Accordion shape monofilar axial mode helix for RFID reader |
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| Authors: | Lau PY Wong H Yung EKN |
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| Affiliation: | Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China; |
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| Abstract: | An accordion shape monofilar axial mode helical antenna designed by curving the helix along the axis is proposed. This antenna achieves a low-profile characteristic as the 10-turn helix's axial length is 0.354/spl lambda/. The impedance bandwidth (SWR<1.5) is 9% from the frequency of 880 to 963 MHz and the axial ratio bandwidth (AR<3 dB) is 6.5%. The measured gain is 10.2 dBi. This antenna operated at the centre frequency of 915 MHz and has a tilted radiation of 17/spl deg/ to the curving side. |
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