What is it about?

A metal plate with a slot is used with a module containing a chip to create an HF RFID card. This design is different to conventional card designs that usually incorporates a coil and a chip. The presence of metal in such environment would deteriorate the performance, however, in such design it enhances performance. We explain how this is achieved, the card's theory of operation, present a circuit model and also provide our own enhancement to such design to increase bandwidth and power transfer significantly.

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Why is it important?

This work provides the first explanation for the operation of such metal frame-based cards where earlier it was believed that these cards operates based on capacitive coupling while we were first to prove that this is rather inductive coupling. Furthermore, we derived a circuit model for such cards that later helped into introducing two enhancements to the design that significantly enhances the card's bandwidth and power transfer characteristics

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This page is a summary of: Metallic Inductive Coupling Frame-Based HF RFID Cards , IET Microwaves Antennas & Propagation, December 2017, the Institution of Engineering and Technology (the IET),
DOI: 10.1049/iet-map.2017.0573.
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