## EC6701 RFME 2marks

Anna University Regulation 2013 ECE EC6701 RFME 2marks & 16marks for all 5 units are provided below. EC6701 RFME Short answers, Question Bank for RF & Microwave Engineering are listed down for students to make perfect utilization and score maximum marks with our study materials.

### UNIT – I TWO PORT RF NETWORKS- CIRCUIT REPRESENTATION

#### PART A

1. Define s-matrix

Scattering matrix is a square matrix which gives all the combination of power relationships between the various input and output port of a microwave junction.

2. What is the .Properties of s-matrix?

1. It possess symmetric property sij =sji

2. It possess unitary property [s][s]*=[i]

3. Why is s-matrix used in MW analysis?

S matrix is used in MW analysis to overcome the problems which occurs when H, Y, &Z parameters are used in high frequencies.

1. Equipment is not readily available to measure total voltage &total current at the ports of the network.

2. Short and open circuits are difficult to achieve over a broad band of frequencies.

3. Active devices, such as power transistor &tunnel diodes, frequently won’t have stability for a short or open circuit.

4. Give ABCD matrix for a two port network

V1=A B V2

I1 C D -I2

5. What is ABCD matrix?

ABCD matrix is a transmission matrix. These parameters express voltage and current at output in terms of those at input port. V1=AV2-BI2

I1=CV2-DI2

6. What are the advantages of ABCD matrix?

1. They are used in power transmission lines.

7. What is the Scattering matrix for N port device?

[S]= S11 S12 S13……

S1n S21 S22 …………S2n

S31 S32 ………….S3n . .

Sm1 Sm2 …………Smm

8. Give the properties of impedance [x]&admittance[y] matrix?

1. For a lossless junctionary y and z are symmetric.

2. [y]=[z] -1

3. Elements of matix [Z] &matrix [Y] are Frequency dependent

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EC6701 RFME 2marks

Anna University 7th SEM ECE RFME 2marks 16 marks