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Tags and Readers Discussion
Effect of metal on antennas
By H. Sieber 2019-09-17 12:29:36 PM
We design and install RFID systems for trash trucks used for recycling. The original design used the now obsolete TIRIS readers, at 134.2 khz. The antenna is mounted on a large metal lift gate. I would like to emulate the truck installation at my home office so as to pre-tune the antenna prior to shipment to remote locations. The question is, does the thickness of metal affect the rf properties? The only large pieces of metal I have are file cabinets and appliances, and they are thin sheet metal as opposed to the large and heavy lift gate on the truck. Will using thin metal allow accurate tuning? For reference the antenna is a simple loop at 27 uH, embedded in a 1 foot square uhmw block. The loop is 9 in. in dia and about 1.5 in from the metal plane. The lift gate is about 2 x 3 ft. My intuition says the metal thickness will have little effect but I'm hoping someone will confirm.
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