▁along ▁the ▁wire ▁without ▁loss ▁of ▁power . ▁He ▁form ulated ▁the ▁general ▁requirements ▁and ▁principles ▁of ▁the ▁building ▁of ▁broad band ▁anten nas , ▁discovered ▁and ▁described ▁the ▁phenomen on ▁known ▁as ▁" fe eder ▁echo ." ▁T ogether ▁with ▁A . A . ▁P istol k ors ▁he ▁developed ▁the ▁theory ▁of ▁a ▁direct ▁measurement ▁of ▁the ▁travel ing ▁wave ▁in ▁the ▁feed ers ▁and ▁created ▁the ▁appropriate ▁meas uring ▁devices , ▁so ▁called ▁" fe eder ▁reflect om eters ". ▁ ▁In ▁the ▁late ▁ 1 9 4 0 s , ▁Ne iman ▁developed ▁the ▁theory ▁of ▁electronic ▁modes ▁of ▁tri ode ▁and ▁t etro de ▁gener ators ▁at ▁high ▁angles ▁of ▁electron ▁span ▁and ▁large ▁v ibration ▁amplit udes . ▁His ▁mon ograph ▁" Tri ode ▁and ▁t etro de ▁mic row ave ▁frequency ▁gener ators " ▁was ▁awarded ▁the ▁St alin ▁Prize ▁of ▁the ▁ 3 rd ▁degree ▁in ▁ 1 9 5 1 ▁and ▁published ▁also ▁in ▁German ▁and ▁Chinese . ▁ ▁In ▁the ▁ 1 9 5 0 s ▁and ▁ 1 9 6 0 s , ▁Ne iman ▁proposed ▁the ▁new ▁principle ▁for ▁broad band ▁anten nas ▁free ▁from ▁the ▁reflection ▁phen omena ▁and ▁called ▁" ant enn as ▁of ▁smooth ▁radiation ", ▁and ▁also ▁the ▁new ▁method ▁of ▁calculating ▁the ▁power ▁and ▁radiation ▁resistance ▁of ▁met all ic ▁anten nas ▁based ▁on ▁the ▁calculation ▁of ▁emission ▁of ▁electrons ▁moving ▁in ▁metal . ▁He ▁generalized ▁the ▁theory ▁of ▁cont ours ▁and ▁lines ▁on ▁the ▁v