Page 224 - Antennas for Base Stations in Wireless Communications

Antenna Issues and Technologies for Enhancing System Capacity 197

Dielectric Substrate
(e = 3.5, Thickness of 1.2 mm)
r
1.4l
Chock
1.2l

Patch
0.31l
1.7l
1.5l
Parasitic
0.45l
0.5l

(a) Structure of four-element choke loaded patch array antenna

Dielectric Substrate of Patch Dielectric Substrate of Parasitic
(e = 3.3, Thickness of 1.6 mm) (e = 3.88, Thickness of 1.0 mm)
r
r
Chock
0.3l

(b) Structure of sixteen-element choke loaded patch array antenna
Figure 5.23 Booster antennas

TABLE 5.2 HPBW and FB of Measured Results
Four-element booster antenna Sixteen-element booster antenna
HPBW FB HPBW FB
E-plane 39.8° 37 dB 25.7° 40 dB
H-plane 36.4° 32.5 dB 21.5° 40 dB