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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
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Volume & Issues
Volume 11, Issue 4 - Dec 2011
Volume 11, Issue 3 - Sep 2011
Volume 11, Issue 2 - Jun 2011
Volume 11, Issue 1 - Mar 2011
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Microstrip Square Open Loop Metamaterial Resonator and Rat Race Coupler for Low Phase Noise Push-Push VCO
Choi, Jae-Won ; Seo, Chul-Hun ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 235~238
DOI : 10.5515/JKIEES.2011.11.4.235
In this paper, a novel low phase noise voltage-controlled oscillator (VCO) using metamaterial structure and rat race coupler is presented for reducing the phase noise without the reduction of the frequency tuning range. The metamaterial structure has been realized by microstrip square open loop double split ring resonator (SRR). The rat race coupler shows slightly higher transmission compared to a Wilkinson combiner and is, therefore, used instead to improve the performances of VCO. By providing these unique modifications, the proposed push-push VCO has a phase noise of -126.30~-124.83 dBc/Hz at 100 kHz in the tuning range of 5.672~5.800 GHz.
8 Antenna Polar Switching Up-Down Relay Networks
Li, Jun ; Lee, Moon-Ho ; Yan, Yier ; Peng, Bu Shi ; Hwang, Gun-Joon ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 239~249
DOI : 10.5515/JKIEES.2011.11.4.239
In this paper, we propose a reliable
up-down switching polar relay code based on 3GPP LTE standard, motivated by 3GPP LTE down link, which is 30 bps/Hz for
MIMO antennas, and by Arikan`s channel polarization for the frequency selective fading (FSF) channels with the generator matrix
. In this scheme, a polar encoder and OFDM modulator are implemented sequentially at both the source node and relay nodes, the time reversion and complex conjugation operations are separately implemented at each relay node, and the successive interference cancellation (SIC) decoder, together with the cyclic prefix (CP) removal, is performed at the destination node. Use of the scheme shows that decoding at the relay without any delay is not required, which results in a lower complexity. The numerical result shows that the system coded by polar codes has better performance than currently used designs.
Using Subspace Pursuit Algorithm to Improve Performance of the Distributed Compressive Wide-Band Spectrum Sensing
Le, Thanh Tan ; Kong, Hyung-Yun ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 250~256
DOI : 10.5515/JKIEES.2011.11.4.250
This paper applies a compressed algorithm to improve the spectrum sensing performance of cognitive radio technology. At the fusion center, the recovery error in the analog to information converter (AIC) when reconstructing the transmit signal from the received time-discrete signal causes degradation of the detection performance. Therefore, we propose a subspace pursuit (SP) algorithm to reduce the recovery error and thereby enhance the detection performance. In this study, we employ a wide-band, low SNR, distributed compressed sensing regime to analyze and evaluate the proposed approach. Simulations are provided to demonstrate the performance of the proposed algorithm.
A Highly Efficient Rectenna Using Harmonic Rejection Capability
Kim, Youg-Hwan ; Lim, Sung-Joon ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 257~261
DOI : 10.5515/JKIEES.2011.11.4.257
A highly efficient 2.4 GHz rectenna is designed using a harmonic rejection bandpass filter. The rectenna is printed on Rogers Duroid 5880 substrate with
Outage Analysis of Cooperative Transmission in Two-Dimensional Random Networks over Rayleigh Fading Channels
Tran, Trung Duy ; Kong, Hyung-Yun ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 262~268
DOI : 10.5515/JKIEES.2011.11.4.262
In this paper, we evaluate the outage performance of cooperative transmission in two-dimensional random networks. Firstly, we derive the joint distributions of the source-relay and the relay-destination links. Secondly, the outage probability for the decode-and-forward relaying system is derived when selection combining (SC) is employed at the destination. Finally, we calculate the average outage probability of the system and then attempt to express it by a simple approximate expression. The simulation results are presented to verify the accuracy of the derivations. Similar to deterministic networks, the cooperative transmission in random networks outperforms direct transmission at a high signal-to-noise ratio (SNR).
A Safe and Reliable Method for Installing Wireless LAN into a Hospital
Hanada, Eisuke ; Kudou, Takato ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 269~273
DOI : 10.5515/JKIEES.2011.11.4.269
A medical environment in which patient information can be accessed anytime / anywhere is called a "ubiquitous environment". To realize such an environment, the installation of wireless LAN is quite effective. Because the maximum radio wave output (antenna power) is set low in Japan, it has been easy to safely introduce wireless LAN into hospitals, to date mainly into large hospitals. However, if the placement of access points is not done properly, problems will occur, such as signals not reaching the desired area. A solution to these types of problems is to do an electromagnetic-field propagation simulation, which should be performed before construction of the hospital. It is also necessary to protect against security problems, such as signal interception or illegal access. We herein show our procedures for the safe introduction of wireless LAN.
