In this communication a new RFID chipless tag is presented. The density of coding per surface of this novel tag is important and reaches 3.3 bits/cm2. For a surface of 1:5 x 2 cm2, it is possible to encode 10 bits. The design presented in this paper, based on multiband coplanar strip, brings enhancement in term of miniaturization, con¯gurability and cost of fabrication. Unlike previous solution only one layer of metal is necessary. So, such a tag could be easily printed with conductive inks. Both frequency domain measurement using a VNA and Time domain measurement based on radar approach are compared.