A method for calculating the resonant frequency of meander line dipole antenna by using antenna's geometrical parameters

This paper presents the method for calculating the resonant frequency of Meander Line Dipole Antenna (MLDA) in the UHF frequency range. Two types of meander line antennas have been designed for passive RFID tag antennas. The design, analysis and characterization of the two proposed antennas are performed using simulation software FEKO. Two methods have been proposed to calculate the resonant frequency of a meander line dipole antenna by calculating its inductance. One method proposed by T. Endo and another method has been proposed in this paper and the proposed method contributes 90% as closely as desired. For example in MLDA-2 antenna the resonant frequency are 1.16 GHz and 1.01 GHz calculated by T. Endo and proposed method respectively when the no. of meander is 8. According to this method the resonant frequency and other antenna characteristics mainly depend upon the number of meander line, horizontal and vertical length, the separation of the twist arms, wire radius, total physical length and wire length of the antenna structure. The capacitance and inductance are introduced after squeezing the dipole antenna. The capacitance and inductance of the antenna are also a function of the antenna's shape and dimension. The resonant characteristics have been found by calculating their inductances and compared to the result from simulation software FEKO. The result showed a good agreement with the simulation.