So true. BUT, measuring the coupling coefficient is the big issue. Please check
en
.tudes are sines and cosines of almost unit strength, so that if you drive o ne side only, the power will shift almost 100% to the other side, then back again sinusoidally.
Oh directional couplers! Now there's something I've never understood so well. The ones I sorta get are the waveguide with three ports and artfully chosen slots connecting top and bottom.
This type of thing
So you can do similar tricks with coupled transmission lines?
George H.
Sure. One ham version uses a piece of coax with a bit of insulated wire sneaked in just inside the shield. Transmitted power comes out one end, reflected power comes out the other. It needs to be fairly long, of course.
Ordinary VSWR bridges work on a different principle, namely the phase relationship between the voltage and current in the line.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
Those are all approximate formulas, so yes, simplifying assumptions are used.
It shouldn't be that hard to do a full vector EM simulation--it's a 2D problem just like a mode solver.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal Consultant
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