EC2353- ANTENNA AND WAVE PROPAGATIONImportant Part-B QuestionsUnit 1Electromagnetic Radiation and Antenna Fundamentals

1. Solve the wave equation for uniform plane waves in an infinitely extending conducting medium.2. What are Hertizian dipoles? Derive the electric and magnetic field quantities of infinitesimal dipole and radiation pattern.3. Explain the following parameters of an antenna: Beam solid angle Radiation pattern. Gain. Polarization. Bandwidth.4. Write short notes on antenna temperature and antenna polarization.5. Explain in detail about the antenna coupling based on reciprocity theorem.

Unit 2Wire Antennas and Antenna Arrays

1. Derive the expressions for the radiated power of half wave dipole and quarter wave monopole.2. What is broadside array? Derive expressions for the radiation pattern of a broadside array of n elements.3. What is endfire array? Derive expressions for the radiation pattern of an endfire array of n elements.4. What is broadside array? Derive expressions for the radiation pattern of a broadside array of 2 elements.5. What is endfire array? Derive expressions for the radiation pattern of an endfire array of 2 elements.6. Write a note Tchebysheff polynomial.7. Explain in detail about pattern multiplication and binomial array.

Unit 3Aperture antennas

1. With field equivalence principle explain radiation mechanism.2. Explain the radiation mechanism of slot antenna with neat diagram.3. Explain the radiation mechanism of microwave horn antenna with neat diagram.4. What is reflector antenna? With necessary diagram explain parabolic reflector antenna and its different types of feeding system.5. Write a note on lens and slot antenna.

Unit 4Special antennas and antenna measurements

1. Explain in detail about long wire and v antenna.2. State the constructional principle and design equations of rhombic antenna.3. Explain with neat sketch the construction and operation of multielement Yagi-Uda antenna.4. Discuss briefly on construction and working principle of Turnstile antenna.5. Explain the construction and operation of helical antenna.6. Explain the working of biconical antenna and derive the expression for input impedance.7. Explain the working of log-periodic array with diagram.8. Explain the radiation characteristics of microstrip antenna and mention its possible application.9. Explain in detail about gain measurement and directivity measurement.