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help understanding IRIS matching network physics

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yefj

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Hello ,i am trying to build a waveguide power divider shown bellow.
I am trying to use IRIS filtering for wide band matching .
my input is port 1 ,so port 2 and 3 are loads.
so basically the load from port 3 and port 2 are in parallel creating a general total load.

so now i need to create matching network to the load.

given these peaces of metal irises inside the waveguide,how to extract propely the LC model shown bellow.
i have a CST simulation tool.
is there some manual i can read with an example that shows how to convert the E-field and H-fields in the iris model into L-C structure shown bellow?
Thanks.

1654364208215.png


1654364257245.png
 

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