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The complete design of high power coaxial high pass filter is given analytically and numerically. The coaxial structure consists of two hollow concentric cylinders with a septum located between them at a single azimuthal angle. This septum provides a good high pass filter characteristics and mechanically holds two hollow cylinders together. The attenuation slope in the stop band with this structure is much sharper than the existing filter configurations. This gives faster transition time from stop band to pass band. One end of the coaxial structure is closed and the other end is used as an output port. Excitation port is placed on the side walls of the outside cylinder. The design procedure proposed in this paper has been implemented to obtain a filter configuration at UHF. The new filter is simulated using 3D electromagnetic simulator. Results are then compared with the measured results. Good agreement has been observed between the simulated and measured results.