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UANDISTAR Code No: V0424/R07 II B.Tech II Semester, Regular Examinations, Apr – 2011 ELECTRO MAGNETIC WAVES AND TRANSMISSION LINES (Electronics and Communications Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. a) Define and distinguish between the terms electric fields, electric displacement and electric flux density. b) A line charge L ρ = 400pC/m lies along the X- axis. The surface of zero potential passes through the point P (0,5,12)m. Find the potential at point (2,3,-4)m. (8M+8M) 2. a) Define Ampere’s force law with associated relations. b) A filamentary current of 10A is directed in from infinity to the origin on the positive x-axis, and then back out to infinity along the positive y-axis. Find H at P (0, 0, 1). (8M+8M) 3. a) State the boundary conditions satisfied by electromagnetic fields E and H at the interface of air perfect dielectric. b) In a nonmagnetic medium E= 50 cos (10 9 t-8x)a y + 40 Sin(10 9 t-8x) a z V/m. Find the dielectric constant g304 r and the corresponding H. (8M+8M) 4. a) Define uniform plane wave. Prove that uniform plane wave does not have field components in the direction of propagation. (8M+8M) b) If r =9, μ= μ 0 , for the medium in which a wave with a frequency of f=0.3GHz is propagating, determine the propagation constant and intrinsic impedance of the medium when g305 = 0. 5. a) For good dielectrics derive the expression for g302 , g533 , V and g536 . (8M+8M) b) Find g302 , g533 ,V and g536 for ferrite at 10 GHz, g304 r =9, μ r =4, g305 =10 mho/m 6. a) Derive the field components for TE wave between parallel plates. (8M+8M) b) If a wave of 6 GHz is propagation between two parallel conducting plates separated by 30mm, find the cut off wave length, guide wave length for TE 1 mode. 7. a) Using the general line equations, obtain an expression for the input impedance of a line. b) A lossless transmission line has capacitance if 50 Pf/m and an inductance of 200 nH/m. Find the characteristic impedance for section of a line 10m long and 500m long. (8M+8M) 8. a) Explain clearly why the short circuited stubs are preferred over to a open circuited stubs? b) Derive the expression for the input impedance of a loss-less line. Hence evaluate Z sc and Z oc and sketch their variation with line length. (8M+8M) 1 of 1 SET - 1
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UANDISTAR Code No: V0424/R07 II B.Tech II Semester, Regular Examinations, Apr – 2011
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