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Maximum input impedance, Minimum input impedance, When the operating frequency is lower than the cut-off frequency, the propagation constant becomes real i. Explain about transverse electromagnetic waves between a pair of perfectly conducting planes? Since the root value of TE11 is lower than TM01TE11 is the dominant or the lowest order mode for a circular waveguide.
Double stub matching transmmission preferred over single stub due to following disadvantages of single stub. The circular waveguides are avoided because of the following reasons: Define quality factor of a resonator. What is cut-off wavelength?
State the values of a and b for the dissipation less line. The dominant mode for a circular waveguide is defined as the waveuides order mode having the lowest root value.
When reflection occurs in a line?
Obtain the general solution of Transmission line? What are the conditions for a perfect hransmission Define Propagation constant Propagation constant is defined as the natural logarithm of the ratio of the sending end current or voltage to the receiving end current or voltage of the line.
What is meant by cavity resonator? Derive the field strength or equation in cylindrical co — ordinates systems? The frequency at which the wave motion ceases is called cut-off frequency of the waveguide.
The leakage conductance G is zero pines Explain about properties of smith chart? In ordinary telephone cables, the wires are insulated with paper and twisted in pairs, therefore there will not be flux linkage between the wires, which results in negligible inductance, and conductance.
Why circular waveguides are not preferred over rectangular waveguides? Write down the expression for cut off frequency when the wave is propagated in between two parallel plates.
The points along the line where magnitude of voltage or current is zero are called nodes while the the points along the ljnes where magnitude of voltage or current first maximum are called antinodes or loops.
EC2305 Transmission Lines and Wave guides QUESTION PAPER
Give reasons for preferring a short- circuited stub when compared to an open circuited stub. Define propagation constant of a transmission line. The basic configurations of coaxial resonators are: There are two types of cavity resonators. An important application of the quarter wave matching sectionis to a couple a transmission line to a resistive load such as an antenna.
The TE 10 wave have the lowest cut off frequency compared to the TM11 mode.
EC Transmission Lines and Wave guides QUESTION PAPER
It is the process of using sections of continuously loaded cables separated by sections tgansmission unloaded cables which increases the inductance value A finite line, which is terminated in its characteristic impedance, is termed as infinite line.
Reflection occurs because of the following cases: Determine the solution of electric and magnetic fields of TE waves guided along rectangular wave — guides?
What do you mean by copper insulators? How to avoid the frequency eaveguides that occurs in the line? What are the applications of the quarter—wave line? What are the methods used for constructing a resonator? The circle diagram may be used to find the input impendence of a line m of any chosen length.
Derive the expression for input impedance of lossless line?
Derive the expression for the input impedance of the dissipation less line and the expression for the input impedance of a quarter wave line. What are the secondary constants of a line?
EC Transmission Lines And Wave Guides May June Question Paper
Derive the expression for attenuation of TM waves in between parallel plates? What are degenerate modes in a rectangular waveguide?
When a signal having many frequency components are transmitted along the line, all the frequencies will not have same time of transmission, some frequencies being delayed more than others. What is lumped loading? For the telephone cable to be distortion less line, the inductance value liness be increased by placing lumped inductors along the line.
So for an infinite line, the input impedance is equivalent to the characteristic impedance. It gives the manner in the wave is propagated along a line transmjssion specifies the variation of voltage and current in the line as a function of distance.