Tuneable Electromagnetic Bandgap structures based on Ba/sub 0.25/Sr/sub 0.75/TiO/sub 3/ parallel-plate varactors on silicon Coplanar Waveguides
Paper i proceeding, 2003

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 Ba/sub 0.25/Sr/sub 0.75/TiO/sub 3/ 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

ferroelectric devices

barium compounds

ferroelectric materials

microwave propagation


ferroelectric thin films

strontium compounds

coplanar waveguides




Dan Kuylenstierna

Institutionen för mikroelektronik och nanovetenskap

Andrei Vorobiev

Institutionen för mikroelektronik och nanovetenskap

G. Subramanyam

Spartak Gevorgian

Institutionen för mikroelektronik och nanovetenskap

33rd European Microwave Conference Proceedings, 7-9 Oct. 2003

Vol. Vol.3 1111-14


Elektroteknik och elektronik