BST thin film capacitors integrated within a frequency tunable antenna

Rammal Mohamad (1) , Laure Huitema (1) , Aurelian Crunteanu (2) , Damien Passerieux (3) , Dominique Cros (2) , Thierry Monédière (1) , Perrine Dutheil (4) , Valérie Madrangeas (2) , Corinne Champeaux (4) , Pascal Marchet (5) , Frédéric Dumas-Bouchiat (4) , Liviu Nedelcu (6) , Lucian Trupina (6) , Gabriel Banciu (6) , Marin Cernea (6)

1 XLIM-SRF - Systèmes RF
2 XLIM-RFEI - RF-ELITE : RF-Electronique Imprimée pour les Télécommunications et l'Energie
3 XLIM - XLIM
4 Axe 2 : procédés de traitements de surface
5 SPCTS-AXE3 - Axe 3 : organisation structurale multiéchelle des matériaux
6 National Institute for Materials Physics - NIMP (ROMANIA)

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%.

Mots clés: Ferroelectric thin films (FE); BST (Barium Strontium Titanate); IDC capacitors; reconfigurable antennas.

Domaines: Electromagnétisme; Matériaux; Micro et nanotechnologies/Microélectronique

Rammal Mohamad, Laure Huitema, Aurelian Crunteanu, Damien Passerieux, Dominique Cros, et al.. BST thin film capacitors integrated within a frequency tunable antenna. International Workshop on Antenna Technology (iWAT) 2016, Feb 2016, Hilton Cocoa Beach Oceanfront, FL, U.S.A., United States. ⟨hal-01274357⟩