3.3.2 Radiation characteristics

The simulated and measured results of E-plane and H-plane for the high gain antenna at f1 and f2 are shown in Figure 17(a) and (b), respectively. The measured values of gain, radiation efficiency, F/B ratio, cross polarization level, 3 dB angular beamwidth at the first resonance frequency (f1) are 8.3 dBi, 90%, 12, 22.3 dB, 73.5° , respectively. While at the second resonance frequency, these values can be summarized as 7.8 dBi, 91.6%, 26, 21.6 dB, 79.5° , respectively. The gain and radiation pattern of the antenna were measured by the Anechoic Chamber shown in

Figure 18. Antenna radiation pattern measurement set-up.

Figure 18. There is a good agreement between the simulated and measured results of the radiation characteristics.
