|Minimum Order Quantity||01 Piece|
|Range (feet)||5 to 15 Feet|
If you have ever used an access card to get into a building or your car or passed through an automated toll collection system on a highway, you have used RFID. The definition of RFID is rather broad because it has so many uses. Let's first start with the acronym and what it means:
RFID = Radio Frequency I Dentification
Now, let's break down what this means: a system of technologies that allows an object, person or animal to wirelessly identify itself to another object, person or animal. Hence the words RF (Radio Frequency) and ID (IDentification).
To be able to do this in so many usage scenarios, form factors, price points, thermal environments, et cetera, the technology used for enabling RFID takes many forms. The most common ways of subdividing the technology are by frequency and whether or not the tag is a passive device. Let’s first look at the frequency: at the lowest common frequency or LF (Low Frequency), this spans the range of 58-148.5 kHz or 58-148.5 thousand cycles per second. This frequency allows for low cost tags and readers with short read range (several inches to several feet), but most importantly, this frequency allows the RF to transmit through metals a few mm thick and liquids. This makes this technology very suitable for implanting into animals, but also for access control and electronic article surveillance (EAS) or antitheft applications. Now, one can't easily implant a battery along with the antenna and chip in animals or consumer goods, so the tags are read passively. The behavior of the tag changes an incident RF field in a way that a reader can detect a unique ID. This ID may be a single bit in the case of an EAS tag or up to 10s of bits for animal tags.
The next frequency range spans from 1.75-13.56 MHz and is the next most common use of the technology. This frequency range is called HF, or High Frequency, and includes tags for use in building access, public transportation and electronic payment systems. The range of these systems is similar to LF: inches to feet, depending on the application. HF tags also work pretty well with metals and liquids. Except for electronic article surveillance, HF tags are usually used for proximity applications: a human gesture of moving one's arm, wallet or purse is used to provide access or payment.