BST thin film capacitors integrated within a frequency tunable antenna
Résumé
Ferroelectric (FE) thin film varactors can be a
convenient technology for tuning miniature antennas. In this
paper we present the design of a compact, agile, wire patch
antenna integrating barium strontium titanate (Ba(1-x)SrxTiO3,
BST) thin film interdigitated capacitors (IDC). The IDCs
values were measured at different temperatures and bias
voltages ranging from 0 to 120 V showing a capacitance
variation of more than 40% between 11-13 GHz and up to
28% in the 2-3 GHz frequency interval. Their integration
within a compact antenna design allows tuning its operating
frequency on the whole WiFi band, with efficiencies higher
than 70%.