Page 174 - Antennas for Base Stations in Wireless Communications

Advanced Antennas for Radio Base Stations 147

1.6
1.4

1.2
Downlink pole capacity 0.8 1

0.6

0.4
0.2

0
−6 −4 −2 0 2 4 6 8 10 12
Downtilt (degrees)
65 High, Ericsson 90 High, Ericsson
90 High, Bell 120 High, Bell
(a)

1.6

1.4
1.2
Downlink pole capacity 0.8 1

0.6
0.4

0.2
0
−6 −4 −2 0 2 4 6 8 10 12
Downtilt (degrees)
65 Low, Ericsson 90 Low, Ericsson
90 Low, Bell 120 Low, Bell
(b)
Figure 4.11 Pole capacity in downlink as a function of electrical beam-tilt
angle: (a) high-gain antennas and (b) low-gain antennas