Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Electrical Engineering (EE): Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

The document Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE) is a part of the Electrical Engineering (EE) Course Basic Electronics Engineering for SSC JE (Technical).
All you need of Electrical Engineering (EE) at this link: Electrical Engineering (EE)

Waveguides

Waveguides (single conductor lines) 

  • At frequecies higher than 3 GHz, there are more losses in Transmission lines. 
  • A hollow metallic tube used to transmit EM waves by successive refelections from inner walls of tube is called waveguide.

Difference with transmission line: 

  • In waveguide, only wa ves having frequencies grea ter than cut off frequency fc will be propagated that is why waveguide act as a HPF.
  •  Waveguide is one conductor transmission line.

Rectangular waveguide: 

  • TM11 is dominant mode for TM waves. 
  • TE10 is dominant mode for TE wave and it is also overall dominant mode (when a >b).

In this TM10 or TM01 does not exist.

Cut of frequency :
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Phase constant:
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Phase velocity:
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Group velocity :
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

In waveguide: vp > c>vg

i.e. vpv=c2

In vacuum : vp = c = vg  Intrinsic wave impedance:

For TE Mode:
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

For TM mode:
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Guided wavelength (lg):
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Where lo = free space wavelength lc = Cutoff wavelength lg > lc >l0

Power handling capacity of rectangular waveguide
Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

ORWaveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

For standard rectangular waveguide : a = 2b 

  • Dominat mode: it is the mode with lowest cutoff frequency ((longest cutoff wavelength).

Circular /Cylindrical waveguide: 

  • TM01 is dominant mode for TM waves. 
  • TE11 is dominant node for TE waves and it is overall dominant mode. 
  • In circular waveguide second suffix of TE or TM modes cannot be zero (as TMmo or TEmo can not exist)

Cut off wavelength: For 

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

r= ra diu s o f c ircula r waveguide

For

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Power handling capacity of circular waveguide:

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

d= Intenal diameter
Cavity Frequency:  

  • When both the ends of the waveguide are terminated, signal bounces back and forth between two shorting plates. 
  • This results in resonance in cavity that is why it is called cavity resonator. 
  • Cacity resonators act as BPF and it is used for energy storage.

Resonant frequency:

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

  • TE101 is the dominant mode of cavity resonator. 
  • TM110 is lowest order of cavity resonator.

Quality factor of cavity resonator

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

W ® Maximum stored energy
P ® average power loss Integer m ® no. of half cycle variations in X direction.
Integer n ® no. of half cycle variations in Y direction.

The document Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE) is a part of the Electrical Engineering (EE) Course Basic Electronics Engineering for SSC JE (Technical).
All you need of Electrical Engineering (EE) at this link: Electrical Engineering (EE)

Related Searches

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

,

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

,

Important questions

,

practice quizzes

,

Waveguides Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

,

Objective type Questions

,

Previous Year Questions with Solutions

,

Exam

,

pdf

,

Free

,

Semester Notes

,

Sample Paper

,

video lectures

,

Summary

,

mock tests for examination

,

study material

,

Extra Questions

,

MCQs

,

ppt

,

Viva Questions

,

past year papers

,

shortcuts and tricks

;