Page 293 - Antennas for Base Stations in Wireless Communications

266 Chapter Seven

z
6 mm
FR-4, e = 4.4, 60 mils F S 4 mm
r
G t
x
G b
Clearance Connection Connector F Feeding strip
S Shorting strip G Top ground G Bottom ground
b
t
(b)
155

47

18

12 108

54

1.5 1.3 2.9
Through-hole (for feed)
5 1.3 1
1.9

3.5
Through-hole 6.7
(for shorting strip)
(c)
Figure 7.10 Embedded antenna: (a) radiator design, (b) side view
of antenna, and (c) feed design (Continued)

with the longer sides parallel to the radiating edges of the plate, is sym-
metrically cut at the center. Another two slots that are symmetrical and
orthogonal with respect to the center slot are also formed by wire-cut.
The copper sections from the wire-cuts can be bent inward, which will
act as the feeding strip and the shorting strip, each measuring 3 mm ×
4 mm and separated by 6 mm. The additional section with a 2-mm
width that is attached to the feeding strip will go through the hole of
the same size on the ground plane in order to ensure that the height
is controlled precisely at 4 mm. The feed point is located on the bottom