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A design of a stacked microstrip patch antenna and a 16-element array on Ferro A6-M LTCC operating at W-band is presented. A parasitic patch is added on LTCC substrate to increase bandwidth. The stacked configuration is designed by using an equivalent circuit together with EM simulators. The manufactured antenna array is integrated with a WR-10-to-microstrip-line transition to facilitate RF testing. The S-parameters are measured on a probe station and radiation pattern testing is done using a WR-10 excitation in anechoic chamber. The array of size 9.3 mm × 9.3 mm × 0.4 mm has the measured maximum gain of 14.2 dBi at 84 GHz and gain higher than 11.2 dBi between 78.5 GHz and 98.5 GHz which results as -3-dB radiation bandwidth of 23%. The antenna efficiency of the array is 48% at the highest.