this is a coupled module… basically these are interesting in that the chip itself has its own antenna (as you can see), but how it works is that this antenna couples with a much larger antenna inside the card to get full performance. this approach is used when the module is designed to be put into cards, mini cards, key fobs, and other form factors… but without needing to manufacture entirely different chips for each product. the module is one design, one product… it gets certified as an EMV OEM product, then the final products just design a dual loop coil and this module gets situated overtop of the “small loop” and the “big loop” is what’s actually used to couple with the payment terminal.
there is no way to increase the performance of the small module antenna without doing something similar.
the other side (outside) of the antenna ends in a via… but where does that via go to? you’d have to do some testing i think to figure it out… then you could, in theory, cut the traces to the internal antenna and attach your own… as long as it was the correct inductance for the chip being used, it should drastically improve performance.
You can’t really… it’s… hard to explain. Basically thing if the antenna in the card part like a 1950s paper megaphone… totally passive… the tiny mouth part is the part the module in your photo sits over… the large loud end is the part that talks to the terminal. It’s design doesn’t really allow for the megaphone to be surgically attached human centipede style directly to your vocal cords.
Hard to say without knowing the error. Payment chips must complete the transaction within a very specific amount of time, and if there is not enough power being inducted by the chip because of the small antenna, that timing might extend beyond what the terminal thinks is acceptable. More likely though, the terminal was just not programmed with discover card keys and could not read the chip… A common problem in North America.
So do you have a suggestion what I should do with the extra antenna I have or just keep it as is and try it with different card readers? I’m pretty sure that the one I tested on works with discover. I saw the discover logo, but I have not tested with the card before I took the chip out so I can’t be 100% on that.
Would it be possible to use the antenna some how so it can respond to the terminal in time?
I got the card in the USA. I heard about the payment rings in the UK and wanted to make one my self because it’s not available here in the USA. The ring is made from PLA plastic, I used my 3d printer to make the ring.
Tough night be able to use that wire sure… enamel coated magnet winding wire is all the same basically… but you will need to do some research and math to figure out how many “turns” you’ll need to make and if you have enough wire.