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Elektronik ve Haberleşme Mühendisliği Bölümü

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Browsing Elektronik ve Haberleşme Mühendisliği Bölümü by Subject "Beam Profile"

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    Citation - WoS: 10
    Citation - Scopus: 11
    Generalized Beams in Abcdgh Systems
    (Elsevier Science Bv, 2007) Eyyuboglu, Halil Tanyer; Baykal, Yahya
    For a generalized beam at the source plane passing through co-located aperture and a propagation path consisting of an off-axis x-y asymmetric ABCDGH system, the receiver plane irradiance expression is derived using the Collins integral. A collection of source beam profiles that are obtainable from the generalized. beam formulation are illustrated. Plots are given for viewing the progress of selected generalized beam types along the propagation axis, containing a single thin lens, co-centric and misaligned in the x-direction. The received power failing onto a finite aperture surface is calculated for various misalignment situations. (c) 2006 Elsevier B.V. All rights reserved.
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    Article
    Citation - WoS: 19
    Citation - Scopus: 19
    Off-Axis Beam Intensity in Random Medium
    (Elsevier Science Bv, 2007) Baykal, Yahya; Eyyuboglu, Halil T.
    The receiver intensity profile of an off-axis-Gaussian beam travelling in random medium is formulated. By examining the related exponential terms of this intensity expression, the rules governing the receiver plane displacements are deduced. Off-axis-Gaussian beam is characterized by introducing into a Gaussian beam, complex displacement parameters that exhibit transverse source coordinate dependent attenuation and phase shifts. Our results are applied to turbulent horizontal links. Intensity plots describing the dependence on the source and propagation parameters both on the source and the receiver planes are provided. Even though the normalized intensities of the off-axis-Gaussian beam having the same source sizes but differing displacements in x- and y-directions may look the same on the source plane, they will differentiate after propagation. The views from the progress of an off-axis-Gaussian beam along the turbulent link length show that a source displaced beam will act according to rules set by related exponential terms. An asymmetrical (ellipsoidal) off-axis-Gaussian beam will initially be converted into symmetric (circular) shape at the intermediate link lengths, then it will start to expand in the other direction, thus reverting to an ellipsoid shape whose major axis is now along the transverse coordinate opposite to that of the source plane. (c) 2006 Elsevier B.V. All rights reserved.