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Near Field Communications - In antennae theory Far Field radiation is that RF energy that gets transmitted, Near Field is the RF energy that typically does not propagate , unless it is intercepted by a special antenna. It is used to transmit signals over short distances without transmitting widely, it is used in wireless communications for very short ranges on the order of meters and is harder to intercept because you have to be close.

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I’m trying to interface an OM27160A1HN board with a Raspberry Pi over I²C, using an extended wires to connect a NFC antenna lk1860201, and following the setup instructions from the NXP application ...
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I am getting confused and overwhelmed by all the information about communication protocols etc. when I want to just clarify the basic physics. NFC: From what I can tell it's just basic inductive ...
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I’m designing my first NFC-based PCB business card using a 13.56 MHz antenna. The core idea is to use the RF430FRL152H (by TI) with a PCB antenna, and I used ST’s LC circuit calculator to design the ...
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I am currently developing a 4 layer PCB contactless reader based on the MFRC522 which I use to write 4KB of data on a MIFARE card. I have followed AN1445 Topology 1 design and my antenna is similar to ...
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I'm designing a PCB business card that includes an NFC antenna for sharing contact information with mobile devices. There are two specific design choices I'm considering, and I’d like to understand ...
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I'm using the ANT7-T-25DV64KC and trying to light up an LED by using my phones NFC capability. I've connected the RF pin hole to a wire and then connected that to the LED Anode. But my LED doesn't ...
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I am making a custom board with the NTP5332 IC (by NXP) and the A7341 Color sensor IC which communicates via I2C and displays the sensor value in a smartphone application (there is a NFC application ...
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I want to use a flex antenna with the NTAG5-LINK (NTP5332) by NXP. NXP has designs for Class 4,5 and 6 antennas (https://www.nxp.com/products/no-longer-manufactured/ntag-ic-iplus-i-flex-kit-containing-...
Samiha Ahmed's user avatar
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I want to design a circuit that can read data from a sensor (this is a color sensor ,AS7341) and it will be connected to a LED. But I want the circuit to be lightweight and don't want to use a battery....
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For my project, I need to detect small NFC tags (like this one: URL) at a 1 cm range on a surface that is roughly 20 x 10 cm. My initial thought was to use an NFC reader with an antenna of ...
uz3il's user avatar
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I am planning on creating a gameboard which uses NFC to read and write data to figurines on the tiles. So far my research has brought me a lot of info but nothing to really piece it together. For my ...
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My goal is to put a strain gauge to work in conjunction with an NFC or any wireless energy and data transfer system. Well, I've been looking at some nfc examples but they all work by returning pre-...
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I want to build a Scrabble board that detects tiles placed, mainly as a one off challenge and learning experience (i.e. not a commerical product). I haven't started building yet: I'm trying to work ...
Simon's user avatar
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I am looking to design a custom RFID antenna which operates at 13.56 MHz. I have designed the antenna using the NFC Design tool (link). Please see the parameters below: Figure 1: Antenna parameters ...
Dániel Határ's user avatar
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I was trying to fabricate a flexible NFC antenna. Initially, I fabricated my design on a copper PCB. It worked perfectly fine with my NFC chip and facilitated NFC communication. I observed its S11 ...
Isuru Bhathiya's user avatar
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I am currently working on antenna matching for an ST25R3911B NFC reader IC and using HFSS for simulation purposes. STMicroelectronics provides an antenna matching tool, and I am planning to use a ...
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I'm looking for help with my NFC (13.56MHz) antenna design. I am using a NXP-NT3H2111 NFC IC and so far I have read through the application note and other research papers available online to try ...
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I'm working on a design using an NXP PN7150 NFC chip with PCB antenna. My initial prototype used their online tool for the antenna design, to generate the values for the matching network, however this ...
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I'm trying to wrap my head around NFC tag inner workings. In particular I'm curious whether different coils are used for harvesting energy and to transmit data. This random NFC tag IC datasheet I ...
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I am trying to send commands and image data to an NFC module connected to an e-paper display and keep getting TagLostException, probably meaning the command is wrong. I have asked this question on ...
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I have designed a custom PCB for one of my side projects. PN532 is interfaced with ESP32 over i2c. Goal is to have the system consume current in uAmps range when in deep sleep. I put ESP32 in deep ...
Hamza's user avatar
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Is there a way to disable (kill) the NFC tag so that it doesn't trigger the reader. Without physical intervention. My goal here is for the smartphone not to get triggered by a disabled NFC tag. ...
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I want to build an NFC-transponder (NFC chip: ST25DV) which is powered over energy harvesting. How could I calculate the size of the goldcap (supercapacitor) or maybe a normal tantalum capacitor to ...
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I'm trying to create a double-sided NFC cards, where the two sides read different things. So depending on which side you hold onto your phone, you get a different result. I've tried with a sheet of ...
Reactormonk's user avatar
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I am building this circuit for an NFC component ST25R95 on a small PCB. I am wondering if I can disregard the marked components on the power supply (inductors and capacitors for filtering.) These ...
