“Unconventionally Shaped” Antenna Design for UHF RFID Tags

Table 1

Letter geometry can be categorized into 9 groups.

Categories	Characteristic
U CVG	Structure of concaved shapes
P ODQ	Structure with a single loop
E BF	Structures with “T” shapes embedded
M KW	Symmetrical structures with bended arms
S ZN	Line structure with two turns
H X	Structures with four arms, symmetrical both vertically and horizontally
J L	Line structure with one turn
Y A	Symmetrical in one dimension
T I	T and I structure can be used as the baseline structure of other variations

Note: we chose one letter shape from each of the 9 groups as the antenna template, as marked in bold text.