0.8 GHz to 2.4 GHz Tunable Ceramic Microwave Bandpass Filters

A 200% tuning range of advanced integrated piezoelectric LTCC bandpass filters is presented. The filter incorporates a novel parallel-plate capacitor that can be tuned by a piezoelectrically movable electrode. In this prototype, the fabrication process is modified for better controlling the air-gap inside the capacitor. To our knowledge, the potential recorded tuning range from 0.8 GHz to 2.4 GHz is the highest continuous range that ever reported in bandpass filters.

[1]  Walter H. W. Tuttlebee.  Software-defined radio: facets of a developing technology , 1999, IEEE Wirel. Commun..

[2]  M. Bakri-Kassem,et al.  An improved design for parallel plate MEMS variable capacitors , 2004, 2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535).

[3]  R. Jakoby,et al.  Nonlinear dielectrics for tunable microwave components , 2004, 15th International Conference on Microwaves, Radar and Wireless Communications (IEEE Cat. No.04EX824).

[4]  Norazan Mohd. Kassim,et al.  Analytical modeling for determination of pull-in voltage for an electrostatic actuated MEMS cantilever beam , 2002, ICONIP '02. Proceedings of the 9th International Conference on Neural Information Processing. Computational Intelligence for the E-Age (IEEE Cat. No.02EX575).

[5]  R. Maenner,et al.  Wide piezoelectric tuning of ltcc bandpass filters , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[6]  K. Kageyama,et al.  Tunable active filters having multilayer structure using LTCC , 2001, IMS 2001.

[7]  A. Mortazawi,et al.  Voltage-controlled RF filters employing thin-film barium-strontium-titanate tunable capacitors , 2003 .