Advantages of Using Dual frequency card?

We provide dual frequency cards with a pair of passive RFID chips that allow it to communicate in two different frequency ranges simultaneously. The cards are combination (combi cards) in UHF-HF, UHF-LF, HF-LF, with HF inlay being complaint with NFC applications.

UHF+HF dual frequency cards are becoming increasingly popular in loyalty and payment schemes that also want to track time & attendance and location of customer. These hybrid cards generally have the UHF chip placed separately above or the side of the UHF chip to ensure there is no interference.

UHF+LF dual frequency cards are used in specialized situations where simple access control is required alongside personnel tracking. LF+UHF twin cards are generally accomplished with the LF antenna running above or beside the UHF antenna.

HF+LF dual frequency cards are the most common used than other two combi cards in our life. They have an LF antenna laminated around the outside of the card with a thick coil LF antenna contained within. Legacy LF systems like HID prox are often replaced by higher security HF implementations that still require usage of the original LF chip while all sites convert to the newer HF standard.

These dual frequency cards feature a durable IP68 construction and are available also in other materials for extended temperature ranges. Customization services include various type of printing, single card printing, numbering, slot punching and magnetic stripe.

http://www.nfcandrfid.com/products_info/Dual-frequency-card-319972.html