Page 179 - Antennas for Base Stations in Wireless Communications

152 Chapter Four

Figure 4.14 Coverage of a three-sector high-gain antenna instal-
lation over hilly terrain: (a) single subpanel with gain G 0 dBi,
(b) dual-subpanel with gain G 0 + 3dB, and (c) tri-subpanel with gain
G 0 + 5 dB

with feed networks. This generates gain increases of 3 dB and 5 dB
relative to the standard sector antenna panel (ignoring feed network
losses), resulting in relative coverage increases of 40% and 60% in this
scenario, as given in Table 4.3. The modular high-gain antenna concept
is shown to provide link budget improvement over a large part of a
serviced cell, which shows the potential for larger site separations and
fewer installations.

TABLE 4.3 Calculated Relative Coverage Area With Different High-Gain Antenna
Configurations (subpanel with 65° and 8° azimuth and elevation half-power
beamwidths, respectively, over hilly terrain)
3
2
Antenna gain (dBi) Coverage area(10 km ) Relative coverage
0.7 1
G 0
G 0 + 3 1.0 1.4
G 0 + 5 1.15 1.6