We demonstrate circularly-polarized-like modes with maximum chirality at the exceptional point (EP) of a photonic crystal (PhC) defect cavity. Reaching the EP requires a fine balance between the loss/gain and dielectric perturbation and a high consistency between fabrications and designs. In this work, we use the tunneling loss that can be controlled by the number of removed air holes in the PhC to induce the EP. By removing and repositioning the hole blocks, we make the EP insensitive to uncertainties in fabrications and improve the chirality of radiation field. Our results promote coherent chiral light sources at the chip level without auxiliary non-Hermitian and chiral structures.
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