2.4 GHz Circularly Polarized Microstrip Antenna for RFID Application

摘要

Due to deployment of the wireless technology, the microstrip antenna can be used for RFID application especially for tag antenna. The existed RFID tag antenna usually use dipole model to get the maximum performance. However, the dipole antenna which has linear polarization performance has disadvantages on alignment that makes data detection on RFID can not be accurate. To reduce error during data detection caused of misalignment between reader and transponder, the tag antenna should have circularly polarized performance. The antenna was made with microstrip-line fed on FR-4 Epoxy substrate and works covers 2.4 GHz of its frequency range of 2 up to 3.3 GHz which S-parameter level below -9.54 dB and the direction of the transmitted power omnidirectionally and has circular polarization at frequency range of 2.39 until 2.46 GHz which has axial ratio below 3 dB.