### EC2305 TRANSMISSION LINES AND WAVEGUIDES PDF

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Bring out the significance of a half wavelength line. Why TEM mode is not possible in a rectangular waveguide?

So for proper maximum power transfer, the impedances in the sending and receiving end are matched. The parameters of a transmission line are: A half wavelength line may be considered as a one- to.

The ratio of the maximum to minimum magnitudes of current or voltage trandmission a line having standing wave is called the standing-wave ratio S. The linws of the smith chart are, i It is used to find the input impendence and input admittance of the line.

At very high frequencies transmission line resonator does not give very high quality factor Q due to skin effect yransmission radiation loss. What is standing wave ratio?

## EC2305 Transmission Lines and Wave guides QUESTION PAPER

What is the dominant mode for circular resonator? Why is TM01 mode preferred to the TE01 mode in a circular waveguide? What is patch loading? It is also called as flat line.

### ECQB TLW | jayapradeepa S –

The standing wave ratio S and the position of a voltage minimum are the independent measurements that must be made to find the location and length of the stub.

Derive the TM wave components in circular wave guides using Bessel functions? Some of the higher order modes, lins the same cut off frequencyare called degenerate modes. An important application of the quarter wave matching sectionis to a couple a transmission line to a resistive load such as an antenna. Lumped loading is the process of increasing the inductance value by placing lumped inductors at specific intervals along the line, which avoids the distortion Give the input impedance of open and short circuited lines.

What are the difficulties in single stub matching? The TE 10 wave have the lowest cut off frequency compared to the TM11 mode.

The distortions occurring in the transmission line are called waveform distortion or line distortion. What is called standing wave ratio?

When the line is terminated in its characteristic impedance, the load will absorb some power and some will be reflected back thus producing reflections.

A quater wave line may be considered as an impendence inverter because it can transform a low impendence in to ahigh impendence and vice versa. The root values for the TE modes are: What is cut off frequency? Mention trahsmission applications of circular waveguide.

### ECTransmission lines and wave guides – Lecture Notes – Mohanavalli Edition

Waveguides usually take the form of rectangular or circular cylinders because of its simpler forms in use and less expensive to manufacture. The dominant mode for TE waves in a circular waveguide is the TE11 because it has the root value of 1. TM01 mode is preferred to the TE01 mode in a circular waveguide, since it requires a smaller diameter for the same cut off wavelength. This type of distortion is called frequency distortion. So for an infinite line, the input impedance is equivalent to the characteristic impedance.

A finite line, which is terminated in its characteristic impedance, is termed as infinite line.

For TM modes in rectangular waveguides, neither m or n can be zero because all the field equations vanish i. Because the TE10 mode has the lowest attenuation of all modes in a rectangular waveguide and its electric trans,ission is definitely polarized in one direction everywhere.

What are the root values for the TM modes? State the relation between standing were ratio S and reflection co-efficient k.

A free-space medium is one in which there are no conduction currents and no charges. Resonator is a tuned circuit which resonates at a particular frequency at which the energy stored in the electric field is equal to the energy stored in the magnetic field. Explain why TM01 and TM10 modes in a rectangular waveguide do not exist. Discuss in details about inductance loading of telephone cables and derive the attenuation constant and phase constant and velocity of signal transmission for the uniformly loaded cable?