Tunable Filters based on Ferroelectrics and Semiconductor Varactors
Doktorsavhandling, 2005

Experimental investigation and development of tunable microwave filters, based on single crystals of SrTiO3 (STO) and KTaO3 (KTO), form the main work of this thesis. The dielectric properties of STO and KTO crystals are evaluated experimentally for a wide temperature range, with a DC bias, using parallel-plate resonators with High Temperature Superconductor (HTS) and normal metal (Cu) electrodes. An electrodynamic model of tunable parallel-plate resonators is investigated and used to design multi-pole tunable band-pass filters for applications in microwave mobile communication systems.



phase transition

dual mode filter

Cu/BCB multilayer

tunable filter

quality factor

circular disc resonator

High Temperature Superconductor (HTS)



Anders Eriksson

Chalmers, Mikroteknologi och nanovetenskap (MC2)


Elektroteknik och elektronik



Technical report MC2 - Department of Microtechnology and Nanoscience, Chalmers University of Technology: 17

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 2267