Symmetric dual mode surface acoustic wave filter having symmetric housing connections

US6791437B2 · kind B2 · utility

Assignee

• EPCOS AG · DE

Inventors

• Peter Hagn · Finsing, DE
• Peter Selmeier · Haag in Oberbayern, DE

Key dates

• Filing date: Feb 25, 2003
• Grant date: Sep 14, 2004
• Expiry date: Mar 26, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H9/14588
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A DMS filter is proposed with first and second interdigital transducers as a signal input or output that are located between reflector structures, wherein at least one acoustic track has a middle transducer that is split into partial transducers symmetric with respect to the perpendicular to the direction of propagation. The DMS filter is connected in a symmetrical manner to a housing using connection pads or connection pins in order to produce an axis-symmetrical connection layout.