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I'm trying to do a project using RFID tags to store information to be retrieved later with another device. Kind of a storage memory. I've bougth several tags which I can write and read with several ...
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I have a hard time understanding how I can impedance match a homemade NFC antenna to 50 Ω. My antenna is designed by calculating the inductance based on the dimensions, windings, and so on. R_ant is ...
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Do you know if both NFC and a magnet would work correctly in this scenario? I´m designing small pieces of concrete (imagine chess pieces) with three layers: magnet inside, NFC tag in the middle, and ...
Kaixo's user avatar
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I am currently trying to figure out why my NFC reader circuit with MFRC522 chip is not working and I stumbled upon this in the datasheet. In the section describing how to activate different digital ...
Lob Ster's user avatar
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I have a receiving antenna (9 turn spiral, 1cm in diameter) that I would like to measure (inductance) wirelessly at 13.56MHz. While looking through application notes from ST and NXP semiconductors, I ...
Aayush Chadha's user avatar
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I am using the RF430FRL152HEVM kit for NFC communication with a mobile phone. I am building an app to read from this evaluation board and I am having trouble sending/reading an NDEF signal. I saw that ...
Saad Satter's user avatar
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I want to design an antenna that will work with RFID NFC chip NHS3152. The NHS3152 IC specs are: IC capacitance at precise measurement conditions For this particular IC, there is a demoboard. Since I ...
Leo's user avatar
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From what I understand there is always an active (reader/writer) and a passive (tag) NFC device. Is it possible to have an NFC tag which is part of a circuit and works as a switch or a relay? I would ...
Andrej's user avatar
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I have been trying to design a Battery powered NFC Reader using Quectel SC60 module with SAM interface. So , the problem is that in the reference design, LDO is always connected to VBAT thus draining ...
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I have been trying to design an NFC Reader using a Quectel SC60 module with a Secure Access Module (SAM) interface. The problem is that in the reference design, the SAM is connected directly to the ...
Curious Cosmopolitan's user avatar
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I need to read a tag in a range of about 5 to 10 cm (with 2 thin (~1 cm) layers between, one in plastic, the other in ceramic). I tested two devices: the RFID-RC522 and the PN532 (in NFC mode, reading ...
Dark Patate's user avatar
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My design requires a NFC antenna to be located on a different board and due to space limitations, a uFL connector can't be placed for a mini coax connection. A flex cable solves many of the design ...
pcbguy's user avatar
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I am not sure if this is right place for this question. NFC bandwidth can go up to 50KB per second, and there are NFC business cards that have EPROM up to 8kb. Is there possibility to put micro SD ...
dejan0milosevic's user avatar
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I am using a simple pick up coil attached to an oscilloscope (and as pictured a Saleae Logic Pro 16) to monitor the NFC traffic between a reader (PCD) and ISO15693 tag (PICC). The reader is a PN5180 ...
paul_25's user avatar
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I'd like to make a bracelet which has an RFID tag and LEDs inside of it. I made a device (using Arduino and rc522) that will categorise people's bracelets into one of 3 categories when it touches the ...
Rezi's user avatar
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I need to build an application to detect an NFC antenna without an NFC passively powered chip. As we know, we can detect an NFC tag by powering the NFC chip inside this tag. It will then broadcast its ...
user176024's user avatar
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Documentations indicates a maximum number of read/write of 100 000 cycles for some passive NFC tags (for ex NTAG215, NTAG216, ...) Does this limitation apply if I only read the UID without any writes /...
angelodlfrtr's user avatar
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NFC tags are passive devices and get their power from the NFC reader/writer. For my question, I'm specifically asking for recent smartphones as NFC readers/writers. Does the phone transmit enough ...
fameman's user avatar
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Hi I’ll get straight to the point... theoretically if I built an antenna loop that went around a door frame including under the carpet so I could walk through the loop, then connected the antenna to a ...
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I have an RFID tag for access to my apartment building that I would like to clone(buying one through strata would be 100s of dollars). I have a proxmark 3 easy and have cloned tags in the past with ...
bega2550's user avatar
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As NFC are active upto 15cm range, i/m using a PN532 to write data into a NXP NFC enabled EEprom, which is successful, i want to increase its range by 2X by increasing the Power or size of Antenna for ...
JOHN JUSTEEN's user avatar
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I'm currently working on a design who involve a NFC chip (ST24DV) who need to be on the board as it's used to communicate with a smartphone. Here is the picture of the antenna: There is a LED on the ...
Prof_Sims's user avatar
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I have an NFC tag application that uses an external antenna. The antenna itself has not been properly selected just yet, but my question is with regards to connecting the external antenna to the NFC ...
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I have an idea for a distributed communication platform that I want to build. For my project, I would have many phones, and I would like to send ~20kb of data between each phone at a minimum range of ...
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In a reader design i experiencing some problems with RFID tags. I've evaluated the different tags, and they all are made equally - the tag size, tag chip type, antenna and antenna geometry are ...
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