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The paper describes the application of the lumped element equivalent circuit approach to the modeling of a capacitively loaded circularly-polarized microstrip patch antenna. This is achieved by using vector fitting to fit frequency domain scattering parameter data properly to a rational function approximation. Then, the parameter coefficients from the approximate function are used to calculate the passive elements of the lumped equivalent circuit. The circular polarization is achieved by a combination of lumped capacitor loading at the ends of the antenna and feeding along either diagonal of the patch to produce left-hand or right-hand circular polarization. This technique is intended to give a designer an idea of the value of capacitance needed to achieve circular polarization and to facilitate the optimization process. The method is benchmarked for antennas for Bluetooth applications.
Antennas and Propagation Society International Symposium, 2004. IEEE (Volume:4 )
Date of Conference: 20-25 June 2004