To measure the exact radiation pattern and
antenna gain according to directions of the UHF
RFID reader antenna, we placed the standard antenna
in vertical and horizontal directions and turned the
antenna designed in 90o
direction. The measurements
were conducted under the four conditions.
As seen in Figure 7, when the standard antenna
was placed horizontally with the frontal side of the
antenna designed up, antenna gain with radiation
pattern as seen in Figure 8 was 9.09dBi.