| ANTENNA AND WAVE PROPAGATION |
| PAPER NO. 2 |
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| PUT ON: JUNE,2K3 |
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EC-305 ANTENNA AND WAVE PROPAGATION (B.Tech 5th Semester,2063) Time : 3 Hours Maximum Marks : 60 NOTE:- This paper consist of Three Sections. Section A is compulsory. Do any Four questions from Section B and any two questions from Section C Section-A Marks : 20 1(a) What is radiation intensity ? (b) What is a monopole? (c) What is Antenna Gain ? (d) What is Antenna impedence? (e) What is Parabolic Reflector ? (f) What is Bionomial Array ? (g) What are Superdirective Arrays? (h) What are Slot Antennas ? (i) What is Trospheric Scattring ? (j) What is lowest useful high frequency in ionosphere propagation ? Section-B Marks:5 Each 2. Explain the concept of loss aperture. 3. What is maximum effective aperture of a short dipole ? 4. What is Friis Transmission Formula ? 5. Explain antenna field zones. 6. Obtain an expression for directive gain of an antanna. Section-C Marks : 10 Each 7. Obtain an expression for field pattern of a two element array and draw the field pattern for: (a) when d=λ/2 and α = 0o (b) when d = λ/2 and α = 180o 8. Explain the following in detail: (a) Wave tilt d surface waves (b) Duct. propagation. 9. Explain the following in detail : (a) Regular and irregaular variations of the ionosphere (b) Propagation through ionosphere |
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