Title :
Accordion shape monofilar axial mode helix for RFID reader
Author :
Lau, P.Y. ; Wong, H. ; Yung, E.K.N.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, Kowloon, China
fDate :
5/25/2006 12:00:00 AM
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.
Keywords :
antenna radiation patterns; helical antennas; radiofrequency identification; 880 to 963 MHz; RFID reader; accordion shape monofilar axial mode helix; helical antenna;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20060398
