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Designing a Transponder Coil for the HCS410

From Microchip Technology, Inc.
 

 
This application note explains the design of transponder coils. An Excel spreadsheet is used to automate the update of values, depending on the specified parameters. The spreadsheet file name is transpnd.xls. A zip file containing this spreadsheet and a copy of this application note can be downloaded from Microchip?s web site at www.microchip.com. The basic approach is to choose the transponder coil external dimensions, since volume will usually be the primary constraint for a coil as it will need to fit into a keyfob, credit card or other small volume. Secondly, properties of the core, coil windings as well as the equivalent load placed across the coil are entered. This fixes the Initial Coil Specification. Once the initial coil is built, measurements are made on this coil to determine the coil quality factor. These measurements are used to calculate the Optimum Coil Specification for a second coil.
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