Planar filter with ferroelectric and/or antiferroelectric elements

US6049726A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Gruenwald · Gerlingen, DE
• Christian Neumann · Hungen, DE
• Matthias Klauda · Erlangen, DE

Key dates

• Filing date: May 21, 1997
• Grant date: Apr 11, 2000
• Expiry date: May 21, 2017

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01P1/20363
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

An electrically tunable planar filter has a filter element including a substrate having an upper side and a wave-guide arranged on the upper side of the substrate, at least one tuning element composed of at least one material selected from the group consisting of a ferroelectric material and an antiferroelectric material with adjustable voltage applied to the tuning element and thereby with an adjustable dielectric constant, the tuning element being arranged at the upper side of the substrate.