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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of electromagnetic engineering and science
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
Editor in Chief :
Volume & Issues
Volume 7, Issue 4 - Dec 2007
Volume 7, Issue 3 - Sep 2007
Volume 7, Issue 2 - Jun 2007
Volume 7, Issue 1 - Mar 2007
Selecting the target year
A Low-Power 2.4 GHz CMOS RF Front-End with Temperature Compensation
Kwon, Yong-Il ; Jung, Sang-Woon ; Lee, Hai-Young ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 103~108
DOI : 10.5515/JKIEES.2007.7.3.103
In this paper, a low-power 2.4 GHz front-end for sensor network application (IEEE 802.15.4 LR-WPAN) is designed in a 0.18 um CMOS process. A power supply circuit with a novel temperature-compensation scheme is presented. The simulation and measurement results show that the front-end (LNA, Mixer) can achieve a voltage gain of 35.3 dB and a noise figure(NF) of 3.1 dB while consuming 5.04 mW (LNA: 2.16 mW, Mixer: 2.88 mW) of power at
. The NF includes the loss of BALUN and BPF. The low-IF architecture is used. The voltage gain, noise figure and third-order intercept point (IIP3) variations over -45
are less than 0.2 dB, 0.25 dB and 1.5 dB, respectively.
Evaluation on MRC Diversity Reception of M-ary PSK and DPSK Signals on Wireless Fading Channels
Kim, Chung-Sock ; Kim, Chang-Hwan ; Jin, Yong-Ok ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 109~115
DOI : 10.5515/JKIEES.2007.7.3.109
The performances of M-ary PSK(MPSK) systems using L-branch maximum ratio combining(MRC) diversity reception in frequency-nonselective slow Rician fading channels are derived theoretically. Especially we investigate the effect of number of symbols on the difference between the approximation to bit error probability and the exact bit error rate(BER) in evaluating the performance of MPSK signals through numerical analyses. On the other hand, when M-ary DPSK(MDPSK) signals experience the Rician fading channels, the general formula for evaluating BER of MDPSK signals in the independent branch diversity system is presented using the integral-form expressions.
Novel Design of A Wideband Folded Monopole Antenna with Parasitic Element for DVB-H Application
Jeon, Seung-Gil ; Ryu, Kwang-Woo ; Choi, Jae-Hoon ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 116~121
DOI : 10.5515/JKIEES.2007.7.3.116
Novel design of a wideband monopole antenna for DVB-H service is presented. The proposed antenna is designed based on a monopole antenna. It consists of folded monopole and parallel parasitic element. The folded segment of the folded monopole makes the antenna shorter. The length of the parasitic element obtains additional resonance frequencies. The gap distance between the folded monopole and the parasitic element is a key parameter to control impedance matching for wideband operation. The antenna has wide band performance, good impedance and radiation characteristics from 470 MHz to 870 MHz. The measured return loss for operating frequencies over DVB-H band is better than 10 dB. Good radiation patterns are also obtained. The measured results are compared with calculated results using Ansoft HFSS(High Frequency Structure Simulator).
A Side-Fed Circularly-Polarized Patch Antenna with a Dielectric Loading
Jeong, Ji-Young ; Choi, Seung-Mo ; Enkhbayar, Bayanmunkh ; Sodnomtseren, Ononchimeg ; Ahn, Bierng-Chearl ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 122~128
DOI : 10.5515/JKIEES.2007.7.3.122
In this paper, we present the design and measurement of a side-fed circularly-polarized patch antenna with a dielectric loading. The antenna consists of a comer-truncated rectangular patch, an L-shaped ground plane, a dielectric loading material, and a coaxial probe. An antenna operating at the UHF band (910 MHz) for the RFID reader applications is optimized using a commercial software. The size of the patch is reduced by a factor of 1.73 by loading the patch with mono-cast(MC) nylon. Measurements of the fabricated antenna show performance characteristics comparable to those of much larger commercial RFID reader antennas.
The Design of a Dielectric Rod Antenna Using Genetic Algorithm Optimization for Vessel's Collision Avoidance Applications
Kahng, Sung-Tek ; Ju, Jeong-Ho ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 129~133
DOI : 10.5515/JKIEES.2007.7.3.129
In this paper, we present the development of an antenna specialized for the maritime collision avoidance system. This antenna is configured as the dielectric rod partially embedded in the metal cavity to reduce the overall size, simultaneously assuring the mechanical sturdiness against the challenging oceanic weather conditions. More importantly, the design has been carefully done to meet the requirements on the radiation pattern(with the slope < 5 dB/deg in the elevation(E-plane), circular in the azimuth) suitable to receiving the reflected signals from the other objects on the sea. To find the optimal design parameters, the genetic algorithm has been used to meet the goals of the desired return loss and pattern. This design methodology is validated by the good agreement between the calculation and measurement.
The Compact UHF CT-Type BandPass Filter with a Mixed Coupling
Ju, Jeong-Ho ; Kahng, Sung-Tek ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 134~137
DOI : 10.5515/JKIEES.2007.7.3.134
This paper presents the design of the compact UHF Bandpass filter of CT-type with a novel mixed coupling topology. In further detail, this new coupling structure mathematically equals the transmission zero that enables particularly the better rejection performance in the stopband without increasing the filter's order. To envision this design concept, we fabricated a microstrip filter whose measurement proves to agree with the predicted performance and the suggested coupling structure reduces the overall size, and will be possibly used in the miniaturized UHF apparatus such as the RFID system.
A Conical-Cylindrical Monopole Antenna
Jeong, Hye-Mi ; Park, Seong-Bae ; Kim, Choon-Won ; Sodnomtseren, Ononchimeg ; Bang, Jai-Hoon ; Ahn, Biemg-Chearl ;
Journal of electromagnetic engineering and science, volume 7, issue 3, 2007, Pages 138~146
DOI : 10.5515/JKIEES.2007.7.3.138
In this paper, a monopole antenna of conical-cylindrical compound shape is presented. The conventional circular conical monopole antenna is modified by placing a cylinder at the top of the inverted cone. The cylindrical portion is useful in the wide band impedance matching, in adjusting the antenna gain in the horizontal direction, and in reducing the cone diameter. The dependence of the antenna performance on various geometric parameters is investigated using a commercial electromagnetic simulation software, from which an optimum design of the antenna is derived. The diameter of the circular ground plane is minimized to 115 wavelength at the lowest operating frequency. The antenna proposed in this study shows a reflection coefficient less than -10 dB and a 1
6 dBi gain over 3
20 GHz frequencies. The antenna shows a circular-symmetric radiation pattern in the horizontal plane and a null-free pattern in the vertical direction over the whole operating frequency range.