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Analysis and Design of Meander Line Dipole Antennas
Abstract
A simple analytic formula, found in the literature for calculating the resonant frequency of a meander line dipole antenna (MDA) in free space from its physical parameters is described. The formula is modified to calculate the resonant frequency of an MDA on a dielectric substrate and for use as an RFID tag antenna by taking two factors into account: (i) the effects of dielectric material underneath the MDA, (ii) the special needs of an impedance matching condition in RFID tag antenna design. The parameter of relative effective permittivity for an MDA on a dielectric board, and the method for deriving this parameter, are introduced. Experiments to verify the modified formula are reported. Test results such as input impedance and reading range of an RFID tag antenna design based on an MDA on a dielectric board are provided. Following that, the radiation pattern and efficiency of an MDA either in free space or on a board are investigated.
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