8/11/2019 MWE R-09 Previous Paper Questions

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Previous paper Questions Unit 2

ECE Dept, Sreyas Institute of Engineering & Technology Microwave Engineering

PREVIOUS PAPER QUESTIONS

UNIT -2

1. (a) What is a cavity resonator? Explain the principle of operation of a rectangular cavity resonator.

(b) A rectangular cavity resonator has dimensions of a = 5 cms, b = 2 cms and d = 10 cms. Compute the

resonant frequency of the dominant mode if the cavity is

i. Air filled andii. Dielectric filled with r= 2.3. [8+8] R07 May 2010 Set 2

2. (a) Explain how a rectangular cross section of a micro strip line can be transformed in to equivalent circular

conductance.

(b) In the above transformation, what is the significance of t/w ratio. [8+8] R07 May 2010 Set 4

3. (a) Derive the Q for TM111mode of rectangular cavity assuming lossy conducting walls and lossless

dielectric.

(b) The quality factor of micro strip line is reciprocal of the dielectric loss tangent and is relatively

constant with frequency. Prove this statement. [8+8] R07 May 2010 Set 1

4. (a) Explain the concept and merits of a micro strip line transmission.

(b) Discuss the properties of micro strip lines. [8+8] R07 Dec 2010 Set 2

5. (a) Write a short notes on the \losses occurring in a micro strip lines".

(b) Show the field configuration in strip and micro strip lines. Compare their properties, merits and

demerits. [8+8] R07 Dec 2010 Set 4

6. (a) For TE101mode in a rectangular cavity resonator of width `a', height `b' and length `d', show that thefrequency of resonance is given by

(b) Derive an expression for quality factor for a rectangular cavity resonator.[8+8] R07 Dec 2010 Set 1

7. (a) Describe various losses in micro strip lines.

(b) A certain micro strip line has the following parameters. r= 5.23; h = 7 mils; t = 2.8 mils; w = 10 mils.

Calculate the characteristic impedance of the line. [8+8] R07 Dec 2010 Set 3

8. (a) A Microstrip Transmission line has a dielectric substrate of height h=0.2 mm., relative permittivity of

4.8, strip width of w=0.26 mm., line thickness 0.03 mm. at 10 GHz. Find its characteristic impedance,

listing out the expressions used. What happens if this is assumed as a wide microstrip line ?

(b) Explain the need for Cavity Resonators at microwave frequencies, identifying their characteristic

parameters, merits and limitations. [8+8] R07 Apr 2011 Set 2

9.(b) Explain how a rectangular waveguide can be configured as a Cavity Resonator. Hence establish an

expression for its dominant mode resonant frequency if its axial dimension is larger than the cross

sectional dimensions. [8] R07 Apr 2011 Set 4

8/11/2019 MWE R-09 Previous Paper Questions

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Previous paper Questions Unit 2

ECE Dept, Sreyas Institute of Engineering & Technology Microwave Engineering

10.(b) Explain and account for the dielectric losses existing in microstrip transmission lines. [8]R07 Apr 2011 Set 3

11.(a) For an air-filled rectangular guide cavity resonator of 4 cm x 2 cm. cross section and 5 cm. axial

length, determine the resonant frequency of the lowest 3 possible modes.

(b) Sketch and explain the constructional features and field lines associated with the propagation in

Microstrip Lines. What are the applications of such lines at microwave frequencies ? [8+8]R07 Dec 2011 Set 4

12 (b) Define and establish an expression for the Q factor of a cavity resonator. Hence distinguish between

Qext, Qo, QLoadedand QUloaded, and list their inter-relation. [8] R07 Dec 2011 Set 1

13.(b) Explain how a rectangular waveguide can be configured as a Cavity Resonator. Hence establish an

expression for its dominant mode resonant frequency if its axial dimension is larger than the cross

sectional dimensions. [8+8] R07 Dec 2011 Set 3

14. (b) Identify the different types of Cavity Resonators, and list out their applications at microwave

frequencies. [8] R07 May 2012 set1,2,3,4

15a) What is Q factor for resonant cavity ? Derive its equation. [8] R07 Dec 2012

16a) Derive the expression for power transmission in rectangular waveguides supporting only dominant mode

propagation. On what factor does the power handling capacity of the waveguide mainly depend.

b) Write brief notes on microstrip line.

c) Find the resonant frequencies of first 3 lowest order modes in an air filled rectangular cavity resonator of

dimensions(5cm x 4cm x 2.5cm). [16] R09 Dec 2012

17.a) What is the dominant mode of propagation in

i) Rectangular waveguides

ii) Circular waveguides

iii) Rectangular Cavities?

b) Calculate the resonant frequency of dominant mode in a rectangular cavity of dimensions,

2cm 3cm 6cm.

c) Write a note on the power losses in a waveguide. [16] R07 May 2013