Tunable filter arrangement comprising resonators with reflection layers

US6583688B2 · 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: Jun 24, 2003
• Expiry date: Apr 5, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H9/562
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

The invention describes a tunable filter arrangement with a plurality of resonators which are coupled to one another and of which there is at least one which comprises a piezoelectric component made of a ferroelectric material and to which a DC voltage source is connected. The application of a DC voltage to the resonator renders it possible to change its electrical properties and thus the overall filter characteristic. Furthermore, a transmitter, a receiver device, and a mobile telephone device with such a filter arrangement are disclosed, aswell as a tunable bulk acoustic wave resonator.