1. What are the applications of loop antenna? (May2011) 2. Define Pattern Multiplication (May2011)
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1 UNIT-II WIRE ANTENNAS AND ANTENNA ARRAYS 1. What are the applications of loop antenna? (May2011) 2. Define Pattern Multiplication (May2011) 3. A uniform linear array contains 50 isotropic radiation with an inter element spacing of λ/2. Find the directivity of broadside form of arrays. (June2013) 4. What is the pattern multiplication and draw the pattern of 2 point sources separated by λ/2. (June2013) 5. Compare short dipole from half wave dipole. (June2014) 6.What are the advantages of antenna arrays (June2014) 7.What is meant by cross field? 8. Define axial ratio. 9. What is meant by Beam Area? 10. What is duality of antenna? 11. State Poynting theorem. 12. What is point source? 13. What is meant by array? 14. What is meant by uniform linear array? 15. What are the types of array? 16. What is Broad side array? 17. Define End fire array? 18. What is collinear array?
2 19. What is parasitic array? 20. Define beam width of major lobe? 21. List out the expression of beam width for broad side array and end fire array. 22. Differentiate broad side and End fire array? 23. What is the need for the Binomial array? 24. Define power pattern? PART B 1.(a) (i) What is the effective length of linear antenna? (4) (June2013) 1.(a) (ii) Derive the expression for the radiated fields of a center fed λ/2 dipole antenna. Sketch the radiation pattern. (2) (a) (i) what is binomial array? (2) (a) (ii) Draw the pattern of 10 element binomial array with spacing between the elements of 3 λ/4 and λ/2. (14) (June2013) (3) Derive the expression for field pattern of broad side array of n point sources. (16) (June2013) (4).Deduce the field quantities and draw radiation pattern for a half wavelength dipole. (16) (May2011) (5).Two identical vertical radiators are spaced 4 / λ = d meters apart and fed with currents of equal magnitude but with a phase difference β. Evaluate the resultant radiation for β= 0 and thereby identify the direction of maximum and minimum radiation. (16) (May 2011) (6) (a) Derive the electric and magnetic field components of a finite length dipole antenna and show its current distribution with respect to its length in terms of wavelength.(16) (June 2014) (7) 1) Derive the expression for the field produced by a linear array and deduce it for an end fire array.(10)
3 2) Compare end fire and broadside array.(6) (June 2014) (8) (a)explain the principle of rectangular horn antenna with neat sketch.(8) (8)(b) Explain the salient features of flat and corner reflector antenna.(8) (9). Write short notes on various forms of arrays (4x4=16) i. Broad side array ii. End fire array ii. Collinear array iv. Parasitic array (10).Derive the expression for the far field pattern of an array of 2 isotropic point sources (i) Equal amplitude and phase ii) Equal amplitude and opposite phase (16) (iii) Unequal amplitude and any phase (11). Explain the principle of Pattern multiplication. (16) (12).Explain the array of N- sources of equal amplitude and spacing Broad side case i. Direction of pattern maxima ii. Direction of pattern minima (16) iii. Beam width of major lobe (13). Write short notes on. i. Binomial arrays ii. Phased arrays (16) (14). Obtain the expression for the field and the radiation pattern produced by a 2 element (16) array of infinitesimal dipole with distance of separation λ/2 & currents of equal magnitude and phase shift 180 (15).Obtain the expression for the field and the radiation pattern produced by a 2 element array of infinitesimal dipole with distance of separation λ/2 and currents of equal magnitude and same phase (16) Derive the expression for radiation resistance of small loop antenna. (16) (17)(i)What is folded dipole antenna? (8) (17)( ii) Explain the term pattern multiplication. (8) (18). Derive the expression for radiation resistance of loop antenna with circumference (16)
4 equal to wavelength. UNIT V RADIO WAVE PROPAGATION 1.Differentiate virtual height from actual height. (June2014) 2.What are the effects of ground on low frequency wave transmission? ( June2014) 3.Define maximum usable frequency. (May2011) 4. What is meant by Faraday rotation? (May 2011) 5. Find the maximum distance that can be covered by a space wave, (June 2013) when the antenna heights are 60m and 120m. 6. What is Fading? and how it is compensated. (June 2013) 7.Define Troposphere wave. 8. Define Ground wave. 9. What are the types of Ground waves? 10. What is meant by Space Wave? 11. What is meant by Surface Wave? 12. What is meant by fading? 13. What are the types of fading? 14. What are inverse and multi path fading? 15. What is meant by diversity reception? 16. Define Space diversity Reception.
5 17.. Define frequency diversity Reception. 18. Define polarization diversity reception. 19. What is meant by Faraday s rotation? 20. What are the factors that affect the propagation of radio waves? 21. Define gyro frequency. 22. Define critical frequency. 23. Define Magneto-Ions Splitting. 24. Define LUHF. 25 Define Refractive index. 26. Define maximum Usable Frequency. 27. Define skip distance. 28. Define Optimum frequency? 29. Define wave velocity and Group velocity PART B. 1. (a) (i) Explain the mechanism of ionosphere propagation. (8) (16) (May 2011) (ii) How does the earth affect ground wave propagation? (8) 2).(i) Explain the terms : (16) (May 2011) (i) Optimum working frequency (ii) Duct propagation (iii) Virtual height (10)
6 (iv) What are the effects of earth magnetic field? (6) 3. (i) Describe the Troposcatter propagation. (8) (16) (June 2013) 3.(ii) Explain the effect of Earth s magnetic field on ground wave propagation. (8) 4.Describe the theory of propagation of Electromagnetic wave through the ionosphere in the presence of external magnetic field and shows that the medium acts as doubly refracting crystal. (16) (June 2013) 5).[1]Explain the ground wave propagation of radio waves(8) (16) (June 2014) [2] Write notes on faraday rotation.(8) 6.[1]Describe the space wave propagation and explain the importance of line of sight propagation.(8) (16) (June 2014) [2] Explain the following terms with diagram (i) Duct propagation,(ii)critical frequency,(iii)skip Zone.(8) 7. Explain briefly the various modes of Propagation (16 M) 8. Explain Ground Wave Propagation in detail (16 M) 9. Explain the Structure of Atmosphere (16 M) 10. Explain the various layers of Ionosphere (16 M) 11. Explain the effect of Earth s Magnetic Field on Radio wave Propagation (16 M) 12. Explain Virtual Height and derive its Expression (16 M) 13. Explain Maximum Usable Frequency and show how to Calculate MUF (16 M) 14. Explain (a) Skip Distance (b) Optimum Working Frequency (16M) 15. Explain briefly about Ionospheric abnormalities (16 M) 16. Determine the Effective Earth s Radius in Space Wave Propagation (16 M) 17. Explain Super Refraction. (16 M)
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