Hi, can you control my excitation on my structre?

hello,

my structure is shown in pich_1. (my structure is finished with 50 ohm in real world. i finished my structure with lump port which worths 50 ohm in the simulation. )
wave port is defined in pich_2.
wave port line is define in pich_3.
lump port is defined in pich_4.
lump port line is define in pich_5.
my structure is shown in pich_6.
my structure dimensions is in pich_7.

i simulated for 18 GHz.

but my result is not similar experimental result.

why isnt my result similar experimental result?

do i incorrectly define the ports?

can you define correctly the ports if i incorrect the ports?

may be my air definition is incorrect. but i dont know.

please i need to help.

thanks for your helps