Tunable Filters based on Ferroelectrics and Semiconductor Varactors
Doctoral thesis, 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.

High Temperature Superconductor (HTS)

quality factor

tunable filter

phase transition

circular disc resonator

Cu/BCB multilayer

KTaO3

ferroelectrics

dual mode filter

SrTiO3

Author

Anders Eriksson

Chalmers, Microtechnology and Nanoscience (MC2)

Other publications Research

Subject Categories

Electrical Engineering, Electronic Engineering, Information Engineering

ISBN

92-7291-585-4

Doktorsavhandlingar vid Chalmers tekniska högskola. Ny serie: 2267

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

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8/13/2021

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