δ ε =arctan( ε r " ε r ' ) MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdi9qqqj=hEeeu0lXdbb a9frFj0xb9Lqpepeea0xd9s8qiYRWxGi6xij=hbba9q8aq0=yq=He9 q8qiLsFr0=vr0=vr0db8meaabaGacmGadiWaaiWabaabaiaafaaake aacqaH0oazdaWgaaWcbaGaeqyTdugabeaakiabg2da9iGacggacaGG YbGaai4yaiaacshacaGGHbGaaiOBaiaaysW7daqadaqaamaalaaaba WaaubmaeqaleaacaqGYbaabaGaiaiVyIW7cGaG8kOiaaGcbaGamaix ew7aLbaaaeaadaqfWaqabSqaaiaabkhaaeaacaaMi8UaiaiVcEcaaO qaaiadaYfH1oqzaaaaaaGaayjkaiaawMcaaaaa@56D0@