A study on the improvement of antenna diversity considering analyses of mutual coupling and MIMO channel상호 결합 특성 및 MIMO 채널 분석을 고려한 안테나 다이버시티 향상에 관한 연구

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MIMO communications system for future applications gradually requires more capacity for the informational contents extension and qualitative improvement. The performance degradation of mobile and wireless systems in a multipath propagation environment, called signal fading phenomenon, can be handled successfully with spatial, polarization, pattern or another diversity schemes. In communications systems, most theories deal with point source analysis for isotropic radiations or simple linear antenna array for co-polarization transmitting and receiving, even analyze two-dimensional models. But, we need to consider the three-dimensional models for realistic multiple scattering environments and also deal with environmental factors which are vertical and horizontal polarization propagation characteristics with cross polarization discriminations (XPD) for realistic multipath channel environments. Thereby, many researches are achieved for exact channel analysis and efforts to expand channels or improve communications performance. Dipoles or monopoles for linear antennas are frequently used for analyzing the antenna diversity. The polarization diversity was principally developed using orthogonal linear antennas by vertically polarized mobiles with XPDs of incident fields. And even experiments using spatial, polarization and pattern diversity were conducted by using dipoles. Two vertically polarized dipoles or monopoles on the ground are frequently demonstrated with mutual coupling effects with variation of spatial separation between antennas for antenna diversity. True polarization diversity (TPD) is proposed to achieve a high diversity gain by inclined dipole array to receive various polarized waves by multipath fading channel. The analysis of an antenna mutual coupling is a significant issue for designing the wireless communication system especially related to the antenna diversity problem. The accurate analysis of the mutual coupling between antennas is certainly n...
Advisors
Myung, Noh-Hoonresearcher명로훈
Description
한국과학기술원 : 전기및전자공학과,
Publisher
한국과학기술원
Issue Date
2014
Identifier
591839/325007  / 020115315
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 전기및전자공학과, 2014.8, [ xi,104 p ]

Keywords

안테나 다이버시티; 다이폴; 상호 결합; 상관도; 다중입출력; dipole; antenna diversity; MIMO; mutual coupling; correlation

URI
http://hdl.handle.net/10203/196606
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=591839&flag=dissertation
Appears in Collection
EE-Theses_Ph.D.(박사논문)
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