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|A miniaturized dual band antenna for harmonic RFID tag|
|Keywords: Genetic Algorithm, Miniaturized, Harmonic|
|Recently, harmonic RFID tags have become popular compared to single frequency commercial RFID tags due to enhanced performance in presence of strong clutter source . The background clutter can arise due to reflections of EM waves from ground or metallic objects in an industrial environment. The clutter would affect the performance of a single frequency RFID tag by limiting the detection rate for a long read range. Hence, a clutter resistance dual frequency harmonic RFID can be effective for a long range operation. A miniaturized antenna is required for a small form factor RFID tag. For harmonic RFID tag, the tag should be capable of receiving and transmitting at two different frequencies (fundamental and harmonic). Implementation of two different antennas for the operation would increase the footprint of the antenna. Hence, an optimized antenna structure is proposed, which will have a small form factor while maintaining a considerable gain. Among different optimization techniques, genetic algorithm is widely used and is considered for the design. The dual band antenna would be capable of receiving at fundamental frequency and transmit information at harmonic frequency while maintaining small tag size. The harmonic RFID tag would be useful for numerous RFID applications where the single frequency tags will not be a good option such as underground object tagging, long range tag detection in an industrial set up with strong reflectors such a metal in the vicinity of the tag. In this paper, the design, fabrication and characterization of dual band harmonic RFID tag antenna will be shown.|
|Saikat Mondal, Graduate Research Associate
Michigan State University
East Lansing, MI