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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
Journal Basic Information
Journal DOI :
The Korean Institute of Electromagnetic Engineering and Science
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Volume & Issues
Volume 25, Issue 12 - Dec 2014
Volume 25, Issue 11 - Nov 2014
Volume 25, Issue 10 - Oct 2014
Volume 25, Issue 9 - Sep 2014
Volume 25, Issue 8 - Aug 2014
Volume 25, Issue 7 - Jul 2014
Volume 25, Issue 6 - Jun 2014
Volume 25, Issue 5 - May 2014
Volume 25, Issue 4 - Apr 2014
Volume 25, Issue 3 - Mar 2014
Volume 25, Issue 2 - Feb 2014
Volume 25, Issue 1 - Jan 2014
Selecting the target year
The Radiation Efficiency Change according to the Slot Antenna Location
Jeon, Ji-Hwan ; Liu, Yang ; Lee, Jae-Seok ; Kim, Hyeong-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 381~386
DOI : 10.5515/KJKIEES.2014.25.4.381
In this paper, the effect of slot antenna`s location in the radiation performance and impedance bandwidth was analyzed. The proposed antenna was designed to operate at Wi-Fi band(2.4~2.5 GHz) when the slot antenna is located at the center of the ground plane, the proposed antenna has a bandwidth of 340 MHz(2.24~2.58 GHz) under voltage standing wave ratio of
Wide Bandwidth PIFA Design Using Reactive Element
Jo, Ha-Seok ; Moon, Sung-Jin ; Park, Kyong-Nam ; Lee, Jae-Seok ; Kim, Hyeong-Dong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 387~392
DOI : 10.5515/KJKIEES.2014.25.4.387
In this paper, the broadband antenna design, which can be applied to USB Dongle, supporting Wibro(2.3~2.4 GHz), Wi-Fi(2.4~2.5 GHz) and LTE7(2.5~2.7 GHz) is proposed technique. The proposed antenna was designed similar to PIFA type antennas. Reactive elements were used to control the input impedance and wideband characteristics were achieved by controlling coupling between the feed structure and the radiator. As a result, the antenna printed on FR-4 PCB(
Transmitter Design for Earth Station Terminal Operating with Military Geostationary Satellites on Ka-band
Kim, Chun-Won ; Park, Byung-Jun ; Yoon, Won-Sang ; Lee, Seong-Jae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 393~400
DOI : 10.5515/KJKIEES.2014.25.4.393
In this paper, we have designed the transmitter for earth station terminal operating with military geostationary satellite on Ka-band that is complied with MIL-STD-188-164A. The designed antenna of this terminal is dual-offset gregorian reflector which is consist of corrugated horn and iris polarizer, othermode transducer. This antenna meets radiation pattern and transmit EIRP spectral density requirements in this standard. The designed RF systems of this terminal are consist of Block Up Converter(BUC) converting frequency band from IF to Ka band and SSPA having low-power consumption and compact light-weight using the pHEMT MMIC compound devices. This RF systems applied with VSWR, spurious/harmonic suppression, output flatness and phase noise requirement in this standard.
Concurrent Dual-Band Class-E Power Amplifier Using a Multi-Harmonic Matching Network
Park, Seung-Won ; Jeon, Sanggeun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 401~410
DOI : 10.5515/KJKIEES.2014.25.4.401
This paper presents a high-efficiency concurrent dual-band Class-E power amplifier(PA) that is based on a multi-harmonic matching network(MHMN). The proposed MHMN controls the impedance at 1.3 GHz, 2.1 GHz, and their second and third harmonics, respectively, by using transmission lines only rather than switches or lumped components. The dual-band Class-E PA is implemented using Avago ATF-50189 GaAs p-HEMT. The PA exhibits a measured output power of 27.1 dBm and 25.7 dBm, a power gain of 6.1 dB and 4.7 dB, and a drain efficiency of 71.2 % and 60.1 % at 1.3 GHz and 2.1 GHz, respectively.
Efficient OFDM Frame Synchronization Scheme for LED-ID Systems
Kim, Kyung-Ho ; Park, Young-Sik ; Hwang, Yu-Min ; Kim, Jin-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 411~417
DOI : 10.5515/KJKIEES.2014.25.4.411
In this paper, we propose an efficient OFDM(Orthogonal Frequency Division Multiplexing) frame synchronization scheme for LED-ID(Identification) systems. A frame synchronization is an essential procedure for normal operations of OFDM systems. Bernoulli-Gaussian noise is considered in LED-ID systems` environments. In order to enhance the OFDM frame synchronization performance, we add a ROGS(Repeated Orthogonal Gold Sequence) to OFDM signals in the time domain. The power level of a ROGS does not affect a normal operation of the LED-ID systems. Frame synchronization can be achieved successfully over LED-ID channels interfered by impulsive noise owing to good auto and cross-correlation properties of the ROGS.
