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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 24, Issue 12 - Dec 2013
Volume 24, Issue 11 - Nov 2013
Volume 24, Issue 10 - Oct 2013
Volume 24, Issue 9 - Sep 2013
Volume 24, Issue 8 - Aug 2013
Volume 24, Issue 7 - Jul 2013
Volume 24, Issue 6 - Jun 2013
Volume 24, Issue 5 - May 2013
Volume 24, Issue 4 - Apr 2013
Volume 24, Issue 3 - Mar 2013
Volume 24, Issue 2 - Feb 2013
Volume 24, Issue 1 - Jan 2013
Selecting the target year
Design of a MIMO Antenna Using a RF MEMS Element
Lee, Won-Woo ; Rhee, Byung-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1113~1119
DOI : 10.5515/KJKIEES.2013.24.12.1113
In this letter, a new approach is proposed for the design of a multi antenna for MIMO wireless devices. The proposed antenna covers various LTE(Long Term Evolution) service bands: band 17(704~746 MHz), band 13(746~787 MHz), band 5(824~894 MHz), and band 8(880~960 MHz). The proposed main antenna consists of a conventional monopole antenna with an inverted L-shaped slit for wideband operation. The proposed the LTE sub antenna is based on a switch loaded loop antenna structure, with a resonance frequency that can be controlled by capacitance of a logic circuit. The tuning technique for the LTE Rx antenna uses a RF MEMS(Micro-Electro mechanical system) to match the impedances to realize the bands of interest. Because the two proposed antennas are polarized orthogonally to each other, the ECC(Envelope Correlation Coefficient) characteristic between two antennas was measured to be very low (below 0.06) with an isolation characteristic below -20 dB between the two antennas in the operating overall LTE bands. The proposed antenna is particularly attractive for mobile devices that integrate LTE multiple systems.
Microwave Frequency Responses of Novel Chip-On-Chip Flip-Chip Bump Joint Structures
Oh, Kwang-Sun ; Lee, Sang-Kyung ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1120~1127
DOI : 10.5515/KJKIEES.2013.24.12.1120
In this paper, novel chip-on-chip(CoC) flip-chip bump structures using chip-on-wafer(CoW) process technology are proposed, designed and fabricated, and their microwave frequency responses are analyzed. With conventional bumps of Cu pillar/SnAg and Cu pillar/Ni/SnAg and novel Polybenzoxazole(PBO)-passivated bumps of Cu pillar/SnAg, Cu pillar/Ni/SnAg and SnAg with the deposition option of
Polyimide(PI2) layer on the wafer, 10 kinds of CoC samples are designed and their frequency responses up to 20 GHz are investigated. The measurement results show that the bumps on the wafers with PI2 layers are better for the batch flip-chip process and have average insertion loss of 0.14 dB at 18 GHz. The developed bump structures for chips with fine-pitch pads show similar or slightly better insertion loss of 0.11~0.14 dB up to 18 GHz, compared with that of 0.13~0.17 dB of conventional bump structures in this study, and we find that they could be utilized in various microwave packages for high integration density.
Development of Mobile Active Transponder for KOMPSAT-5 SAR Image Calibration and Validation
Park, Durk-Jong ; Yeom, Kyung-Whan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1128~1139
DOI : 10.5515/KJKIEES.2013.24.12.1128
KOMPSAT-5(KOrea Multi-Purpose SATellite-5) has a benefit of continuously conducting its mission in all weather and even night by loading SAR(Synthetic Aperture Radar) payload, which is different from optical sensor of KOMPSAT-2 satellite. During IOT(In-Orbit Test) periods, SAR image calibration should be conducted through ground target of which location and RCS is pre-determined. Differently from the conventional corner reflector, active transponder has a capability to change its internal transfer gain and delay, which allows active transponder to be shown in a pixel of SAR image with very high radiance and virtual location. In this paper, the development of active transponder is presented from design to I&T(Integration and Test).
The Study on Empirical Propagation Path Loss in the Airport Cargo Terminal Environment
Kim, Kyung-Tae ; Park, Hyo-Dal ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1140~1147
DOI : 10.5515/KJKIEES.2013.24.12.1140
In this paper, The path loss model of Air Traffic Control(ATC) telecommunication radio channel has been studied at the Incheon International Airport(IIA) Cargo Terminal. We measured one frequency among VHF channel bands. The transmitting site was located at different locations with different heights. The transmitting site radiated the Continuous Wave(CW). The propagation measurement was taken using the moving vehicle equipped with receiver and antenna. The transmitting power, frequency and antenna height are the same as the current operating condition. The path loss exponent and intercept parameters were extracted by the basic path loss model and hata model. The path loss exponent at IIA Cargo terminal area were 3.67 and 3.39 respectively in first and second transmitting sites. The deviation of prediction error is 14.42 and 10.38. The new path loss equation at the IIA Cargo terminal area was also developed using the derived path loss parameters. The new path loss was compared with other models. This result will be helpful for the ATC site selection and service quality evaluation.
