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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 27, Issue 8 - Sep 2016
Volume 27, Issue 7 - Aug 2016
Volume 27, Issue 6 - Jul 2016
Volume 27, Issue 5 - Jun 2016
Volume 27, Issue 4 - Apr 2016
Volume 27, Issue 3 - Mar 2016
Volume 27, Issue 2 - Feb 2016
Volume 27, Issue 1 - Jan 2016
Selecting the target year
Realization of Optimum Loads for Maximum WPT Efficiencies Using Multi-Turn Receiving Coil
Hwang, Sungyoun ; Lee, Bomson ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 335~341
DOI : 10.5515/KJKIEES.2016.27.4.335
In this paper, we propose the method of controling the turns of a receiving coil for the matching directly to the receiver input impedance(typically
) with a maximum wireless power transfer(WPT) efficiency. Based on the presented the expression of the optimum load depending on a system figure of merit, number of the turns of a receiving coil, and proximity effect between conducting lines, the theoretical efficiencies have been compared with the measured ones with a good agreement. The results of this work may be used to realize a allowable maximum efficiency with a simple and low-profile 2-coil WPT system not requiring a separate feeding loop.
Ultra High-Gain Displaced-Axis Metal Reflectarray Antenna for Millimeter-Wave Region
Yi, Minwoo ; Yang, Jongwon ; Lee, Woosang ; Jang, Won ; So, Joonho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 342~349
DOI : 10.5515/KJKIEES.2016.27.4.342
We design a displaced-axis Gregorian dual antenna in the form of a metal reflectarray antenna for millimeter wave region, W-band. Unlike a reflectarray composed of printed patch antennas on a dielectric substrate, metallic rectangular waveguide unit-cells are proposed to avoid the loss of substrate and take an advantage of ease of typical metal machining fabrication. In this paper, the radiation characteristics of constructed metal reflectarray antennas show ultra high-gain antenna over 50 dBi at a target frequency in W-band. The experimental measurements are conducted in millimeter-wave compact range antenna measurement system.
Small Mu-Zero Zeroth Order Resonance Antenna with Parasitic Patch
Um, Kwi Seob ; Lee, Chang-Hyun ; Lee, Jae-Gon ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 350~357
DOI : 10.5515/KJKIEES.2016.27.4.350
In this paper, a small mu-zero zeroth order resonance(ZOR) antenna based on meta structure is proposed using parasitic patch at 5.8 GHz. The mu-zero ZOR antenna is designed by utilizing the resonance of series inductance and capacitance of mu-negative transmission line and its size can be further reduced by a simple parasitic patch. The parasitic patch can increase series capacitance of mu-negative transmission line related to a resonant frequency. We have simulated and optimized dimension of the parasitic patch using Ansys commercial simulator(HFSS). As a result, the antenna has the following characteristics: kr of 0.59, efficiency of 92 %, and gain of 6.57 dBi. Also, its size is reduced by 24 % compared to a conventional mu-zero ZOR antenna. The measured results are in good agreement with the simulated results.
Design of W-Band Cassegrain Antenna for Beam Steering
Park, Myung-Hoon ; Han, Jun-Yong ; Lee, Taek-Kyung ; Lee, Jae-Wook ; Oh, Gyung-Hyun ; Song, Sung-Chan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 358~368
DOI : 10.5515/KJKIEES.2016.27.4.358
In this paper, for the mechanical beam steering of the Cassegrain antenna, the steering performances of the main reflector tilting method are characterized, and the Cassegrain antenna for the antenna rotating method is designed and its performances are measured. In the Cassegrain antenna operating at W-band, the changes of characteristics due to changes in the sizes of the main/sub-reflectors and other structural changes are analyzed to obtain the structural variables satisfying the performance goal. The manufactured antenna in W-band shows the measured gain of 42.08 dBi, 3 dB beamwidth of
and the return loss(
) of -23.58 dB at the center frequency of 94 GHz.
Combination System Design of 5G Candidate Modulation and Full Duplex Communication for the Spectrum Efficiency Enhancement
An, Changyoung ; Ryu, Heung-Gyoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 369~376
DOI : 10.5515/KJKIEES.2016.27.4.369
In this paper, we propose and design a SSD(Simultaneous Single band Duplex) system using 5G(Generation) candidate modulations. Especially, we consider HPA(High Power Amplifier) nonlinearity in the proposed system. And then, we evaluate and analyze performance of the proposed system. As simulation results, performance of SSD-OFDM(Orthogonal Frequency Division Multiplexing), SSD-FMC (Universal Filtered Multi-Carrier), and SSD-FBMC(Filter Bank Multi-Carrier) is severely degraded by HPA nonlinearity. However, performance of SSD-OFDM, SSD-UFMC, and SSD-FBMC is similar in the same condition. That is, OFDM, UFMC, and FBMC have a similar PAPR(Peak to Average Power Ratio) characteristic. Finally, we can confirm that the proposed SSD system can not cancel(SI) self-interference effectively by strong HPA nonlinearity. That is, Reducing PAPR is important in order to avoid effect of HPA nonlinearity in the proposed SSD system.
