Page 132 - Antennas for Base Stations in Wireless Communications

Antennas for Mobile Communications: CDMA, GSM, and WCDMA 105

First null
First lobe
0.0 Second null
Main beam = 0°
30.0 30.0 Second lobe
Third null
Third lobe
Fourth null
60.0 60.0
Fourth lobe
Upper sidelobe

(180–ϕ) ϕ
0.0 −10.0 −20.0 −30.0 −30.0 −20.0 −10.0 0.0

First First Second Second Third Third Fourth Fourth
null lobe null lobe null lobe null lobe
−9.8dB −9.2dB −14.8dB −14.7dB −20.7dB −18.5dB −31.0dB −27.5dB
3-dB beamwidth in horizontal plane = 74.6° 3-dB beamwidth in vertical plane = 8.1°
(d)

First null
First lobe
0.0 Second null
Main beam = 0°
30.0 30.0 Second lobe
Third null
Third lobe
Fourth null
60.0 60.0
Fourth lobe
Upper sidelobe

(180–ϕ) ϕ
0.0 −10.0 −20.0 −30.0 −30.0 −20.0 −10.0 0.0

First First Second Second Third Third Fourth Fourth
null lobe null lobe null lobe null lobe
−10.0dB −9.2dB −15.0dB −15.0dB −20.9dB −18.2dB −28.0dB −17.2dB
3-dB beamwidth in horizontal plane = 72.3° 3-dB beamwidth in vertical plane = 7.6°
(e)
Figure 3.5 Simulated radiation patterns of the eight-element shaped beam antenna
7
array at (a) 1.71 GHz, (b) 1.83 GHz, (c) 1.94 GHz, (d) 2.06 GHz, and (e) 2.17 GHz
(Continued)