FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1754441468> ?p ?o ?g. }

• W1754441468 abstract "The main focus of this thesis is the analysis of the interactions between antennas and channels where electromagnetic fields play a central role. Our goal has been to devise a general framework to enable a clear separation of the properties of the propagation channel from the influence of the antennas at the same time as it provides a common ground for a joint characterization of their properties. For this we have taken help of two tools: 1) a solution to Maxwell's equations, i.e., a spherical vector wave (svw) multi-modal expansion of the electromagnetic field and 2) the scattering matrix representation of an antenna that provides a full description of all its properties as a transmitting, receiving or scattering device. These tools offer a natural characterization of the polarizational, directional, and spatial properties of multiple-input multiple-output (MIMO) antenna systems. In this thesis we first show that under some assumptions the propagation channel and the antenna are equivalent. The equivalence is in the sense that the impact of the channel cross-polarization ratio (XPR) and the antenna effective cross-polarization discrimination (XPD) on the mean effective gain (MEG) of an antenna are symmetrical. We also find bounds on the MEG in a wireless channel. Then we provide closed form expressions for the covariance of the field multi-modes as a function of the Power Angle Spectrum (PAS) and the channel XPR. A new interpretation of the MEG of antennas in terms of field multi-modes is also provided where the maximum MEG is obtained by conjugate mode matching between the antennas and the channel. We also show the (intuitive) result that the optimum decorrelation of the antenna signals is obtained by the excitation of orthogonal spherical vector wave modes. The cross-correlation coefficient between signals at two antenna branches (ports) in the presence of spatially selective interference and additive white gaussian noise is also investigated showing that spatial interference can also be readily modeled in terms of the svw mode expansion. We further devise a correlation model for co- and cross-polarized field components and introduce the concept of mode-to-mode channel mapping, the M-matrix, between the receive and transmit antenna modes. The M-matrix maps the modes excited by the transmitting antenna to the modes exciting the receive antennas and vice versa. The covariance statistics of this M-matrix are expressed as a function of the double-directional power-angular spectrum (PAS) of co- and cross-polarized components of the electromagnetic field. We finally derive physical limitations on the interactions of antennas exciting TM or TE modes (but not both) and wireless propagation channels. Rather than maximizing antenna gain in a single direction we obtain physical limitations on the antenna gain pattern, which is directly translated to more condensed parameters, i.e. the instantaneous effective gain Gi and the mean effective gain Ge if instantaneous realizations or correlation statistics of the expansion coefficients of the electromagnetic field are known, respectively. The obtained limitations are on the maximum of Gi/Q and Ge/Q, which establish a trade-off between link gain and the antenna quality factor Q. (Less)" @default.
• W1754441468 created "2016-06-24" @default.
• W1754441468 creator A5087362849 @default.
• W1754441468 date "2009-01-01" @default.
• W1754441468 modified "2023-09-25" @default.
• W1754441468 title "On the Antenna-Channel Interactions: A Spherical Vector Wave Expansion Approach" @default.
• W1754441468 hasPublicationYear "2009" @default.
• W1754441468 type Work @default.
• W1754441468 sameAs 1754441468 @default.
• W1754441468 citedByCount "13" @default.
• W1754441468 countsByYear W17544414682012 @default.
• W1754441468 countsByYear W17544414682013 @default.
• W1754441468 crossrefType "dissertation" @default.
• W1754441468 hasAuthorship W1754441468A5087362849 @default.
• W1754441468 hasConcept C114614502 @default.
• W1754441468 hasConcept C120665830 @default.
• W1754441468 hasConcept C121332964 @default.
• W1754441468 hasConcept C127162648 @default.
• W1754441468 hasConcept C127413603 @default.
• W1754441468 hasConcept C147789679 @default.
• W1754441468 hasConcept C151764478 @default.
• W1754441468 hasConcept C184720557 @default.
• W1754441468 hasConcept C185592680 @default.
• W1754441468 hasConcept C205049153 @default.
• W1754441468 hasConcept C207987634 @default.
• W1754441468 hasConcept C21822782 @default.
• W1754441468 hasConcept C24326235 @default.
• W1754441468 hasConcept C24890656 @default.
• W1754441468 hasConcept C33923547 @default.
• W1754441468 hasConcept C41008148 @default.
• W1754441468 hasConcept C64671776 @default.
• W1754441468 hasConcept C76155785 @default.
• W1754441468 hasConceptScore W1754441468C114614502 @default.
• W1754441468 hasConceptScore W1754441468C120665830 @default.
• W1754441468 hasConceptScore W1754441468C121332964 @default.
• W1754441468 hasConceptScore W1754441468C127162648 @default.
• W1754441468 hasConceptScore W1754441468C127413603 @default.
• W1754441468 hasConceptScore W1754441468C147789679 @default.
• W1754441468 hasConceptScore W1754441468C151764478 @default.
• W1754441468 hasConceptScore W1754441468C184720557 @default.
• W1754441468 hasConceptScore W1754441468C185592680 @default.
• W1754441468 hasConceptScore W1754441468C205049153 @default.
• W1754441468 hasConceptScore W1754441468C207987634 @default.
• W1754441468 hasConceptScore W1754441468C21822782 @default.
• W1754441468 hasConceptScore W1754441468C24326235 @default.
• W1754441468 hasConceptScore W1754441468C24890656 @default.
• W1754441468 hasConceptScore W1754441468C33923547 @default.
• W1754441468 hasConceptScore W1754441468C41008148 @default.
• W1754441468 hasConceptScore W1754441468C64671776 @default.
• W1754441468 hasConceptScore W1754441468C76155785 @default.
• W1754441468 hasLocation W17544414681 @default.
• W1754441468 hasOpenAccess W1754441468 @default.
• W1754441468 hasPrimaryLocation W17544414681 @default.
• W1754441468 hasRelatedWork W1555722984 @default.
• W1754441468 hasRelatedWork W2000721829 @default.
• W1754441468 hasRelatedWork W2071105494 @default.
• W1754441468 hasRelatedWork W2091014343 @default.
• W1754441468 hasRelatedWork W2099495572 @default.
• W1754441468 hasRelatedWork W2103183123 @default.
• W1754441468 hasRelatedWork W2130509920 @default.
• W1754441468 hasRelatedWork W2770482646 @default.
• W1754441468 hasRelatedWork W2800729154 @default.
• W1754441468 hasRelatedWork W2897952532 @default.
• W1754441468 hasRelatedWork W2914721156 @default.
• W1754441468 hasRelatedWork W2921813779 @default.
• W1754441468 hasRelatedWork W2972722311 @default.
• W1754441468 hasRelatedWork W3041979159 @default.
• W1754441468 hasRelatedWork W3091112279 @default.
• W1754441468 hasRelatedWork W3120779472 @default.
• W1754441468 hasRelatedWork W3197599238 @default.
• W1754441468 hasRelatedWork W2830202751 @default.
• W1754441468 hasRelatedWork W2840338251 @default.
• W1754441468 hasRelatedWork W2929385251 @default.
• W1754441468 isParatext "false" @default.
• W1754441468 isRetracted "false" @default.
• W1754441468 magId "1754441468" @default.
• W1754441468 workType "dissertation" @default.