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The dominant mode is propagating in rectangular waveguide of dimensions a=6cm,b=4cm. The distance between a maxima and minimum is 4.47cm. Determine the signal frequency at the dominant mode.
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(a) For the dominant mode of operation in an air filled circular wave guide of inner diameter 8 cms, calculate: (i) Cutoff wavelength
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a) What is Magic Tee? Give its application and write the s-matrix for magic Tee.
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b) Discuss the power transmission and power losses .in rectangular waveguide.
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a) An airfilled circular waveguide has a radius of 2 cm and is to carry energy at a frequency of 10 GHz. Find all the TEnp and TMnp modes for
which energy transmission is possible.
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b) State and explain the poyting theorem.
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a) Write the Maxwell equation in frequency domain and give their significance.
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(a) An IMPATT diode has a drift length of 4 mm. Determine: (i) Operating frequency
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(a) An IMPATT diode has a drift length of 4 mm. Determine: (i) Drift time
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(a) For the dominant mode of operation in an air filled circular wave guide of inner diameter 8 cms, calculate: (iii) Wavelength in the guide
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(a) For the dominant mode of operation in an air filled circular wave guide of inner diameter 8 cms, calculate: (ii) Cutoff frequency
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b) Explain the working of two hole directional coupler and write s-matrix.
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(b) Explain TRAPATT diode with diagram and applications.
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(a) Write short note on: (ii) Varactor diode
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(a) Write short note on: (i) Measurement of Microwave power
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(b) What do you mean by M-R relation? And use in parametric up and down converter.
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(b) Explain helical TWT and slow wave structure with construction,working principle.
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(a) With help of Two-Valley model, explain Gunn diode.
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(b) Derive Hull's cut off equation for cylindrical magnetron.
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09. Write short note on: a) VSWR meter
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Write short note on: b) Varactor diode
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b) A two cavity klystron amplifier has the following parameters. Vo=1000 V lo=25 mA RO= 40  f = 3GHz
Gap spacing in either cavity d= 1mm spacing between two cavities L=
4 cm. Effective shunt impedance excluding beam loading = R = 30  i) Find the input gap voltage to give maximum voltage V2. ii) Find the voltage gain, neglecting the beam loading in the output cavity. iii) Find the efficiency of the amplifier, neglecting beam loading.
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f) What is avalanche multiplication? Explain.
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e) Explain the operation and application of Tunnel diode.
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d) Discuss the bunching process in klystron.
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c) What is a hybrid ring? Write S-matrix for hybrid ring.
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b) Give the some applications of microwaves.
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a). What are different IEEE microwave frequency bands?
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(b) Determine the [S] of a 3-port circulator given insertion loss of 0.5 db,isolation of 23 db and VSWR of 2.
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b) A up converter parametric amplifier has the following parameters. Ratio of output frequency over signal frequency fo/fs=25
Figure of merit=10 Factor of merit figure=0.4
Diode temperature=350 K
Find power gain in decibels, noise figure in decibels and bandwidth.
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a) Draw the physical structure of IMPATT diode and explain negative resistance region.
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b) Explain the Gunn Effect.
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a) Find the expression for power output and efficiency of Reflex Klystron.
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a) Explain the velocity modulation process of klystron.
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b) Explain the operation of rectangular cavity resonator and find the relation for resonant frequency.
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a) Discuss the operation of microware circulator and find the S-matrixfor 4-port circulator.
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A three port circular has an insertion loss of IdB, Isolation 30dB and VSWR-1.5.Find the scattering matrix.
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Explain the principle of the power meter for lowrange microwave power
measurement.
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Derive formula for radar range equation. Compare pulsed radar with CW Doppler radar.
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Why PIN diodes are more suitable for high frequency switching applications as compared to PN Junction diode.
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What is transferred electron effect? What are the semiconductor material characteristics required for it to exhibit the effect?
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Why Ge and GeAs is the most commonly used semiconductor material for making tunnel diode?
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Explain the operation of Gunn diode with the help of two valley model.
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Why isolator is connected in microwave experiment bench after microwave source?
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Explain the principle of microwave circular and also write its scattering matrix.
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Explain any method of measuring unknown impedance of a terminating load in a microwave system.
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What is velocity modulation? How it is utilized in Klystron amplifier?
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Explain the operation of BH plane Tee junction. Why it is referred to as Magic Tee Derive its scattering matrix.
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State the Maxwell's equations and explain their physical significance.
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How waveguides are different from two wire transmission lines? similarities and dissimilarities.
Discuss the
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Explain different types of microwave hiters.
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What are transit time devices?
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What is slow wave structure? Why do you need a slow wave structure in TWT amplifier?
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Transit time effect sets a limitation to the high frequency behaviour of conventional vacuum tubes but it plays a vital role in the operation of the Klystrons. How?
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(e) What is the use of VSWR meter in microwave measurements.
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It is impossible to measure h, Y, Z parameters at microwave frequencies Why?
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(a) What is magic tee? Draw and explain its working.
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(b) What is directional coupler and write its scattering-matrix.
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(a) Draw and explain the construction and operation of Faraday rotation Isolator with application.
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(c) What is wave impedance in TE and TM mode.
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(b) Comparison of coaxial, waveguide and planar transmission line.
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(a) What are the different boundary condition for microwave?
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(b) Obtain all the field components in a rectangular waveguide and derive wave equation for TM mode.
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(a) What is reflex klystron? And explain its working principle,construction and performance characteristics.
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(d) Write short note on Tunnel diode.
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(c) Differentiate between Klystron and TWT.
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(b) What are various limitations of Z, Y and H parameters for microwave circuits.
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(a) Write Maxwell's equations in integral and differential form.
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An air filled rectangular waveguide of inside dimensions 73.5cm operates in the dominant mode.Determine the guided wavelength at the same frequency.
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An air filled rectangular waveguide of inside dimensions 73.5cm operates in the dominant mode.Determine the phase velocity of wave in the guide at a frequency of 3.5 GHz.
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An air filled rectangular waveguide of inside dimensions 73.5cm operates in the dominant mode.
Find the cut off frequency.
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