Title :
Tuneable Electromagnetic Bandgap Structures Based on Ba0.25Sr0.75Ti03 Parallel-Plate Varactors on Silicon Coplanar Waveguides
Author :
Kuylenstierna, D. ; Vorobiev, A. ; Subramanyam, G. ; Gevorgian, S.
Author_Institution :
Department of Microelectronics, Chalmers University of Technology, 412 96 Gothenburg, Sweden, e-mail: dan@ep.chalmers.se
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 Ba0.25Sr0.75Ti03 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 :
Coplanar waveguides; Electrodes; Electromagnetic waveguides; Laser tuning; Loaded waveguides; Metamaterials; Periodic structures; Silicon; Tunable circuits and devices; Varactors;
Conference_Titel :
Microwave Conference, 2003 33rd European
Conference_Location :
Munich, Germany
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMA.2003.341102
