# IT-1: Provide highly efficient technology solution Assignment Help

Part 2 (50 marks)(i) Explain the physical meaning of the L, C, R and G parameters used to model thebehaviour of transmission lines. Sketch the circuit for this model.(ii) Design a ??/4 transformer to match a 50 ? coaxial cable to a 75 ? coaxial cable,working at a frequency of 2 GHz. You should specify all the dimensions of the matchingsection. Take the phase velocity to be 3 x 108m/s, the relative dielectric constant of theinsulator (?r) to be 2.5 and the outer diameter to be 10 mm.(iii) Sketch your design.(iv) What is the magnitude of the reflection coefficient at the 75 ? cable interface withthe matching section and the corresponding VSWR?(v) What are the inductance per unit length and the capacitance per unit length for thematching section you have designed?Take 0 =4? x 10-7 H/m; r =1 and ?0 = 8.85 x 10-12 F/mPart 3 (30 marks)Describe briefly the additional matching technique you would need to use if the 75 ? cablewas replaced with a reactive load. You may use a sketch to illustrate your answer.If the impedance of this reactive load is 75 j40 ? calculate:(i) a design for a this additional matching element, specifying its dimensions andcharacteristics.(ii) the magnitude and phase of the reflection coefficient and the corresponding VSWR.