IC business card

A business card that can be used as an RFID card uses NT3H1101W0FHKH as the main control IC.

You can add the pictures or text you want to place on the front and back of the business card. If possible, you can choose the gold plating process, and a high-quality business card will come out. In order to add some sense of technology, an RFID chip is added to realize NFC data transmission.

Production process

Selection of chips is the core of success. Currently, NXP's NTAG NT3H1101 is widely used, with a high success rate and small size.

To achieve communication and power supply, antennas must be designed.

• Voc is the magnetic field induced voltage in the loop antenna
• Ra is the equivalent resistance of the loop antenna
• La is the loop antenna equivalent inductance
• Rs is the series equivalent resistance of the chip
• Cs is the series equivalent tuning capacitance of the chip

It is known that the RFID operating frequency is 13,56 MHz and the NT3H1101 tuning capacitor is 50 pF, then the calculation formula of the inductor L is:

NXP provides gerber files for antennas built by its engineers and integrated into some of its products. The main advantage of this design is that it has been simulated, calibrated and fully optimized. download .

NXP recommends using a "Class 3", "Class 4", "Class 5" or "Class 6" antenna.

I decided to use a class 4 rectangular antenna, the perfect size for my business card, which should be located within the area defined below:

• External rectangle: 50 x 27mm
• Inner rectangle: 35 x 13mm, centered on outer rectangle, corner radius 3mm

The layout of the inductive antenna on the PCB requires special attention*** because radio waves cannot pass through metal, so there must be no copper plane above or below the antenna.

Design progress:

• √ Antenna layout design

• √ Business card content layout

• √PCB proofing

• √Welding debugging

• • -

Since the chip is very small, novices recommend SMT

This card can realize NFC communication with the mobile phone, open the website, connect to WiFi, add contacts, etc. It cannot be used as an M1 card.

The card type is Ultralight card, which is MF0 card.

M1 cards such as campus cards and meal cards cannot be copied! ! !