Diplexer for the Ground Station: https://www.everythingrf.com/products/microwave-rf-diplexers/networks-international-corporation/69-334-s-band-cavity-diplexer

Explanation of Diplexers vs Duplexers

https://resources.pcb.cadence.com/blog/2023-diplexers-vs-duplexers

Notes on Diplexing vs Duplexing:

Diplexing is when you separate signals based on frequency

Duplexing is when you separate signals based on direction

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Hence T/R and T/R that goes into Splitter/Coupler into Diplexer into TX and RX of the COTS Transmitter for no dual patch

the other option is the two patches which would be too directional (put some numbers behind this) what % of orientations maybe a Coby thing.