Novel UHF RFID Near-Field Reader Antenna with Uniform Vertical Electric Field Distribution

Figure 19

Simulated Ez distributions of the three-branch antenna at different heights when the dielectric constant is 3. (a) Z = 30 mm. (b) Z = 50 mm. (c) Z = 100 mm. (d) Z = 150 mm.

(a)

(b)

(c)

(d)