Page 256 - Antennas for Base Stations in Wireless Communications

New Unidirectional Antennas for Various Wireless Base Stations 229

G L
S L

Copper plate d W

G W
Ground plane
z
y
Feed to SMA connector
x
Perspective view

T 1

T 2

Copper T-strip
1 mm

Copper plate
H Air, e 0 z

x
Ground plane
SMA connector

Side view

Parameters T 1 T 2 d H L S W G L G W
Value/mm 9.5 (0.079l) 27 (0.225l) 4.91 (0.040l) 30 (0.25l) 30 (0.25l) 17 (0.141l) 60 (0.5l) 160 (1.3l) 160 (1.3l)
Figure 6.23 A wideband unidirectional antenna with a T-strip coupled feed

is the same as the microstrip line, is 4.911 mm. The whole antenna is
made of 0.3-mm-thick copper plates and its ground plane is made of an
aluminum plate 160 mm × 160 mm with a 2-mm thickness.
Similarly, the configuration of the proposed antenna fed by a square-
cap is illustrated in Figure 6.24. For this antenna, the microstrip line
has a vertical length of 24 mm and a horizontal length of 12.5 mm.
The end of the vertical line is connected to the SMA connector, while
the horizontal portion is associated with the metallic square-cap, which
has a length of 10 mm.