About dipoles and current/voltage nodes
Yes I should know this.. However an issue has come up in my place of
work I am trying to get my head around. On a 10GHz microwave TX there is
a stripline parallel to the output track that is suppose to detect
forward power. Nothing strange about that. What is weird is that it
appears to be roughly a half wave length (or more).
The question is this. If one hangs a 1/2 wave dipole in free space I
assume it receives such that current maximums are at the centre and
voltage maxiums at the ends. Is this the case whether a feedline is
connected or not?
If I then take a stripline cct terminated at one end with a 50r resistor
and a detect diode at the other and is a half wave long, what is the
current/voltage distribution in this configuration.
What I wonder is if it is a halfwave there may be no voltage at the
detect diode input. (It could be 3/4 wavelength when one factors in pcb
dielectric and end loading)
Thoughts?
Cheers Bob VK2YQA
|