What's refractive index of common materials such as concrete in the low frequency range of 5G like 3.7 GHz?

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Ramy M. Abdallah

@Farah The answer is in Table 5 of this thesis: https://trace.tennessee.edu/cgi/viewcontent.cgi?article=1493&context=utk_graddiss. Then convert the dielectric const to refractive index using https://www.tf.uni-kiel.de/matwis/amat/elmat_en/kap_3/backbone/r3_7_1.html#_4

Khalid Ali Khan

As you asked, the refractive index of concrete material? Basically, in this case, refractive Index also depends upon volume mass fraction of the concrete until and unless it is not linear.