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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 26, Issue 12 - Dec 2015
Volume 26, Issue 11 - Nov 2015
Volume 26, Issue 10 - Oct 2015
Volume 26, Issue 9 - Sep 2015
Volume 26, Issue 8 - Aug 2015
Volume 26, Issue 7 - Jul 2015
Volume 26, Issue 6 - Jun 2015
Volume 26, Issue 5 - May 2015
Volume 26, Issue 4 - Apr 2015
Volume 26, Issue 3 - Mar 2015
Volume 26, Issue 2 - Feb 2015
Volume 26, Issue 1 - Jan 2015
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High Efficiency Active Phased Array Antenna Based on Substrate Integrated Waveguide
Lee, Hai-Young ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 227~247
DOI : 10.5515/KJKIEES.2015.26.3.227
dual-polarized active phased array antenna system has been implemented based on the substrate integrated waveguide(SIW) technology having low propagation loss, complete EM shielding, and high power handling characteristics. Compared with the microstrip case, 1 dB less is the measured insertion loss(0.65 dB) of the 16-way SIW power distribution network and doubled(3 dB improved) is the measured radiation efficiency(73 %) of the SIW sub-array(
) antenna element. These significant improvements of the power division loss and the radiation efficiency using the SIW, save more than 30 % of the total power consumption, in the active phased array antenna systems, through substantial reduction of the maximum output power(P1 dB) of the high power amplifiers. Using the X-band
dual-polarized active phased array antenna system fabricated by the SIW technology, the main radiation beam has been steered by 0, 5, 9, and 18 degrees in the accuracy of 2 degree maximum deviation by simply generating the theoretical control vectors. Performing thermal cycle and vacuum tests, we have found that the SIW array antenna system be eligible for the space environment qualification. We expect that the high efficiency SIW array antenna system be very effective for high performance radar systems, massive MIMO for 5G mobile systems, and various millimeter-wave systems(60 GHz WPAN, 77 GHz automotive radars, high speed digital transmission systems).
Metal Phone MIMO Antenna with Auxiliary Slot
Lee, Won-Hee ; Park, Minkil ; Son, Taeho ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 248~256
DOI : 10.5515/KJKIEES.2015.26.3.248
In this paper, a hybrid MIMO antenna for the metal phone with auxiliary slot for 4th generation mobile communication is designed and implemented. Auxiliary slot locates on the rear metal cover of the phone, and handles for LTE class 40 band. The auxiliary slot operates hybrid with a monopole antenna. Studied antenna satisfies under VSWR 3:1 for LTE class 13/ LTE class 14/ CDMA/ GSM/ DCS/ PCS/ W-CDMA/ LTE class 40 bands. ECC(Envelope Correlation Coefficient) value for MIMO characteristic is less than 0.2 over the whole design bands. Average gains and antenna efficiencies measured by MTG anechoic chamber were -5.57~-1.45 dBi and 27.75~71.6 %, respectively.
A Ultra-Wideband Two-Arm Self-Complementary Sinuous Antenna
Lee, Ho Sang ; Yoo, Tae Hoon ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 257~267
DOI : 10.5515/KJKIEES.2015.26.3.257
This paper presents a ultra-wideband sinuous antenna that operates in a whole frequency range (0.824~5.85 GHz) of Cellular/GSM-800, GSM900, ISM, GPS, DCS/GSM1800, PCS/GSM1900, WCDMA/UMTS/IMT2000, WiBro, WLAN and WiMax. The proposed antenna, which is composed of two sinuous arms, is designed as a self-complementary structure in order to have frequency-independent characteristics. It also uses a wideband balun of Klopfenstein taper structure to match to
. Experimental results show that the -10 dB return loss bandwidth of the proposed antenna is 5.24 GHz that ranges from 0.76 to 6 GHz, which covers all the frequency bands of the various wireless services. Within the entire operating frequency range, the measured radiation patterns in both E-plane and H-plane show nearly constant bidirectional broadside beams and the maximum antenna gain is measured to fall between 2.32~6.01 dBi.
An Efficient Design for an Ultra-Wideband Microstrip-to-CPS Transition Applicable to Millimeter-Wave Systems
Kim, Young-Gon ; Kim, Youn-Jin ; Kim, Kang Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 268~275
DOI : 10.5515/KJKIEES.2015.26.3.268
A clear and efficient design method for ultra-wideband microstrip-to-coplanar stripline(CPS) transition, which is based on the analytical expressions of the whole transitional structure, is presented. The conformal mapping is applied to obtain the characteristic impedance of the transitional structure within 3.2 % accuracy as compared with the EM-simulation results. The transition is designed to provide broadband impedance matching using Klopfenstein taper. The implemented transition performs less than 1 dB insertion loss per transition for frequencies from 5.39~40 GHz.
