Question about ABC in self-written FDTD - code

Hi all,

I've written a simple 2D FDTD code using really simple ABC. In the absorber region the E-Field is damped as follows:

,
where α is a damping constant defining the strength of the absorber.

Does anybody of you know if this type of absorber (which does not work well for angles smaller than 40 degrees) has a specific name?

Thanks in advance,
aalemann

*push*

maybe this absorber is too simple to have a specific name...?

Hello ,

If you look at my group's website there are some notes on FDTD. Within those notes you will find a section on Perfectly Matched Layers (PML). They are quite effective .
http://emlab.utep.edu/index.htm
Go under the resources tab.

Cesar

thanks for posting the link to your notes, but my question was not about how to improve my simple "non"-radiating boundary, I just wanted to know if the method as I posted it above has a separate name.

aalemann, you misunderstand the concept of ABC and PML, ABC has no thickness, it is only a boundary condition. predicting the outside field using 1st order, 2nd order ......... approximations.

PML has a thickness, its formulation theoretically claim that all angle can be perfectly absorbed. And it has a thickness (Layer). Which will make the E and H field decay as it propagate deeper into the layer. Which is what you wrote in your first post.