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How can I increase the range of NFC antenna?
To increase the range you have to increase the RF field to keep the tag powered, but if you do that you make it harder for the tag to answer. That’s why NFC only works up to 15cm. The range limit is designed into the technology and it’s a security feature of NFC.
What is an NFC antenna?
NFC Antenna is a 13.56MHz antenna for Near Field Communication (NFC). It has a IPX/U. FL connector and can be used by NFC Shield V2, Xadow NFC and Grove NFC.
NFC tags (stickers and inlays) are available in a wide variety of sizes. The smallest stickers can be just 5-6mm square. The largest is typically about the size of a credit card at around 85mm x 55mm.
How small can an NFC antenna be?
So the challenge in NFC antenna design is to obtain a “radiating” structure when the NFC antenna area may be limited to 3″x1″ (or 7 cm * 2.5 cm). Hence, we are talking about fitting an antenna into a volume where the maximum linear dimension is about 0.5% or less of a wavelength.
How does NFC antenna work?
An active device (usually a mobile phone) generates a local magnetic field which induces an electric current in the antenna of the passive device (the NFC Tag). This electrical energy powers the NFC Chip which creates a further magnetic field in it’s antenna which can be read by the active device (the phone).
What is the smallest NFC chip?
NTAG213 chip
One of the smallest NFC Stickers, with NTAG213 chip, compatible with all devices, of dimensions only 12 x 19 mm.
How do I connect my NFC antenna?
To connect via NFC, touch the camera N-Mark logo to the smart device NFC antenna (for the location of the NFC antenna, see the documentation provided with the smart device). Maintain contact until the camera displays a message stating that an NFC device has been detected.
What are the dangers of NFC?
Possible security attacks include eavesdropping, data corruption or modification, interception attacks, and physical thefts. Below we cover the risks and how NFC technology works to prevent such security breaches from occurring.
What makes an NFC antenna a NFC antenna?
If the magnetic fields from one inductor pass near another inductor, an induced current will exist within the second inductor. This is contactless energy transfer – exactly what NFC requires. Hence, an NFC antenna isn’t an antenna at all – it is really just a big inductor.
How big is the chip on an NFC tag?
An NFC tag is an antenna and chip encased in or stuck to plastic. Due to manufacturing tolerances, the size of that plastic support disc will be larger than the size of the antenna – you will have a border.
How are NFC antennas measured on Smith chart?
As you can see, the NFC antenna is literally just a big loop. Now, if we cable up to the nfc antenna and measure S11 on the Smith Chart with a Vector Network Analyzer (VNA), we get the result in Figure 4: Figure 4. NFC Antenna Measured on Smith Chart from f=3 MHz to 30 MHz.
What should the height of the NFC loop be?
As a result, for performance the height of the NFC loop will need maximized. If the space is near zero, the performance will suffer. One small trick to get around this is to use high permeability sheets (ferrite, iron based, whatever) between the NFC antenna and the metallic ground plane.