Lecture7 - Lecture 7 Notes, 95.658, Spring 2012,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 7 Notes, 95.658, Spring 2012, Electromagnetic Theory II Dr. Christopher S. Baird, UMass Lowell 1. Far-Field Dipole Radiation Review- Using the Green's function solution for radiation, we applied it to a localized source.- To find the far-field behavior of the waves, we then expanded the exponential and kept only the first term, which led to: A x ,t = 4 e i k r t r J x ' e i k r ' x x ' d x '- We further expanded the source into multipoles and found that electric dipole radiation in the far field is: A ( x ,t )= i 4 p e i ( k r t ) r where p = x ' (( x ' )) d x ' which leads to the fields: B = ck 2 p 4 ( k p ) e i ( k r t ) r E = c 2 k 2 p 4 k ( k p ) e i ( k r t ) r- The unit vector in the propagation direction used here must not be confused with the unit vector in the z direction, although they are labeled the same....
View Full Document

Page1 / 3

Lecture7 - Lecture 7 Notes, 95.658, Spring 2012,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online