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IWR1843: More details about IWR1843 antenna simulation

Part Number: IWR1843
Other Parts Discussed in Thread: IWR6843,

When I simulate IWR6843 antenna,I can not get the same result with TI.

TI simulation result is below:

My simulation model:waveport on RX2

My simulation is as below:

when Dk=3.45

When Dk=3.55

When Dk=3.66:

I want to know more details about TI simulation result,such as matching result,Dk setting and so on.

And why my simulation results are different from TI simulation results.

Thanks.