The basic difference between Open and Open add space boundary conditions in CST

[ravi8331]

Hii
Anyopne tell me what is the basic difference between Open and Open add space boundary conditions in CST Microwave Studio???

When i use open boundary condition then i m getting different result in comaprison to Open add space boundary condition.

i don't understand why such things happen n what is the basic problem within that??

plz reply..............

 

[mauloftin]

CST boundary problem

Hi,

in the help is:

Open (PML): Operates like free space: waves can pass this boundary with minimal reflections. Note that in case of a unit cell simulation with the general purpose frequency domain solver open boundaries are realized by a Floquet port.



Open (add space): Same as Open (PML), but adds some extra space for farfield calculation. This option is recommended for antenna problems.