How should I define Constant Propagation(K) in Lossy(not lossless) DNG or ENG Media?

1-How should i define Constant Propagation(K) in Lossy(not lossless) DNG or ENG Media?

2-I need some sources that implement and realize Spherical bessel function with negative complex argument!!!!


Thanx

Dear Good_Bad_boy

take a look I hope it will help you.

pl

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THREE DIMENSIONAL VOLUMETRIC DNG METAMATERIALS
http://media.wiley.com/product_data/...0471761028.pdf