Antenna & Wave Propogation — Summer 2022

Define following terms: 1) HPBW 2) Antenna radiation efficiency 3) Radiation density 4) Beam solid angle 5) Directivity 6) Beam area 7) Antenna temperature

Explain reciprocity theorems to antennas with applications.

Define Oscillating Dipole. Derive Eand Hfield components due to Oscillating Dipole in spherical co-ordinate systems.

Difference between End fire and Broadside array

Explain design consideration for Yagi-uda Antenna Array.

Explain measurement of radiation patterns, gain and phase polarization.

Write note on pattern multiplication principle

Write note on Dolph-Tchebysheff amplitude distribution for Linear array

Explain Structure of troposphere and ionosphere.

What is Rumzey’s principle? Explain with neat sketch log periodic dipole array.

What is the importance of parabolic structure as a reflector in antenna? Explain feed techniques in reflector antenna.

Explain Helical antenna Geometry with neat diagram. Also explain various modes of propagation in helical antenna.

Explain Binomial array

Define the following terms for radio wave propagation. 1) Virtual height 2) MUF 3) Critical frequency 4) Skip distance 5) Fading 6) Multi hope propagation 7) OWF

Write note on Microstrip patch antennas with their application

Write note on Different modes of Radio wave propagation

Loop Antenna