gainloss 1132020 5 radio spectrum 1132020 7 ground Slides: 27 Download presentation 訊號的增益(gain)與減損(loss) 11/3/2020 5 無線電頻譜(radio spectrum) 11/3/2020 7 地球上的電磁波 ¡ 地面波的傳遞(ground wave propagation) ¡ 大氣波的傳遞(sky wave propagation) ¡ 視線(line-of-sight)的傳遞 11/3/2020 8 電磁波的傳遞機制 ¡ 繞射(diffraction, 或稱shadow fading) ¡ 散射(scattering) ¡ 反射(reflection) ¡ 折射(refraction) 11/3/2020 9 Fresnel zones的觀念 11/3/2020 12 都卜勒效應(Doppler effect) 11/3/2020 15 頻道的散佈特性(dispersive characteristics) 因多路徑 符號間的干擾! 11/3/2020 17 AP與天線的連接 11/3/2020 19 訊號(signal)強度的表示法 11/3/2020 21 訊號(signal)強度的表示法 11/3/2020 22 訊號(signal)強度的表示法 11/3/2020 23 訊號(signal)強度的表示法 11/3/2020 24 幅射主體(intentional radiator) 與EIRP (equivalent isotropically radiated power) 指實際上天線本身所幅射的 功率,FCC針對幅射主體與 天線本身的功率輸出都有明 確的規範。 11/3/2020 25 Weakness of bohr's atomic modelAbsorption spectrumWavelength chartAwin radioPhylum polypodiophytaEileen craytonExamples of team chartersChad ostlundGround rules in a classroomExample of horizontal measurementWhat conducts power and ground to the driver's side airbag?Virtual ground opampGao cost estimating guideProgramming from the ground upGround rules for focus groupsCommon ground theoryGround bond testingWater that doesn't soak into the groundWhat is ground distance in geographyElectron configuration rulesFrom the ground up pokerNon symmetric projectile motionChapter 5 projectile motionI am pressing on the upward wayPeer ground motion databaseTreponema pallidumDifference between shells and orbitalsElectron configuration of o+