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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 UWB Tapered Slot Antenna for the Optimum Impulse Radio Transmitting & Receiving
Koh, Young-Mok ; Ra, Keuk-Hwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 553~563
DOI : 10.5515/KJKIEES.2010.21.6.553
This paper presents a tapered slot-antenna(TSA) for optimal impulse-signal transmission in ultra-wide band(UWB). The proposed TSA provides radiates in end-fire direction, which meets an impulse-radio UWB(IR-UWB) system demands(e.g., low loss, thus less error throughout the UWB band). In order to minimize the pulse distortion, we used an wideband impedance transformer and a microstrip slotline. The pulse fidelity characteristics was evaluated with finite-difference time-domain(FDTD) analysis technique and pulse fidelity correlation equation. Approximately 93.89 % pulse fidelity was obtained between the two antennas in 0.5 m range. Additionally, derived chirp Z-transform algorithm enables us to utilize the zoom-in option on the pulse signal in few nano-seconds below. Thus, it is possible to analyze the pulse signal distortion, delay or dispersion characteristics.
Study on Arrangement of Self-Resonant Coils in Wireless Power Transfer System Based on Magnetic Resonance
Kim, Jin-Wook ; Ji, Hyeon-Ho ; Choi, Yeon-Gyu ; Yun, Young-Hyun ; Kim, Kwan-Ho ; Park, Young-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 564~572
DOI : 10.5515/KJKIEES.2010.21.6.564
In this paper, characteristics on arrangement of coils in the wireless power transfer system based on magnetic resonance is presented. A helical structure is used for a self-resonant coil. To design a proper self-resonant helical coil, its inductance and capacitance are obtained. Using the finite element method, the self-resonant coil designed is simulated and characteristics of wireless power transfer with various arrangement between Tx and Rx resonant coils is analyzed. For verification, a prototype of a wireless power transfer system based on magnetic resonance is fabricated and efficiency of different arrangement such as both vertical and parallel arrangements is measured. From the measurement, transmission efficiency of 50 % for parallel arrangement is obtained within twice the diameter of the coil while for the vertical arrangement it is measured within one and a half diameter of the coil. Maximum efficiency of 84.25 % is observed at the distance 40 cm from the resonant coil in the case of parallel arrangement.
Development and Performance Compensation of the Extremely Stable Transceiver System for High Resolution Wideband Active Phased Array Synthetic Aperture Radar
Sung, Jin-Bong ; Kim, Se-Young ; Lee, Jong-Hwan ; Jeon, Byeong-Tae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 573~582
DOI : 10.5515/KJKIEES.2010.21.6.573
In this paper, X-band transceiver for high resolution wideband SAR systems is designed and fabricated. Also as a technique for enhancing the performance, error compensation algorithm is presented. The transceiver for SAR system is composed of transmitter, receiver, switch matrix and frequency generator. The receiver especially has 2 channel mono-pulse structure for ground moving target indication. The transceiver is able to provide the deramping signal for high resolution mode and select the receive bandwidth for receiving according to the operation mode. The transceiver had over 300 MHz bandwidth in X-band and 13.3 dBm output power which is appropriate to drive the T/R module. The receiver gain and noise figure was 39 dB and 3.96 dB respectively. The receive dynamic range was 30 dB and amplitude imbalance and phase imbalance of I/Q channel was
0.38 dBm and
3.47 degree respectively. The transceiver meets the required electrical performances through the individual tests. This paper shows the pulse error term depending on SAR performance was analyzed and range IRF was enhanced by applying the compensation technique.
