During the propagation of pulse signal in dielectric waveguide Fast Pulse Guided Wave is forming. This wave propagates at the head of pulse signal in the waveguide and has rhombus-shape field distribution inside the dielectric with inclined like-Cherenkov wave front. Another part of this wave propagates near the dielectric surface in free space with the speed of light in free space. The rhombus shape structure inside the rod also propagates with the speed of light in free space. Fast Pulse Guided Wave is similar to some mode in the waveguide, however it doesn’t save own field distribution in different cross-sections. The goal of this paper is considering the plane wave diffraction at the taper dielectric rod (receiving rod antenna) and investigation of the Fast Pulse Guided Wave excitation in dielectric waveguide in this case. As a calculation method BOR-FDTD technique was used.