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A dual-beam microstrip array antenna based on conical beam elements is proposed in this paper. Circular patch operating at the TM 01 mode is used to achieve conical beam pattern. Grating lobes of the array is used to obtain dual-beam patterns with large elevation angle and high gain. Detailed analysis and design have been presented. A 4 × 4 antenna prototype has been fabricated and measured. Experimental results show that the antenna array has the return loss better than 10 dB over 12.26doi:10.2528/pierm14032601 fatcat:hzpo24ls2rcpxiqyy35tg5j7bu