Page 214 - Antennas for Base Stations in Wireless Communications

Antenna Issues and Technologies for Enhancing System Capacity 187

: Current flow

(a) 0.8-GHz band (b) 1.5-GHz band (c) 2-GHz band
Figure 5.9 Current flow of a triple frequency-band antenna

: Required value
0
Return loss [dB] −10

−20

−30

0.5 1 1.5 2 2.5
Frequency [GHz]
Figure 5.10 Return loss response against frequency

180

Beamwidth [degree] 140
160

120

100
0.5 1.0 1.5 2.0 2.5
Frequency [GHz]
Figure 5.11 HPBW of triple frequency-band antenna