Patent ID: 7612719

Claim:
A near field RFID antenna assembly comprising a substantially linear element microstrip antenna comprising: a substrate having a thickness H; a feed point at an end region of the substantially linear element microstrip antenna; a terminating resistor at an end region of the substantially linear element microstrip antenna opposite the feed point; a linear microstrip line, the linear microstrip line electrically connecting the feed point and the terminating resistor, the linear micro strip line having a width W; the antenna configured such that: a localized electric E field emitted by the antenna resides substantially within a zone defined by the near field; the localized electric E field directs a current distribution along a length of the antenna corresponding to a half wave to a full-wave structure; an input impedance Z in ohms at the feed point is substantially equal to the impedance of the terminating resistor; and a ratio of W/H ranges from about 1 to about 5.