Page 260 - Antennas for Base Stations in Wireless Communications

New Unidirectional Antennas for Various Wireless Base Stations 233

Simulated Eco Measured Eco
Ex Ex
0 Hx 0 Hx
0 330 30 Hco 0 330 30 Hco
−10 −10
−20 300 60 −20 300 60
−30 −30
−40 270 90 −40 270 90 1.66 GHz
−30 −30
−20 240 120 −20 240 120
−10 −10
0 210 150 0 210 150
180 180

Eco Eco
Ex Ex
0 Hx 0 Hx
0 330 30 Hco 0 330 30 Hco
−10 −10
−20 300 60 −20 300 60
−30 −30
−40 270 90 −40 270 90 2.50 GHz
−30 −30
−20 240 120 −20 240 120
−10 −10
0 210 150 0 210 150
180 180

Eco Eco
Ex Ex
0 Hx 0 Hx
0 330 30 Hco 0 330 30 Hco
−10 −10
−20 300 60 −20 300 60
−30 −30
−40 270 90 −40 270 90 3.20 GHz
−30 −30
−20 240 120 −20 240 120
−10 −10
0 210 150 0 210 150
180 180
Figure 6.29 Radiation pattern of a T-strip coupled fed wideband unidirectional antenna

patterns are stable and symmetric across the operating band, and the
beamwidth at the center frequency of 2.5 GHz in the H-plane is 78°,
which is slightly larger than the beamwidth in the E-plane, which is
about 71°. Low cross-polar radiation and low back radiation are achieved
across the entire operating frequency band.