comparative study on the total transmission(zero reflection) has been done between two FSS structures which are coqmposed of the resonant aperture and the nonresonant aperture. It has been found that, the FSS of the resonant aperture has much larger ratio
/T of wavelength
to array periodicity T than that of the FSS of the nonresonant aperture for the total transmission(or zero reflection). Also the operating frequency can be made to be significantly reduced by using such a resonant structure. This physical situation is thought to be similar to that of EOT(Extraordinary Optical Transmission) phenomenon, in optics area.
Analysis of the Radar Cross Section of an X-band Active Transponder
Hwang, Ji-Hwan ; Kwon, Soon-Gu ; Won, Joong-Sun ; Oh, Yi-Sok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 327~335
DOI : 10.5515/KJKIEES.2011.22.3.327
A study on the RCS of a self-manufactured active transponder, which has a manually adjustable RCS, for SAR(Synthetic Aperture Radar) external calibration and image analysis at X-band is presented in this paper. The RCS of the active transponder was comparably analyzed using the lab-test and the COSMO-SkyMed SAR system, and also precisely analyzed the difference between the adjusted and estimated RCSs. A maximum RCS of the designed and manufactured active transponder is 60 dBsm. The active transponders with 60 dBsm and the adjusted RCS of 40 dBsm were measured using the single target calibration technique(STCT) and 2D target scanning technique(2DTST). And the extracted RCS using power-spill integration technique in a SAR image was compared with the measured RCS of active transponder. The comparison results show that the measured and extracted RCSs are 59.7 dBsm, 40.2 dBsm and 57.3 dBsm, 39.2 dBsm, respectively.
Study on the Radiation Pattern of Radiated Emission above 1 GHz
Chung, Yeon-Choon ; Lee, Soon-Yong ; Kwun, Suk-Tai ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 336~344
DOI : 10.5515/KJKIEES.2011.22.3.336
The purpose of this study is to analyze the radiation-pattern characteristics above 1 GHz for the electromagnetic wave radiated from multi-slot such as ventilations, etc. on the enclosure of an EUT and so to make recommendations for suitable test methods. An experimental EUT was formed by putting a comb-generator at the center of a rectangular enclosure with 4 slots, and its radiation pattern was analyzed in the frequency range of 1~6 GHz. As analysis results, multi-lobe appears above 2 GHz and the number of multi-lobes is growing as the frequency increases. And real radiated-emission measurements were performed for the experimental EUT by scanning a receiving antenna in the height of 1~4 m and tilting toward maximum radiation, as well as setting the height of a receiving antenna to the central position of the EUT which is prescribed at the present standards. The measured results are +12.8 dB in the scanning and +16.4 in the scanning and tilting compared with the present standard test method. Therefore, the latter must be revised in order to consider the radiation pattern above 1 GHz.
H-Band(220~325 GHz) Transmitter and Receiver for an 1.485 Gbit/s Video Signal Transmission
Chung, Tae-Jin ; Lee, Won-Hui ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 345~353
DOI : 10.5515/KJKIEES.2011.22.3.345
An 1.485 Gbit/s video signal transmission system using the carrier frequency of H-band(220~325 GHz) was implemented and demonstrated for the first in domestic. The RF front-end was composed of Schottky barrier diode sub-harmonic mixers(SHM) and frequency triplers, and diagonal horn antennas for transmitter and receiver, respectively. The transmitted carrier frequency of 246 GHz was implemented in the H-band, and LO frequencies of H-band SHM is 120 GHz and 126 GHz for transmit and receive chains, respectively. The modulation scheme is ASK(Amplitude Shift Keying) where IF frequency is 5.94 GHz and the envelop detection was used in heterodyne receiver architecture, and direct detection receiver using ZBD(Zero Bias Detector) was implemented as well. The 1.485 Gbit/s video signal with HD-SDI format was successfully transmitted over wireless link distance of 5 m and displayed on HDTV at the transmitted average output power of 20
A Novel Cooperative Communication to Achieve Secondary Spectrum Access Using Adaptive Incremental Decode-and-Forward(AIDF) Protocol
Kim, Lyum ; Kong, Hyung-Yun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 354~361
DOI : 10.5515/KJKIEES.2011.22.3.354
In this paper, we propose a spectrum sharing system that enable secondary user`s spectrum access in cooperative communication scheme. At phase 1, a transmitter in primary system broadcasts signals to the rest nodes. And then, at phase 2, a transmitter in secondary system combines the decoded signals after received from a transmitter in primary system and its own signal. And then transmitter of secondary system broadcasts the combined signals to receivers of primary and secondary systems. At this time, due to the process of combining signals, receivers of primary and secondary systems experiences a performance degradation. Therefore, we propose a novel adaptive incremental decode-andforward(AIDF) protocol to overcome this problem. By using AIDF protocol, we show performance improvement of total system through various simulations.
