Page 139 - Antennas for Base Stations in Wireless Communications

112 Chapter Three

90
0
120 60
−5
−10
−15
150 −20 30
−25
−30
−35
180 −40 0
0 −5 −10 −15 −20 −25 −30 −35 −40 −35 −30 −25 −20 −15 −10 −5 0
−35
−30
−25
210 −20 330
−15
−10
−5 Horizontal plane co-pol
240 300 Vertical plane co-pol
0
270
(a)

90
0
120 60
−5
−10
−15
150 −20 30
−25
−30
−35
180 −40 0
0 −5 −10 −15 −20 −25 −30 −35 −40 −35 −30 −25 −20 −15 −10 −5 0
−35
−30
−25
210 −20 330
−15
−10
−5 Horizontal plane co-pol
240 300
0 Vertical plane co-pol
270
(b)
Figure 3.11 Measured radiation patterns of the 90° linearly polarized antenna array
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without slotted sidewalls at (a) 0.824 GHz, (b) 0.892 GHz, and (c) 0.96 GHz (© 2005 IEEE)