Lecture 18 Linear Antenna Arrays

# Lecture 18 Linear Antenna Arrays - Lecture Lecture18...

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cture 8 Lecture 18 Linear Antenna Arrays ayt H 14 Hayt CH 14 1 McGill ECSE 352, Fall 2011, D. Davis

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rrays Arrays e basic principle of antenna arrays (a The basic principle of antenna arrays, (a radiating system that has more than one lement {antenna}) is that the far field element {antenna}), is that the far field behavior of an antenna can be described as a nction of the physical placement and the function of the physical placement and the radiating characteristics of the component lements elements. McGill ECSE 352, Fall 2011, D. Davis 2
rrays Arrays ntenna arrays are typically used to create a Antenna arrays are typically used to create a specific far field pattern. is ehavior is constructed in the following This behavior is constructed in the following manner. In the case of far fields we can make e assumption that the observer is the assumption that the observer is sufficiently far away so that the paths from e antennas to the observer are the antennas to the observer are approximately parallel. McGill ECSE 352, Fall 2011, D. Davis 3

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rrays Arrays r Field Problem Far Field Problem McGill ECSE 352, Fall 2011, D. Davis 4
rrays Arrays the figures above if we assume that the two In the figures above if we assume that the two identical antennas lie on the x axis and are parated by a distance “ ” In this case we separated by a distance d . In this case we can write that . he lectric field at the ar field) observer ܴ 2 ؆ܴ 1 െ݀ݏ݅݊׎ The electric field at the (far field) observer can then be written as : ݁ െ݆ߚܴ 1 Ψ Ψ ܧൌܧ ݋ ܨሺ׎, ߠሻ ܴ 1 ݁ 2 ൤ܿ݋ݏ ൬ 2 ൰൨ Ψൌߚ݀ݏ݅݊ߠܿ݋ݏ׎ McGill ECSE 352, Fall 2011, D. Davis 5

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rrays Arrays There are a few factors that will affect the behavior of the array that have not been focused on in the text.
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Lecture 18 Linear Antenna Arrays - Lecture Lecture18...

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