K-Band Radar Development for the Ground Moving Vehicle
Lee, Jong-Min ; Cho, Byung-Lae ; Sun, Sun-Gu ; Lee, Jung-Soo ; Park, Sang-Soon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 362~370
DOI : 10.5515/KJKIEES.2011.22.3.362
This paper presents a K-band radar system installed on the ground moving vehicle to detect and track a high-speed target. The presented radar is separated into three search regions to satisfy a wide area detection and a limitation of the installing space of the radar, and each region performs detecting the target independently and tracking the detected target automatically. The presented radar radiating K-band FMCW waveform acquires range and velocity information of the target at the every dwell and receiving antenna of the radar is applied the multiple baseline interferometer to extract the precise angle information of the target. 3-dimensional tracking accuracy of the radar is 0.25 m RMSE measured actually through a fire experiment of an imitation target.
Design and Measurement of Active Phased Array Radar Digital Receiver
Kim, Tae-Hwan ; Lee, Sung-Ju ; Lee, Dong-Hwi ; Hong, Yun-Seok ; Cho, Choon-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 371~379
DOI : 10.5515/KJKIEES.2011.22.3.371
Active phased array antenna structure is used for modern multi-function radars. To search targets in high clutter environment, the radar receiver needs high dynamic range performance. Though active phased array antenna structure lead to increase of SNR, the SFDR is not increased. In this paper, high SFDR receiver of X-band active phased array radar was designed and manufactured. One channel digital receiver is connected to 32 T/R modules and one PCB assembly is composed to 2 channel digital receivers with RF part, ADC part, LO distribution part and digital down conversion part. A commercial FIFO board was used for digital receiver measurement about major performance in digital output signal condition. The measured digital receiver gain and SFDR is 33 dB and more than 81 dBc each.
A Development of the X-Band 63 Watt Pulsed SSPA for Radar
Chong, Min-Kil ; Na, Hyung-Gi ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 380~388
DOI : 10.5515/KJKIEES.2011.22.3.380
In this paper, we developed the X-band 63 watt pulsed SSPA(Solid State Power Amplifier) by using HMIC(Hybrid Microwave Integrated Circuits). The pulsed SSPA consists of power supply and 3-stage amplifier modules : pre-amplifier stage, driver-amplifier stage, final-amplifier stage. The developed pulsed SSPA provides more than 63 watts of output power with a short pulse width and the duty cycle of up to 1.2 % at
. The fabricated module offers great than 37 dB of saturated gain across the operating band. Input and output VSWR is <1.5:1. This module has an average current of 400 mA typical and operates at a +28
supply. The developed SSPA in this paper can apply to pulsed Doppler radar with high speed operation.
A Design and Fabrication of a Compact Ka Band Transmit/Receive Module Using a Quad-Pack
Oh, Hyun-Seok ; Yeom, Kyung-Whan ; Chong, Min-Kil ; Na, Hyung-Gi ; Lee, Sang-Joo ; Lee, Ki-Won ; Nam, Byung-Chang ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 389~398
DOI : 10.5515/KJKIEES.2011.22.3.389
In this paper, the design and fabrication of a transmit/receive(T/R) module for Ka-band phased array radar is presented. A 5bit digital phase shifter and digital attenuator were used in common for both transmitter and receiver considering unique Ka-band characteristic. The circulator was excluded in the T/R module and was placed outside T/R module. The transmitting power per element antenna is designed to be about 1 W and the noise figure is designed to be below 8 dB. The designed T/R module RF part has a compact size of
. In order to implement the T/R module, MMICs used in T/R module was separately assessed before assembly of the designed T/R module. The transmitter of the fabricated T/R module shows about 1 W at 5 dBm unit module input power and the receiver shows a gain of about 20 dB and a noise figure of below 8 dB as expected in the design stage.
Design of Q-Band LC VCO and Injection Locking Buffer 77 GHz Automotive Radar Sensor
Choi, Kyu-Jin ; Song, Jae-Hoon ; Kim, Seong-Kyun ; Cui, Chenglin ; Nam, Sang-Wook ; Kim, Byung-Sung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 22, issue 3, 2011, Pages 399~405
DOI : 10.5515/KJKIEES.2011.22.3.399
In this paper, we present the design of Q-band LC VCO and injection locking buffer for 77 GHz automotive radar sensor using 130 nm RF CMOS process. To improve the phase noise characteristic of LC tank, the transmission line is used. The negative resistance by the active device cross-coupled pair of buffer is used for high output power, with or without oscillation of buffer. The measured phase noise is -102 dBc/Hz at 1 MHz offset frequency and tuning range is 34.53~35.07 GHz. The output power is higher than 4.1 dBm over entire tuning range. The fabricated chip size is
. The power consumption of LC VCO is 10.8 mW and injection locking buffer is 50.4 mW from 1.2 V supply.