This extender is just a wire? Nothing special to it? Cause if it is just wire I am making one right now 
1 Like
Wire + capacitor. It’s a tank circuit tuned to NFC frequency 
5 Likes
Definitely gonna do this one. My Pixel 3 doesn’t like to read my flexnext from far away, so this seems like a great little mod.
1 Like
What capacitor? Sorry for questions I know nearly nothing about NFC, but have 100 types of capacitors so xd
@Midoriya
Use this calculator to determine what capacitor value to use. First you need to wind a little coil with magnet wire. You can use one of the air-core inductor calculators available online to determine a rough Inductance and wind to those specs, or you can buy an LCR meter to measure the Inductance directly. Once you know the Inductance, you can select an appropriate capacitor using that calculator I linked that will resonate at 13.56MHz.
2 Likes
i might talk to some inlay makers to see about getting special stickers made you just peel off and stick on stuff to “extend” the internal antennas
17 Likes
I was actually going to DM you to suggest the same idea “cheap and easy” enhancement.
1 Like
I reckon DT should start their own brand of cellphones, all equiped with a PM3 in lieu of the measly NFC reader found in ordinary cellphones.
6 Likes
I’m not sure the same size/shape would work for all smartphones but it’s worth a try
also: cameras, fingerprint sensors, speaker outputs might be an issue
Maybe try “strips” , long and narrow coil stickers (especially for x series)
I think as long as the ring is overlapping the nfc antenna in the phone anywhere along the circumference of the original antenna is should work ok… more testing is needed of course, but I think it will be possible to avoid cameras.
The narrow coil shape is not likely to produce much improvement unfortunately, especially for x-series… this is because you need your x-series to cross the coil path perpendicularly and if it crosses both “sides” of a narrow coil I believe it will essentially cancel out the positive effects… but more testing is needed.
1 Like
Opened up my phone today to add a wireless charging board and played around with adding the mod inside the case, directly on the antenna. It works alright so I left it inside 
6 Likes
Any progression on the stickers?
Also curious how this would fair with an iPhone since it’s kind of angled off the top of the phone
Dropped that ball sorry…
1 Like
All good, many irons in the fire I’m
Guessing
1 Like
Pretty interesting idea, did you tried to print this antenna on a flexible PCB?
Nope but if anyone does i’m interested. My hand made one is still inside the phone and works fine 
Well, No pressure on Amal, but it MAY have been looked into
Wow, I kind of love this!
@amal did you? Did this happen? Is this possible? I have my work bonus coming and I’m itching for a shopping list of funky stuff