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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
Editor in Chief :
Volume & Issues
Volume 14, Issue 4 - Dec 2014
Volume 14, Issue 3 - Sep 2014
Volume 14, Issue 2 - Jun 2014
Volume 14, Issue 1 - Mar 2014
Selecting the target year
CMOS Linear Power Amplifier with Envelope Tracking Operation (Invited Paper)
Park, Byungjoon ; Kim, Jooseung ; Cho, Yunsung ; Jin, Sangsu ; Kang, Daehyun ; Kim, Bumman ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 1~8
DOI : 10.5515/JKIEES.2014.14.1.1
A differential-cascode CMOS power amplifier (PA) with a supply modulator for envelope tracking (ET) has been implemented by 0.18
RF CMOS technology. The loss at the output is minimized by implementing the output transformer on a FR-4 printed circuit board (PCB). The CMOS PA utilizes the
harmonic short at the input to enhance the linearity. The measurement was done by the 10MHz bandwidth 16QAM 6.88 dB peak-to-average power ratio long-term evolution (LTE) signal at 1.85 GHz. The ET operation of the CMOS PA with the supply modulator enhances the power-added efficiency (PAE) by 2.5, to 10% over the stand-alone CMOS PA for the LTE signal. The ET PA achieves a PAE of 36.5% and an
of -32.7 dBc at an average output power of 27 dBm.
Resonant Characteristics of Triple-Mode Dielectric Resonators
Myung, Jae-Yoon ; Yun, Sang-Won ; Park, Namshin ; Lee, Donyong ; Kim, Byungchul ; Won, Jeonghee ; Na, Inho ; Jang, Geonho ; Wang, Xu-Guang ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 9~14
DOI : 10.5515/JKIEES.2014.14.1.9
This paper discusses the resonant characteristics, such as the resonant frequencies and Q factors, as well as tuning methods of the resonant frequency of the triple-mode dielectric resonators, for their possible application to compact bandpass filters for mobile communication systems. The resonators include spheres and cylindrical rods that can be applied to compact bandpass filters. These high Q ceramic resonators can replace the conventional coaxial type resonators, which are large sized and also have relatively low Q values. Both simulated and measured results show that the Q values of the sphere and rod reach 27,000 and 24,000, respectively. Decoupling of degenerate modes is also briefly discussed.
Compact Dual-Band Three-Way Metamaterial Power-Divider with a Hybrid CRLH Phase-Shift Line
Jang, Kyeongnam ; Kahng, Sungtek ; Jeon, Jinsu ; Wu, Qun ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 15~24
DOI : 10.5515/JKIEES.2014.14.1.15
A compact dual-band three-way metamaterial power divider is proposed that has three in-phase outputs. Fully printed composite rightand left-handed (CRLH) unequal and equal power dividers are first implemented for 900-MHz and 2.4-GHz bands with the power-division ratios of 2:1 and 1:1, respectively. An initial 1:1:1 power divider is then achieved by incorporating the input of the two-way equal block into an output of the unequal block, and trimming the interconnection parameters. The condition of an identical phase at the three outputs of the power divider is then met by devising a hybrid CRLH phase-shift line to compensate for the different phase errors at the two frequencies. This scheme is confirmed by predicting the performance of the power divider with circuit analysis and full-wave simulation and measuring the fabricated prototype. They results show agreement; the in-phase outputs as well as the desirable power-division are accomplished and outdo the conventional techniques.
Rectifier Design Using Distributed Greinacher Voltage Multiplier for High Frequency Wireless Power Transmission
Park, Joonwoo ; Kim, Youngsub ; Yoon, Young Joong ; So, Joonho ; Shin, Jinwoo ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 25~30
DOI : 10.5515/JKIEES.2014.14.1.25
This paper discusses the design of a high frequency Greinacher voltage multiplier as rectifier; it has a greater conversion efficiency and higher output direct current (DC) voltage at high power compared to a simple halfwave rectifier. Multiple diodes in the Greinacher voltage multiplier with distributed circuits consume excited power to the rectifier equally, thereby increasing the overall power capacity of the rectifier system. The proposed rectifiers are a Greinacher voltage doubler and a Greinacher voltage quadrupler, which consist of only diodes and distributed circuits for high frequency applications. For each rectifier, the RF-to-DC conversion efficiency and output DC voltage for each input power and load resistance are analyzed for the maximum conversion efficiency. The input power with maximum conversion efficiency of the designed Greinacher voltage doubler and quadrupler is 3 and 7 dB higher, respectively;than that of the halfwave rectifier.
Multiband-Notched UWB Antenna Using Folded Slots in the Feeding Structure
Ta, Son Xuat ; Park, Ikmo ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 31~35
DOI : 10.5515/JKIEES.2014.14.1.31
An ultra-wideband (UWB) circular monopole antenna with a multiband-notched characteristic is proposed. The multiband-notched filter consists of three different sized folded slots, which are distinctly assigned for the notched band at the 3.5-GHz WiMAX, 5-GHz WLAN, and 8-GHz ITU bands. The proposed antenna results in a measured
< -10 dB, which completely covers the UWB band (3.1 10.6 GHz) with three notched bands at 3.5, 5.5, and 8.0 GHz. The antenna yields an omnidirectional radiation pattern and high radiation efficiency.
A Novel Epsilon Near Zero Tunneling Circuit Using Double-Ridge Rectangular Waveguide
Kim, Byung-Mun ; Son, Hyeok-Woo ; Hong, Jae-Pyo ; Cho, Young-Ki ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 36~42
DOI : 10.5515/JKIEES.2014.14.1.36
In this paper, an epsilon near zero (ENZ) tunneling circuit using a double-ridge rectangular waveguide (RWG) is proposed for the miniaturization of a waveguide component. The proposed ENZ channel and is located in the middle of the input-output RWG (IORWG). The ratio of the height to the width of the channel waveguide is very small compared to the IORWG. By properly adjusting the ridge dimensions, the tunneling frequency of the proposed ENZ channel can be lowered to near the cut-off frequency of the IORWG. For the proposed ENZ tunneling circuit, the approach adopted for extracting the effective permittivity, effective permeability;normalized effective wave impedance, and propagation constant from the simulated scattering parameters was explained. The extracted parameters verified that the proposed channel is an ENZ channel and electromagnetic energy is tunneling through the channel. Simulation and measurement results of the fabricated ENZ channel structure agreed.
PCB-Embedded Antenna for 80 GHz Chip-to-Chip Communication
Chung, Jae-Young ; Hong, Wonbin ; Baek, Kwang-Hyun ; Lee, Young-Ju ;
Journal of electromagnetic engineering and science, volume 14, issue 1, 2014, Pages 43~45
DOI : 10.5515/JKIEES.2014.14.1.43
We propose a printed circuit board (PCB)-embedded antenna for millimeter-wave chip-to-chip communication. The antenna is 0.18 mm in height which is 1/20 wavelength at 80 GHz. In order to realize such a low profile, a zeroth-order resonator antenna with a periodic array of four unit cells is employed, and its geometry is optimized to cover an 8-GHz bandwidth from 76 to 84 GHz. With this;the antenna is capable of radiating in a direction parallel to the board length despite the short distance between the ground and the radiator. Simulation and measurement results show that the optimized design has low reflection coefficients and consistent radiation patterns throughout the target bandwidth.