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This paper proposes a high-gain microstrip antenna employing stacked rings that uses a multi-layer high temperature co-fired ceramic (HTCC) substrate for a millimeter-wave system-on-package. The design and performance of the proposed antenna are described. The proposed antenna achieves the antenna gain of 15.7 dBi and its radiation efficiency is greater than 85.5%. This paper presents a 60-GHz band prototype antenna employing a multi-layer HTCC substrate that is well suited to achieving a low cost module. The measured performance of the prototype antenna is also described.