An Analysis of Wideband and High Efficiency Class-J Power Amplifier for Multiband RRH
Choi, Sang-Il ; Lee, Sang-Rok ; Rhee, Young-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 276~282
DOI : 10.5515/KJKIEES.2015.26.3.276
Until recently, power amplifiers using LDMOS were Class-AB and Doherty type, and showed 55 % efficiency for narrowband of 60 MHz bandwidth. However, owing to the RRH application of base stations power amplifier module, a bandwidth expansion of at least 100 MHz and high efficiency power amplifiers of at least 60 % power efficiency are required. In this study, a Class-J power amplifier was designed by optimizing an output matching circuit so that the second harmonic load will contain a pure reactance element only and have broadband characteristics by using GaN HEMT. The measurements showed that a 45 W Class-J power amplifier with a power added efficiency of 60~75 % was achieved when continuous wave signals were input at 1.6~2.3 GHz, including W-CDMA application.
Negative Impedance Converter IC for Non-Foster Matching
Park, Hongjong ; Lee, Sangho ; Park, Sunghwan ; Kwon, Youngwoo ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 283~291
DOI : 10.5515/KJKIEES.2015.26.3.283
In this paper, a negative impedance converter, the key element of non-Foster matching to enhance the bandwidth of matching high Q-factor passive element, is presented. Proposed negative impedance converter is implemented by the topology of Linvill's transistor negative impedance converter circuit. It is hard to forecast the operation of negative impedance circuit, because it is composed of gain element and positive feedback. Therefore the negative impedance circuit is implemented by hybrid type beforehand to check out the feasibility and it is designed by integrated circuit. The integrated circuit is fabricated by commercial
SiGe BiCMOS process, and non-Foster matching is observed at 700~960 MHz band by cancelling the target reactance.
Envelope Elimination and Restoration Transmitter for Efficiency and Linearity Improvement of Power Amplifier
Cho, Young-Kyun ; Kim, Changwan ; Park, Bong Hyuk ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 292~299
DOI : 10.5515/KJKIEES.2015.26.3.292
An envelope elimination and restoration transmitter that uses a tri-level envelope encoding scheme is presented for improving the efficiency and linearity of the system. The proposed structure amplifies the same magnitude signal regardless of the input peak-to-average power ratio and reduces the quantization noise by spreading out the noise to the out-of-band frequency, resulting in the enhancement of power efficiency. An improved linearity is also obtained by providing a new timing mismatch calibration technique between the envelope and phase signal. Implementation in a 130 nm CMOS process, transmitter measurements on a 20-MHz long-term evolution input signal show an error vector magnitude of 3.7 % and an adjacent channel leakage ratio of 37.5 dBc at 2.13 GHz carrier frequency.
Omnidirectionally Beam-Steerable Orthogonal Loop Resonator with Switch for Wireless Power Transfer
Choi, Bo-Hee ; Lee, Jeong-Hae ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 300~304
DOI : 10.5515/KJKIEES.2015.26.3.300
This paper presents an omnidirectionally beam-steerable orthogonal loop resonator for wireless power transfer. The resonator is composed of two orthogonal loops. These connections of two loops and the current direction on the loops are determined by the control of switch. The magnetic field direction is determined by the vector sum of each loop current. The beam is steerable to eight directions by four switch modes. Using the suitable switch mode, the simulation and measurement efficiencies in the whole azimuthal direction are 56.3~60.0 %(deviation 3.7 %) and 41.2~48.7 %(deviation 7.5 %), respectively. The results show a little variation of transmission efficiency in the azimuthal direction.
Spectrum Sensing System Design Using RF Front-End Processing
Hong, Jun Gi ; Han, Sang-Min ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 305~310
DOI : 10.5515/KJKIEES.2015.26.3.305
In this paper, a wireless spectrum sensing receiver system is proposed. While a conventional Cognitive Radio(CR) system utilizes frequency down-conversion and demodulation to recognize wireless spectral signal, the proposed one is able to recover and sense valid signal at an RF front-end. It has been designed with a super-regeneration type circuit with a channel selectivity and variability for FDM applications with which a conventional single-channel super-regeneration circuit could not provide. From experimental evaluation, the implemented system has been optimized for channel allocation with quenching signal, and verified for 5 MHz-channel spacing.
