diy rfid reader antenna I am designing a large loop antenna working at 125 kHz. To maximize the range of my system I am aiming for 1m diameter loop antenna with as many turns as I can allocate (e.g. ~100 for 18 AWG). I have succesfully designed antennas of diameter=40cm with L=5mH.
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before beginning, you have to know that there are mainly two type of RFID Reader: 125 khz : antenna of 100 turn coil; 13.6 Mhz : antenna of 3-5 turn coil, more sofisticated can include .Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the lar. First, the reader sends a low-frequency which wakes up the reader antenna of the passive RFID tag and turns on the connected circuit. Then, the tag would use a different .As you guys would know industrial RFID readers aren't cheap, how do you energise the antenna, then read back the output? If you are looking for something cheap this may do the trick. There's a University (UG) level final project detailing one. There's a more general RFID eavesdropper/reader.
Target System - I am looking to build/ extend the range of 125khz RFID reader upto 1 meter (~ 3ft) to be captured while walking through a gate detector (kind of like two pillar antenna in pic below). Reason: Commercial gate readers are way too costlier to implement so am looking to build my own. Current State - The below current 10x10cm loop . I am designing a large loop antenna working at 125 kHz. To maximize the range of my system I am aiming for 1m diameter loop antenna with as many turns as I can allocate (e.g. ~100 for 18 AWG). I have succesfully designed antennas of diameter=40cm with L=5mH. DIY RFID reader antenna array. I want to build a DIY RFID reading system that can read a wide surface area. My idea is to connect one single PN532 chip with multiple RFID antenna using multiplexing. The antenna must be as thin as possible and flexible. After after having removed the IC from a RFID sticker, can the sticker coil be used as a RFID .On board 13.56MHz RFID antenna design. I recently stumbled upon a two-in-one NFC key designed by N-O-D-E and was astonished. Although its original purpose is for security, I love the idea of using tact switch to decide which NFC chip is responding to the reader. So I wanted to build myself a mifare 1k version of it.
It would be about 160 x 70 mm. My understanding is that optimal communication between the reader and tag occur when the two antennas have roughly the same size. Here the target tag is a standard Mifare card, so the antenna is usually roughly 75 x 45 mm. Some of the questions/answers such as this one focus on getting a larger range (distance . sounds a bit strange for a university project. When using a NFC standard loop coil antenna, sized about 4x4 cm, the theoretical maximum working distance is 20 cm. In practice, the range for reliable communication is much smaller, usually about 5 cm (4 times smaller). If you analyze the underlying physical equations, for the case of a circular . 1. You want a magnetic loop antenna. A wire loop around the doorframe with a tuning capacitor on the left and cellphone on the right. Borrow a grid dip meter from your local ham radio club and adjust the capacitor to resonate .Some tags are non-ISO/proprietary and can only be read with the manufacturer's reader. Many 125 kHz readers can be modified to read 134.2 kHz by replacing the crystal. There are higher power readers that can read 12mm tags at much larger distances than what the Arduino and other simple readers can do.
2. The one simple fact you're missing there is: Passive RFIDs don't transmit data. Instead they use a technique called "backscatter": Passive and semipassive RFID tags do not use a radio transmitter; instead, they use modulation of the reflected power from the tag antenna.As you guys would know industrial RFID readers aren't cheap, how do you energise the antenna, then read back the output? If you are looking for something cheap this may do the trick. There's a University (UG) level final project detailing one. There's a more general RFID eavesdropper/reader.
Target System - I am looking to build/ extend the range of 125khz RFID reader upto 1 meter (~ 3ft) to be captured while walking through a gate detector (kind of like two pillar antenna in pic below). Reason: Commercial gate readers are way too costlier to implement so am looking to build my own. Current State - The below current 10x10cm loop . I am designing a large loop antenna working at 125 kHz. To maximize the range of my system I am aiming for 1m diameter loop antenna with as many turns as I can allocate (e.g. ~100 for 18 AWG). I have succesfully designed antennas of diameter=40cm with L=5mH. DIY RFID reader antenna array. I want to build a DIY RFID reading system that can read a wide surface area. My idea is to connect one single PN532 chip with multiple RFID antenna using multiplexing. The antenna must be as thin as possible and flexible. After after having removed the IC from a RFID sticker, can the sticker coil be used as a RFID .On board 13.56MHz RFID antenna design. I recently stumbled upon a two-in-one NFC key designed by N-O-D-E and was astonished. Although its original purpose is for security, I love the idea of using tact switch to decide which NFC chip is responding to the reader. So I wanted to build myself a mifare 1k version of it.
It would be about 160 x 70 mm. My understanding is that optimal communication between the reader and tag occur when the two antennas have roughly the same size. Here the target tag is a standard Mifare card, so the antenna is usually roughly 75 x 45 mm. Some of the questions/answers such as this one focus on getting a larger range (distance . sounds a bit strange for a university project. When using a NFC standard loop coil antenna, sized about 4x4 cm, the theoretical maximum working distance is 20 cm. In practice, the range for reliable communication is much smaller, usually about 5 cm (4 times smaller). If you analyze the underlying physical equations, for the case of a circular . 1. You want a magnetic loop antenna. A wire loop around the doorframe with a tuning capacitor on the left and cellphone on the right. Borrow a grid dip meter from your local ham radio club and adjust the capacitor to resonate .
Some tags are non-ISO/proprietary and can only be read with the manufacturer's reader. Many 125 kHz readers can be modified to read 134.2 kHz by replacing the crystal. There are higher power readers that can read 12mm tags at much larger distances than what the Arduino and other simple readers can do.
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