試題詳解

39. Figure 5 shows a power divider of power ratio PL₁/PL₂ =1, where P_L1 and P_L2 are the power delivered to the loads Rei and Riz, respectively. The loads have resistance RiI = 750 and R_L2 = 300 , and the characteristic impedance of the transmission line is Z₀ = 50 Ω . Find the characteristic impedances Z₁ and Z₂ of the quarter-wavelength transmission linesso that the impedance is matched from the source.

(A) Z₁=61.2Ω,Z₂ = 122.5Q；
(B)Z₁= 122.5Ω, Z₂=61.2Ω；
(C)Z₁=86.62Ω,Z₂=173.2Ω；
(D) Z₁= 173.2Ω,Z2 =86.6Ω；
(E) It is impossible to match the loads by using the quarter-wavelength transformers.