Page 212 - Antennas for Base Stations in Wireless Communications
P. 212
Antenna Issues and Technologies for Enhancing System Capacity 185
z
y x
∼ ∼
∼
y
Radome
λ/4
z x Reflector Feed Point
λ/4 0.13λ
0.53λ 0.3λ 0.267λ
(a) (b) (c)
o
Figure 5.6 Structures of 120 beam antennas
Flat Reflector
Semi-Cylindrical
Reflector
90
0
120 60
−10 150 30
Normalized directivity [db] −30 180 φ = 0 [degree]
−20
−40
−30
−
20
−10 210 330
240 300
0
270
Figure 5.7 Radiation patterns