Impedance Evaluation Method of UHF RFID Tag Chip for Maximum Read Range
Sim, Yong-Seog ; Yang, Jeen-Mo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1148~1157
DOI : 10.5515/KJKIEES.2013.24.12.1148
In a passive UHF RFID system, the impedance matching between tag antenna and chip as well as the protocol parameter settings in a reader plays important role in determination of the maximum read-range. Almost no paper, however, has dealt with the above issues in relation with the maximum read range. In this paper, two known methods (of using the value from data sheets and proprietary RFID tester) and our proposing method in chip impedance evaluation are compared in terms of maximum read range. The read range of tags whose antenna impedance is conjugate matched with the chip impedance obtained from the proposed method is improved maximum 73 % more than that of tags from the other methods.
Mobi-Kids Study: Exposure Assessment of Electromagnetic Radiation from Mobile Phones -II. Evaluation Method of Head SAR and Cumulative Dose
Lee, Ae-Kyoung ; Hong, Seon-Eui ; Choi, Kyung-Hwa ; Ha, Mina ; Choi, Hyung-Do ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1158~1166
DOI : 10.5515/KJKIEES.2013.24.12.1158
SAR calculation method following the Mobi-Kids study protocol is analyzed and evaluation method of cumulative RF dose from mobile phones which have been used by a subject of case and control groups is proposed. An SAR database is built by calculating SAR distributions in 4 head models at different ages for representative phone models with the same conducted power. To obtain SAR distribution in a subject's head for a specific commercial phone which had/have been used by him/her, an SAR correction factor using SAR compliance test results is determined. Cumulative dose is calculated by considering mobile phone characteristics and use pattern such as call time and laterality(right and left).
Design of X-Band SOM for Doppler Radar
Jeong, Sun-Hwa ; Hwang, Hee-Yong ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1167~1172
DOI : 10.5515/KJKIEES.2013.24.12.1167
This paper presents a X-band doppler radar with high conversion gain using a self-oscillating-mixer(SOM) that oscillation and frequency mixing is realized at the same time. To improve phase noise of the SOM oscillator, a
slotted square patch resonator(SSPR) was proposed, which shows high Q-factor of 175.4 and the 50 % reduced circuit area compared to the conventional resonator. To implement the low power system, low biasing voltage of 1.7 V was supplied. To enhance the conversion gain of the SOM, bias circuit is configured near the pinch-off region of transistor, and the conversion gain was optimized. The output power of the proposed SOM was -3.16 dBm at 10.65 GHz. A high conversion gain of 9.48 dB was obtained whereas DC Power consumption is relatively low about 7.65 mW. The phase noise is -90.91 dBc/Hz at 100 kHz offset. The figure-of-merit(FOM) of the proposed SOM was measured as -181.8 dBc/Hz, which is supplier to other SOMs by more than about 7 dB.
Localization of Jet Engine Position from HRRP-JEM Images of Aircraft Targets Using Eccentricity of Complex-Valued Signals
Park, Ji-Hoon ; Yang, Woo-Yong ; Bae, Jun-Woo ; Kang, Seong-Cheol ; Myung, Noh-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1173~1180
DOI : 10.5515/KJKIEES.2013.24.12.1173
High Resolution Range Profile-Jet Engine Modulation imagery first introduced in 2005 carries out radar target recognition by localizing the position of the jet engine installed on the aircraft target. This paper presents a new approach for estimating the jet engine position in the HRRP-JEM image based on the eccentricity of a complex signal. It can effectively evaluate the contribution of the JEM component to the radar received signal in a range bin of the HRRP-JEM image. Therefore, the localization is expected to be performed more quantitatively and reliably by pinpointing the range bin corresponding to the jet engine position where the JEM contribution is maximized. The simulation results of realistic aircraft models validated the effectiveness of the proposed concept.
