Page 242 - Antennas for Base Stations in Wireless Communications

New Unidirectional Antennas for Various Wireless Base Stations 215

Perspective view

G W
P
P L W
z L L
y
x Vertical Feeding
plate pair edges
G L
Ground plate

Front view
s Patch

z d
Vertical W v h p
plate g
x
y
SMA
launcher W H
Side view
L

z
M W v M
t
x
y
SMA
launcher
All parameter unit in mm
P w P L G = G W h p L M W H W V S g d t
L
60.0 68.0 350 16.0 43.0 12.5 7.5 13.5 26.0 11.0 20.0 2.5
(0.43l ) (0.49l ) (2.53l ) (0.12l ) (0.31l ) (0.09l ) (0.05l ) (0.10l ) (0.19l ) (0.08l ) (0.14l ) (0.02l )
0
0
0
0
0
0
0
0
0
0
0
0
50
Figure 6.7 Geometry of the proposed DFPA driven by a vertical-plate pair (© 2007 IEEE)
For the sake of feeding the antenna with a differential signal, a wide-
51
band 180° power divider, which was introduced in Itoh and Cheng,
was utilized to transform a single-ended signal to two signals, in which
one travels out-of-phase with the other. As described in Figure 6.8, the
two output ports of the divider are designated as Port 2 and Port 3.
Port 2 and Port 3 are then connected to the antenna via coaxial cables.