Derivation for ABCD matrix of backward-wave directional couplers

How to derive the ABCD matrix for the following backward-wave directional couplers ?

Note: I could not locate Table 2.2 in the book

Simply they specify even and odd mode characteristics.
However they treat phase velocity is same for even and odd.
That?s all.

Learn basic things surely.

Wait, how do you arrive at this conclusion ?

It is a definition itself.

Can you understand basic equation for transmission line ?
Four physical ports are expressed by four logical ports regarding even and odd modes.

Learn basic things surely.

BTW, can you understand https://www.edaboard.com/showthread.php?384394 ?

Phase velocity of even and odd mode is same for TEM mode in homogeneous and isotropic medium.