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Transponder basic features
- There is not an ideal transponder for any application!
Depending on the application requirements, there are different transponder formats: round or rectangular;
rigid or flexible; medium or small size; water or temperature resistant;
complying with secure or plain communications standards.
- The rigid transponders are nowadays well known, mostly used in low frequencies applications (ISO 18000-2).
The flexible ones are more recent (ISO 18000-3, ISO18000-6),
Cheaper and therefore suitable for high volume applications. The basic assembly process consists of: a metallic
antenna is layed on a substrate material of a few micron thickness, the chip is connected to the antenna and a protective
overlay is suitably added to allow the tag to support some of the physical conditions found in many applications like abrasion,
impact and corrosion.
For the lamination several types of material can be used: different types of papers; thermo-plastic polymers, polyvinylchloride
(PVC), polyester (PET), polyamide (PA), polyethylene (PE), polypropylene (PP). Sometimes, some special coatings are made
on the surface, in order to allow the printing (black and white or full colour).
- One of the main ways of categorizing RFId tags is by their capability to read and write data.
In the simplest types of tags the data, usually a simple ID number, is written only once into the tag during manufacture;
the memory is then disabled for any further update. The most flexible allows the users to read and write data into the
tag memory and therefore it is provided with different memory capacities depending on the application.
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