Selectable reflector arrays for SAW sensors and identification devices
First Claim
1. A surface acoustic wave sensor or identification device having:
- a piezoelectric substrate,an interdigitated transducer (IDT) input/output mounted on a substrate for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the substrate,an IDT reflector array mounted on the substrate and operable to receive said surface acoustic wave and reflect said surface acoustic wave in modified form back to the IDT input/output for transmission of a corresponding modified RF signal from the device,said IDT reflector array having at least one reflector segment whose reflectivity characteristics are controlled to control the nature of the modified RF signal, andsaid at least one reflector segment having a fluidic chamber which in use contains fluid operable to control the nature of the reflected surface acoustic wave and hence the nature of the modified RF signal.
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Accused Products
Abstract
A surface acoustic wave sensor or identification device has a piezoelectric substrate, an interdigitated transducer (IDT) input/output mounted on a substrate for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the substrate. An IDT reflector array is mounted on the substrate and operable to receive a surface acoustic wave and reflect the surface acoustic wave in modified form back to the IDT input/output for transmission of a corresponding modified RF signal from the device. The IDT reflector array has at least one reflector segment whose reflectivity characteristics are controlled to control the nature of the modified RF signal.
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Citations
10 Claims
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1. A surface acoustic wave sensor or identification device having:
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a piezoelectric substrate, an interdigitated transducer (IDT) input/output mounted on a substrate for receiving a radio frequency (RF) signal and propagating a corresponding surface acoustic wave along a surface of the substrate, an IDT reflector array mounted on the substrate and operable to receive said surface acoustic wave and reflect said surface acoustic wave in modified form back to the IDT input/output for transmission of a corresponding modified RF signal from the device, said IDT reflector array having at least one reflector segment whose reflectivity characteristics are controlled to control the nature of the modified RF signal, and said at least one reflector segment having a fluidic chamber which in use contains fluid operable to control the nature of the reflected surface acoustic wave and hence the nature of the modified RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification