b) Sketch the horizontal and verti lane radiation pattern of Centre fed $531 dipole for the following length- (i ipole (ii) 31/2 dipole (iii) 27. Attempt any three of the following: ?$?I?Q 7 x 3" 3% a) Calculate the effective aperture for : antenna of length 2cm at a 1.2 G will be the power received for nt power density of 2mW/m2. 3) Find the radiation emciency of a In diameter loop of diameter coppet wire at lOMHz. f) Estimate the distance & effective aperture of a paraboloid re?ectot antenna required to produce Null beam width of 10? at 3GHz. F ind radiation resistance and ef?ciency? e) What is end-?re array and broud-side array? d) Define the gain of antenna? e) De?ne virtual height and skip distance?. 2 x 7 = 14 3) Give reason why does retardation petentinl take place? h) A thin dipole antenna is 1/15 long if its loss resistance is 1.5 W. If require any missing data then choose suitably. ' (SEM V) THEORY EXAMINATION 2018-19 ANTENNA AND WAVE PROPAGATION nine: 3 Haurs. Printed PI 1 cl: 2 Sub Code:REC 05] menaI? nonmi L1 r1 r1 r1 r1 ETECH.
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