Phantom models representative of skin, fat and muscle layers have been fabricated, in order to simulate the tissue properties at 868 MHz. The compositions of the fabricated phantoms are listed in Table IV. In order to realize a threelayer phantom, the fabrication of a gel-mimicking phantom is necessary. For this purpose, 10 g of gelatine is also added into 100 ml of de-ionized water for the skin and muscle phantoms.