- #1
banerjeerupak
- 122
- 1
I need to know the maximum range in which a radio frequency identification device (RFID) can function. What is it limited by?
Maximum range (RFID) can function
Click For Summary
Discussion Overview
The discussion centers on the maximum operational range of radio frequency identification devices (RFID) and the factors that limit this range. It includes technical explanations and considerations regarding the performance of RFID systems.
Discussion Character
- Technical explanation, Conceptual clarification, Debate/contested
Main Points Raised
- Some participants note that the maximum range of RFID devices varies by manufacturer and specific device.
- One participant humorously suggests a maximum range of eighteen astronomical units, though this appears to be an exaggeration.
- Another participant outlines two primary factors limiting RFID range: the strength of the RF signal, which may be restricted by government regulations or power availability, and the gain and sensitivity of the receiving antenna and circuit.
- It is mentioned that improvements in RFID and ISM band low-noise receivers may affect range claims from manufacturers.
- Multi-path interference is identified as an additional factor that can degrade signal quality over longer distances.
Areas of Agreement / Disagreement
Participants generally agree that multiple factors influence the maximum range of RFID devices, but there is no consensus on specific values or limits, and some humorous claims remain unchallenged.
Contextual Notes
Limitations include potential variability in manufacturer specifications, the impact of regulatory constraints, and the effects of environmental factors like multi-path interference.
Who May Find This Useful
This discussion may be useful for individuals interested in RFID technology, including engineers, manufacturers, and researchers in the field of wireless communication.
- #2
NoTime
Science Advisor
Homework Helper
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The max range will vary by device.
The manufacturer should be able to supply this info.
The manufacturer should be able to supply this info.
- #3
chroot
Staff Emeritus
Science Advisor
Gold Member
- 10,270
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Eighteen astronomical units.
- Warren
- Warren
- #4
NoTime
Science Advisor
Homework Helper
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chroot said:
- #5
berkeman
Admin
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banerjeerupak said:
The range is limited by two basic factors. First, there will generally be some limitation on how strong of an RF signal can be used. The limitations may come in the form of government limits (like by the FCC here in the US), in order to limit RF interference with other RF devices in nearby frequency bands. Or the limitations may come in the form of how much power is available for transmission, or how (in)efficient a small transmit antenna may be, etc.
The second factor is the gain of the receive antenna and the sensitivity of the receive circuit, along with the efficiency of the receive processing string. RFID and ISM band low-noise receivers have improved over the past few years, so as NoTime says, you will need to check with several manufacturers of systems to see what kind of range they are claiming.
BTW, in addition to those two basic range-limiting factors, you also have the issue of multi-path interference, which further degrades the transfer of energy. The farther you want to go, the more multipath interference will become a hindrance.
(EDIT: fixed GSM --> ISM)
Last edited:
- #6
banerjeerupak
- 122
- 1
plenty of information i see.
i'll have to analyse if before i say anything or ask furhter
i'll have to analyse if before i say anything or ask furhter
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