Page 292 - Antennas for Base Stations in Wireless Communications

Antennas for WLAN (WiFi) Applications 265

7.4.1 Indoor P2MP
Embedded Antenna
Figure 7.9 shows a compact
WLAN antenna design with high
manufacturability. The center
slot and the shorting pin that
is located opposite to the feed
are able to reduce the size of
the patch and lower the cross-
polarization radiation by suppress-
ing the higher order modes. 35−37
The geometry of the suspended
slot-loaded plate antenna is shown
in Figure 7.10a. A rectangular
copper plate (25 mm × 22 mm ×
0.1 mm) is placed at a height of
4 mm parallel to a ground plane
of dimensions 155 mm × 108 mm.
The medium between the radiator
and the ground plane is air and
can be supported by a foam layer Figure 7.9 A 2.4-GHz suspended plate
of e r ≈ 1.06. A narrow rectangular antenna with shorting pins and slots (Photo
slot of dimensions 1 mm × 13 mm, courtesy of Compex Systems Pte Ltd.)

x

2 2.5 0.25
2
11
6 Slot

3
1 6
y 22
6 13 6
3
6 11
2
0.25 2.5 2 Wirecut
mm
25
(a)
Figure 7.10 Embedded antenna: (a) radiator design, (b) side view
of antenna, and (c) feed design