1. A helix antenna structure comprising: multilayered printed circuit board comprising; a plurality of printed circuit board layers, each printed circuit board layer comprising a peripheral loop antenna, a plurality of connection bridges, each connection bridge connecting two peripheral loop antennas, wherein the multilayered printed circuit board is foldable; and wherein a selected one of the printed circuit board layers is configured to physically and electrically accommodate a transmitter inside the peripheral loop antenna of the selected printed circuit board layer, the selected printed circuit board layer comprising a first antenna feeding line, the first antenna feeding line splitting off from the peripheral loop antenna of the selected printed circuit board layer and configured to be electrically connected to a first output terminal of the transmitter; and an antenna extension, said antenna extension electrically connected to a last peripheral loop antenna and axially extending away from the plurality of printed circuit board layers.
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