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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 Temperature Compensation Circuit to Compensate Temperature Characteristics of VCO
Kim, Byung-Chul ; Huang, Gui-Hua ; Cho, Kyung-Rae ; Lee, Jae-Buom ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 223~228
DOI : 10.5515/KJKIEES.2010.21.3.223
In this paper, temperature compensation circuit for the X-band voltage controlled oscillator(VCO) is presented by using the temperature sensor with the OP-AMP circuit. The frequency drifting by the temperature could be compensated by applying the tuning voltage which include the linearly changing output voltage of the temperature sensor. As a result, the frequency variation is reduced to 6.6~4.4 MHzfrom the 71~73 MHz variation with the compensation circuit over -30~+
range, when VCO is operated in the frequency range of 9.95~10.05 GHz.
Subcarrier Allocation Algorithm with Simple CSI for Multiuser OFDM System
Yang, Jun-Seok ; Park, Sang-Kyu ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 229~235
DOI : 10.5515/KJKIEES.2010.21.3.229
The Orthogonal Frequency Division Multiplexing(OFDM) has been strongly recommended as a transmission technique in order to satisfy requests of high speed and high quality multimedia information. This paper considers resource allocation algorithm which supports the user Quality of Service(QoS) for multi-user OFDM system with simple CSI (Channel State Information) structure. After users eligible for services and the number of subcarrier are determined by minimum request data rate and average channel gain, subcarriers are allocated to increase total transmission rates. Although ideal CSI is not reported to base station, compared to conventional algorithm, we have obtained better result with simple CSI structure.
A Planar Implementation of a Negative Group Delay Circuit
Jeong, Yong-Chae ; Choi, Heung-Jae ; Chaudhary, Girdhari ; Kim, Chul-Dong ; Lim, Jong-Sik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 236~244
DOI : 10.5515/KJKIEES.2010.21.3.236
In this paper, a planar structure negative group delay circuit(NGDC) is proposed to overcome the limited availability of the component values required for the prototype lumped element(LE) NGDC design. From the prototype LE circuit analysis, general design equations and the conditions to obtain the NGD are derived and illustrated. Then the LE circuit is converted into the planar structure by applying the transmission line resonator(TLR) theory. As a design example, the LE NGDC and the proposed planar structure NGDC are designed and compared. To estimate the commercial applicability, 2-stage reflection type planar NGDC with -5.6 ns of total group delay, -0.2 dB of insertion loss, and 30 MHz of bandwidth together with 0.1 dB and 0.5 ns of the magnitude and group delay flatness, respectively, for Wideband Code Division Multiple Access(WCDMA) downlink band is fabricated and demonstrated. Also, to show the applicability of the proposed NGDC, we have configured a simple signal cancellation loop and obtained good loop suppression performance.
A Filter Synthesis Method without Bandwidth Reduction for Dual-Band Filters Based on Coupled Lines
Lee, Seung-Ku ; Ha, Jung-Je ; Lee, Yong-Shik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 245~252
DOI : 10.5515/KJKIEES.2010.21.3.245
This paper proposes an improved filter synthesis method for dual-band filters based on coupled lines loaded with shunt stubs. The conventional design method relies on equality of the response of the conventional single-band filter and its dual-band counterpart at two frequencies. On the other hand, the proposed method is based on equivalence of the propagation constants and the image impedances of the two filters. Therefore, the proposed method does not suffer from bandwidth reduction phenomena, which requires complex compensating process in the conventional method. Also, the alternative design parameters provided by the demonstrated method enable to construct dual-band filters with more flexibility. For experimental verification, a Chebyshev type dual-band filter with center frequencies at 1 GHz and 3.5 GHz is designed and fabricated. The measured results are in excellent agreement with the full-wave simulated results.
