What is the difference between different types of microstrip coupled lines show in figure attached?
What type of coupling mechanism involved in between coupled lines shown in figure attached?
I see a pair of coupled lines (maybe striplines maybe microstrip) and this is the basic configuration for a directional coupler where the directivity comes from the fact that there is electric AND magnetic coupling the index oo stands for odd mode (delta)) and oe for even mode (sum mode).The difference between left and right is the way how the coupled signal is taken out (upstream or downstream)
One of these is a filter. The other is a coupler. It could be a hybrid coupler.
See
zaki and Ishii, Synthesis of a Class of Strip-Line Filters, IRE Trans. Circuit Theory, June 1958, for an explanation of the filter section.
Alternatively,
Wenzel, Design of TEM Networks using Quarter-Wave lines, IEEE Trans. Microwave Theory Tech., Jan 1964.
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