Composite Right/Left Handed(CRLH) Transmission Line with Controllable Transmission Zeros
Lee, Ja-Hyeon ; Kim, Kyoung-Keun ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 583~590
DOI : 10.5515/KJKIEES.2010.21.6.583
In this paper, a novel CRLH-TL unit cell with controllable transmission zeros was proposed. Proposed composite right/left handed transmission line(CRLH-TL) unit cell is implemented in the form of the metal-insulator-metal(MIM) capacitors, the microstrip stub inductors, and the co-planar waveguide(CPW) inductor. And this proposed CRLH-TL generates two transmission zeros in lower/upper passband by the effort of electromagnetic couplings between each MIM capacitors and microstrip stub inductors. Using this proposed CRLH-TL, broad bandpass filter for UWB system was designed and fabricated. The measured results reveal that the two transmission zeros are observed in lower/upper passband and the overall size of the filter, excluding the feed line is about 8 mm
8 mm, less then
/4 on electric size.
Design and Fabrication of CMOS Low-Power Cross-Coupled Voltage Controlled Oscillators for a Short Range Radar
Kim, Rak-Young ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 591~600
DOI : 10.5515/KJKIEES.2010.21.6.591
In this paper, three kinds of 24 GHz low-power CMOS cross-coupled voltage controlled oscillators are designed and fabricated for a short-range radar applications using TSMC 0.13
CMOS process. The basic CMOS crosscoupled voltage controlled oscillator is designed for oscillating around a center frequency of 24.1 GHz and subthreshold oscillators are developed for low power operation from it. A double resonant circuit is newly applied to the subthreshold oscillator to improve the problem that parasitic capacitance of large transistors in a subthreshold oscillator can push the oscillation frequency toward lower frequencies. The fabricated chips show the phase noise of -101~-103.5 dBc/Hz at 1 MHz offset, the output power of -11.85~-15.33 dBm and the frequency tuning range of 475~852 MHz. In terms of power consumption, the basic oscillator consumes 5.6 mW, while the subthreshold oscillator does 3.3 mW. The subthreshold oscillator with the double resonant circuit shows relatively lower power consumption and improved phase noise performance while maintaining a comparable frequency tuning range. The subthreshold oscillator with double resonances has FOM of -185.2 dBc based on 1 mW DC power reference, which is an about 3 dB improved result compared with the basic oscillator.
Analysis for Measured Results in EMF Strength Exposure Level under Base Station Environment for Mobile Communication
Song, Hae-Zu ; Kim, Soon-Young ; Lee, Moon-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 601~609
DOI : 10.5515/KJKIEES.2010.21.6.601
This paper measured EMF strength of the duty measurement radio station(77 station) and the non-duty measurement radio station(41 station) of mobile communication base station in Jeonbuk region. As the result of measurement, it generally reveals that EMF is highly low level compare to the human protection guideline. And It is regarded as level that the national people who live close to the mobile communication base station don`t have to worry about electromagnetic wave. This paper provides comparative analyses categorized by the duty measurement station and the non-duty measurement station. The results reveals that the average value and the maximum value of the non-duty measurement station preferably was higher than all the duty measurement station. It is thought that the EMF exposure strength of the national people is caused by approach of station antenna rather than antenna power. Consequently this paper suggests that standard of the antenna power(exceed 30 W), standard of antenna height(exceed 10 m) specified by Radio Regulation Act enforcement ordinance, legal basis for mobile communication base station have to be changed.
Design of Frequency Selective Surface Based Artificial Magnetic Conductor Using the Particle Swarm Optimization
Hong, Ic-Pyo ; Lee, Kyung-Won ; Yook, Jong-Gwan ; Cho, Chang-Min ; Chun, Hueng-Jae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 610~616
DOI : 10.5515/KJKIEES.2010.21.6.610
In this paper, particle swarm optimization(PSO) is applied for the design of frequency selective surface based artificial magnetic conductor. An equivalent circuit model for this artificial magnetic conductor(AMC) with Jerusalem Cross arrays was derived and then PSO was applied for obtaining the optimized geometrical parameters with desired resonant frequency. The resonant frequency and the reflection phase characteristics from the optimization were compared to the results from commercial software for verifying the validity of this paper. The procedure presented in this paper can be applied to design the AMC with different frequency selective surface and also can be used for the design of microwave circuits like the AMC ground planes.
