MICROWAVE MEASUREMENT PROBLEMS (1)
Apply Smith chart to get the following line parameters if the reflection coefficient of the load is 0.4< -46Φ― and the characteristic of the transmission line is 50β¦.
(2)
The following lossy transmission line has a characteristic impedance of 50β¦ and is terminated with a horn antenna ZL = 12 + j25 β¦. Illustrate by using Smith Chart, how to determine the parameters shown on the transmission line, in oder to match the transmission line with parallel connected stub.
Ydstub1 Dstub1
Ystub1 YL
Lstub1
(3)
To ensure an optimum transmission of a signal, the impedance of a transmitted antenna must be as close as to the characteristic impedance of the transmission line Zo. As a trainee technician in Telco Sdn. Bhd, you are assigned to determine the VSWR produced in this 50 β¦ communication system. The antenna is a parabolic antenna with normalized admittance YLβ= 0.3 + j 0.6. Then, using the same Smith Chart, you need to investigate how to match the antenna to the system by using a single closedcircuit stub which is connected in parallel to the transmission line. Your answer must include TWO (2) possible stub positions and the designated stub lengths.
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