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CPW-fed to CPS Dipole Antenna of Microstrip Tapered Balun with Triangular Loop Director
Hyeonjin Lee 대한전기학회 2014 Journal of Electrical Engineering & Technology Vol.9 No.4
A CPW-fed to CPS dipole antenna of triangular loop director by microstrip tapered balun is proposed for dual and wide band operations, in this paper. The proposed antenna is consisted of a CPW-fed to CPS transform, microstrip tapered balun element, CPS dipole driver and triangular loop director. A dual and wide bandwidth of the proposed dipole antenna is realized by introducing the triangular loop director and taper matching element. The operated frequency bandwidth is 1GHz (2.14~3.14 GHz) and 1.9 GHz (4.6~6.5 GHz) to return loss criterion of less than 10 dB. The measured return loss of the proposed antenna showed good results of the dual and wide band operating frequency and the radiation pattern. The proposed antenna is able to support WLAN wireless communications applications.
CPW-fed to CPS Dipole Antenna of Microstrip Tapered Balun with Triangular Loop Director
Lee, Hyeonjin The Korean Institute of Electrical Engineers 2014 Journal of Electrical Engineering & Technology Vol.9 No.4
A CPW-fed to CPS dipole antenna of triangular loop director by microstrip tapered balun is proposed for dual and wide band operations, in this paper. The proposed antenna is consisted of a CPW-fed to CPS transform, microstrip tapered balun element, CPS dipole driver and triangular loop director. A dual and wide bandwidth of the proposed dipole antenna is realized by introducing the triangular loop director and taper matching element. The operated frequency bandwidth is 1GHz (2.14~3.14 GHz) and 1.9 GHz (4.6~6.5 GHz) to return loss criterion of less than 10 dB. The measured return loss of the proposed antenna showed good results of the dual and wide band operating frequency and the radiation pattern. The proposed antenna is able to support WLAN wireless communications applications.
Lee, Haemi,Lee, Yoo Jeong,Choi, Hyeonjin,Ko, Eun Hee,Kim, Jae-Woo American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.16
<P>Growth-arrested 3T3-L1 preadipocytes rapidly express CCAAT/enhancer-binding protein-beta (C/EBPbeta) upon hormonal induction of differentiation. However, the DNA binding activity of C/EBPbeta is not activated until the cells synchronously reenter S phase during the mitotic clonal expansion (MCE) phase of differentiation. In this period, C/EBPbeta is sequentially phosphorylated by MAPK and glycogen synthase kinase-3beta, inducing C/EBPbeta DNA binding activity and transcription of its target genes. Because the DNA binding activity of C/EBPbeta is further enhanced by oxidation in vitro, we investigated how redox state affects C/EBPbeta DNA binding and MCE during adipogenesis. When 3T3-L1 cells were treated with H(2)O(2) and hormonal stimuli, differentiation was accelerated with increased expression of peroxisome proliferator-activated receptor gamma. Interestingly, cell cycle progression (S to G(2)/M phase) was markedly enhanced by H(2)O(2), whereas antioxidants caused an S phase arrest during the MCE. H(2)O(2) treatment resulted in the early appearance of a punctate pattern observed by immunofluorescent staining of C/EBPbeta, which is a hallmark for C/EBPbeta binding to regulatory elements, whereas a short antioxidant treatment rapidly dispersed the centromeric localization of C/EBPbeta. Consistently, reactive oxygen species production was increased during 3T3-L1 differentiation. Our results indicate that redox-induced C/EBPbeta DNA binding activity, along with the dual phosphorylation of C/EBPbeta, is required for the MCE and terminal differentiation of adipocytes.</P>
A Pair Dipole Antenna with Double Tapered Microstrip Balun for Wireless Communications
Lee, Hyeonjin The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.3
In this paper a printed pair dipole antenna with double tapered microstrip balun for wireless communications is proposed. The proposed antenna consists of a pair arm of different sizes that is branched microstrip line and microstrip line with the ground plane on opposite side of the dielectric substrate plane. The proposed antenna is matched between the ground plane to the microstrip line by double tapered microstrip balun. This antenna obtains multi-band radiation frequency band. The impedance bandwidths for a reflection coefficient of VSWR ≤ 2 are about 1.01 GHz (2.35~3.336 GHz), 1.56 GHz (4.7~6.26 GHz) and 1.15GHz (6.85~8.0[GHz]). Additionally, the measurement peak gain is about 3.6 dBi. The proposed antenna is able to support wireless communication applications.
Dual Dipole Antenna for WLAN Communication
Hyeonjin lee,Inho Cho,Gangseok Cho,Yeongseog Lim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
A compact printed dual dipole antenna is proposed for WLAN and DSRC operations with CPW-fed. The proposed antenna, which consists of two dipole strips, has modified dual monopole and modified strips by the ground plane. The proposed antenna has been obtained good radiation characteristics. This antenna is effectively covered 5 ㎓ (5.15?5.825 ㎓) bands. The measured peak gain is 2.8 ㏈i at 5.32 ㎓. Effects of varying the monopole dimensions and the ground-plane size on the antenna performance have been studied.
Design and fabrication of the circularly polarized microstrip patch antenna
Hyeonjin, Lee,Jung, Jinwoo,Yeongseog, Lim Wiley Subscription Services, Inc., A Wiley Company 2007 MICROWAVE AND OPTICAL TECHNOLOGY LETTERS Vol.49 No.6
<P>In this article, circularly polarized microstrip patch antenna with a 5.8 GHz frequency for the Industrial Scientific Medical is designed and fabricated. The proposed modified cross-slots antenna composed four separate slots by removing the intersection of the cross-slot in conventional structure. The proposed antenna improved characteristics of the gain, radiation pattern, and impedance bandwidth than the conventional cross-slots antenna. As a result, the proposed antenna obtains impedance bandwidth of 240 MHz (VSWR < 1.5) and maximal gain of 5 dBi. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1415–1418, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22441</P>
Design of Printed Multi-band Double Dipole Antenna for Wireless Communication Applications
( Hyeonjin Lee ),( Chae Og Park ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.1
This paper intends to propose a printed multi-band monopole antenna for wireless local area network(WLAN). The proposed antenna is consisted of the two difference size alternated branches by modified monopole and alternated strips and tapered matching with modified ground plane. The proposed antenna has a low profile and can easily be fed by microstrip line. Prototypes of the proposed antenna designed for WLAN operations in 2.4, 5 GHz bands have been designed and tested. The proposed antenna was obtained good radiation characteristics. The simulated bandwidth for VSWR≤ 2 is 0.98 GHz (2.1~3.08), 1.74 GHz 93.98 ~ 5.72) 1.18 GHz (6.6 ~7.78). The simulation peak gain is 2.8 dBi at 5.45 GHz.