Doppler Radar System for Long Range Detection of Respiration and Heart Rate
Lee, Jee-Hoon ; Kim, Ki-Beom ; Park, Seong-Ook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 418~425
DOI : 10.5515/KJKIEES.2014.25.4.418
This paper presents a Ku-Band Doppler Radar System to measure respiration and heart rate. It was measured by using simultaneous radar and ECG(Electrocardiogram). Arctangent demodulation without dc offset compensation can be applied to transmitted I/Q(In-phase & Quadrature-phase) signal in order to improve the RMSE(Root Mean Square Error) about 50 %. The power leaked to receiving antenna from the transmitting antenna is always generated because of continuously opening the transceiver of CW(Continuous Wave) Doppler radar. As the output power increase, leakage power has an effect on the SNR(Signal-to-Noise Ratio) of the system. Therefore, in this paper, leakage cancellation technique that adds the signal having the opposite phase of the leakage power to the leakage power was implemented in order to minimize the decline of receiver sensitivity. By applying the leakage cancellation techniques described above, it is possible to measure the heart rate and respiration of the human at a distance of up to 35 m. the heart rate of the measured data at a distance of 35 m accords with the heart rate extracted from the ECG data.
Electromagnetic Pulse Coupling into Naval Warship and Protective Measures
Yang, Jin-Ho ; Nam, Sang-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 426~433
DOI : 10.5515/KJKIEES.2014.25.4.426
The high-altitude electromagnetic pulse(HEMP) generated by a high-altitude nuclear explosion. This paper presents the comparison of electric field penetration in Bell laboratories and IEC 61000-2-9 standard when HEMP source penetrates through Naval Warship conducted coupling path and radiated coupling path. Also we analyze the effects of two kinds of coupling and propose Protective measures. Simulation results confirm IEC 61000-2-9 standard is more strict than the Bell Laboratories standard except for a lower frequency band, so we proposed IEC 61000-2-9 standard as a Naval HEMP standard. Finally, we offer the protective measures such as the shielding coating, Honeycomb ventilation, TVS in order to meet the military criteria.
Analysis of Interference Protection Criteria for Interoperability of Radar Systems
Kim, Jung ; Jung, Jung-Soo ; Kwag, Young-Kil ; Kim, Jin-Goog ; Jeon, Young-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 434~441
DOI : 10.5515/KJKIEES.2014.25.4.434
Recently, a mutual interference threat has been increasing among the radar systems due to the rapid growth of the military radar operation. In this paper, the radar interference protection criteria is presented for interoperability in terms of the radar coverage and target detection probability in association with the international recommendation on the interference spectrum by ITU-R. The required criteria for the minimum allowable interference is also presented in terms of INR. In order to ensure the maximum detection probability of the radar under the mutual interference situation, only 5 % of detection range loss is allowed for the case of INR of -6 dB, and required SNR is presented at each INR in terms of the detection range and detection probability. This result will be useful for establishing the interference protection criteria in the combined military radar systems.
Study of Microwave Propagation Characteristics of Matching Liquids for the Microwave Cancer Detection System
Kim, Jang-Yeol ; Minz, Laxmikant ; Lee, Kwang-Jae ; Son, Seong-Ho ; Jeon, Soon-Ik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 442~450
DOI : 10.5515/KJKIEES.2014.25.4.442
This paper is a study of the propagation characteristic of matching liquids in the skin-covered breast model. In order to evaluate the matching liquids, we investigated six kinds of matching liquids applied to proposed 1-D breast model from frequency range of 3~6 GHz. A uniform plane wave is projected / transmitted inside the multi-layered breast model. Then the propagation characteristics inside the model and the transmission loss of each matching liquids were analyzed. The studying method presented in the paper can be used in the breast cancer detection system, the field of cancer detection using human tissue and the field of other medical devices. This paper was applied to the breast cancer detection system. Consequently, these studies could be used to determine the suitable type of matching liquids for breast cancer detection system and to apply useful for performance analysis.
