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Abstract
The design and constructional aspects of a dissipative wall waveguide load in S-band are described. The load is fabricated for the high power microwave transmission line of 20 MeV Microtron. A mixture of cement and graphite is used as an attenuating material. A low VSWR could be obtained by providing linear taper along the length of the waveguide. Power dissipation per unit length in the load is kept almost constant and the dissipated heat is removed by circulating water. The load can be operated up to peak power of 5 MW and average power of 500 W. The VSWR of the load is better than 1.1 at the operating frequency of 2.856 GHz.