Page 259 - Antennas for Base Stations in Wireless Communications

232 Chapter Six

8

7

6

5
SWR Simulated
Measured
4
3

2

1
1.5 2.0 2.5 3.0 3.5 4.0
Freq/GHz
Figure 6.27 Measured and simulated SWR for a T-strip fed wideband unidirectional
antenna

bandwidth of 63% (SWR ≤ 2) from 1.66 to 3.20 GHz. Figure 6.28
illustrates the measured and simulated gain curves of the antenna.
From this, we can observe that the proposed antenna has a gain varying
from 6.8 dBi to 8.2 dBi across the operating band. The radiation pat-
terns at frequencies of 1.66, 2.5, and 3.2 GHz were measured and are
shown in Figure 6.29. For both E- and H-planes, the broadside radiation

10
9
8
7
6
Gain/dB 5

4
3
2
Simulated
1
Measured
0
1.5 2.0 2.5 3.0 3.5 4.0
Freq/GHz
Figure 6.28 Measured and simulated gain for a T-strip fed wideband
unidirectional antenna