ACCORDION HELICAL ANTENNA—WITH TILTED DIRECTIONAL RADIATION FOR RFID

摘要

In this paper, an innovative design of accordion helical antenna is presented. This antenna has a new feature of circularly polarization with tilted directional radiation that can be operated in the radio frequency of 860MHz to 930MHz. It achieves a comparable low profile characteristic with the traditional helical antenna as the pitch angle of helix is reduced from the optimum 12° to 2°. The half power beamwidth is around 45°-65° when bending angle is increased from 5° to 30° with 10 turns. The antenna has potential application in RFID systems.