Differential Port and Matching in CST

I am doing simulation in CST schematic and microwave studio.

I have designed two loops antennas and connect them to Balun and Matching circuits.

However, the MWSCHEM block is not connected to the second output of Balun

My question, is how to connect the second output of Balun to MWSCEH block, shall this be connected to a ground directly?

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