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A squeezed triangular lattice photonic crystal fiber (PCF) composed of elliptical air holes is presented in this paper. Full vector finite element method (FEM) is used to investigate the guiding property. By adjusting the size of air holes in cladding, the fiber offers a flat negative dispersion of -1343.46 ± 6.74 ps/(nm.km) over the wavelength bands of S+C+L+U. The birefringence can be on the order of 1 0 − 2 which reaches up to 3.72 × 1 0 − 2 at the wavelength of 1. 55 μ m. The proposed PCF may show some important applications in residual dispersion compensation and polarization maintaining fibers. [ABSTRACT FROM AUTHOR]