2018-03-18 (Su) RFIDWand and RFIDField Sensor cards

People have appreciated getting NFC business cards. They serve as a useful tool, and they make an impression. So far, the antennas have run the circumference of the card for a single LED which is great for harvesting energy, but there is not much precision. Finding the size and location of an NFC antenna can be difficult and time-consuming. Using several smaller antennas, similar to the ones found in cosmetic fingernail lights, may make it easier to locate an antenna.

A small antenna which stays close the LED was drafted in the electronics design automation software. Multiple iterations of the antenna/LED were arranged in a row and placed on a small PCB which could be carried easily.

NFC sensing wand, layout, top and bottom

The same wand arrangement was used on a business card. This configuration shouldn’t be any more functional but it is longer so it may be easier to hold, but fewer can be carried. With a simple wave, the lights should describe exactly where all antenna traces are inside a phone.

NFC sensing card with row of LED/antennas, layout, top and bottom

A two-dimensional grid of the small antennas should make waving unnecessary. The 10x4 matrix should simply light up wherever it covers a transmitting coil. One problem could arise if one of the antennas pulls more power than the others so it might appear that the transmitting antenna is moving. This could be cool in its own way.

Matrix of LED/antennas, layout, top and bottom

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2018-01-06 (Sa)