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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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The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 27, Issue 8 - Sep 2016
Volume 27, Issue 7 - Aug 2016
Volume 27, Issue 6 - Jul 2016
Volume 27, Issue 5 - Jun 2016
Volume 27, Issue 4 - Apr 2016
Volume 27, Issue 3 - Mar 2016
Volume 27, Issue 2 - Feb 2016
Volume 27, Issue 1 - Jan 2016
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High Power Cavity Type Tunable Filter Using Switch for 1.5 GHz Band
Ahn, Sehoon ; Lee, Minho ; Park, Jongcheol ; Jeong, Gyetaek ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 1~7
DOI : 10.5515/KJKIEES.2016.27.1.1
In this paper, the tunable filter based on high power cavity using mechanical switch for 1.5 GHz band is presented. The LPF is inserted to eliminate the spurious wave, coupler is embeded to extract the output power, and then the tunable filter system is configured using mechanical switch. The LPF obtains attenuation over 40 dB between 4 GHz and 12.75 GHz, Coupler is satisfied with coupling value 40 dB and coupling isolation over 55 dB. The tunable filter system using mechanical switch obtains insertion loss 0.88 dB at bypass mode between 1,495.9 MHz and 1,510. 9 MHz, 3.29 dB at fil mode between 1,495.9 MHz and 1,500.9 MHz. It is also satisfied with output power of 132 W at the center frequency 1,498.4 MHz, and switching time below 10 ms.
Dipole- and Loop-Mode Transformable Origami Paper Antenna
Lee, Dongju ; Seo, Yunsik ; Lim, Sungjoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 8~13
DOI : 10.5515/KJKIEES.2016.27.1.8
A pattern-switchable origami antenna is designed with paper using inkjet-printing technology. The proposed antenna can be switched between loop and dipole antenna modes by folding and unfolding the paper, respectively. The proposed antenna is designed for the resonant frequencies of both modes to be 1.85 GHz. Eutectic gallium-indium liquid metal is introduced in order to avoid cracks in the conductive ink when the paper is folded. The performance of the proposed antenna is demonstrated through simulation and measurement results and antenna gain of dipole-mode and loop-mode are -4 dBi and -5 dBi, respectively. Also, the nulls of both dipole and loop modes compensate nulls from each mode.
Wideband Slot Antenna with Corrugated Structure
Kim, Taewon ; Yoon, Sungjoon ; Lee, Heejae ; Choi, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 14~19
DOI : 10.5515/KJKIEES.2016.27.1.14
In this paper, a wideband slot antenna with corrugated structure antenna is proposed. The proposed antenna consists of a ground plane with corrugated slot and microstrip feed-line. Even with a limited dimension of
, the proposed antenna has wide bandwidth due to the longer current path formed by the corrugated slot structure. Measured bandwidth(10 dB return loss) and fractional bandwidth of the proposed antenna are 2,180 MHz(2.5~4.68 GHz) and 60.7 % at the center frequency of 3.59 GHz. The proposed antenna has an omni-directional radiation pattern and measured gains and average efficiency were 3.48~5.83 and dBi, 81.55 %, respectively.
Design of Two-Stage X-Band Power Amplifier Using GaN-HEMT
Lee, Wooseok ; Lee, Hwiseob ; Park, Seungkuk ; Lim, Wonseob ; Han, Jaekyoung ; Park, Kwanggun ; Yang, Youngoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 20~26
DOI : 10.5515/KJKIEES.2016.27.1.20
This paper presents an X-band two-stage power amplifier using GaN-HEMT. Two-stage structure was adopted to take its high gain and simple inter-stage matching network. Based on a 3D EM simulation, the bond-wire inductance and the parasitic capacitance were predicted. By reducing bond-wire inductance, Q of the matching network is decreased and the bandwidth is improved. The implemented two-stage PA shows a power gain of more than 16 dB, saturated output power of more than 42.5 dBm, and a efficiency of more than 35 % in frequency range of 8.1~8.5 GHz with an operating voltage of 40 V.
Channel Estimation Using Virtual Pilot Signal for MIMO-OFDM Systems
Seo, Heejin ; Park, Sunho ; Kim, Jinhong ; Shim, Byonghyo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 27~32
DOI : 10.5515/KJKIEES.2016.27.1.27
In this paper, we proposed a soft decision-directed channel estimation based on MMSE estimation for MIMO-OFDM system. While the conventional method employs only pilot signals for channel estimation, the proposed algorithm performs channel estimation using pilot and reliable data signals. We also proposed selection criterion among reliable data signal for channel estimation. From numerical simulations, we show that the proposed channel estimator achieves 1 dB performance gain over conventional channel estimators.
