ii If the characteristic impedance of the transmission line is 20 \u03a9 and the AC

Ii if the characteristic impedance of the

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ii)If the characteristic impedance of the transmission line is 20 Ω and the AC signal has a frequency of 50 Hz, what is the input impedance seen at the Liverpool side? iii)If the characteristic impedance of the transmission line is 20 Ω and the AC signal has a frequency of 10 kHz, what is the input impedance seen at the Liverpool side? iv) Use the results obtained from Questions Q1b-i) to Q1b-iii) to explain why the characteristic impedance is generally a very important parameter at high frequencies, but not so important at low frequencies. 5 Total 35
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The numbers in the right hand margin represent an approximate guide to the marks available for that question (or part of a question). Total marks available are 100. PAPER CODE ........ ELEC311 ............ PAGE ..4 ................... OF .... 11 ........................... CONTINUED
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Q2.a)i)A lossless microstrip transmission line has a characteristic impedance of 50 Ω. If the length of transmission line is doubled, what will be the characteristic impedance of the microstrip line? Justify your answer. ii) A lossless transmission line has a characteristic impedance of Z 0 = 70 Ω and a phase constant of β =2 rad/m at 1 GHz. Calculate the values of the primary constants R , G , L and C of the line. 10 b) Find the scattering parameters of a parallel impedance Z a = 50 Ω connected in a two-port 50 Ω system, as shown in figure Q2b. Figure Q2b 10 c)
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  • Fall '18
  • JIAFENG
  • Electromagnet, Transmission line, long transmission line, Elec 311

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