Wireless communication system using surface acoustic wave (SAW) second harmonic techniques
First Claim
Patent Images
1. A device comprising:
- an antenna configured to receive a radio frequency (RF) signal and to generate an electrical signal from the RF signal;
a substrate;
a first interdigital transducer (IDT) configured to generate, from the electrical signal, a surface acoustic wave that propagates along the substrate; and
a second IDT that is located on the substrate and has fingers that extend from two opposite terminals and are configured based on a code, the two opposite terminals being short circuited together so that the second IDT will receive the surface acoustic wave from the first IDT and reflect, back to the first IDT, a surface acoustic wave that includes a code based on a configuration of the fingers;
the first IDT being configured to generate, from the reflected surface acoustic wave, an electrical signal based on the code; and
the antenna being configured to transmit, from the coded electrical signal, a RF signal based on the code.
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Abstract
A system is for encoding information on a passive surface acoustic wave (SAW) device. The system includes a requesting unit configured to wirelessly transmit an impulse signal. The impulse signal is a signal that includes only a single pulse. A SAW device has an interdigital transducer (IDT) configured to physically store coded data. The SAW device is configured to receive the impulse signal. In response to receiving the impulse signal, the SAW device excites the IDT to generate a coded signal that includes the stored coded data and frequency components at a fundamental frequency.
48 Citations
20 Claims
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1. A device comprising:
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an antenna configured to receive a radio frequency (RF) signal and to generate an electrical signal from the RF signal; a substrate; a first interdigital transducer (IDT) configured to generate, from the electrical signal, a surface acoustic wave that propagates along the substrate; and a second IDT that is located on the substrate and has fingers that extend from two opposite terminals and are configured based on a code, the two opposite terminals being short circuited together so that the second IDT will receive the surface acoustic wave from the first IDT and reflect, back to the first IDT, a surface acoustic wave that includes a code based on a configuration of the fingers; the first IDT being configured to generate, from the reflected surface acoustic wave, an electrical signal based on the code; and the antenna being configured to transmit, from the coded electrical signal, a RF signal based on the code. - View Dependent Claims (2, 3, 4, 5)
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6. A device comprising:
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an antenna configured to receive a radio frequency (RF) signal and to generate an electrical signal from the RF signal; a substrate; a first interdigital transducer (IDT) configured to generate, from the electrical signal, a surface acoustic wave that propagates along the substrate; and a second IDT that is located on the substrate and has fingers that extend from two opposite terminals and are configured based on a code, the two opposite terminals being open circuit terminated so that the second IDT will receive the surface acoustic wave from the first IDT and reflect, back to the first IDT, a surface acoustic wave that includes a code based on a configuration of the fingers; the first IDT being configured to generate, from the reflected surface acoustic wave, an electrical signal based on the code; and the antenna being configured to transmit, from the coded electrical signal, a RF signal based on the code. - View Dependent Claims (7, 8, 9, 10)
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11. A method comprising:
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receiving, by an antenna, a radio frequency (RF) signal; generating, by the antenna from the received RF signal, an electrical signal; generating, by a first interdigital transducer (IDT), from the electrical signal, a surface acoustic wave; generating, by a second IDT from the surface acoustic wave, a reflected surface acoustic wave that includes a code; generating, by the first IDT from the reflected coded surface acoustic wave, a coded electrical signal; and transmitting, by the antenna from the coded electrical signal, a coded RF signal. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification