Castro-Vilaró, Amada M.

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Tunable folded-slot antenna with thin film ferroelectric material Ferroelectric material
(2003) Castro-Vilaró, Amada M.; Rodríguez-Solís, Rafael A.; College of Engineering; Colom, José; Fernández, Félix; Department of Electrical and Computer Engineering; Orama, Lionel
In this work, the modeled performance of gold (Au)/ Ba0.60Sr0.40TiO3 (BSTO) ferroelectric/ magnesium oxide (MgO) two-layered tunable coplanar waveguide (CPW) fed folded–slot antenna (FSA) is presented. BSTO materials have electric field dependent dielectric properties. Upon application of electric fields the dielectric constant can be tuned over a wide frequency range. The Finite Difference Time Domain (FDTD) method is applied to analyze the output responses. The return loss, input impedance and elevation patterns of the CPW-fed FSA design are included. The designed antenna structure is operational at Ka-band, matched at 50 ohms with minimum reflections and tunable bandwidth of 7.10 GHz for 23.33% around 30.47 GHz. A total frequency shift of 4 GHz and input resistance shift of 28.54 ohms are obtained. The gain is approximately 2.98 dBi. This thesis research demonstrates another advantageous application for ferroelectric thin-films for enhancing the performance of a CPW-fed FSA designed for Ka-band frequencies.