Inductive input/output coupling for a surface acoustic wave device
First Claim
1. Apparatus for coupling electrical energy into and/or out of a surface acoustic wave (SAW) device, such as a transponder, said SAW device having a piezoelectric substrate with an exposed surface;
- at least one SAW transducer, disposed on said substrate surface, for converting between electrical energy and SAW energy; and
a conductive loop disposed on said substrate surface and electrically connected with said transducer, said conductive loop forming an inductive element for coupling energy into and/or out of said SAW device;
said apparatus comprising, in combination;
(a) a first inductive loop formed by at least a partial turn of an electrical conductor, said first inductive loop being inductively coupled to said conductive loop on said substrate surface; and
(b) means for transmitting and/or receiving an electrical signal to and/or from said SAW device, said means having a second inductive loop which is inductively coupled to said first inductive loop,whereby said first inductive loop forms an intermediate inductive coupling path between said second inductive loop of said transmitting/receiving means and said conductive loop on said substrate surface.
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Accused Products
Abstract
A transponder for use in an interrogator/transponder system includes a piezoelectric substrate for coupling electrical energy into and/or out of a surface acoustic wave (SAW) device; a first inductive loop inductively coupled to a conductive loop on the substrate, a second inductive loop inductively coupled to the first inductive loop for transmitting and/or receiving electrical signals to and/or from the SAW device. The first inductive loop forms an intermediate inductive coupling path between the second inductive loop of the transmitter/receiver and the conductive loop on the substrate.
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Citations
19 Claims
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1. Apparatus for coupling electrical energy into and/or out of a surface acoustic wave (SAW) device, such as a transponder, said SAW device having a piezoelectric substrate with an exposed surface;
- at least one SAW transducer, disposed on said substrate surface, for converting between electrical energy and SAW energy; and
a conductive loop disposed on said substrate surface and electrically connected with said transducer, said conductive loop forming an inductive element for coupling energy into and/or out of said SAW device;
said apparatus comprising, in combination;(a) a first inductive loop formed by at least a partial turn of an electrical conductor, said first inductive loop being inductively coupled to said conductive loop on said substrate surface; and (b) means for transmitting and/or receiving an electrical signal to and/or from said SAW device, said means having a second inductive loop which is inductively coupled to said first inductive loop, whereby said first inductive loop forms an intermediate inductive coupling path between said second inductive loop of said transmitting/receiving means and said conductive loop on said substrate surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- at least one SAW transducer, disposed on said substrate surface, for converting between electrical energy and SAW energy; and
Specification