Impedance of slotted waveguide antenna

Hi all,
I'm making a 6 slots radiating on a rectangular WG at X-band. I've defined all dimensions and it started to resonate well. But I'm not well understanding why the slot radiate properly when the slots are off the centerline and at this specific displacement? this might bring me back to define the reactance of of the WG ? I've read in some papers that slots are seen as shunt admittance along transmission line and this confused me ? I know the slots are strongly interrupting the surface currents and its why it radiates so the logical thinking says its an impedance not admittance.

can any one address this confusion
Thank you in advance

I read that impedance of slot can be found in simulation by putting reference plane of port in slot center.
http://www.radartutorial.eu/06.anten...ntenna.en.html (something on displacement of slot from center line)
I would move slot around in simulation and look at S-parameters. I have no answer for your second question.

Thank you for the hint. I will try putting reference. According my understanding, the displacement from the center is required to keep the slots radiating in phase and the pattern stay symmetrical.

For the try error methods, I know it works at the end but I need to know the distributed impedance throughout the waveguide by ohms law definition.



Regards,