Dual-Band Filter Using Heterogeneous Resonators
Kim, Kyoung-Keun ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 253~261
DOI : 10.5515/KJKIEES.2010.21.3.253
In this paper, the design and the fabrication of dual bandpass filter using heterogeneous resonators is presented. Each resonator would not have an effect on each resonant frequency. Two types of resonators are designed to have different fundamental resonant frequencies, one for the lower passband and the other for the upper passband. In the lower band, half and quarter wavelength resonators were used. In the upper band, a dual-mode resonator was used for adjusting bandwidth. In the upper pass band frequency, resonators of lower passband acts as the input and output. For WLAN, Proposed filters with different second passband frequencies at 2.45/5.2 GHz and 2.45/5.8 GHz are designed and fabricated.
An Active Tunable Bandpass Filter Design for High Power Application
Kim, Do-Kwan ; Yun, Sang-Won ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 262~268
DOI : 10.5515/KJKIEES.2010.21.3.262
In this paper, a high power active tunable bandpass filter made of dielectric resonators and varactor diodes is designed using the active capacitance circuit generating negative resistance for tuning cellular TX, RX band. An active capacitance circuit`s series feedback circuit using GaAs HFET whose
is 32 dBm is used for compensating the losses from the varactor diodes of the tunable bandpass filter. The tuning elements, the varactor diodes are used as the back-to-back configuration to achieve the high power performance, The designed active capacitance circuit improves the insertion loss characteristics. The designed 2-stage active tunable dielectric bandpass filter at cellular band can cover from 800 MHz to 900 MHz. The insertion losses at 836 MHz and 881.5 MHz with 25 MHz bandwidth are 0.48 dB and 0.39 dB, respectively. The
of the designed bandpass filter at TX and RX band are measured as 19.5 dBm and 23 dBm, respectively.
Design of a 0.5~2 GHz Cavity-Backed Spiral Antenna
Jeon, Nam-Du ; Shin, Dong-Hoon ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 269~277
DOI : 10.5515/KJKIEES.2010.21.3.269
In this paper, the design of a 0.5~2 GHz cavity-backed spiral antenna is described. Combined arm pattern with a log spiral in the inner region and an Archimedean spiral in the outer region, a backing cavity, and a Marchand coaxial balun for feeding are designed. Termination resistors are used to improve antenna characteristics at the lower frequency of the operation frequency. VSWR, axial ratio, gain and HPBW(Half Power Beam Width) characteristics are simulated using CST`s MWS. Finally, the validity of these approaches is verified by comparing the simulated results with the measured ones. Also, the measurement results are compared with the performance of a commercial spiral antenna.
Design of W-Band Diode Detector
Choi, Ji-Hoon ; Cho, Young-Ho ; Yun, Sang-Won ; Rhee, Jin-Koo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 278~284
DOI : 10.5515/KJKIEES.2010.21.3.278
In this paper, a millimeter-wave detector using zero-bias schottky diode is designed and fabricated at W-band. It consists of LNA(Low Noise Amplifier) and detector module to improve sensitivity. LNA case with a highly stop-band characteristic is designed to prevent the oscillation by LNA MMIC chip. Diode detector of planar structure is fabricated for the easy connection with LNA module and zero bias Schottky diode is utilized. In practice, the fabricated diode detector have shown the detection voltage of 20~500 mV to the RF input power of -45~-20 dBm. The proposed W-band detector can be applicable to the passive millimeter image system.
Indoor Wireless Optical Communication Using a Lighting LED and a Solar Cell
Lee, Seong-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 285~291
DOI : 10.5515/KJKIEES.2010.21.3.285
In this paper, we demonstrate that indoor wireless optical communication is possible with an LED and a solar cell. A lighting LED is used for lighting and signal transmission. A solar cell is used for collecting light energy and signal detection. This scheme is very useful because transmission is possible without any additional communication systems. In experiments, wireless optical communication was carried out at a data rate of 9.6 kbps using a lighting LED and a solar cell.
Design and Fabrication of a Multi-Function Circuit to Implement Hybrid-Conversion RF Front-End for Broadband and Multiband System
Go, Min-Ho ; Ju, Young-Rim ; Jo, Yun-Hyun ; Park, Hyo-Dal ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 292~300
DOI : 10.5515/KJKIEES.2010.21.3.292
In this paper, we propose a RF front-end architecture based on hybrid conversion which is available to receive both broadband and multiband DVB-H receiver, and a multi-function circuit for implementing the RF front-end is fabricated. A multi-function circuit is operated as a sub-harmonic mixer mode in the case of receiving a broadband VHF/UHF band, which show a conversion loss of -10.0 dB, noise figure of 7.0 dB and IIP3 of 2.0 dBm. On the other hand, it is performed as a attenuation mode with a insertion loss of -10.0 dB in receiving a multiband, L-band.
Source Independent Subtree Ray Tracing Method for Wave Propagation Simulation in Urban Environment
Kwon, Se-Woong ; Moon, Hyun-Wook ; Oh, Jae-Rim ; Yoon, Young-Joong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 301~306
DOI : 10.5515/KJKIEES.2010.21.3.301
In this paper, a SIT(Source Independent Tree) method for ray tracing is proposed to enhance the efficiency of tree construction with reuse of sub tree in urban environment, As the SIT method is applied, the decrease of the number of nodes for picocell and microcell simulations is 100 times. And 88~98 % of the total nodes are reused with change of location of signal source from an analysis of node reuse efficiency. Therefore the proposed SIT method is useful in performance enhancement of ray tracing, especially, for multiple antenna simulation like as MIMO system and cell planning.
Suspended Stripline Filter Design Using a New Ultra-Wideband Microstrip-to-Suspended Stripline Transition
Kim, Young-Gon ; Song, Sun-Young ; Kim, In-Bok ; Kim, Kang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 307~314
DOI : 10.5515/KJKIEES.2010.21.3.307
In this paper, a novel ultra-wideband microstrip-to-suspended stripline(SSL) transition is proposed, and SSL filters with low-loss and high selectivity have been realized using this transition. Since the proposed transition has low-loss and wide bandwidth characteristic, the design procedure of SSL filters become simplified. Additionally, the designed filters do not require extra time-consuming tuning. As design examples, SSL low-pass and high-pass filters have been implemented, and a implemented bandpass filter with connection of the low and high-pass filters performs 2.3~10.5 GHz bandwidth with less than 1.2 dB insertion loss and high selectivity.
Design and Implementation of an Internal Mobile Phone Antenna for TDMB System
Lee, Jeong-Ho ; Song, Jae-Kwan ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 315~320
DOI : 10.5515/KJKIEES.2010.21.3.315
In this paper, an internal TDMB(Terrestrial Digital Multimedia Broadcasting) antenna for mobile phone is proposed. The overall dimension of designed antenna with substrate is 30 mm
0.6 mm. The proposed antenna consists of a meander type radiator which is connected front- and back-plane of Kapton substrate by via hole and parasitic element for tuning the resonant frequency. And to compensate the electric length of desired frequency, passive inductor is used for matching element. Measured gain of the implemented antenna -17.6 dBi at 174 MHz, -13.01 dBi at 195 MHz, and -14.9 dBi at 216 MHz.
Design and Fabrication of Compressive Receiver for RFID Signal Detection
Jo, Won-Sang ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 21, issue 3, 2010, Pages 321~330
DOI : 10.5515/KJKIEES.2010.21.3.321
In this paper, the theoretical background and the specific implementation method of a compressive receiver for RFID signal detection as well as the design method of DDL(Dispersive Delay Line) and chirp LO are described. DDL, which is one of the main components of the compressive receiver, is designed to have
dispersive delay time and 6 MHz bandwidth using the SAW technique based on
material. The chirp LO is designed using DDS(Direct Digital Synthesizer). Also the compressive receiver is fabricated to be installed into the RFID reader. Test results show the maximum frequency error of 25 kHz for single signal input, the receiver sensitivity of -44 dBm, and the maximum frequency error is 75 kHz for 6 multi-tone input signals. These results indicate that the fabricated compressive receiver is working well even in dense RFID operating environments.