Antenna & Wave Propogation — Winter 2022

Explain following antenna parameters: i. Radiation resistance ii. Antenna efficiency iii. Directivity iv. Gain

Derive the expression of Friss transmission formula for radio link.

Derive the formula of radiation resistance for dipole antenna.

Write a short note on Antenna Radiation Pattern with necessary figure.

What is Hertzian dipole? Write the relation between a current element and an electric dipole writing suitable expressions.

Explain following with respect to linear arrays: i. Schelkunoff theorem ii. Discuss Dolph–Tchebysheff distribution

Why smart antenna is called so? Explain in detail the concept of smart antenna with appropriate diagrams.

List out various antennas for special applications. Explain any one in brief.

List out various methods of antenna gain measurement. Describe any one in brief.

Explain different types of Reflector antennas.

Explain Yagi Uda antenna in detail.

Discuss two Modes of Helical antenna. Enlist the design step for any one mode with the help of necessary formula.

Explain Babibet’s principal for slot antenna.

Explain Ground Wave Propagation in Detail.

Explain (i) Skip Distance (ii) Critical Frequency (iii) MUF

Discuss feed Methods of Microstrip Patch antenna.

Write a detailed note on role of ionosphere in sky wave propagation.