This article presents a novel structure of integrated radio frequency（RF） internal calibration line for patch antenna without increasing the antenna profile. The RF internal calibration line is realized by introducing a microstrip line in the middle of the nonradiation side of the two patch antenna units. Metalized grounding strips (MGS) are composed of metal strips on the upper surface of printed circuit board, metalized ground vias, and the ground layer. The MGS with gaps is set between the calibration line and the antenna units to adjust the mutual coupling. A 16 × 32 antenna array is fabricated and measured for verification. The measured results are in good agreement with the theoretical simulation. It shows that the mutual coupling between the coupling port of the calibration line and each port of the antenna unit is between −32.5 and −27 dB in the X and Ku frequency band (12–13.2 GHz, 9.5% relative bandwidth), and the antenna pattern is not distorted by the integrated calibration lines.
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