A Highly Compact Double-Sided Orientation Insensitive Chipless Tag for Radio Frequency Identification Applications

In this paper, a simple highly compact orientation insensitive frequency-domain strip-based chipless RFID tag design is presented. To achieve the compactness of the tag, resonating copper strips are placed on the front side as well as on the back side of the substrate. In this way, the overall 50% reduction in the tag size is achieved. The proposed tag is design using Roger's RT5880LZ, that has an overall size of 12x12 mm(2). The tag is capable of encoding 16-bits within a frequency band of 5.7 to 19 GHz. The performance of the tag at different oblique incidence angles show that it is angularly stable for up to 75 degrees. The proposed tag achieves a high code density of 11.11 bits/cm(2) and is readable from the front and back side of the tag.