Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

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

The document Microwave Hybrid Circuits 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)

 Microwave Hybrid Circuits

The interconnection of two or more microwave device using waveguides, tees or direction coupler is called as microwave junction. 

  • We use traveling waves as a variables to characterize the hybrid parameters because at microwave range:
    (i) It is difficult to mea sure total voltage a nd current at the posrts of network.
    (ii) Short and open circuits are difficult to achieve over a broad band of frequencies.

To overcome these problems, we characterize the new parameters called S-parameters.

Waveguide Tees: 

E-plane Tee (Series Tee): S13 = – S23 For a matched junction S-matrix

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)
Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

S- matrix of E-plane tee is given by

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

H-plane Tee : S13 = S23

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

S=matrix

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Magic Tee (Hybrid Tee) : Combination of E=plane Tee and H-plane Tee

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

1. If input at port 1 and port 2 is applied, the output will be zero at port 3 and additive at port 4.
2. If input is appllied at port 4 it is divided equally between port 1 and port 2 and does not appear at port 3.
3. If input is applied at port 3, it will produce an output of equal magnitude and opposite phase at port 1 and port 2 and output at port 4 is zero i.e. S34 = S43 = 0.

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Application of Magic Tee: Measurement of impedance, as a mixer, duplexer.
Hybrid rings (Rat-Race circuits):

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

S-matrix:

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

If input is at port 1, it will not appear at port 3. If input is at port 2, it will not appear at port 4.

Directional Coupler:

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Coupling Factor :

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Directivity:

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Coupling factor is a measure of percentage of incident power being sampled while directivity is a measure of how well the directional coupler distinguish between the forward and the reverse travelling powers.

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Isolation:

S-Matrix:

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Circulator: circulator is a four port microwave device in which wave can only flow from nth port to (n+1)th port

Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)
Microwave Hybrid Circuits Notes | Study Basic Electronics Engineering for SSC JE (Technical) - Electrical Engineering (EE)

Isolator: An isolator is a device which provides very small attenuation in one direction and provides maximum attenuation in the opposite direction. 

  • It is uniline device used to improve frequency stability in microwave generators in which the reflection from the load affects the generating frequency.
The document Microwave Hybrid Circuits 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)

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