Flexible surface acoustic wave device

• US 7,369,014 B1
• Filed: 05/12/2005
• Issued: 05/06/2008
• Est. Priority Date: 05/12/2004
• Status: Expired due to Fees

• Current Assignee: Joseph C. Fehsenfeld
• Original Assignee: Joseph C. Fehsenfeld
• Inventors: Fehsenfeld, Joseph C., Miller, Greg N., Andle, Jeffrey C.
• Primary Examiner(s): Summons; Barbara
• Application Number:
  US11/129,054
• Time in Patent Office: 1,090 Days
• Field of Search: 333/193, 235/444, 310/313.R
• US Class Current: 333/193
• CPC Class Codes: H01Q 1/2225 used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
• CPC Class Codes: H01Q 7/00 Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
• CPC Class Codes: H03H 9/02574 of combined substrates, multilayered substrates, piezoelectrical layers on not-piezoelectrical substrate
• CPC Class Codes: H03H 9/173 Air-gaps
• CPC Class Codes: H03H 9/175 Acoustic mirrors
• CPC Class Codes: H03H 9/25 Constructional features of resonators using surface acoustic waves devices for manipulating acoustic surface waves in general G10K11/36
• CPC Class Codes: H03H 9/6406 Filters characterised by a particular frequency characteristic

Abstract

A surface acoustic wave device is provides and comprises a flexible substrate having a first side and a piezoelectric film attached to at least a portion of the first side of the flexible substrate. The piezoelectric film can have a first side and a second side. A surface acoustic wave circuit can adjoin at least a portion of the first side of the piezoelectric film. These devices can comprise thin and flexible substrates, such as polyimide to make the devices flexible. If adhesive is applied to the back of devices constructed in accordance with the invention, such devices can be adhered to almost any surface, even a curved surface. The devices of the present invention can be easily integrated with other devices.

Claims

1. A surface acoustic wave device comprising:

a flexible substrate having a first side;

an acoustic mirror attached to at least a portion of the first side of the flexible substrate, the acoustic mirror having a first side;

a piezoelectric film attached to at least a portion of the first side of the acoustic mirror, the piezoelectric film having a first side;

a surface acoustic wave circuit adjoining at least a portion of the first side of the piezoelectric film; and

,

a protective material overlaying at least a portion of the surface acoustic wave circuit.