Broad-Band Impedance Matching into Dielectric-Filled Waveguides

The problem of impedance matching between two waveguides filled with different dielectrics is discussed, and the conditions for broad-band matching are determined. Experimental results are presented for standard waveguides matched to guides filled with dielectrics having permittivities /spl epsi/ as high as 100/sub epsi0/. Present applications include matching devices for X-band coupled-cavity transmission masers which employ ruby and alumina sections (/spl epsi/ /spl ap/ 10/sub epsi0/) . Future applications include matching devices for masers utilizing rutile (/spl epsi/ as high as 250/spl epsi0/).