feeding antenna with TEM modes logic probem

Thread Starter

yef smith

Joined Aug 2, 2020
348
Hello there are antennas like stripline fed or coaxial fed antennas in which the input mode is TEM.
but then i thought ,how can TEM be the input of an antenna if TEM in a NON propogating mode?
Thanks.
 

nsaspook

Joined Aug 27, 2009
9,754
Hello there are antennas like stripline fed or coaxial fed antennas in which the input mode is TEM.
but then i thought ,how can TEM be the input of an antenna if TEM in a NON propagating mode?
Thanks.
It is propagating into space as radiation.
https://interferencetechnology.com/antenna-fundamentals/

1648314745431.png
Figure 3. (a) Electric field E and (b) magnetic field H and TEM field from dipole charge and current

1648314810159.png
Figure 4. Power flow resulting in radiation.
 
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