Compact wideband single-layer RFID tag antenna tolerant on mounting objects

In this work, a low profile single-layer radio frequency identification (RFID) tag antenna is described, which is mountable on both metallic and non-metallic structures with different permittivity characteristics. The proposed antenna is an unsymmetrical dipole antenna, capacitively fed by a loop for conjugate matching. The 3 dB power bandwidth of the antenna is around 140MHz when mounted on the log, while it is 35MHz when it is mounted on the metal.