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This paper proposes a novel multi-layer parasitic microstrip array antenna (MPMAA) structure for compact and low-cost quasi-millimeter-wave and millimeter-wave system-on-package modules. The design and performance of the proposed array antenna are described. The developed prototype MPMAA employs a multi-layer low-temperature co-fired ceramic (LTCC) substrate that is well suited to the assembly of MMIC chips. The fabricated MPMAA exhibits a -16 dB return loss and a 50-degree 3-dB beam width at 25 GHz. The spacing of the top layer of the parasitic array constructed by 2 Ã 2 elements has a free space wavelength of 0.37. The fabricated MPMAA realizes both compact and high directional gain.