Title :
Tuneable Electromagnetic Bandgap structures based on Ba0.25Sr0.75TiO3 parallel-plate varactors on silicon Coplanar Waveguides
Author :
Kuylenstierna, D. ; Vorobiev, A. ; Subramanyam, G. ; Gevorgian, S.
Author_Institution :
Dept. of Microelectron., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
Experimental performance of Electromagnetic Band Gap (EBG) structures, based on Coplanar Waveguides (CPW) periodically loaded by high-Q-factor ferroelectric varactors is reported. The varactors are made of Ba0.25Sr0.75TiO3 films grown by laser ablation on thick Pt/Au/Pt electrodes. Due to the thick bottom electrodes the varactors have Q-factor larger than 40 at 45 GHz, which is higher in comparison with semiconductor varactors. Up to 30% tuning of the pass band edge is achieved at -20 dB level under 25V DC bias.
Keywords :
Q-factor; barium compounds; coplanar waveguides; ferroelectric devices; ferroelectric materials; ferroelectric thin films; microwave propagation; silicon; strontium compounds; varactors; 25 V; 45 GHz; Ba0.25Sr0.75TiO3; Ba0.25Sr0.75TiO3 film parallel-plate varactors; Pt-Au-Pt; Pt/Au/Pt electrodes; Si; high-Q-factor ferroelectric varactors; laser ablation; pass band edge tuning; silicon coplanar waveguides; thick bottom electrodes; tuneable electromagnetic bandgap structures; Coplanar waveguides; Electrodes; Electromagnetic waveguides; Laser tuning; Loaded waveguides; Metamaterials; Periodic structures; Tunable circuits and devices; Varactors; Waveguide discontinuities;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262849
