microwave engineering
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Code No: V3220/R07 Set No. 1 III B.Tech II Semester Regular Examinations, April 2010 MICROWAVE ENGINEERING (Electronics & Communication Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks 1. (a) Mention different microwave regions & band designations. (b) Discuss the war and peace time applications of microwaves. [8+8] 2. (a) An air filled circular W.G is to be operated at a frequency of 6 GHz and is to have dimensions such that f c = 0.8 f for the dominant mode. Determine i. The diameter of the guide ii. Guide wave length λg iii. Phase velocity in the guide (b) Discuss the merits and demerits of circular wave guide over rectangular wave guide. [8+8] 3. (a) Sketch a 4 port hybrid junction and justify that it is a basically a 3 dB direc- tional coupler. (b) A matched generator with a power of one watt is connected to the H arm of magic tee C (port 4). The E arm (port 3) is match terminated and the length of the coplanar arms is the same. Compute the power delivered to the termination at port 1, 2 and 3 and the power reflected at port 4 when ports 1 and 2 are match terminated. [8+8] 4. (a) Define scattering parameters for two port microwave junction. Explain the significance of S parameters. (b) Derive the scattering matrix of a two hole directional coupler. [8+8] 5. (a) A reflex klystron has following parameters: V 0 = 800v, L =1.5mm, R sh = 15k - 2,f =9GHZ. Calculate i. The repeller voltage fro which the tube can oscillate in 1 3 4 mode. ii. The direct current necessary to give a microwave gap voltage of 200V. iii. Electron efficiency. (b) Name different methods of generating microwave power. Describe the neces- sary theory & Working of reflex klystron. [8+8] 6. (a) The TWT operates under following parameters: Beam Voltage V o =3KV, Beam current Io = 30mA, characteristic Impedance of helix Z o = 10 Ω ,circuit length=50 & frequency f =10 GHz. Determine i. Gain parameter ii. Output power gain in dB. 1 of 2 Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark. www.U www.U dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org www.U www.U dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org dIStar.org www.UandIStar.org www.UandIStar.org
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Transcript of microwave engineering
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Code No: V3220/R07 Set No. 1
III B.Tech II Semester Regular Examinations, April 2010MICROWAVE ENGINEERING
(Electronics & Communication Engineering)Time: 3 hours Max Marks: 80
Answer any FIVE QuestionsAll Questions carry equal marks
? ? ? ? ?
1. (a) Mention different microwave regions & band designations.
(b) Discuss the war and peace time applications of microwaves. [8+8]
2. (a) An air filled circular W.G is to be operated at a frequency of 6 GHz and is tohave dimensions such that fc = 0.8 f for the dominant mode. Determine
i. The diameter of the guide
ii. Guide wave length g
iii. Phase velocity in the guide
(b) Discuss the merits and demerits of circular wave guide over rectangular waveguide. [8+8]
3. (a) Sketch a 4 port hybrid junction and justify that it is a basically a 3 dB direc-tional coupler.
(b) A matched generator with a power of one watt is connected to the H armof magic tee C (port 4). The E arm (port 3) is match terminated and thelength of the coplanar arms is the same. Compute the power delivered to thetermination at port 1, 2 and 3 and the power reflected at port 4 when ports 1and 2 are match terminated. [8+8]
4. (a) Define scattering parameters for two port microwave junction. Explain thesignificance of S parameters.
(b) Derive the scattering matrix of a two hole directional coupler. [8+8]
5. (a) A reflex klystron has following parameters:V0 = 800v, L = 1.5mm, Rsh = 15k 2, f = 9GHZ. Calculate
i. The repeller voltage fro which the tube can oscillate in 134mode.
ii. The direct current necessary to give a microwave gap voltage of 200V.
iii. Electron efficiency.
(b) Name different methods of generating microwave power. Describe the neces-sary theory & Working of reflex klystron. [8+8]
6. (a) The TWT operates under following parameters: Beam Voltage Vo=3KV,Beam current Io = 30mA, characteristic Impedance of helix Zo = 10 ,circuitlength=50 & frequency f =10 GHz. Determine
i. Gain parameter
ii. Output power gain in dB.
