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    B G1025 Pages: 2: Answer Any Two Full Questions, Each Carries 15 Marks

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    Binesh Kannoth
    This document contains information about a B.Tech degree examination for the course Microwave and Radar Engineering. It includes three parts - Part A contains two questions worth 15 marks each about re-entrant cavities, klystron amplifiers, bunching processes and reflex klystrons. Part B contains two questions worth 15 marks each about traveling wave tubes, gain parameters and propagation constants. Part C contains two questions worth 20 marks each about minimum detectable signals, Doppler effect, Gunn diodes, radar range equations and principles of radar systems. The document provides examination questions along with relevant concepts and formulas to be answered as part of the degree course.

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    B G1025 Pages: 2: Answer Any Two Full Questions, Each Carries 15 Marks

    Uploaded by

    Binesh Kannoth
    57 views2 pages
    This document contains information about a B.Tech degree examination for the course Microwave and Radar Engineering. It includes three parts - Part A contains two questions worth 15 marks each about re-entrant cavities, klystron amplifiers, bunching processes and reflex klystrons. Part B contains two questions worth 15 marks each about traveling wave tubes, gain parameters and propagation constants. Part C contains two questions worth 20 marks each about minimum detectable signals, Doppler effect, Gunn diodes, radar range equations and principles of radar systems. The document provides examination questions along with relevant concepts and formulas to be answered as part of the degree course.

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    This document contains information about a B.Tech degree examination for the course Microwave and Radar Engineering. It includes three parts - Part A contains two questions worth 15 marks each about re-entrant cavities, klystron amplifiers, bunching processes and reflex klystrons. Part B contains two questions worth 15 marks each about traveling wave tubes, gain parameters and propagation constants. Part C contains two questions worth 20 marks each about minimum detectable signals, Doppler effect, Gunn diodes, radar range equations and principles of radar systems. The document provides examination questions along with relevant concepts and formulas to be answered as part of the degree course.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    57 views2 pages

    B G1025 Pages: 2: Answer Any Two Full Questions, Each Carries 15 Marks

    Uploaded by

    Binesh Kannoth
    This document contains information about a B.Tech degree examination for the course Microwave and Radar Engineering. It includes three parts - Part A contains two questions worth 15 marks each about re-entrant cavities, klystron amplifiers, bunching processes and reflex klystrons. Part B contains two questions worth 15 marks each about traveling wave tubes, gain parameters and propagation constants. Part C contains two questions worth 20 marks each about minimum detectable signals, Doppler effect, Gunn diodes, radar range equations and principles of radar systems. The document provides examination questions along with relevant concepts and formulas to be answered as part of the degree course.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 2

    B G1025 Pages: 2

    Reg No.:_______________ Name:__________________________

    APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY


    SEVENTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019
    Course Code: EC403
    Course Name: MICROWAVE & RADAR ENGINEERING
    Max. Marks: 100 Duration: 3 Hours

    PART A
    Answer any two full questions, each carries 15 marks. Marks
    1 a) Explain the significance of re-entrant cavities in microwave tubes. What are the (5)
    different types of re-entrant cavities?
    b) With the help of a schematic structural diagram explain the working of a two (10)
    cavity Klystron Amplifier. Also give its typical specifications.
    2 a) How oscillation generate in reflex klystron? (5)
    b) With the help of applegate diagram describe the bunching process of two cavity (10)
    klystron amplifier and derive the bunching parameter also.
    3 a) A reflex Klystron operates under following Conditions: (5)
    𝑉0= 600V, Length L=1mm, 𝑅𝑠ℎ =15KΩ, e/m =1.759x1011 , 𝑓𝑟 =9GHz
    3
    𝑇ℎ𝑒 tube is oscillating at 𝑓𝑟 at the peak of the n= 2 mode or 14 mode.
    Assume that the transit time through the gap and beam loading can be
    neglected.
    𝑎) Find the value of the repeller voltage 𝑉𝑅
    𝑏) Find the direct current necessary to give a microwave gap voltage of
    200V
    𝑐)What is the electronic efficiency under this condition?
    b) Define Velocity modulation and how velocity modulation changes to current (10)
    density modulation in Klystron Amplifier:-
    PART B
    Answer any two full questions, each carries 15 marks.
    4 a) What are different types of waves generated in a TWT after interaction with (5)
    electron beam and RF signal:-.
    b) A travelling wave tube (TWT) operates under the following parameters: Beam (10)
    voltage, V0=3kV; Beam current, I0=30mA; Characteristics of helix,Z0=10Ω;
    Circuit length, N=50; Frequency, f=10GHz. Determine: (a) the gain parameter,
    C (b) the output power gain, Ap in decibels and (c) all four propagation
    constants.
    5 a) Draw the block diagram of a typical microwave bench setup and label all the (5)

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    B G1025 Pages: 2
    parts. What are the parameters that can be measured using the setup?
    b) With a schematic describe the operation of a four port circulator. Obtain the (10)
    simplified S matrix of a perfectly matched, lossless four port circulator
    6 a) Show that the magnitude of the velocity fluctuation of the electron beam is (5)
    directly proportional to the magnitude of the axial electric field in a helix TWT
    b) Derive the expression of scattering matrix for directional coupler. (10)
    PART C
    Answer any two full questions, each carries 20 marks.
    7 a) Derive the minimum detectable signal of a RADAR (5)
    b) a) A certain silicon microwave transistor has the following parameters. (7)
    Reactance Xc=1Ω, Transit time cut off frequency fr=4GHz, Maximum electric
    field Em=1.6x105V/cm, Saturation drift velocity Vs=4x105cm/s. Determine the
    maximum allowable power transistor can carry.
    b) How tunnel diode can be used as circulator.
    c) What are low noise front ends? Describe in detail the utility of low noise front (8)
    ends.
    8 a) What is Doppler effect. Derive the equation for doppler efficiency. (5)
    b) Explain in detail the principle of a GUNN diode. Draw the I V characteristics. (7)
    c) Derive the Radar range equation. (8)
    9 a) Explain the basic principles of radar system. (5)
    b) (i) Show that the product of the maximum unambiguous range Run and the first (3)
    blind speed ν1 is equal to c λ/4.
    (ii) A guided missile tracking radar has the following specifications (4)
    Transmitted Power = 400 kW ; Pulse repetition frequency = 1500 pps ; Pulse
    width = 0.8 µsec
    Determine Unambiguous range, Duty cycle, Average power and suitable
    bandwidth of the radar.
    c) (i) Prove that decrease in drift velocity with increasing electric field can lead to (5)
    the formation of a high field domain for microwave generation and
    amplification:-
    (ii) A certain silicon microwave transistor has the following parameters:
    Reactance = 1Ω, Transit-time cut off frequency = 4 GHz, (3)
    Maximum electric field = 1.6 × 105 V/cm, Saturation drift velocity = 4 × 105
    cm/s. Determine the maximum power that the transistor can carry
    ****

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