Improvement of Phase Noise Characteristics of Continuous Wave in the Sub-Millimeter Bands Generated by Photomixing Using Polarization and Phase Mismatch
Kim, Sung-Il ; Kang, Kwang-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 617~626
DOI : 10.5515/KJKIEES.2010.21.6.617
In this paper, we have proposed and experimentally performed a polarization and phase control method of an optical signal which has same wavelength with the optical carrier to improve phase characteristics of a continuous wave(CW) generated by the double sideband-suppressed carrier(DSB-SC) as one of the famous photomixing technique for making sub-millimeter and terahertz waves. A polarization and phase controlled optical signal has been coupled with the general DSB-SC on an optical coupler. The output of the optical coupler is then photomixed by a photomixer. From our analysis and measurement results, we have found that the amplitude of the generated sub-mm and terahertz CW signal is higher 1.5 dB and the phase noise is lower about 3 dB@10 kHz offset frequency than the general DSBSC. Consequently, since our proposed method has improved the amplitude and phase noise of CW signals in the sub-mm and terahertz bands, it can be helpful results to make low cost CW generator in sub-millimeter and subterahertz bands.
Low Phase Noise VCO Using Complimentary Bifilar Archimedean Spiral Resonator(CBASR)
Lee, Hun-Sung ; Yoon, Won-Sang ; Lee, Kyoung-Ju ; Han, Sang-Min ; Pyo, Seong-Min ; Kim, Young-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 627~634
DOI : 10.5515/KJKIEES.2010.21.6.627
In this paper, a novel voltage-controlled oscillator(VCO) using the complimentary bifilar archimedean spiral resonator(CBASR) is presented for reducing the phase noise characteristic. A CBASR has compact dimension, a sharp skirt characteristic in stopband, a low insertion loss in passband, and a large coupling coefficient value, which makes a high Q value and improve the phase noise of VCO. The proposed VCO has the oscillation frequency of 2.396~2.502 GHz in the tuning voltage of 0~5 V, the output power of 7.5 dBm and phase noise of -119.16~-120.2 dBc/㎐ at the offset frequency of 100 kHz in tuning range.
The Effects of Time Domain Windowing and Detection Ordering on Successive Interference Cancellation in OFDM Systems over Doubly Selective Channels
Lim, Dong-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 635~641
DOI : 10.5515/KJKIEES.2010.21.6.635
Time-varying channel characteristics in OFDM systems over doubly selective channels cause inter-carrier interferences(ICI) in the frequency domain. Time domain windowing gives rise to restriction on the bandwidth of the frequency domain channel matrix and makes it possible to approximate the OFDM system as a simplified linear input-output model. When successive interference cancellation based on linear MMSE estimation is employed for channel equalization in OFDM systems, symbol detection ordering produces considerable effects on overall system performances. In this paper, we show the reduction of the residual ICI by time domain windowing and the resultant performance improvements, and investigate the effects of SINR- and CSEP-based symbol detection ordering on the performance of successive interference cancellation.
TT&C Antenna Design for LEO Satellite
Lee, Kwang-Jae ; Woo, Duk-Jae ; Lee, Taek-Kyung ; Lee, Jae-Wook ; Lee, Woo-Kyung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 642~650
DOI : 10.5515/KJKIEES.2010.21.6.642
In this paper, we study a TT&C link to obtain a required specifications of TT&C(Telemetry Tracking and Command system) antenna for an LEO(Low Earth Orbit) satellite. The premised mission orbit is the sun-synchronized and circular orbit and it performs earth-space observations. We design minimum TT&C link-budget to obtain required antenna beamwidth and gain. The proposed turnstile antenna provides wide beamwidth and circular polarization. We suggested the attaching position that shows the most effective results by confirming the variation of antenna performance when the proposed antenna is adapted to satellite`s various positions. Also we proved the proposed antenna`s ability while it is performing the mission through the orbit simulation based on the electrical performance of the proposed turnstile antenna.
