A novel directional microstrip quasi Yagi array antenna is proposed to achieve a wide bandwidth with a low profile and a compact structure. The array is composed of a driven circular sector and annular sector directors. Arrays with both a single director and also with a dual director have been studied. Measured results show that the proposed antenna provides a stable high gain in a wide bandwidth with a low profile of 1.5mm (0.03 λ 0 at the 5.8 GHz). For an array using a single annular sector director, an impedance bandwidth of 13.6% (5.10 GHz -5.85 GHz) is achieved with a peak gain of 8.2 dBi. With two annular sector directors, the bandwidth is improved to 17.6% (5.05 GHz -6.02 GHz), and the peak gain is 10 dBi.Index Terms -patch antenna, directive antenna, quasi Yagi array, annular sector.

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