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Code No: V3220/R07 Set No. 1
(b) Give necessary theory for amplification of microwaves by 0-type TWT. Inwhat respect is it superior to Klystron two cavity amplifier. [8+8]
7. (a) Derive the criterion for classifying the modes of operation for Gunn effectdiodes
(b) An n-type GaAs Gunn diode has following parameters
Electron drift velocity Vd = 2.5 105m/s
Negative Electron mobility |n| = 0.015 m2/ v s
Relative dielectric constant r = 13.1Determine the criterion for classifying the modes of operation. [8+8]
8. (a) Explain with neat block diagram the operation and working of network analyser.
(b) A slotted line is used to determine the SWR value of a waveguide. Adjacentnull position are located at 13.31 CM 15.45 CM. If the seperation between thetwice-minimum power points is 2mm, what is the value of the SWR? [8+8]
? ? ? ? ?
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Code No: V3220/R07 Set No. 2
III B.Tech II Semester Regular Examinations, April 2010MICROWAVE ENGINEERING
(Electronics & Communication Engineering)Time: 3 hours Max Marks: 80
Answer any FIVE QuestionsAll Questions carry equal marks
? ? ? ? ?
1. (a) Obtain the field equations of rectangular wave guides in TEmn modes.
(b) An air field rectangular wave guide of dimensions (73.5 cm) operates in thedominant TE10 mode.
i. Find the cut off frequency
ii. Find the phase velocity of the wave in the guide at the frequency of 3.5GHz.
iii. Determine the guided wave length at the same frequency. [16]
2. (a) An air filled circular W.G is to be operated at a frequency of 6 GHz and is tohave dimensions such that fc = 0.8 f for the dominant mode. Determine
i. The diameter of the guide
ii. Guide wave length g
iii. Phase velocity in the guide
(b) Discuss the merits and demerits of circular wave guide over rectangular waveguide. [8+8]
3. (a) Write short notes on Wave guide windows ( Irises).
(b) Show a wave guide with cylindrical post and describe its behavior. How canit be used, when it is inserted half way in to the wave guide. [8+8]
4. (a) What is the necessity of S-matrix representation of microwave component?
(b) Derive the S-matrix of directional coupler in standard form. [8+8]
5. (a) Why do practical klystron amplifiers generally have more than two cavites?How can broad band operation be achieved in multicavity klystron.
(b) Explain how bunching takes place in klystron amplifier around the electronwhich passes the bucher cavity gap when the gap voltage is zero & becomingpositive. [8+8]
6. (a) Draw the operating characteristics of magnetron and explain.
(b) The parameters of linear magnetron areVo=15KVIo=1.2ABo=0.16TSeperation between cathode and anode= 4cm.Find the hulls cut off voltage. [8+8]
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Code No: V3220/R07 Set No. 2
7. (a) Derive the equation for power output & efficiency of IMPATT diode.
(b) Determine the conductivity of n-type Ga As Gunn diode ifElectron density n = 1018 cm3
Electron density at lower valley nl = 1010 cm3
Electron density at upper valley nu = 108 cm3
Temperature T = 300oK. [8+8]
8. (a) The cablibrated power from a generator as read at the power meter is 25mw.When a 3dB attenuator with a VSWR of 1.3/1 is inserted between the gener-ator and detector what value should the power meter read.
(b) Compare the power ratio and RF substitution methods of measuring attenu-ation provided by the microwave component. [8+8]
? ? ? ? ?
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Code No: V3220/R07 Set No. 3
III B.Tech II Semester Regular Examinations, April 2010MICROWAVE ENGINEERING
(Electronics & Communication Engineering)Time: 3 hours Max Marks: 80
Answer any FIVE QuestionsAll Questions carry equal marks
? ? ? ? ?
1. (a) Starting with the equation for the propagation constant of a mode in rectan-gular wave guide, derive the expression = gc
g2+c2
Where g is guide wave length and c is cut off wave length
(b) An air filled rectangular wave guide has the dimensions of 4 and 3 cm and issupporting TE10 mode at a frequency of 9800 MHz. Calculate
i. The wave guide impedance
ii. The percentage change in the impedance for a 10% increase in the oper-ating frequency. [8+8]
2. (a) Explain how a rectangular cross section of a micro strip line can be transformedin to equivalent circular conductance.