Dual-Band Six-Port Direct Conversion Receiver with I/Q Mismatch Calibration Scheme for Software Defined Radio
Moon, Seong-Mo ; Park, Dong-Hoon ; Yu, Jong-Won ; Lee, Moon-Que ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 651~659
DOI : 10.5515/KJKIEES.2010.21.6.651
In this paper, a new six-port direct conversion receiver for high-speed multi-band multi-mode wireless communication system such as software defined radio(SDR) is proposed. The designed receiver is composed of two CMOS four-port BPSK receivers and a dual-band one-stage polyphase filter for quadrature LO signal generation. The four-port BPSK receiver, implemented in 0.18
CMOS technology for the first time in microwave-band, is composed of two active combiners, an active balun, two power detector, and an analog decoder. The proposed polyphase filter adopt type-I architecture, one-stage for reduction of the local oscillator power loss, and LC resonance structure instead of using capacitor for dual-band operation. In order to extent the operation RF bandwidth of the proposed six-port receiver, we include I/Q phase and amplitude calibration scheme in the six-port junction and the power detector. The calibration range of the phase and amplitude mismatch in the proposed calibration scheme is 8 degree and 14 dB, respectively. The validity of the designed six-port receiver is successfully demonstrated by modulating M-QAM, and M-PSK signal with 40 Msps in the two-band of 900 MHz and 2.4 GHz.
Multiple Antenna System for Next Generation Mobile Communication
Han, Min-Seok ; Choi, Jae-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 660~669
DOI : 10.5515/KJKIEES.2010.21.6.660
In this paper, a multiple antenna system for next generation mobile applications is proposed. The proposed MIMO antenna consists of two parallel folded monopole antennas with the length of 100 mm and spacing of 6 mm and a decoupling network which locates at the top side of a mobile handset. In order to improve the isolation characteristic at the LTE band 13, a decoupling network was added between the two antenna elements placed close to each other. The decoupling network, consisting of two transmission lines, a shunt reactive component and common ground line, is simple and compact. To obtain the wide bandwidth characteristic, an wide folded patch structure generating the strong coupling between feeding and shorting lines through the slit is used at the bottom side of a mobile handset. Also, the performance of a multiple antenna system composed of three antenna elements is analyzed.
60 GHz CMOS SoC for Millimeter Wave WPAN Applications
Lee, Jae-Jin ; Jung, Dong-Yun ; Oh, Inn-Yeal ; Park, Chul-Soon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 670~680
DOI : 10.5515/KJKIEES.2010.21.6.670
A low power single-chip CMOS receiver for 60 GHz mobile application are proposed in this paper. The single-chip receiver consists of a 4-stage current re-use LNA with under 4 dB NF, Cgs compensating resistive mixer with -9.4 dB conversion gain, Ka-band low phase noise VCO with -113 dBc/Hz phase noise at 1 MHz offset from 26.89 GHz, high-suppression frequency doubler with -0.45 dB conversion gain, and 2-stage current re-use drive amplifier. The size of the fabricated receiver using a standard 0.13
CMOS technology is 2.67 mm
0.75 mm including probing pads. An RF bandwidth is 6.2 GHz, from 55 to 61.2 GHz and an LO tuning range is 7.14 GHz, from 48.45 GHz to 55.59 GHz. The If bandwidth is 5.25 GHz(4.75~10 GHz) The conversion gain and input P1 dB are -9.5 dB and -12.5 dBm, respectively, at RF frequency of 59 GHz. The proposed single-chip receiver describes very good noise performances and linearity with very low DC power consumption of only 21.9 mW.
