A technique to design a wideband low profile microstrip patch antenna is presented in this paper. The proposed antenna consists of a tooth-like-slot patch and an inset feeding microstrip line. Two resonant modes are excited to broaden the bandwidth with the total substrate thickness of only 0.033λ0. The antenna and a 2×2 array operating at 10GHz are fabricated with printed circuit board process. The prototypes with single element achieve a bandwidth of 10.5% for −10dB return loss and a gain of 9.4dBi while the 2×2 array achieve a bandwidth of 10.6% and a gain of 15.1dBi. The proposed antenna exhibits low profile, low fabrication cost, easy integration with planar circuits and still retains the advantages of high gain and wideband.
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