Antenna Efficiency Calculations for Electrically Small, RFID Antennas

Author

Galehdar, Amir ; Thiel, David V. ; O´Keefe, Steven G.

Author_Institution

Centre for Wireless Monitoring & Applications, Griffith Univ., Nathan, Qld.

Volume

6

fYear

2007

fDate

6/29/1905 12:00:00 AM

Firstpage

156

Lastpage

159

Abstract

Radio frequency identification (RFID) antenna efficiency is an important component of link budget design. A method of moments technique based on the summation of segment currents compares favorably with two different results obtained using the finite element method (radiation pattern integration and Wheeler cap). The efficiency of a resonant dipole was found to be proportional to the inverse square root of the conductivity. For a typical RFID meander line antenna in free space the relationship is more severe

Keywords

antenna radiation patterns; antenna theory; finite element analysis; method of moments; radio links; radiofrequency identification; RFID antennas; Wheeler cap; electrically small antennas; finite element method; link budget design; method of moments technique; radiation pattern integration; radio frequency identification; resonant dipole; Antenna accessories; Backscatter; Conductivity; Dipole antennas; Finite element methods; Frequency; Moment methods; National electric code; Radiofrequency identification; Wire; Antenna efficiency; Wheeler cap; numerical electromagnetic code (NEC); radio frequency identification (RFID); wire antennas;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2007.891960

Filename

4154653