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2006-1 중간고사문제(안테나공학)
 

2006-1 중간고사문제(안테나공학)

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    2006-1 중간고사문제(안테나공학) 2006-1 중간고사문제(안테나공학) Document Transcript

    • 2006 mid-term examination (110) Antenna Engineering Date: October 26, 2006.1. Calculate the following parameters of a Hertzian dipole antenna with I = 700 [mA] , ∆z = 0.3 [mm] , f = 13 [GHz]. (90) 1)E-field [V/m] and H-field [A/m] at r = 13 [m] , θ = 50  , φ = 90  (20) 2)Radiation power [dBm] and resistance [ Ω ] (20) Hint:) dBm = 10log10 ( P / 1 [mW ]) 2π 3)Input impedance and equivalent circuit with Z 0 = 75 [Ω] , β = k = λ (30) j Hint:) Z open = − R ωC , = radiation resistance 4)Draw the input impedance point for 3) on the Smith chart. (10) 5)Compare a Hertzian dipole antenna and a half-wave dipole antenna in terms of a resonance. (10)2. Explain how an antenna radiates an electromagnetic wave in terms of a current density J , a vector potential A . Do not use any formula in the textbook. (20)