Design and Manufacture of FMCW Radar with Multi-Frequency Bandwidths
Hwang, Ji-hwan ; Kim, Seung Hee ; Kang, Ki-mook ; Kim, Duk-Jin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 377~387
DOI : 10.5515/KJKIEES.2016.27.4.377
Design of X-band frequency FMCW based imaging radar with multi-resolutions and performances of the self-manufactured radar system are presented in this study. In order to implement the multi-bandwidths, a ramp sequence of the FMCW signal is consisting of two kinds of 'saw-tooth' waveform with different bandwidth, and a receiver circuit consisting of L-band source and frequency converter circuit is used to effectively extract spectra of beat-frequency from the received signal of X-band frequency. The system setups for performance measurement of self-manufactured radar system are maximum output power of 35 dBm, sampling frequency of 1.2 MHz and sweep time of 1 ms. Then, the measured resolutions of the modulated signal having bandwidth of 500 MHz and 300 MHz in range & azimuth-direction are (0.28 m, 0.26 m) and (0.44 m, 0.27 m), respectively.
Compressive Sensing-Based L1-SVD DOA Estimation
Cho, Yunseong ; Paik, Ji-Woong ; Lee, Joon-Ho ; Ko, Yo Han ; Cho, Sung-Woo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 388~394
DOI : 10.5515/KJKIEES.2016.27.4.388
There have been many studies on the direction-of-arrival(DOA) estimation algorithm using antenna arrays. Beamforming, Capon's method, maximum likelihood, MUSIC algorithms are the main algorithms for the DOA estimation. Recently, compressive sensing-based DOA estimation algorithm exploiting the sparsity of the incident signals has attracted much attention in the signal processing community. In this paper, the performance of the L1-SVD algorithm, which is based on fitting of the data matrix, is compared with that of the MUSIC algorithm.
Metal Phone MIMO Antenna Using the Auxiliary Letter Slot
Lee, Won-hee ; Son, Taeho ; Jo, Youngmin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 395~398
DOI : 10.5515/KJKIEES.2016.27.4.395
In this paper, a hybrid MIMO antenna for the mobile communication metal phone with auxiliary letter slot is designed and implemented. Auxiliary letter slot locates on the rear metal cover of the phone, and operates on LTE class 40 band. The slots of two letters are designed and operated with monopole+IFA hybrid antenna. Antenna satisfies under VSWR 3: 1 for LTE class 13 / LTE class 14 / CDMA / GSM / DCS / PCS / W-CDMA / LTE class 40 bands. Average gains and antenna efficiencies measured by the anechoic chamber were -5.57~-1.45 dBi and 27.75~71.6 %, respectively.
A Continuously Frequency Tunable Electromagnetic Wave Absorber Using Varactor Diodes and Multiple Slits
Cho, Soo-Bean ; Jo, Eon-Seok ; Kim, Dongho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 399~402
DOI : 10.5515/KJKIEES.2016.27.4.399
We propose a thin electromagnetic wave absorber using varactor diodes combined with intentionally introduced multiple slits, which enables continuous sweep of an absorption frequency band throughout relatively wide frequencies. The absorption frequency range of conventional electrically tunable absorbers has been restricted by high capacitance of varactor diodes. In order to overcome the problem, we introduce parasitic capacitance and connect them with varactors in series, which reduces the total capacitance dramatically. As a result, we can raise the operating absorption frequency up to the X-band region. Moreover, we can also control the operating frequencies by modifying the number of slits with little change in an entire frequency sweep range. Good agreement between simulated and measured results show the validity of our proposal.
Design and Implementation of the Small Size Microwave Sensor Receiver for Human Body Detection
Son, Hong-Min ; Choi, Hyun-Ho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 27, issue 4, 2016, Pages 403~406
DOI : 10.5515/KJKIEES.2016.27.4.403
This paper presents the design and implementation of the small size receiver to put a passive microwave sensor for human body detection to practical use. The requirements and specifications of the sensor receiver are drawn using the experimental data of human body detection by the existing sensor operated at 5.1 GHz. The small size sensor receiver to satisfy the drawn specifications is designed and implemented. The effectiveness of the fabricated sensor with small size receiver on human body detection is demonstrated experimentally in laboratory. The results show the sensor can detect human body to within 4 m distance from the antenna. The size and power consumption of the small size receiver are decreased to 60 % and 40 % compared to those of the existing receiver, respectively.