Fig. 4 is the measured 2D pattern at 2.4 GHz. According to
the measured data, the gain on the xy-plane was
approximately 6.47 dBi, that on the zy-plae was
approximately -1.77 dBi, and that on the zx-plane was
approximately 6.3 dBi. Based on the three patterns, the
proposed omnidirectional high-gain dual-mode dipole antenna
showed a tendency towards directivity at 2.4 GHz.