Analysis and Design of High Efficiency Feedforward Amplifier Using Distributed Element Negative Group Delay Circuit
Choi, Heung-Jae ; Kim, Young-Gyu ; Shim, Sung-Un ; Jeong, Yong-Chae ; Kim, Chul-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 681~689
DOI : 10.5515/KJKIEES.2010.21.6.681
We will demonstrate a novel topology for the feedforward amplifier. This amplifier does not use a delay element thus providing an efficiency enhancement and a size reduction by employing a distributed element negative group delay circuit. The insertion loss of the delay element in the conventional feedforward amplifier seriously degrades the efficiency. Usually, a high power co-axial cable or a delay line filter is utilized for a low loss, but the insertion loss, cost and size of the delay element still acts as a bottleneck. The proposed negative group delay circuit removes the necessity of the delay element required for a broadband signal suppression loop. With the fabricated 2-stage distributed element negative group delay circuit with -9 ns of total group delay, a 0.2 dB of insertion loss, and a 30 MHz of bandwidth for a wideband code division multiple access downlink band, the feedforward amplifier with the proposed topology experimentally achieved a 19.4 % power added efficiency and a -53.2 dBc adjacent channel leakage ratio with a 44 dBm average output power.
Study on Nulling Antenna Using Genetic Algorithm with Opposite-Sign Phase
Lee, Yong-Jun ; Seo, Jong-Woo ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 690~697
DOI : 10.5515/KJKIEES.2010.21.6.690
In this paper we propose an opposite-sign phase method to implement a nulling antenna using genetic algorithm. In the opposite-sign phase method the phase value of each antenna element in the linear phased array antenna is symmetrical to the center of the array and the sign of the phases of the neighboring elements is alternating. Compared to the conventional genetic algorithm our genetic algorithm shows the capability of synthesizing nulls faster and sharper.
Active Shark Antenna for the Vehicle AM/FM/TDMB/GPS Receiver
Kim, Joo-Man ; Son, Tae-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 698~705
DOI : 10.5515/KJKIEES.2010.21.6.698
A vehicle antenna for AM, FM, TDMB, GPS systems was designed and implemented. Omnidirectional AM antenna was designed by ferrite turn style antenna. For the FM and TDMB antenna, folded monopole antenna which helical is folded was applied. GPS antenna for the bandwidth achievement was designed by trapezoidal microstrip patch that has air substrate. Receiving signal strengths by the measurement were presented for the AM, FM and TDMB antenna. AM signal strength was -65.7 dBm, this strength is almost as same conventional pole antenna as -63.4 dBm. It can be replaced conventional pole or glass antenna by the studied antenna. Signal strengths for FM and TDMB were -55.66 and -43.50 dBm at center frequency, they are 5~10 dB higher than conventional antenna. Measurements of bandwidth and gain for the GPS antenna showed 135 MHz under VSWR 2 : 1 and 4.31 dBi, gains over GPS band were 3~5 dB higher than ceramic patch antenna.
A Study on the Small Loop Antenna with a Parasitic Loop Structure for Multiband Mobile Phone Application
Lee, Sang-Heun ; Kim, Ki-Joon ; Jung, Jong-Ho ; Yoon, Young-Joong ; Kim, Byoung-Nam ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 6, 2010, Pages 706~713
DOI : 10.5515/KJKIEES.2010.21.6.706
In this paper, the small loop antenna with a parasitic loop structure for penta-band mobile phone application is proposed. This antenna is composed of a feed monopole, a radiating loop antenna with a parasitic loop structure and an additional radiating element. The antenna is printed on the very thin flexible substrate to mount on the dielectric carrier with a volume of 40 mm
3 mm. The bandwidth of the proposed antenna is 402 MHz(773~1,175 MHz) for low band and 583 MHz(1,622~2,205 MHz) for high band. As a result, the proposed antenna covers the five bands of GSM850, GSM900, DCS1800, PCS1,900 and WCDMA for a 3:1 VSWR. Moreover, the radiation pattern, gain and efficiency are appropriate for mobile handset. Therefore, this antenna is suitable for small sized multi-band mobile handset applications.