Title :
Optimization of uniplanar multilayer structures using nonlinear tunable dielectrics
Author :
Giere, Andre ; Scheele, Patrick ; Damm, Christian ; Jakoby, Rolf
Author_Institution :
Inst. fur Hochfrequenztechnik, Technische Univ. Darmstadt, Germany
Abstract :
For an optimization of the tunability of coplanar waveguides (CPW) different geometries have been studied on barium-strontium-titanate (BST) thick films. The presented measurement results show a strong dependency of tunability vs. geometry which can not be calculated using standard conformal mapping (CM) approaches. To calculate a cross section of a CPW, an FDTD (finite difference time domain) algorithm, expanded to field strength dependent relative permittivities has been implemented. A geometry efficiency factor χ is introduced to review the effective tunability for different geometries.
Keywords :
barium compounds; coplanar waveguides; dielectric waveguides; finite difference time-domain analysis; multilayers; permittivity; strontium compounds; thick film devices; BST thick films; Ba0.6Sr0.4TiO3; FDTD algorithm; barium-strontium-titanate thick films; coplanar waveguides; finite difference time domain algorithm; geometry efficiency factor; nonlinear tunable dielectrics; relative permittivity; uniplanar multilayer structures; Binary search trees; Conformal mapping; Coplanar waveguides; Dielectric measurements; Finite difference methods; Geometry; Nonhomogeneous media; Permittivity measurement; Thick films; Time domain analysis;
Conference_Titel :
Microwave Conference, 2005 European
Print_ISBN :
2-9600551-2-8
DOI :
10.1109/EUMC.2005.1608918
