Low profile normal mode helix antenna

Recently, many industries are interested in UHF RFID tags. Half-wavelength film-type dipole antennas are currently used because thin, small-sized designs are required as such tag antennas. However, these antennas should not be used near metallic structures or liquids. Another area of demand is the use of RFID tags for very small items. Thus, antennas of very small dimensions and the possibility of their use near metal structures must be realized.