WILEY ANTENNAS FOR PORTABLE DEVICES phần 7 pdf

164 Laptop Antenna Design and Evaluation

the antenna has both horizontal and vertical polarizations. The overall radiation pattern is

basically omnidirectional.

Figure 4.55 shows the measured radiation patterns at 3, 7 and 10 GHz across the UWB

on the horizontal plane when the laptop was open 90, respectively. The radiation patterns

do not change much across the bands. The average gain is about 0 dBi, quite adequate for

all standards. The laptop effects on the radiation patterns are obvious.

The measured results demonstrate that the proposed planar antenna for the UWB is

basically a variation of the monopole, and features the monopole-like radiation patterns,

which are quite consistent across the UWB band. The dips of the radiation patterns have

been observed in the direction of computer users (z-direction, referring to Figure 4.51). The

higher the frequency is, the higher the gain is.

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