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You can check these content for help.

[URL unfurl="true"]https://www.ittc.ku.edu/~jstiles/723/handouts/Analysis%20and%20Design%20of%20Coupled%20Line%20Couplers.pdf[/URL]

[URL unfurl="true"]https://www.microwaves101.com/encyclopedias/even-and-odd-mode-impedances[/URL]

[URL unfurl="true"]https://eng.libretexts.org/Bookshelves/Electrical_Engineering/Electronics/Microwave_and_RF_Design_II_-_Transmission_Lines_(Steer)/05%3A_Coupled_Lines_and_Applications[/URL]