(a) Explain how voltage standing wave ratio is a measure of the quality of a standing wave and state what conditions are

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A Explain How Voltage Standing Wave Ratio Is A Measure Of The Quality Of A Standing Wave And State What Conditions Are 1 (71.6 KiB) Viewed 57 times

(a) Explain how voltage standing wave ratio is a measure of the quality of a standing wave and state what conditions are needed for a perfect standing wave in a transmission line. (10%) (b) A circuit model of a piece of coaxial transmission line is shown in Figure 1. State why loss is evident in the transmission line and hence determine how any power is lost. (10%) (c) Figure 1 - Illustration of a Coaxial Transmission Line Circuit Model The transmission line in Figure 1 can be assumed to have a characteristic impedance Zo. The length of the line is a half wavelength and it allows 92% of power to transfer from port 1 to port 2. State or calculate the expected S-parameters for this two port network and determine if it is reciprocal. [20%] (d) A lossless transmission line of characteristic impedance 500 is terminated with a load of 30 +j600 at a frequency of 1.5GHz. Using a Smith chart and showing all workings on it: (i) Mark the point corresponding to the load impedance. [5 %] (ii) Find the shortest point possible from the load relative to a wavelength that will change the resistance to 5012. (15%) (iii) At the shortest point from the load found in part (i), determine how a reactive component can be used to make the impedance 500 and calculate its value. (20 %) (e) For a load connected to a lossy line such as in Figure 1, determine if the return loss will increase, decrease or not change and why. (10 %) (f) Select an expected return loss for a radio receiver input and justify your choice. (10%]