This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Notes 10 Spring 2005.doc Polarization According to the IEEE Standard Definitions for antennas the polarization of a radiated wave is defined as “That property of a radiated electromagnetic wave describing the timevarying direction and relative magnitude of the electric field vector; specifically, the figure traced as a function of time by the extremity of the vector at a fixed location in space, and the sense in which it is traced, as observed along the direction of propagation.” We showed before for the field represented in free space by ( ) ( z k t cos E x ˆ t , z x − ω ) = E G that at a particular choice of z the electric field vector varies in a straight line. Therefore, we can say that this electric field is a linearly polarized uniform plane wave. In phasor form this field is . z jk x e E x ˆ E − = G We can write a more general phasor form which will encompass two additional polarization types: ( ) ( ) ( ) b o a z k t cos b y ˆ z k t cos a x ˆ t , z φ + ± ω + φ + ± ω = E G ( ) ( b a z k j z k j be y ˆ ae x ˆ E φ + ± φ + ± + = G ) where a and b are the amplitudes for each direction and...
View
Full
Document
This note was uploaded on 01/20/2012 for the course EE 4460 taught by Professor Czarnecki during the Fall '10 term at LSU.
 Fall '10
 Czarnecki
 Electromagnet

Click to edit the document details