Improvement of backscatter properties of C-shaped dipole scatterer for chipless RFID

The paper investigates performance properties of arrays of several different C-shaped folded dipole scatterers that are intended to be used as building units (coding particles) for spectral signature based chipless RFID tags. Frequency resolution and uniformity of radar cross section (RCS) response of single scatterers, its triplets and 10-element arrays are investigated. It is found that array of tapered-arms C shaped folded dipole scatterers provides significantly better uniformity of RCS response of the tag and better frequency resolution than the arrays of C-shaped folded dipoles with parallel arms however at the expense of RCS reduction.