In this paper, a dual band planar inverted F antenna (PIFA) has been investigated\nfor cooperative on- and off-body communications. Free space and on-body performance\nparameters like return loss, bandwidth, radiation pattern and efficiency of this antenna are\nshown and investigated. The on- and off-body radio propagation channel performance at\n2.45 GHz and 1.9 GHz have been investigated, respectively. Experimental investigations are\nperformed both in the anechoic chamber and in an indoor environment. The path loss exponent\nhas been extracted for both on- and off-body radio propagation scenarios. For on-body\npropagation, the path loss exponent is 2.48 and 2.22 in the anechoic chamber and indoor\nenvironment, respectively. The path loss exponent is 1.27 for off-body radio propagation\nsituation. For on-body case, the path loss has been characterized for ten different locations\non the body at 2.45 GHz, whereas for off-body case radio channel studies are performed for\nfive different locations at 1.9 GHz. The proposed antenna shows a good on- and off-body\nradio channel performance.
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