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How to design a 125khz antenna for 1 meter RFID reader?
Considerations: Going for a RF Gate Antenna (the ones you find in clothing store) and plug & play with RFID reader? Increasing the size/ length of the antenna coil but maintaining the same inductance. Adding multiple small antennas (like an Array) across the length of the pillar. Making a dual loop antenna to cover the broader range.
How tall is a 10x10cm loop antenna?
Current State – The below current 10x10cm loop antenna provides me a range upto (~1 ft). Question: How do i design an Antenna in such a way it has a read range of 5 – 6 feet (throughout the height of pillar) and having read distance up to 3 feet (distance where the tag is presented)? Here the read range is as important as the read distance.
Why do you need a strong magnetic field for RFID?
A strong oscillating magnetic field is needed to charge the tag at a distance and a sensitive loop is needed to detect the small changes in antenna voltage to read the returned message. The same antenna needs to suit two different goals.
How does a small RFID reader increase range?
The small RFID reader boards are “proximity” (industry term) devices that are only designed to work at close range, such as with a handheld. You do not mention the tag size which also has an effect. A larger one would increase read range. Tiny glass tags have short range even with powerful readers.
How to measure the inductance of a frequency?
Finally, read out the frequency, and calculate the inductance from L=4.57/f. With L in Henry and f in Hz. You may also prefer L=4570/f with L in uH and f in kHz. Figure 2.1 Measuring unknown inductors.
How to measure the resistance of an unknown inductor?
In this formula L represent the inductance, R the resistance (50 ohm), and omega the radial frequency ( = 2*pi*f with f in Hz). The question now is for what frequency (Vscope/Vgen) = 0.5: So finally: In which L is the inductance in Henry, and f the frequency in Hz.
Can a RFID reader generate a strong magnetic field?
Your reader does not appear to be powerful enough to generate a magnetic field that has sufficient strength. You need to consider a reader that can supply more current to the antenna or some way to boost it. Look for a “long range” reader (RFID industry term) for a better solution.
How does FDX work on a RFID reader?
With FDX, the tag increases and decreases the resistance (shorts) across its internal coil to cause slight changes in the reader antenna voltage to communicate the 1’s and 0’s (load modulation). A tiny tag does not put a lot of load to an antenna with a weak magnetic field that is 1m away. Make sure the antenna is properly tuned.
Can a small RFID board increase read range?
The small RFID reader boards are “proximity” (industry term) devices that are only designed to work at close range, such as with a handheld. You do not mention the tag size which also has an effect. A larger one would increase read range.