SURFACE ACOUSTIC WAVE TRANSPONDERS
First Claim
1. An electronic transponder comprising:
- an one antenna for receiving and transmitting radiofrequency signals;
ansurface acoustic wave device, wherein anelectronic filter with narrow spectral band centered on a central frequency and a delay line operating in reflection mode, the electronic filter and the delay line being arranged in series.
1 Assignment
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Accused Products
Abstract
The field of the invention is that of surface acoustic wave transponders and associated devices. This invention applies more particularly to the techniques for identifying and locating transponders. It also applies to the transmission of information or measurements, the transponder then being used as a transducer. This type of transponder can, in particular, be used on vehicles, and in particular on road vehicles. The inventive transponder (1) comprises a surface acoustic wave device, comprising one or more electronic filters (101) with narrow spectral band centered on one or more central frequencies and a delay line (102) operating in reflection mode. By having narrowband filters centered on different frequencies, it is thus possible to easily discriminate between different transponders. The delay lines make it possible to simply separate the transmitted signal and the received signal. The inventive transponder can also be used as a transducer. Also, by using an interrogation device that uses two receive antennas, it is possible to locate the position of several transducers with a single interrogation device.
17 Citations
20 Claims
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1. An electronic transponder comprising:
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an one antenna for receiving and transmitting radiofrequency signals;
ansurface acoustic wave device, wherein an electronic filter with narrow spectral band centered on a central frequency and a delay line operating in reflection mode, the electronic filter and the delay line being arranged in series. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification