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If the transmission is not terminated in its characteristic impedance ,then there will be two waves traveling along the line which gives rise to standing waves having fixed maxima and fixed minima.

What are the secondary constants of a line? What are the possible modes for TM waves in a circular waveguide? CharacteristicImpedance Propagation Constant Since the line constants R, L, C, G are distributed through the entire length of the line, they are called as distributed elements.

What are guided waves? Derive the expression for the resonant frequency of the semi circular cavity resonator? Give some of the impendence.

EC Transmission Lines And Wave Guides May June Question Paper

When reflection occurs in a line? What tranwmission the types of cavity resonators? Explain in following terms i Reflection factor ii Reflection loss iii Return loss 8. A short circuited stub is preferred to an open circuited stub because of greater ease in constructions and because of the inability to maintain high enough insulation resistance at the open. Tranemission the field strength or equation in cylindrical co — ordinates systems? Equalisers are traansmission whose frequency and phase characteristics are adjusted to be inverse to those of the lines, which result in a uniform frequency response over the desired frequency band, and hence the attenuation is equal for all the frequencies.


What are degenerate modes in a rectangular waveguide? What is the use of a circle diagram?

ECTransmission lines and wave guides – Lecture Notes – Mohanavalli Edition

When a medium is said to be free- space. This non- propagating mode is known as evanescent mode. Remember me on this computer. The difficulties of the smith chart are i Single stub impedance matching requires the stub to be located at a definite point on the line. Homework 1 – University of St.

Why is circular or rectangular form used as waveguide? What is lumped loading? State the values of a and b for the dissipation less line. What are the conditions for a perfect line?

EC2305 Transmission Lines and Wave guides QUESTION PAPER

When a signal having many frequency components are transmitted along the line, all the frequencies will not have equal attenuation and hence the received end waveform will not be identical with the input waveform at the sending end because each frequency is having different attenuation.

If the indicator is non linear, corrections must be applied to the readings obtained. Define dominant mode for a circular waveguide. The resistance R increases with square root of f while inductance L increases with f. Why is TM01 mode preferred to the TE01 mode in a circular waveguide? Give examples The electromagnetic waves that are guided along or over wavgeuides or dielectric surface are called guided waves.

A half wavelength line may be considered as a one- to. Define wave impedance and write the expression for wave impedance of TE waves in rectangular guide. Give the input transmissikn of a dissipationless line.

Give the formula to calculate the length of the short circuited stub. Calculate the cut-off wavelength, the guide wavelength and the characteristic wave impedance for the TE mode. What is TH wave or E wave? Click here to sign up. Waveguides are used in microwave transmission. A daveguides, which has neither frequency distortion nor phase distortion is called a distortion less line.


Because the TE10 mode has the lowest attenuation of all modes in a rectangular waveguide and its electric field is definitely polarized in one direction everywhere. Waveform distortion is of two types: The possible TM modes in a circular waveguide are: What is the dominant pines in a circular waveguide The dominant mode for TM waves in a circular waveguide is the TM01 because it has the root value of 2.

Also discuss the application of quarter wave line? What is double stub matching?

When the operating frequency is lower than the cut-off frequency, the propagation constant becomes real i. What are the performance parameters of microwave resonator? The input impendence of eighth wave line terminated in a pure resistance Rr.

Derive the expression for attenuation of TE waves in between parallel Plates? Its application is to connect load to a source where they cannot be made adjacent. What is the dominant mode for circular resonator? Waveguides usually take the form of rectangular or circular cylinders because of its simpler forms in use and less expensive to manufacture. Derive the expression for the wave impedance in circular wave guide?

What is the dominant mode for the rectangular waveguide? The possible TE modes in a circular waveguide are: