Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Journal of Korean Institute of Electromagnetic Engineering and Science
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
Editor in Chief :
Volume & Issues
Volume 19, Issue 12 - Dec 2008
Volume 19, Issue 11 - Nov 2008
Volume 19, Issue 10 - Oct 2008
Volume 19, Issue 9 - Sep 2008
Volume 19, Issue 8 - Aug 2008
Volume 19, Issue 7 - Jul 2008
Volume 19, Issue 6 - Jun 2008
Volume 19, Issue 5 - May 2008
Volume 19, Issue 4 - Apr 2008
Volume 19, Issue 3 - Mar 2008
Volume 19, Issue 2 - Feb 2008
Volume 19, Issue 1 - Jan 2008
Selecting the target year
Rectangular Waveguide-NRD Waveguide Transition having the NRD Waveguide Built-in Structure
Yoo, Young-Geun ; Choi, Jae-Ha ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 391~396
DOI : 10.5515/KJKIEES.2008.19.4.391
In this paper, we proposed the new rectangular waveguide-NRD waveguide transition in which the transition function about the standard waveguide is built in within the NRD waveguide ifself. The newly proposed rectangular waveguide-NRD waveguide transition was realized use of NRD waveguide input/output side wall thickness and hole width. In the case of the wall thickness, it was nearly identical with the half of the NRD waveguide guide wavelength and the width of an hole was nearly coincide with the length of the long side of the standard waveguide connected with the NRD waveguide. This kind of the principles is applicable to be unrelated with the frequency band. In this paper, it made in 38 GHz band with the rectangular waveguide-NRD waveguide transition and the feasibility was confirmed. In the back-to-back structure, the rectangular waveguide-NRD waveguide transition manufactured in 38 GHz band has the insertion loss less than 0.4 dB and also has the return loss less than 20 dB.
60 GHz Band Non-Radiative Dielectric Waveguide Mixer having the Waveguide Directional Coupler
Yoo, Young-Geun ; Choi, Jae-Ha ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 397~403
DOI : 10.5515/KJKIEES.2008.19.4.397
In this paper, the mixer was implemented in the non-radiative dielectric waveguide that is the main component of 60 GHz band radio telecommunications equipment which a demand increases for the purpose of point-to-point communication network. As to the manufacture of the non-radiative dielectric waveguide mixer, it was the implementation of the dielectric line combiner to be most difficult. The thing which that gives shape to the curvature which is the dielectric line determined and the to place in the exact interval thing are easy. For this reason, it was very difficult to make in order to have the regular performance in the case of the mixer having the dielectric line combiner. In this paper, since the dielectric line combiner was replaced with the waveguide directional coupler and the manufacture was possible through a processing it had the characteristic that a combiner is fixed. In result, the productivity of a mixer was innovatively improved. The design frequency of the mixer implemented through this paper RF and LO are
. IF Is
. The down conversion loss toward the RF input of
was measured by
in the condition that LO is 10 dBm, 60 GHz.
Bandwidth Improvement of Circularly Polarized Microstrip Antenna for an UHF RFID Portable Reader
Kim, Sang-Gi ; Choi, Ik-Guen ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 404~410
DOI : 10.5515/KJKIEES.2008.19.4.404
In this paper, circular polarized microstrip antenna with a conducted hollow cylinder-typed via around the coaxial probe is proposed to enhance the bandwidth of an RFID portable reader microstrip antenna. An antenna of thickness of 6.4 mm and size of
is manufactured with FR4 substrate and its 10 dB return loss bandwidth is measured to be 92 MHz, which is about three times large than the same size's microstrip antenna without hollow cylindrical via. The measured antenna gain and the axial ratio at each are
within 10 dB return loss bandwidth, respectively.
Miniaturization of Circularly Polarized Microstrip Antenna for RFID Portable Reader at 900 MHz Band
Kang, Min-Sik ; Choi, Ik-Guen ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 411~417
DOI : 10.5515/KJKIEES.2008.19.4.411
This paper presents the miniaturization of circularly polarized microstrip patch antenna for UHF-band RFID portable reader. The proposed antenna has a group of four I-slots on a conventional corner-truncated square microstrip patch and it is shown that the antenna size is reduced compared to the antenna without I-slots. A 76 mm by 76 mm small antenna with four I-slots is fabricated with 6.4 mm thick FR4 substrate and its 10 dB return loss bandwidth, the gain and the axial ratio are measured to be
within the 10 dB return loss bandwidth, respectively.
Impedance Analysis of DGS Slot in Spectral Domain and Its Application of LPF(Low Pass Filter)
Rhee, Seung-Yeop ; Kim, On ; Chang, Jae-Soo ; Go, Jin-Hyun ; Ha, Jae-Kwon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 418~426
DOI : 10.5515/KJKIEES.2008.19.4.418
In this paper, investigations on the impedance characteristics of a DGS(Defected Ground Structure) slot in the groud plane of microstripline are presented in spectral domain and applied to the characteristic improvement of stepped impedance microstrip low pass filter(LPF). In this method, expressions for the impedance of a DGS slot are derived from self-reaction of the angular spectrum of plane waves and the discontinuity in the modal voltage. The numerical results are compared with those of the rigorous full-wave method and are shown to produce reasonably accurate data. And the stepped impedance microstrip low pass filter is designed and fabricated with the uniform and nonuniform DGS slots for improving the frequency responses. The experiments show that the proposed filter with slots in the ground plane has a wider stopband and sharper cutoff response.
A Stable MOT Scheme with Combined Field Integral Equation for the Analysis of Transient Scattering from Conducting Structure
Lee, Chang-Hwa ; An, Ok-Kyu ; Kwon, Woo-Hyen ; Jung, Baek-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 427~435
DOI : 10.5515/KJKIEES.2008.19.4.427
In this paper, a stable marching-on in time(MOT) method with a time domain combined field integral equation(CFIE) is presented to obtain the transient scattering response from arbitrarily shaped three-dimensional conducting bodies. This formulation is based on a linear combination of the time domain electric field integral equation(EFIE) with the magnetic field integral equation(MFIE). The time derivatives in the EFIE and MFIE are approximated using a central finite difference scheme and other terms are averaged over time. This time domain CFIE approach produces results that are accurate and stable when solving for transient scattering responses from conducting objects. Numerical results with the proposed MOT scheme are presented and compared with those obtained from the conventional method and the inverse discrete Fourier transform(IDFT) of the frequency domain CFIE solution.
An Analysis of Three Port Ring Resonator for the Balun-BPF Characteristics
Kang, Seong-Jun ; Park, Ung-Hee ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 436~441
DOI : 10.5515/KJKIEES.2008.19.4.436
In this paper, we derived the Y-parameter of the recently reported Balun-BPF with a dual mode ring resonator by using the network analysis method. Using the derived Y-parameter we verified that the Balun-BPF structure satisfy the balun conditions. In order to design the Balun-BPF with arbitrary characteristics using the standard BPF design method with ease we derived the immittance slope parameters of the dual mode ring resonator with a load. The notch frequencies are also predicted. By designing with the proposed equations, simulating with a circuit simulator, fabricated and measured a Balun-BPF we confirmed the validation of the equations. The measured data shows bandwidth of 71 MHz and insertion loss of 0.92 dB at the center frequency of 2.46 GHz. It shows the phase imbalance of
degree and the magnitude imbalance within 0.5 dB.
A Study on the Phase Diversity and Optimal I/Q Signal Combining Methods on a UHF RFID Receiver
Jang, Byung-Jun ; Song, Ho-Jun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 442~450
DOI : 10.5515/KJKIEES.2008.19.4.442
In this paper, the phase diverisity in a direct-conversion receiver for a UHF RFID reader is analyzed and the optimal I/Q signal combining methods is presented with respect to tag modulation. At first, fading characteristics of a single channel receiver is shown to prove the importance of phase diversity due to the phase relationship between the backscattered signal and the local oscillator. And the optimal signal combining methods are presented in order to overcome the signal power reduction due to phase diversity. In case of ASK, the power combining method is presented for the optimal I/Q combining. And the arctangent and principal component combining methods using covariance matrix of I and Q channels are presented for the optimal I/Q combining in case of PSK. In order to analyze the performance of suggested methods, the selection diversity and the optimal combining methods are compared. According to analysis and simulation results, the optimal combining methods have a maximum 3 dB SNR enhancement than selection diversity.
Design of Offset Dual-Shaped Reflector Systems for Compact Antenna Test Range
Noh, Sung-Min ; Choi, Hak-Keun ; Lim, Sung-Bin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 451~460
DOI : 10.5515/KJKIEES.2008.19.4.451
Gregorian offset dual-shaped reflector antennas have been widely used in the satellite communication systems for their high gain and low sidelobe characteristics. However, in this paper, it is designed as the CATR(Compact Antenna Test Range) reflector system, and its near-field characteristics are investigated. The CATR facility needs to provide an uniform plane wave with the minimum amplitude and phase ripple and the low cross polarization to the test region. Therefore, the reflector near-field patterns are calculated and presented with the variations of the aperture power distribution, the feed horn pattern, and the distance from the aperture to the test zone. Also, the offset dual-shaped reflector is fabricated at 30 GHz, and its near-field patterns are measured. The measured results are in good agreement with the calculated results. From theses results, we confirm that the designed offset dual-shaped reflector can be used as the reflector system for the compact antenna test range.
Hybrid Symbol Offset Estimation Algorithm for MIMO OFDM Systems
Jung, Hyeok-Koo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 461~469
DOI : 10.5515/KJKIEES.2008.19.4.461
This paper proposes a hybrid symbol offset estimation algorithm for MIMO(Multiple Input Multiple Output) OFDM system. As MIMO OFDM systems are multiple transmitter and receiver antenna systems, apart from SISO(Single Input Single Output) system, it is possible to use several combining techniques which are used in multiple receive antenna system. In this paper, we propose hybrid symbol offset estimation algorithms using combining techniques in multiple receive antenna systems, simulate and show the performances in MIMO system environments. The proposed equal gain combining correlation algorithm has better performance 1.8 times in searching the ideal symbol offset rather than the conventional early symbol offset algorithm in severe ISI channel.
A Study on Improvement of QoS through Analyzing Transmission Characteristics of TDMA Noise in the GSM Mobile Set
Ha, Jeung-Uk ; Oh, Tae-Hoon ; Kang, Jin-Seok ; Yoon, Young-Joong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 470~476
DOI : 10.5515/KJKIEES.2008.19.4.470
In this paper, we describe the cause of TDMA noise and distinction method of TDMA noise source in a GSM mobile phone. The causes of TDMA noise are composed of RF(Radio Frequency) energy coupling and low frequency energy coupling by burst ripple. We propose the distinction method of TDMA noise source from output(TDMA noise measurement) and frequency response of a system(audio path). Especially we propose a method of insertion loss(
) analysis and the improvement method for RF energy coupling. Capacitor(40 pF) is a solution to reduce RF energy coupling and therefore TDMA noise was reduced by 10 dB.
A Design of Multi-Band Chip Antenna for Mobile Handsets
Cho, In-Ho ; Jung, Jin-Woo ; Lee, Cheon-Hee ; Lee, Yong-Hee ; Lee, Hyeon-Jin ; Lim, Yeong-Seog ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 477~483
DOI : 10.5515/KJKIEES.2008.19.4.477
The paper introduces mobile handset multi-band chip antenna to be used on meander line PIFA structure and parasite patch. The proposed antenna uses an FR-4 substrate. The top layer is consist of meander lines PIFA structure to implement GSM900 and is connected with each rad and meander line on the via-hole for maximize space efficiency. The middle layer is designed with the signal line and gap to implement a DCS and PCS bands, the bottom layer which is added to a parasite patch on the ground can be show an adjust of frequency and impedance character by the connection of the radiators of middle layer and coupling. The fabricated antenna with the dimension of
. The ground plane a dimension of
, designed by a commercial software CST simulator. The experimental results show that the bandwidth for(VSWR<3) is 90(
) MHz in GSM900 band operation and 380(
) MHz in DCS, PCS band operation. The maximum gains of antenna are 0.25 dBi, 3.65 dBi and 3.3 dBi at resonance frequencies and it has omni-directional pattern practically.
Design of L-Band High Speed Pulsed High Power Amplifier Using LDMOS FET
Yi, Hui-Min ; Hong, Sung-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 19, issue 4, 2008, Pages 484~491
DOI : 10.5515/KJKIEES.2008.19.4.484
In this paper, we design and fabricate the L-band high speed pulsed HPA using LDMOS FET. And we propose the high voltage and high speed switching circuit for LDMOS FET. The pulsed HPA using LDMOS FET is simpler than using GaAs FET because it has a high gain, high output power and sin81e voltage supply. LDMOS FET is suitable for pulsed HPA using switching method because it has
times higher maximum drain-source voltage(65 V) than operating drain-source voltage(
). As results of test, the output peak power is 100 W at 1.2 GHz, the rise/fall time of output RF pulse are 28.1 ns/26.6 ns at 2 us pulse width with 40 kHz PRF, respectively.