Simulation of Bistatic Inverse Synthetic Aperture Radar Image Generation
Han, Seung-Ku ; Kim, Kyung-Tae ; Yang, Eun-Jung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 451~458
DOI : 10.5515/KJKIEES.2014.25.4.451
This paper introduces a bistatic ISAR imaging technique. In bistatic geometry, the transmitter and receiver are placed in different locations. The monostatic ISAR is inadequate not only for obtaining images on targets approaching along the radar`s line of sight, but also for stealth targets. In this paper, geometry, signal modeling as well as bistatic Doppler for bistatic ISAR are introduced to address these problems. Simulations results show bistatic ISAR images as well as monostatic ISAR images against target`s moving scenarios, and analyze their differences for each scenario.
Feature Extraction and Classification of Target from Jet Engine Modulation Signal Using Frequency Masking
Kim, Si-Ho ; Kim, Chan-Hong ; Chae, Dae-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 459~466
DOI : 10.5515/KJKIEES.2014.25.4.459
This paper deals with the method to classify the aircraft target by analyzing its JEM signal. We propose the method to classify the engine model by analyzing JEM spectrum using the harmonic frequency mask generated from the blade information of jet engine. The proposed method does not need the complicated logic algorithm to find the chopping frequency in each rotor stage and the pre-simulated engine spectrum DB used in the previous methods. In addition, we propose the method to estimate the precise spool rate and it reduces the error in estimating the number of blades or in calculating the harmonic frequency of frequency mask.
A Study on the Formulation of High Resolution Range Profile and ISAR Image Using Sparse Recovery Algorithm
Bae, Ji-Hoon ; Kim, Kyung-Tae ; Yang, Eun-Jung ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 467~475
DOI : 10.5515/KJKIEES.2014.25.4.467
In this paper, we introduce a sparse recovery algorithm applied to a radar signal model, based on the compressive sensing(CS), for the formulation of the radar signatures, such as high-resolution range profile(HRRP) and ISAR(Inverse Synthetic Aperture Radar) image. When there exits missing data in observed RCS data samples, we cannot obtain correct high-resolution radar signatures with the traditional IDFT(Inverse Discrete Fourier Transform) method. However, high-resolution radar signatures using the sparse recovery algorithm can be successfully recovered in the presence of data missing and qualities of the recovered radar signatures are nearly comparable to those of radar signatures using a complete RCS data without missing data. Therefore, the results show that the sparse recovery algorithm rather than the DFT method can be suitably applied for the reconstruction of high-resolution radar signatures, although we collect incomplete RCS data due to unwanted interferences or jamming signals.
Analysis of Backscattering Coefficients of Corn Fields Using the First-Order Vector Radiative Transfer Technique
Kweon, Soon-Koo ; Hwang, Ji-Hwan ; Park, Sin-Myeong ; Hong, Sungwook ; Oh, Yisok ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 476~482
DOI : 10.5515/KJKIEES.2014.25.4.476
In this study, we analyzed the effect of corn growth on the radar backscattering coefficient. At first, we measured the backscattering coefficients of various corn fields using a polarimetric scatterometer system. The backscattering coefficients of the corn fields were also computed using the 1st-order VRT(Vector Radiative Transfer) model with field-measured input parameters. Then, we analyzed the experimental and numerical backscattering coefficients of corn fields. As a result, we found that the backscatter from an underlying soil layer is dominant for early growing stage. On the other hand, for vegetative stage with a higher LAI(Leaf-Area-Index), the backscatter from vegetation canopy becomes dominant, and its backscattering coefficients increase as incidence angle increases because of the effect of leaf angle distribution. It was also found that the estimated backscattering coefficients agree quite well with the field-measured radar backscattering coefficients with an RMSE(Root Mean Square Error) of 1.32 dB for VV-polarization and 0.99 dB for HH-polarization. Finally, we compared the backscattering characteristics of vegetation and soil layers with various LAI values.
Optimization of a Flip-Chip Transition for Signal Integrity at 60-GHz Band
Kam, Dong Gun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 483~486
DOI : 10.5515/KJKIEES.2014.25.4.483
Although flip-chip interconnects have smaller parasitics than bonding wires, they should be carefully designed at 60 GHz. Insertion loss at a flip-chip transition may differ as much as 2 dB depending on design parameters. In this paper we present a comprehensive sensitivity analysis to optimize the flip-chip transition.
Design of 77-GHz Automotive Radar Frontend Modules
Park, Sangwook ; Kwon, Manseok ; Kam, Dong Gun ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 25, issue 4, 2014, Pages 487~490
DOI : 10.5515/KJKIEES.2014.25.4.487
This paper describes a design of an automotive radar frontend module with taking care of the routing of 77-GHz signals on a printed circuit board including wire-bond and waveguide transitions.