Tunable piezoelectric filter arrangement using a dielectric material with a voltage-dependent dielectric constant

US6653913B2 · kind B2 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Mareike Klee · Straelen, DE
• Robert F. Milsom · Redhill, GB
• Hans-Peter Löbl · Monschau, DE
• Rainer Kiewitt · Roetgen, DE
• Uwe Mackens · Aachen, DE
• Martinus Hermanus Wilhelmus Maria Van Delden · Eindhoven, NL
• Wilhelm Hermann · Roetgen, DE
• Olaf Wunnicke · Eindhoven, NL

Key dates

• Filing date: Apr 5, 2001
• Grant date: Nov 25, 2003
• Expiry date: Apr 5, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H9/566
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

The invention describes a tunable filter arrangement with at least two resonators which are coupled to one another and of which at least one is connected to a capacitor with tunable capacitance. The electrical properties of the resonator, and thus the overall filter characteristic, can be changed through a change in the capacitance of the capacitor. Furthermore, a transmitter, a receiver, a mobile telephone device, and a wireless data transmission system comprising such a filter arrangement are disclosed, as is a tunable bulk acoustic wave resonator.