(b) In the above transformation, what is the significance of t/w ratio. [8+8]
3. (a) Sketch a 4 port hybrid junction and justify that it is a basically a 3 dB direc-tional coupler.
(b) A matched generator with a power of one watt is connected to the H armof magic tee C (port 4). The E arm (port 3) is match terminated and thelength of the coplanar arms is the same. Compute the power delivered to thetermination at port 1, 2 and 3 and the power reflected at port 4 when ports 1and 2 are match terminated. [8+8]
4. (a) Explain the properties of scattering matrix.
(b) Determine scattering matrix for the following junction as shown in figure 4b[8+8]
Figure 4b
5. (a) A reflex klystron has following parameters:V0 = 800v, L = 1.5mm, Rsh = 15k 2, f = 9GHZ. Calculatei. The repeller voltage fro which the tube can oscillate in 13
4mode.
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Code No: V3220/R07 Set No. 3
ii. The direct current necessary to give a microwave gap voltage of 200V.
iii. Electron efficiency.
(b) Name different methods of generating microwave power. Describe the neces-sary theory & Working of reflex klystron. [8+8]
6. (a) Give the different types & explain the characteristics of slow wave structure.
(b) A TWT operates with following parameters:Vb=2.5KV, Ib=25mA, Zo=10 , circuit length,L=50,f=9GHzFind the gain parameter & power gain. [8+8]
7. (a) Derive the criterion for classifying the modes of operation for Gunn effectdiodes
(b) An n-type GaAs Gunn diode has following parameters
Electron drift velocity Vd = 2.5 105m/sNegative Electron mobility |n| = 0.015 m2/ v sRelative dielectric constant r = 13.1Determine the criterion for classifying the modes of operation. [8+8]
8. (a) The cablibrated power from a generator as read at the power meter is 25mw.When a 3dB attenuator with a VSWR of 1.3/1 is inserted between the gener-ator and detector what value should the power meter read.
(b) Compare the power ratio and RF substitution methods of measuring attenu-ation provided by the microwave component. [8+8]
? ? ? ? ?
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Code No: V3220/R07 Set No. 4
III B.Tech II Semester Regular Examinations, April 2010MICROWAVE ENGINEERING
(Electronics & Communication Engineering)Time: 3 hours Max Marks: 80
Answer any FIVE QuestionsAll Questions carry equal marks
? ? ? ? ?
1. (a) Mention different microwave regions & band designations.
(b) Discuss the war and peace time applications of microwaves. [8+8]
2. (a) State the factors up on which the attenuations constant of a parallel strip lineare dependent.
(b) Derive an expression for the attenuation factor of a micro strip line. [8+8]
3. (a) Explain the functioning of flap and vane attenuators.
(b) Explain the working principle of dielectric phase shifter with a neat sketch.How can the phase shift be varied. [8+8]
4. (a) Scattering matrix is a unitary matrix. Prove this statement.
(b) Obtain the S - matrix for a magic Tee with respect its properties. [8+8]
5. (a) For 4.75 mode the repeller voltage is -125v. Find the repeller voltage of Reflexklystron for 5-75 mode if the anode voltage V0=300v.
(b) Draw the mode curves of Reflex klystron & derive the relation between modenumber & repeller voltage in Reflex klystron. [8+8]
6. (a) A helix TWT operates at 4GHz under beam Voltage 10KV,& beam current500mA. If helix impedance is 25 &interaction length is 20CM, find the outputPower gain in dB.
(b) Explain the power output ,gain & phase shift characteristics of TWT amplifier.[8+8]
7. (a) Derive the criterion for classifying the modes of operation for Gunn effectdiodes
(b) An n-type GaAs Gunn diode has following parameters
Electron drift velocity Vd = 2.5 105m/s
Negative Electron mobility |n| = 0.015 m2/ v s
Relative dielectric constant r = 13.1Determine the criterion for classifying the modes of operation. [8+8]
8. (a) The cablibrated power from a generator as read at the power meter is 25mw.When a 3dB attenuator with a VSWR of 1.3/1 is inserted between the gener-ator and detector what value should the power meter read.
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Code No: V3220/R07 Set No. 4
(b) Compare the power ratio and RF substitution methods of measuring attenu-ation provided by the microwave component. [8+8]
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2 of 2Please purchase PDF Split-Merge on www.verypdf.com to remove this watermark.
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