Re: help reg.attenuation
Hi, Venkat:
From the near field, you are supposed to be able to find the current distribution along a TLN or you can direclty use the single moded horizontal near field (E or H). Assume you get Ja, Jb, and Jc at 3 uniformly spaced coordinates in the longitudinal direction with the distance between Ja and Jb to be h. For a TLN
J = Inc * exp( - gamma * z ) - Ref * exp( gamma * z )
You can represent (Ja+Jc)/Jb as a function of (gamma*h). Since Ja, Jb, Jc and h are known, you can solve gamma=alpha+j*beta from it. I am not sure whether such a formula is documented anywhere. I found the relationship when I was a student and I documented it in my Ph.D. thesis (Univ. of Colorado at Boulder 1990). Regards.