FDTD problems for help.

I have some problems in FDTD to get help.First thank you for your reading.

1. Zin(w)=V(w)/I(w), how to locate the contour of H for I(t)? Take a dipole as an example. The contour should be around the feed gap or around the arm?
2. When we calculate a strip dipole (thickness=0), a contour for I(t) is also needed.Should I include the H components along the direction of thickness?
3.If PML is used,should a certain distance between the antenna and the PML be left as that of Mur ABC?
Thank you for your answers!

you can refer to book sadiku about FDTD.

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About the 3rd item, a minimum distance of one wavelenght (10 cells) should be considered between your antenna and the PML, that differs from MUR, that is about 200 cells aprox...

I really don′t like MUR. PML is good, but take a look at UPML. It has a simpler formulation, and 60db attenuation similar to PML, using 10 layers os ABC and 10 cells of distance (minimum) between your structure and ABC.

I really agree with you,and thank you very much for your help.

Added after 18 minutes:

Thank you for your help.