The document provides an overview of waveguides, including their concept, history, types, modes, and applications. Waveguides are linear structures used to convey electromagnetic waves, with main types being rectangular and circular waveguides, each having specific modes and limitations on bandwidth. Applications include telecommunications, airborne radar, and navigation aids.

1. Waveguide

2. Todays Outline
 Concept about Waveguide
 History
 Types of Wave guide
 Different Modes of Waveguide
Application of Waveguide

3. Waveguide

4. “Any linear structure that conveys
electromagnetic waves between its
endpoints

5. “A device that confines electromagnetic
energy and channels it from one point to
another.

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7. History

8. + First proposed by J.J Thompson in 1893
+ Experimentally verified by Oliver lodge
+ In 1897 Rayleigh first performed the
mathematical analysis

9. Types of Waveguide

10. “1. Rectangular Waveguide
2. Circular Waveguide

11. Rectangular Waveguide
Dominant mode is TE10
Supports TM and TE modes but not TEM waves
There is only one conductor
Bands between 1 GHz to above 220 GHz.
The highest possible band width allowing only a single
mode to propagate is only 2:1

12. Circular Waveguide
Dominant mode is TE11.
Cutoff Frequency equation, fc= (1.8412 * c /2*pi*a)
The highest possible band width allowing only a single
mode to propagate is only 1.3601:1

13. Modes of Waveguide

14. “1. TE Mode
2. TM Mode
3. TEM Mode

15. TE(Transverse Electric) Mode
Electric field is perpendicular to direction of propagation.
Magnetic components are in the direction of propagation.
TE modes (transverse electric) have no electric field in the
direction of propagation.
TE mode is subdivided into TE10, TE11, TE20, TE01

16. TM(Transverse Magnetic) Mode
Magnetic field is perpendicular to direction of propagation.
Electric components are in the direction of propagation.
TM modes have no magnetic field in the direction of
propagation.
TM mode is subdivided into TM11, TM21

17. TEM(Transverse Magnetic) Mode
Both Electric & Magnetic field of signal is
perpendicular to direction of propagation.
In TM modes both electric and magnetic field are
directed components
TEM mode is subdivided into TM11, TM21

18. Uses of waveguide

19. Uses of Waveguide
To carry high frequency radio waves, particularly
microwaves.
It is used to handle high power energy.
Waveguide is used in communication system.
It is mostly used in airborne radar.
Waveguide is used in the devices of navigation aids.

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