WITH EFFECT FROM THE ACADEMIC YEAR 2011 - 2012

EC 252

NETWORKS AND TRANSMISSION LINES

Instruction                                                4              Periods per week

Duration of University Examination    3              Hours

University Examination                          75            Marks

Sessional                                                   25            Marks

UNIT-I

Asymmetrical networks, Image and Iterative impedances. Image transfer constant and iterative transfer constant. Symmetrical networks, characteristic impedance and propagation constant. Properties of L, T and Pi section types.

UNIT-II

Constant K-filters – low pass, high pass, band pass, band elimination filter design, m-derived — low pass, high pass, band pass, band elimination filter design and composite filter design. Notch filter.

UNIT-III

Network synthesys: Hurwitz polynomials,positive real functions, L-C Immitance functions, RC impedance functions and RL admittance functions. RL impedance functions and RC admittance functions. Cauer And Foster’s forms of RL impedance and RC admittance

Attenuators and their design. Equalizers and their design. Impedance matching networks. Inverse network elements.

UNIT-IV

Properties of transmission lines. Transmission line equations from source and load end. The finite and infinite lines. Velocity of propagation, input impedance. Open and short circuited lines, telephone cables, distortion less transmission, loading of cables, Campbell’s formula.

UNIT-V

Properties of Transmission lines at UHF, Reflection co-efficient, Standing waves and SWR, Distribution of voltages and currents on loss less line. Characteristics of half wave, Quarter-wave and one eighth wave lines. Construction and applications of Smith chart. Transmission line matching. Single and double stub matching.

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