MICRO WAVE AND SATELLITE COMMUNICATION

UNIT 1 RADIO WAVE PROPAGATION  SHORT ANSWER QUESTIONS : 1) Which layers of ionosphere exists in day time and night time? 2) Define EM wave ? effects of environment on EM wave (reflection, refraction,diffraction and                  interference) 3) Limitations of ground wave? 3) Factors affect space wave propagation ? 4) Define refractive index , phase velocity? 5) Define reflection coefficient , actual height ? ESSAY QUESTIONS : 1) Explain ground wave propagation with applications ? effects on ground wave propagation? 2) Explain sky wave propagation? short notes on layers of sky wave ? 3) Space wave propagation with applications ?  4) Define a) Skip distance b) field strength c) virtual height d) MUF e) critical frequency 5) Short notes on i) DUCT propagation   ii) Tropospheric scatter propagation

 UNIT 2  ANTENNAS SHORT ANSWER QUESTIONS : 1) State the parameters of antenna ? 2) Define iso-tropic antenna ? 3) Radiation pattern of antenna ? 4) Half wave dipole radiation pattern? 5) Classify antenna based on frequency, radiation, application , construction? 6) State different microwave antennas ? 7) Different horn antenna types ? application of horn antenna ? 8) Need for folded dipole? 9) Difference between end fire & broad side array? 10) Functions of 1)driven element 2)parasitic element 3) reflectors 3)directors 11) Different types of antenna arrays ? ESSAY QUESTIONS : 1) a) Need for antenna array?     b) Explain end-fire and broadside array ? 2) Working principal of Dish antenna & applications  3) Working principal of Horn antenna?advantages and disadvantages ? 4) Explain Radiation mechanism of antenna from transmission line theory ?(single wire , two wire) 5) Describe the functions of dipole , folded dipole antenna? Give their applicati...

 UNIT 3  MICROWAVE COMPONENTS AND DEVICES  SHORT ANSWER QUESTIONS : 1) Define microwave ? state different microwave frequency bands ? 2) Advantages and applications of microwave? 3) Define wave guide? 4) Advantages and applications of wave guide ? 5) State the functions of wave guides and classify them ? 6) Short notes on T-junctions (H plane T ,E plane T ,Hybrid T ) ? 7) Define TE & TM modes in wave guide ? 8) Different microwave passive components? 9) Define a) dominant mode b) cutoff freq c) wave guide length d) phase velocity e) group velocity 10) Wave guide junctions / different T-junctions? 11) Define MW-Bends, Tapers? 12) What are different types of solid state devices in Micro waves? ESSAY QUESTIONS : 1) Construction and working of a) Gunn diode b) impatt diode 3) trapatt diode ? 2) Working principals of a) Meflex klystron b) Magnetron  3) Working principals of  T.W.T?

 UNIT 4  RADARS SHORT ANSWER QUESTIONS : 1) Principal and advantages of RADAR? 2) Radar range equation ? factors effect on radar range? 3) Types of radars? 4) Advantages and Disadvantages of pulse radar ? 5) State the need of Duplexer ? 6) What is Doppler effect in radar? 7) Functions of Duplexer? 8) Types of Radar displays? 9) Concept of Blind speed? 10) Applications of various radar systems ? ESSAY QUESTIONS : 1) Block diagram and working of C.W. radar ?  2) Block diagram and working of Pulse radar ?  3) Block diagram and working of MTI radar ?

  UNIT 5  SATELLITE COMMUNICATION SYSTEM SHORT ANSWER QUESTIONS : 1) Use of satellite in communications ? 2) Explain uplink and Downlink frequencies? 3) Various transponders in satellite ? 4) Advantages of satellite communications over terrestrial communications? 5) Functions of satellite transponders? 6) Applications of satellite in GPS ? 7) Applications of  DTH ? 8) Short notes on GCE transmitter & receiver ? ESSAY QUESTIONS : 1) Draw and explain the block diagram of satellite communication? 2) Draw and explain the block diagram of earth station with GCE? 3) i) Explain the band width of satellite system ?     ii) Draw the block diagrams for single,double conversion transponder and regenerative transponder ?