Article below is a part of the assembly process of the UHF duplexer – main article is HERE.
Drawing below shows a [AL100] – Coupling Loop Bar TX (R).
Main purpose of the part is to make a copper loop which engages the signal inside of the cavity. Loop is made of 1mm thick and 4mm wide copper. Also I decided to extend the loop inside of the chamber and get both ends to work as capacitor – so no need to use any external capacitor 🙂
Please note the RX coupling loops are slightly different!