Definition of Minimum Performance Requirements for RFID Tags Embedded Inside a Pair of Shoes
Kwon, Jongwon ; Song, Taeseung ; Cho, Wonseo ; Kim, Jaeuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 33~41
DOI : 10.5515/KJKIEES.2016.27.1.33
Radio Frequency Identification(RFID) can provide visibility and efficiency throughout the entire supply chain in fashion apparel and footwear. The technical analysis of RFID performance is necessarily required to create a sealess omni-channel service using customer experience. Especially, several tagged-item performance specifications, for example read range and multi-read rate, strongly depend on the attached material and real-operating environment. This paper suggests minimum performance requirements for RFID tags embedded inside a pair of shoes to negotiate tagged-item performance between retailers and suppliers.
Design and Fabrication of a C-Band Delay Line Instantaneous Frequency Measurement Receiver with Offset Voltage Compensation
Jeon, Moon-Su ; Jeon, Yeo-Ok ; Seo, Won-Gu ; Bae, Kyung-Tae ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 42~49
DOI : 10.5515/KJKIEES.2016.27.1.42
In this paper, we design and fabricate an instantaneous frequency measurement receiver with a frequency resolution of 125 MHz which detects and measures continuous signals in 4~6 GHz using path difference of delay lines. The receiver has a 4-bit configuration and consists of power dividers, delay lines, power combiners, power detectors, voltage comparator circuits and so on. The accuracy of the instantaneous frequency measurement is improved by applying offset voltage compensation to the comparator circuits to compensate the frequency-dependent path loss of the delay line and the frequency dependence of power detection.
A Design of Power Amplifier with Broadband and High Linearity for 4G Application in 0.11 μm CMOS Process
Kim, Ki-Hyun ; Ko, Jae-Yong ; Nam, Sang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 50~59
DOI : 10.5515/KJKIEES.2016.27.1.50
This work shows that the design and test results of a power amplifier(PA) with broadband and high linearity for 4G applications in
CMOS process. A 1:2-transformer is designed for load impedance matching of PA and a inter-stage matching is implemented for a linearity. A designed PA achieves more than 27.3 dBm of linear output power and 26.1 % of power-added efficiency(PAE) under an adjacent channel leakage ratio(ACLR) of -30 dBc for a LTE 16-QAM 10 MHz signal with a carrier frequency range of 1.8 to 2.3 GHz.
Inductor-less 6~18 GHz 7-Bit 28 dB Variable Attenuator Using 0.18 μm CMOS Technology
Na, Yun-Sik ; Lee, Sanghoon ; Kim, Jaeduk ; Lee, Wangyoung ; Lee, Changhoon ; Lee, Sungho ; Seo, Munkyo ; Lee, Sung Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 60~68
DOI : 10.5515/KJKIEES.2016.27.1.60
This paper presents a 6~18 GHz 7-bit digital-controlled attenuator. The proposed attenuator is based on switched-T architecture, but no inductor is used for minimum chip size. The designed attenuator was fabricated using
CMOS process, and characterized using on-wafer testing setup. The resolution(minimum attenuation step) and the maximum attenuation range of the attenuator were measured to be 0.22 dB and 28 dB, respectively. The measured RMS attenuation error and the RMS phase error for 6~18 GHz were less than 0.26 dB and
, respectively. The reference state insertion loss was less than 12.4 dB at 6~18 GHz. The measured input and output return losses were better than 9.4 dB over all frequencies and attenuation states. The chip size is
A Study on the Rotational Motion Compensation Method for ISAR Imaging
Kang, Byung-Soo ; Bae, Ji-Hoon ; Chung, Sung-Eun ; Kim, Chan-Hong ; Kim, Kyung-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 69~75
DOI : 10.5515/KJKIEES.2016.27.1.69
In this paper, we propose a inverse synthetic aperture radar(ISAR) rotational motion compensation(RMC) method to remove residual blurring caused by non-uniform rotational motion of a target. First, a range bin having an isolated scatterer is selected. Next, polynomial phase signal in the selected range bin is estimated by using both Fourier transform(FT) and polynomial-phase transform(PPT). Finally, a new slow time variable that uniformly samples radar signal along the aspect angle directions is defined by using the estimated phase signal, and we interpolate radar signal in terms of the new time variable. As a result, rotational motion to blurr ISAR images is removed, and focused ISAR images are obtained. Simulation results using battleship model validate the robustness and effectiveness of our proposed RMC method.
0.25 μm AlGaN/GaN HEMT Devices and 9 GHz Power Amplifier
Kang, Dong-Min ; Min, Byoung-Gue ; Lee, Jong-Min ; Yoon, Hyung-Sup ; Kim, Sung-Il ; Ahn, Ho-Kyun ; Kim, Dong-Young ; Kim, Hae-Cheon ; Lim, Jong-Won ; Nam, Eun-Soo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 76~79
DOI : 10.5515/KJKIEES.2016.27.1.76
This paper describes the successful development and the performance of X-band 50 W pulsed power amplifier using a 50 W GaN-on-SiC high electron mobility transistor. The GaN HEMT with a gate length of
and a total gate width of 12 mm were fabricated. The X-band pulsed power amplifier exhibited an output power of 50 W with a power gain of 6 dB in a frequency range of 9.2~9.5 GHz. It also shows a maximum output power density of 4.16 W/mm. This 50 W GaN HEMT and X-band 50 W pulsed power amplifier are suitable for the radar systems and related applications in X-band.
