Ferroelectric (FE) Barium Strontium Titanate (Ba (1-x) Sr x TiO 3 , BST) thin film varactor technology is applied to the antenna miniaturization and reconfiguration successfully. CPW square-ring slot antenna is used as a design example, and antennas with and without integrated BST varactors were fabricated and characterized. Including the total ground, the size of miniaturized antenna is 0.12λ 0 ×0.12λ 0 which is reduced by 31% compared with antenna without the BST varactors. Moreover, the frequency of the miniaturized antenna with the BST varactors is reconfigurable from 5.8GHz to 6.1GHz with a low DC biasing voltage of 3V. Both E-plane and H-plane patterns were measured for the antennas. Fabrication details and measurement setup are also presented.Index Terms -Ferroelectric, thin film, antenna miniaturization, reconfigurable antenna, coplanar waveguide (CPW), ring slot antenna, varactor loading, high permittivity material.
A novel printed antenna with a frequency reconfigurable feed network is presented. The antenna consists of a bowtie structure patch radiating element in the inner space of an annulus that is on a nongrounded substrate with a ferroelectric (FE) Barium Strontium Titanate (BST) thin film. The bowtie patch is fed by a coplanar waveguide (CPW) transmission line that also includes a CPW-based BST shunt varactor. Reconfiguration of the compact 8 mm × 8 mm system has been demonstrated by shifting the antenna system’s operating frequency 500 MHz in the 7–9 GHz band by applying a DC voltage bias.
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