I have a finite array of unit cells, completely backed with PEC. When I try to illuminate it with incident plane wave, I get strong scattered waves from the PEC, apart from scattering at desired directions. But the PEC at the back of the metasurface is supposed to block transmission of the incident wave. Still I get strong far field scattering.
I used both open boundary and FE-BI boundaries for the whole metasurface array for this this purpose with no positive results.
Kindly help me.
The total field is the sum of the incident field and the scattered field. The incident field would have continued past place where the PEC layer is. When the PEC is in the way there is no field there, it is is in shadow. Part of the scattered field is the field that cancels the incident field to give zero or lower field in the shadow. For this reason there is scattered field behind PEC.
The polar diagram of the forward scattering looks very much similar to reflection from a flat PEC plate, which is what is needed to produce a full shadow (except opposite phase).
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Waves