2. (a) State the expected return loss of a filter at the 3dB cut off and note any necessary assumptions. (10%) (b) Sugge

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2 A State The Expected Return Loss Of A Filter At The 3db Cut Off And Note Any Necessary Assumptions 10 B Sugge 1 (74.77 KiB) Viewed 51 times

2. (a) State the expected return loss of a filter at the 3dB cut off and note any necessary assumptions. (10%) (b) Suggest why a high order Chebyshev filter even with ripple would be more favourable than a Butterworth filter to allow more consistent attenuation within the pass band. (10%) (c) State an effect that may occur if the pass band of a filter gets too wide and why. (10%) (d) Design a filter with a centre frequency of 300MHz that will have a pass band of 10MHz but attenuate any signals by more than 25dB at 330MHz based on a characteristic impedance of 5002. You may only use three reactive elements and you must ensure minimal attenuation at the cut off. You should ensure you sketch a schematic circuit of your filter design and show clearly all calculations of the element components. [20%) le) (f) On a Smith chart, mark the point where the centre frequency of the designed filter in part (d) for either port would be. Draw a region within which the pass band frequencies would be and justify your answer with any necessary calculations. [20%) For the filter designed in part (d), mark on the same Smith chart a position you expect to find for a very low frequency close to direct current (DC). Justify your answer. (10%) Explain why the designed filter in part (d) can be considered a direct connection between two transmission lines at the centre frequency. State how the filter components work to achieve this. (10%) Give a reason why an even number of reactive elements is less favourable in Chebyshev filter designs. (10%) (g) (h)