# antenna theory homework help

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• Q1: Problem 3. (15 points) Design the lag compensator such that you achieve the both re-requirements. D_{c}(s)=\frac{T_{i} s+1}{\alpha T_{i} s+1} where a > 1. Use K you designed in Prob. 1. Provide the Bode plot of the open-loop with the stability margins. You will need iterations to find the correct T; and a.See Answer
• Q2: Problem 2. (15 points) Design the lead compensator such that you can achieve the both requirements. D_{c}(s)=\frac{T_{d} s+1}{\alpha T_{d} s+1} where a < 1. Use K you designed in Prob. 1. Provide the Bode plot of the open-loop with the stability margins. You will need iterations to find the correct max and maxSee Answer
• Q3: There is a requirement to design a digital broadcast transmission system that uses QuadratureAmplitude Modulation (QAM) and Orthogonal Frequency Division Multiplexing (OFDM). a) Explain with the aid of diagrams how QAM encodes and decodes data and explain the difference between data rate and symbol rate.(8 marks) b) Explain with aid of diagrams why Orthogonal Frequency Division Multiplexing (OFDM)would be a suitable modulation scheme for a digital broadcast transmission system and why the symbol duration is an important design consideration?(8 marks) c) If the transmission system was capable of transmitting 64kbps with a symbol rate of 4ms.(Please show and explain all calculations for the following): Determine and justify the number of OFDM carriers. b. Explain and justify the QAM encoding level required to achieve the above.See Answer
• Q4:1- When a cable carries multiple currents, all in the same direction, this would be associated with which coupling mode? Select one: A. Differential mode B. Common mode C. Antenna mode D. Common impedance E. None of the above 2- Interference at the source can be reduced by: Select one: A. Low noise design B. Shielding C. Decoupling D. Filtering E. All of the above 3- Shielding for magnetic fields at low frequency can be done with: Select one: A. Purely conductive material B. Aluminium C. Copper D. A high-permeability material such as mu-metal or its derivatives E. B & C 4- In hazardous areas, one would be more inclined to consider Select one: A. both the upper and lower explosive limit B. the lower explosive limit C. the upper explosive limit D the upper flammable limit 5- An instrument is to be mounted in a hazardous area. If it is marked T2" (maximum surface temperature of 300°C). Select one: A. it is safe to be used with gasses and vapours that have an ignition temperature greater than 300°C. B. it is safe to be used with gasses and vapours that have an ignition temperature lower that 300°C. C it can only be used with gasses and vapours whose ignition temperature is 300°C. D. it is unsafe as it gets too hot 6- ATEX 100a European Directive deals solely with Select one: A. the minimum requirements for improving the safety and health protection of workers potentially at risk from an explosive atmosphere B. the zone classification of a hazardous area C equipment and protective systems intended for use in potentially explosive atmospheres D. the IEC Standard to which equipment is certified 7- Who, generally speaking, is held responsible for the appropriate explosion protection safety of any given installation? Select one: A. The installer B. The equipment supplier C. The certifying authority D. The plant owner 8- HAZOPS work best if they are conducted Select one: A. when the P&IDs have been finalised, but before detailed design has commenced B. at any time. They are not influenced by P&IDs C. over beer and pretzels D. before the P&IDs have started 9- Which of the following listed certificate numbers would be for an equipment which has special conditions for installation of operation? Select one: A. BASOSATEX1234 U B. PTB07ATEX1784X C. SIRA09ATEX0645/1 D. CESI08ATEX1323See Answer

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