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The complex permittivity and a high loss will highly attenuate any "radiated" power. You can start with a salty-water "tissue phantom" to see the results.
As well as a tissue, salty water has the permittivity of ~ 80, so your antenna size will have to be reduced by a square root of it, or, ~9 times. In air, at 30 GHz, the wavelength is 10 mm, so your antenna will be ~1.1 mm long.
BTW, how can you generate a 30GHz signal in the tissue?