Simplification of Device-Triggered Reporting Procedure on 3GPP GERAN Cellular IoT Communications
Kim, Jun Suk ; Shin, Jung Wan ; Chung, Min Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 80~83
DOI : 10.5515/KJKIEES.2016.27.1.80
In this paper, a simplified uplink transmission procedure is proposed for reducing energy consumption and improving lifetime of CIoT devices. In the proposed procedure, the CIoT devices register information on their service and traffic to the networks, and the networks statically allocate pre-defined amounts of radio resources when the CIoT devices have requested permission for their uplink transmissions. This paper provides details of the proposed procedure comparing with those of the current GSM procedure, and defines detailed operations of the devices and the networks for the proposed one. This shows that the proposed scheme can effectively support CIoT services on GSM networks.
Design and Implementation of a 100 W Receiver for Wireless Power Transfer Using Coupled Magnetic Resonance
Kim, Seong-Min ; Cho, In-Kui ; Choi, Hyun-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 84~87
DOI : 10.5515/KJKIEES.2016.27.1.84
In this paper, a receiver for wireless power transfer is proposed. The receiver consists of a 100 W rectifier in 1.8 MHz frequency band, and a constant current charger. In particular, two kinds of protection circuits are installed in the rectifier. They are a over-voltage protection circuit which block the input voltages greater than 30 V and a active-dummy load which maintains the receiver input impedance by automatically consuming the remaining input power. The constant current charger is designed to charge the battery with a charging current of up to 1 A. A wireless charging system is fabricated using the proposed receiver. The system is composed of a 130 W transmitter, two magnetic resonator, and proposed receiver for charging a 48 V Li-Ion battery using the coupled magnetic resonance method. By the measurement result, the system efficiency is about 54 %.
Real-Time Frequency Interference Analysis System for Performance Degradation Analysis of MIMO-OFDM WLAN Due to WPAN Interferer
Yoon, Hyungoo ; Park, Jin-Soo ; Jang, Byung-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 88~91
DOI : 10.5515/KJKIEES.2016.27.1.88
In this paper, we have proposed the frequency interference analysis system using both LabVIEW and Universal Software Radio Peripheral(USRP) for performance degradation analysis of Multi Input Multi Output-Orthogonal Frequency Division Multiplexing(MIMO-OFDM) Wireless Local Area Network(WLAN) due to Wireless Local Area Network(WPAN) interferer. The proposed system consists of three part, i.e., victim, channel, and interferer. Both victim and interferer are implemented by LaBVIEW and a USRP board. Then interfering signal and additive white Gaussian noise are combined with the wanted signals of a victim. Measured Bit Error Rate(BER) at the victim receiver is compared with theoretical BER according to various signal to interference plus noise power ratio (SINR) values. Measured and theoretical BER curves show good agreement.
UHF-Band 1 kW Solid State Pulsed Power Amplifier for Thermoacoustic Imaging Application
Lee, Seung-Min ; Park, Seung-Pyo ; Choi, Seung-Bum ; Lee, Moon-Que ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 92~95
DOI : 10.5515/KJKIEES.2016.27.1.92
In this paper, an UHF-band 1 kW solid-state pulsed power amplifier was designed and implemented for the thermoacoustic imaging(TAI) at 900 MHz. The designed power amplifier has a pulse width of
and a duty cycle of 1 % for short-pulse operation. The overall amplifier was implemented by combining of 16 single-power amplifiers adopting MRFE6P9220HR3 LDMOSFET using wilkinson power dividers. The solid-state pulsed power amplifier shows 25 % drain efficiency with a gain of 76.2 dB when the output power is 60.2 dBm for a -16 dBm input power at center frequency.
Analysis of Bistatic Clutter Structure through Simulation
Jeon, Hyeon-mu ; Chung, Yong-Seek ; Chung, Won-zoo ; Kim, Jong-mann ; Yang, Hoon-Gee ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 1, 2016, Pages 96~99
DOI : 10.5515/KJKIEES.2016.27.1.96
Generally, bistatic clutter, contrary to the monostatic clutter, has nonlinear structure in Angle-Doppler domain due to the noncooperative motion of the transmitter and the receiver. In this paper, we first simulate the bistatic clutter structure resulting from the relative motion of the transmitter and the receiver and then analyze their relations through the bistatic clutter structure in Angle-Doppler domain. Also, we show the operation condition of the transmitter and the receiver leading to low rank of a covariance matrix of the bistatic clutter.