Retrodirective Antenna Array Based on Double Conversion Mixer System and Its Application to Cancellation of Electromagnetic Reflections
Ha, Jungje ; Jang, Sunghoon ; Lee, Yongshik ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1181~1189
DOI : 10.5515/KJKIEES.2013.24.12.1181
In this paper, a retrodirective anatenna array system is proposed and the possibility of actively cancelling electromagnetic waves based on this system is investigated. When a rectrodirective array system receives an electromagnetic wave, it can send waves in the direction of the incoming signal without prior knowledge of the direction. In applications to cancellation of radar signals, the system can generate and send signals to the radar so that it cancels the radar signals that are reflected back to the radar. In such a system, isolation between the input and output ports is a key factor that determines the effectiveness of cancellation. In this work, a dual-conversion mixer system is proposed to maximize the isolation. Since this minimizes the difference between the direction of reflection of radar signals and the transmission of cancellation signals, the effectiveness of cancellation is maximized. Experimental results for a metallic plate and metallic cylinder shows as much as 29-dB reduction in reflection for a
retrodirective array based on proposed dual-conversion mixer system, which verifies the proposed method of active cancellation.
Design and Implementation of Radar Resource Management Algorithms for Airborne AESA Radar
Roh, Ji-Eun ; Chon, Sang-Mi ; Ahn, Chang-Soo ; Jang, Seong-Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1190~1197
DOI : 10.5515/KJKIEES.2013.24.12.1190
AESA(Active Electronically Scanned Array radar) radar is able to instantaneously and adaptively position and control the beam, and such adaptive beam pointing of AESA radar enables to remarkably improve the multi-mission capability. For this reason, radar resource management(RRM) becomes new challenging issue. RRM is a technique efficiently allocating finite resources, such as energy and time to each task in an optimal and intelligent way. This paper deals with a design of radar resource management algorithms and simulator implemented main algorithms for development of airborne AESA radar. In addition, evaluation results show that developed radar system satisfies a main requirement about simultaneous multiple target tracking and detection by adopting proposed algorithms.
Resonant Transmission of a Rectangular Waveguide Probe with H-type Small Aperture
Ko, Ji-Hwan ; Cho, Young-Ki ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1198~1204
DOI : 10.5515/KJKIEES.2013.24.12.1198
As a microwave near field probe for near field scanning optical microscope(NSOM) system, H-shaped(ridge type) small aperture is proposed and its performances from the viewpoints of the transmission efficiency(transmission cross section) and spatial confinement(beam spot size) are compared with those of the previous narrow rectangular aperture type. While the transmission efficiencies are comparable to each other for the two structures, the transmitted beam spot size for the proposed H-shaped aperture is much smaller than that for the previous rectangular aperture. This strong point of the H-shaped aperture is expected to significantly improve near-field optical applications such as optical data storage, nanolithography and nanomicroscopy. It is also observed that the transmission efficiency can be improved if the coupling aperture is implemented in the type of the transmission cavity.
Study of RF Impairments in Wideband Chirp Signal Generator
Ryu, Sang-Burm ; Kim, Joong-Pyo ; Yang, Jeong-Hwan ; Won, Young-Jin ; Lee, Sang-Kon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1205~1214
DOI : 10.5515/KJKIEES.2013.24.12.1205
Recently spaceborne SAR systems are increasing image resolution and frequency. As a high quality image resolution, the wider bandwidth is required and a wideband signal generator with RF component is very complicated and RF impairments of device is increased. Therefore, it is very important to improve performance by reducing these errors. In this study, the transmission signal of the wideband signal generator is applied to the phase noise, IQ imbalance, ripple gain, nonlinear model of high power amplifier. And we define possible structures of wideband signal generator and measure the PSLR and ISLR for the performance assesment. Also, we extract error of the amplitude and phase from the waveform and use a quadratic polynomial curve fitting and examine the performance change due to nonlinear device. Finally, we apply a high power amplifier predistortion method for non-linear error compensation. And we confirm that distortion in the output of the amplifier by intermodulation component is decreased by 15 dB.
Development of a 85~115 GHz 90-Deg Phase Shifter Using Corrugated Square Waveguide
Chung, Moon-Hee ; Je, Do-Heung ; Han, Seog-Tae ; Kim, Seung-Rae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 24, issue 12, 2013, Pages 1215~1218
DOI : 10.5515/KJKIEES.2013.24.12.1215
A 90-deg phase shifter using corrugated square waveguide structure for 86 GHz band VLBI(Very Long Baseline Interferometry) dual-circular polarization observation has been developed. The 90-deg phase shifter was designed to have two corrugated walls inside the square waveguide so that the vertically and horizontally polarized waves at the output port have phase differences of
deg across 85~115 GHz. Measurements show that the return and insertion losses for the both polarizations are better than 17 dB and 0.25 dB, respectively. The axial ratio is estimated to be less than 0.6 dB within the required frequency band.