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subtKK_nPt_re_0th.m 2017-05-05 3.0 kB
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readme.txt 2017-02-17 1.1 kB
frec_N.txt 2016-06-02 500.0 kB
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Closed form expressions of the Kramers-Kronig and of the multiply subtractive Kramers-Kronig relations. 

The expressions require only the evaluation of basic arithmetic operations and logarithms, therefore the models are fast enough to be advantageously included in engineering software. The expressions are general, they can be applied not only to material parameter extraction but for other areas as well (e.g. signal integrity), which involves any complex function that is analytic in the upper half-plane or signals generated by systems with causal impulse response. 

The subtractive Kramers-Kronig relation can successfully assist to retrieve the effective refractive index of metamaterials even when the Kramers-Kronig relation fails.

The details can be found in:

Zs. Szabó, "Closed Form Kramers-Kronig Relations to Extract the Refractive Index of Metamaterials," in IEEE Transactions on Microwave Theory and Techniques , vol.PP, no.99, pp.1-10
doi: 10.1109/TMTT.2016.2633345
URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=7811260&isnumber=4359079
Source: readme.txt, updated 2017-02-17