Design of Wideband Thin Absorber Using Resistive Cross-Shaped Surface Structures
Lee, Jun-Ho ; Kim, Gunyoung ; Lee, Bom-Son ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 311~316
DOI : 10.5515/KJKIEES.2015.26.3.311
This paper presents a design method for thin but wideband absorbers using resistive sheets. Its equivalent circuit consists of a series RLC resonant circuit and a short-terminated transmission line. Based on this equivalent circuit, we presented the three conditions for an electromagnetic absorber which has a thickness less than a quarter wavelength and wide absorption bandwidth at center frequency. By using an root-finding algorithm, the equivalent resistance, capacitance, and inductance of the absorbers are obtained. These equivalent circuit values for the absorber surface can be realized by a 2D periodic cross-shaped structure which has required surface resistance. Using the design method, we have designed the absorber which has 18.75 mm(
electrical length) thickness and 90 % absorption bandwidth of 116 % bandwidth at 3 GHz.
Adaptive Sidelobe Blanker for Interference Environment
Yang, Eunjung ; Han, Iltak ; Song, Junho ; Lee, Heeyoung ; Yeom, Dongjin ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 317~325
DOI : 10.5515/KJKIEES.2015.26.3.317
In an interference environment, adaptive sidelobe blanking(adaptive SLB: ASB) algorithm effectively cancels the high-duty cycle jammer and blocks the sidelobe signals without the auxiliary antenna. The adaptive SLB for the linearly constrained minimum variance (LCMV) is proposed in this paper. In the proposed scheme, the interference covariance matrix is modified to satisfy the direction constraints of LCMV and the normalized output can be obtained to block sidelobe signals. As the LCMV can be represented as a generalized sidelobe canceller(GSC) form, which is the general framework of various adaptive beamforming(ABF) algorithms, the proposed adaptive SLB can be applied to various ABF methods. The performance of the proposed method is verified through simulation and analysis.
Subcell Maxwell-Boltzmann FDTD Method for Analyzing Thin Plasma Layer
Jung, Inkyun ; Kim, Yuna ; Hong, Yongjun ; Yook, Jong-Gwan ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 326~332
DOI : 10.5515/KJKIEES.2015.26.3.326
Analyzing electromagnetic properties in plasma medium, it is difficult to numerically solve electromagnetic problem with thin plasma. In this paper, subcell Maxwell-Boltzmann FDTD method was proposed which is combined with Maxwell-Boltzmann FDTD and subcell FDTD method for analyzing plasma and electrically thin materials, respectively. Calculations of reflection coefficient and absorption rate error were performed by using 1D FDTD method. Reflection coefficient computed by applying the proposed method is in agreement with analytic solution. Absorption rate error analyzed by employing the proposed method is 1/10 times less than one by using conventional method.
Design and Fabrication of 0.5~4 GHz Low Phase Noise Frequency Synthesizer
Park, Beom-Jun ; Park, Dong-Chul ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 333~341
DOI : 10.5515/KJKIEES.2015.26.3.333
In this paper, a 0.5~4 GHz frequency synthesizer having good phase noise performance is proposed. Wideband output frequencies of the synthesizer were synthesized using DDS(Direct Digital Synthesizer) and analog direct frequency synthesis technology in order to obtain fast settling time. Also in order to get good phase noise performance, 2.4 GHz DDS clock was generated by VCO(Voltage Controlled Oscillator) which was locked by the 100 MHz reference oscillator using SPD(Sample Phase Detector). The phase noise performance of wideband frequency synthesizer was estimated and the results were compared with the measured ones. The measured phase noise of the frequency synthesizer was less then -121 dBc @ 100 kHz at 4 GHz.
Bubble-type Motion Detector Using a Pulsed-mode Oscillator and Delay Line
Lee, Ik-Hwan ; Kim, Dong-Wook ;
The Journal of Korean Institute of Electromagnetic Engineering and Science, volume 26, issue 3, 2015, Pages 342~348
DOI : 10.5515/KJKIEES.2015.26.3.342
This paper presents a new motion detector that has a bubble-layer detection zone using a pulsed-mode oscillator and delay line. The proposed motion detector controls the bubble-layer detection zone with pulse width of transmitted signals and creates IF signals only by reflected signals from the target within the detection zone whose position is determined by time delay of the delay line. The fabricated motion detector uses the pulsed-mode voltage controlled oscillator as a signal source which has a center frequency of 8 GHz, pulse width of 2 nsec and pulse period of 30 nsec. It successfully makes the bubble-layer detection zones at 1 m, 3 m and 5 m distant from itself using two delay lines with 7 nsec and 12 nsec delay, and is also demonstrated to detect the target within the detection zones.