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This pap e r is concerned with the investigation of th e e ffects of a magnetoplasma layer on the radia· tion prope rties of an infinite axial slot on a circular cylinder when a finite magnetostatic field is in th e axial direction. Formulas have been obtained for th e field s e ve rywhere around th e cylinder and for any thi c kness of the magnetoplas ma. The solution is simplifi e d by a first orde r approximation , valid only for s mall thic knesses of the laye r. For a s mall " koa" the harmonic series converges we ll and is used for numerical co mputations . For large "koa" the conve rge nce is improve d by applying th e Watson's tran s formation . Di s torti on, attenuation, and asymmetry of th e radiation pa tte rn are shown as a function of the s tre ngth of th e magne tos tatic fi e ld . It is found th at th e reve rsa l of th e ori e ntati o n of th e magnetos tati c fi eld produ ces a s hift of the patt e rn to a mirror.image position.

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