Novel miniature RF Filter fabricated on ferroelectric substrate

Period of Performance: 07/08/2003 - 01/14/2004


Phase 1 SBIR

Recipient Firm

Dymas Research, Inc.
22 Pond View Dr.
Plainsboro, NJ 08536
Principal Investigator


Recently, expanding wireless, cellular and other mobile communication systems have presented new challenges to design and produce high quality miniature filters with low cost. Currently the RF filter is by far the largest element in some subsystems of wireless communications. Dymas Research proposes a novel RF filter fabricated on dielectric substrate covered by low loss thick BST film on its both sides. The dielectric constant of BST film are very high, therefore we can design the RF filter in a smaller size. Dymas Research proposes to fabricate novel miniature RF filters on high quality low-loss thick Ba0.5Sr0.5TiO3(BST) film on a LaAlO3 substrate. The configuration of planar circuit filter will be used to design the proposed filter. Planar circuit filter have the advantages of small size, lightweight, low cost, and compatible to monolithic substrate technology. Ferroelectric /dielectric/ferroelectric structure substrate also provide electric tunability for adaptive microwave devices. This tunable microwave device has the advantage of achieving frequency or phase tunability. Success in the Phase I effort will lead to the commercial fabrication of new generation of tunable miniature RF filters. This advanced device will offer the potential for significant performance improvements in military and commercial applications. The development of a materials technology that reduces effective loss tangent is expected to benefit all electrically tunable microwave devices that could utilize low insertion loss or high quality factor.