In this letter, a novel and original configurations of highly efficient 1×3 and 1×6 beam splitters based on a photonic crystal with wide operating frequency band over the wavelength range, respectively (1.519-1.569) μm and (1.544-1.564) μm for terahertz communication applications are proposed. This is the most important results found in terms of transmission ever seen from these two devices in comparison with the literature. It is found that the efficient total transmissions of ~99.9% and 96% for the 1 × 3 and 1 × 6 splitters, respectively, with very low insertion losses at output ports are obtained around the wavelength of 1.55 μm. The simulation results confirm that the current designs can provide an efficient splitting over a broad bandwidth of ~50 nm for 1 × 3 splitter and 20 nm for the 1 × 6 splitter, respectively.