Investigation of Relation between EFTB Test and RF Conductive Immunity Test Using BER and Baseband Signal
Kuwabara, Nobuo ; Irie, Yasuhiro ; Hirasawa, Norihito ; Akiyama, Yoshiharu ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 274~281
DOI : 10.5515/JKIEES.2011.11.4.274
High-speed telecommunication systems are influenced by electromagnetic environments because they need a wide bandwidth to transmit signals. Immunity tests of telecommunication equipment are effective for improving its immunity to electromagnetic environments. However, immunity tests are expensive to carry out because there are several different tests. The correlation among the tests should therefore be examined in order to reduce the kinds of tests that are necessary. This paper investigates the correlation between the electrical fast transient/burst (EFTB) test and the radio frequency (RF) conductive immunity test. Imitation equipment was constructed with a balun, and a baseband signal was transmitted from the associated equipment to the imitation equipment. Then, disturbances were applied to the equipment, and the telecommunication quality was evaluated by using the bit error rate (BER). The results from the EFTB test indicated that the BER was less than
and the value was independent of the peak value. The results from the RF conductive immunity test indicated that the BER was affected by the longitudinal conversion loss (LCL).
GHz EMI Characteristics of 3D Stacked Chip PDN with Through Silicon Via (TSV) Connections
Pak, Jun-So ; Cho, Jong-Hyun ; Kim, Joo-Hee ; Kim, Ki-Young ; Kim, Hee-Gon ; Lee, Jun-Ho ; Lee, Hyung-Dong ; Park, Kun-Woo ; Kim, Joung-Ho ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 282~289
DOI : 10.5515/JKIEES.2011.11.4.282
GHz electromagnetic interference (EMI) characteristics are analyzed for a 3dimensional (3D) stacked chip power distribution network (PDN) with through silicon via (TSV) connections. The EMI problem is mostly raised by P/G (power/ground) noise due to high switching current magnitudes and high PDN impedances. The 3D stacked chip PDN is decomposed into P/G TSVs and vertically stacked capacitive chip PDNs. The TSV inductances combine with the chip PDN capacitances produce resonances and increase the PDN impedance level in the GHz frequency range. These effects depend on stacking configurations and P/G TSV designs and are analyzed using the P/G TSV model and chip PDN model. When a small size chip PDN and a large size chip PDN are stacked, the small one`s impedance is more seriously affected by TSV effects and shows higher levels. As a P/G TSV location is moved to a corner of the chip PDNs, larger PDN impedances appear. When P/G TSV numbers are enlarged, the TSV effects push the resonances to a higher frequency range. As a small size chip PDN is located closer to the center of a large size chip PDN, the TSV effects are enhanced.
Live Electrooptic Imaging Camera for Real-Time Visual Accesses to Electric Waves in GHz Range
Tsuchiya, Masahiro ; Shiozawa, Takahiro ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 290~297
DOI : 10.5515/JKIEES.2011.11.4.290
Recent progresses in the live electrooptic imaging (LEI) technique are reviewed with emphasis on its functionality of real-time visual accesses to traveling electric waves in the GHz range. Together with the principles, configurations, and procedures for the visual observation experiments by an LEI camera system, the following results are described as examples indicating the wide application ranges of the technique; Ku-band waves on arrayed planar antennas, waves on a Gb/s-class digital circuit, W-band waves traveling both in slab-waveguide modes and aerially, backward-traveling wave along composite right/left-handed transmission line, and, waves in monolithic microwave integrated circuit module case.
Frequency Tracking of Resonance Frequency Variation of L-C Circuits for Wireless Energy Transmission to Medical Devices in Human Organs
Gimm, Yoon-Myoung ; Ju, Young-Jun ; Lee, Yu-Ri ; Lee, Dong-Yeol ; Wang, Jong-Wook ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 298~303
DOI : 10.5515/JKIEES.2011.11.4.298
A capsular endoscope (CE) for inspection of the large intestine requires a motor for backward navigation against the autonomous travel in the intestine. This study proposes an HF power system for generating a magnetic field and for delivering wireless power to the internal or implanted medical devices. The magnetic field is generated by a wound coil (L) around a wooden frame, and the current is driven to the coil through a resonating capacitor (C). The characteristics of the resonance frequency shifting of the L-C series circuit are analyzed. A stable magnetic field intensity in the field coil is maintained by a specially designed frequency tracking system that automatically follows the L-C resonance frequency. Testing confirmed that the oscillation system tracks well the parameter changes of the electric components caused by the operating conditions or environmental variations.
System Strategies for Time-Domain Emission Measurements above 1 GHz
Hoffmann, Christian ; Slim, Hassan Hani ; Russer, Peter ;
Journal of electromagnetic engineering and science, volume 11, issue 4, 2011, Pages 304~310
DOI : 10.5515/JKIEES.2011.11.4.304
The application of time-domain methods in emission measurement instruments allows for a reduction in scan time by several orders of magnitude and for new evaluation methods to be realized such as the real-time spectrogram to characterize transient emissions. In this paper two novel systems for time-domain EMI measurements above 1 GHz are presented. The first system combines ultra-fast analog-to-digital-conversion and real-time digital signal processing on a field-programmable-gate-array (FPGA) with ultra-broadband multi-stage down-conversion to enable measurements in the range from 10 Hz to 26 GHz with high sensitivity and full-compliance with the requirements of CISPR 16-1-1. The required IF bandwidths were added to allow for measurements according to MIL-461F and DO-160F. The second system realizes a system of time-interleaved analog-to-digital converters (ADCs) and has an upper bandwidth limit of 4 GHz. With the implementation of an automatic mismatch calibration, the system fulfills CISPR 16-1-1 dynamic range requirements. Measurements of the radiated emissions of electronic consumer devices and household appliances like the non-stationary emissions of a microwave oven are presented. A measurement of a personal computer`s conducted emissions on a power supply line according to DO-160F is given.