Find the impedance of the quarter wavelength
Course:- Other Engineering
Reference No.:- EM131469735

Assignment Help
Expertsmind Rated 4.9 / 5 based on 47215 reviews.
Review Site
Assignment Help >> Other Engineering

2017 Assignment

Question 1:

Consider a transmission line with a characteristic impedance of Zo = 50?. Use a Smith Chart sheet to show the following landmark points:

i. The matched point

ii. Z = 0Ω

iii. Z = ∞Ω

iv. Y = 0Ω

v. Y = ∞Ω

vi. Position where the inductive reactance is +jZo

vii. Position where the capacitive reactance is -jZo

viii. State why admittance (Y) is used designing using Smith Charts [4]

Question 2:

Assuming the characteristic impedance of the transmission line (Zo) is 50?, use a separate Smith chart to plot the following load impedances and then find the corresponding admittances and de-normalise (give values in 1/? or mhos)

i. ZL1 = ?50 + j50? [3]

ZL2= 20? - j10? [3]

Question 3:

a. Assuming a transmission line With characteristic impedance (Zo) = 50? and a load impedance (ZL) = 40? - j25 ? is connected to the distal end of the transmission line, use a separate Smith Chart sheet to find the following:      

i. The de-normalised input impedance at 0.2λ from the load

ii. The de-normalised input impedance at 8.4λ from the load

iii. The reflection coefficient reflection coefficient (?), the VSWR and the return loss (in dB)

Note: Move in a clockwise direction from the load (ZL) toward the generator (TWG)

b. A transmission line with a characteristic impedance (Zo) of 50? has a load impedance (ZL) of 30- j40? attached to the distal end. It is necessary to use a quarter wavelength transformer or matching section to match the impedance of the line (Zo) to the impedance of the load (ZL), but in order to do this we must first deal with the reactive part of the load. Use a separate Smith Chart to solve this problem.

i. Find the length of 50? transmission line required to make the load look purely resistive (real) to enable a quarter wavelength matching section to be implemented.

ii. Find the impedance of the quarter wavelength matching section required to match the real part of the impedance that has been moved onto the horizontal line.           

iii. Provide a diagram of the overall arrangement.

Put your comment

Ask Question & Get Answers from Experts
Browse some more (Other Engineering) Materials
A chain of length l and mass m lies in a pile on the floor. If its end A is raised vertically at a constant speed v, express in terms of the length y of chain which is off t
The purpose of this lab is to construct a practical Colpitts RF Oscillator circuit with MultiSIM. The frequency of output waveforms will be measured using a virtual oscillos
What are the minimum, maximum and expected values for the total - What is the probability of matching or exceeding the values in (i), (ii) and (iii) if only five dice are used
Project - SOI Devices: Energy Balance and Lattice Temperature Model. Modify the script accordingly to simulate, using the parameters given in the table below, 25, 45, 90, 120
Students will locate and identify appropriate sources of information using multiple sources and methods, including bibliographic, textual, experiential, and experimental res
A venturi meter is a device to measure fluid flow rates, which in its operation resembles the orifice meter (Section 3.2b). It consists of a tapered Constriction in a line,
Consider the circuit demonstrated in this week's presentations. With the turns ratio modified to 20:1, calculate the following values of Vs and Is for the given values of RL
Analyse the economic worth of this investment using the Present Value Method and suggest whether to proceed or to cancel the investment plan.Compound Interest Table for 8%