Laird Technologies – S9028PCL12NF – 902-928MHz 9 dBi, LH Circular Polarization Patch Antenna, 12 coax, N-Female, RFID. UHF CIRCULARLY POLARIZED RFID ANTENNASUnless an RFID tag is located very close to a reader antenna, it is usually necessary to use circularly polarized (CP) reader antennas. In most RFID applications the orientation of the tags is random with respect to the reader antenna. Since tags are linearly polarized they would need to be exactly aligned (co-polarized) with a linearly polarized reader antenna for reading to take place successfully. Circularly polarized antennas doRead More