| CPC H01Q 1/273 (2013.01) [H01Q 1/245 (2013.01); H01Q 1/44 (2013.01)] | 17 Claims |

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1. An antenna structure for a body-worn device, the antenna structure comprising:
one or more antennas configured to radiate at least one radio signal;
a conductive band capacitively coupled to the one or more antennas and that comprises a director or reflector for the one or more antennas, wherein the conductive band is configured to:
detachably couple to a body of a user; and
backscatter the at least one radio signal when the conductive band is coupled to the body; and
a switch to toggle activation of the director or reflector,
wherein structures of the one or more antennas and the conductive band are tuned to each other according to one or more performance characteristics of the antenna structure,
wherein the structure of the conductive band comprises a length, a width, and a thickness of the conductive band, and
wherein tuning the structure of the conductive band according to the one or more performance characteristics comprises tuning at least the length, the width, or the thickness of the conductive band to shield an absorption effect of the body on the at least one radio signal radiated from the one or more antennas.
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