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CHAPTER2FundamentalParametersofAntennas2.1INTRODUCTION...........................................................................................................................32.2RADIATIONPATTERN................................................................................................................32.2.1RadiationPatternLobes........................................................................................................52.2.2Isotropic,Directional,andOmnidirectionalPatterns............................................................72.2.3PrincipalPatterns..................................................................................................................72.2.4FieldRegions.........................................................................................................................92.2.5Radian（弧度）andSteradian（立体弧度）....................................................................132.3RADIATIONPOWERDENSITY................................................................................................152.4RADIATIONINTENSITY...........................................................................................................20中国科学技术大学——朱旗2.5BEAMWIDTH..............................................................................................................................222.6DIRECTIVITY..............................................................................................................................252.6.1DirectionalPatterns............................................................................................................352.7ANTENNAEFFICIENCY............................................................................................................402.8GAIN.............................................................................................................................................442.9BEAMEFFICIENCY.........................................................................
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