clear that the intrinsic resonance frequency fi is not changed by using any of the slot types. Fig. 4 shows the measured H-plane (x z plane) radiation patterns with the dumb-bell slot at fi = 1.49GHz andf, = 1.94GHz, respectively. fi is the matching resonance frequency of the rectangular patch with the dumb-bell slot on the ground plane. fi is the intrinsic resonance frequency of the rectangular patch without the dumb-bell slot on the ground plane, which was almost the same as the calculated resonance frequency 1.9GHz. These frequencies are used for PDC and PHS cell phone systems in Japan. 8 = 0" and fl = f180" is the z-direction, which is perpendicular to the rectangular patches. From these results, an almost omnidirectional radiation pattern with 5 dB gain variation was obtained at f i , and a bidirectional radiation pattern was obtained at fi. Therefore, the proposed microstrip antenna can realise an omnidirectional radiation pattern or a bidirectional radiation pattern simultaneously.
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