Surface acoustic wave identification tag having enhanced data content and methods of operation and manufacture thereof

• US 6,966,493 B2
• Filed: 12/18/2001
• Issued: 11/22/2005
• Est. Priority Date: 12/18/2001
• Status: Expired due to Term

• Current Assignee: RF Saw Components Incorporated
• Original Assignee: RF Saw Components Incorporated
• Inventors: Hartmann, Clinton S.
• Primary Examiner(s): Kim, Ahshik
• Application Number:
  US10/024,624
• Publication Number:
  US 20030111540A1
• Time in Patent Office: 1,435 Days
• Field of Search: 235/454, 235/455, 235/375, 235/492, 340/10.1, 340/10.3, 340/10.4
• US Class Current: 235/454
• CPC Class Codes: G01S 13/755 using delay lines, e.g. acoustic delay lines
• CPC Class Codes: G01V 15/00 Tags attached to, or associated with, an object, in order to enable detection of the object record carriers for use with machines having a detectable tag or marker G06K19/00
• CPC Class Codes: G06K 19/0675 the resonating marks being of the surface acoustic wave [SAW] kind SAW devices per se H03H9/64
• CPC Class Codes: H03H 9/6406 Filters characterised by a particular frequency characteristic

Abstract

A surface acoustic wave (SAW) identification tag and methods of operating and manufacturing the tag. In one embodiment, the tag includes: (1) a piezoelectric substrate having a SAW transducer located thereon, (2) a group of slots arranged by both pulse position and phase position on said substrate; and (3) a number of reflectors distributed among the slots such that the reflectors encode a number by both pulse position and phase position.

Claims

1. A SAW identification tag, comprising:

a piezoelectric substrate having a SAW transducer located thereon;

twelve groups of slots arranged by both pulse position and phase position on said substrate, said groups separated by dead spaces; and

a number of reflectors distributed among said slots such that said reflectors encode a number by both pulse position and phase position, said number at least 96 bits long.

2. A surface acoustic wave (SAW) identification tag, comprising:

a piezoelectric substrate having a SAW transducer located thereon, said SAW transducer configured to produce a SAW having a frequency of between two and three gigahertz;

a group of slots arranged by both pulse position and phase position on said substrate; and

a number of reflectors distributed among said slots such that said reflectors encode a number by both pulse position and phase position.

3. A method of operating a surface acoustic wave (SAW) identification tag, comprising:

exciting a SAW transducer located on a piezoelectric substrate to create a SAW;

causing said SAW to reflect from reflectors distributed among twelve groups of slots arranged by both pulse position and phase position on said substrate, said groups separated by dead spaces; and

demodulating reflected portions of said SAW to yield a number encoded by both pulse position and phase position, said number at least 96 bits long.

4. A method of operating a surface acoustic wave (SAW) identification tag, comprising:

exciting a SAW transducer located on a piezoelectric substrate to create a SAW, said SAW having a frequency of between two and three gigahertz;

causing said SAW to reflect from reflectors distributed among a coup of slots arranged by both pulse position and phase position on said substrate; and

demodulating reflected portions of said SAW to yield a number encoded by both pulse position and pulse position.

5. A method of manufacturing a surface acoustic wave (SAW) identification tag, comprising:

forming a SAW transducer on a piezoelectric substrate; and

depositing reflectors among twelve groups of slots, said groups separated by dead spaces and said reflectors arranged by both pulse position and phase position on said substrate and encoding a number at least 96 bits long by both pulse position and phase position.

6. A method of manufacturing a surface acoustic wave (SAW) identification tag, comprising:

forming a SAW transducer on a piezoelectric substrate, said SAW transducer configured to produce a SAW having a frequency of between two and three gigahertz; and

depositing reflectors among a group of slots arranged by both pulse position and phase position on said substrate, said reflectors encoding a number by both pulse position and phase position.