Anna University Chennai 2010-5th Sem B.E Electronics & Communication Engineering ./B.Tech , EMR/EMR , ester, Electronics and Communication Engineering, EC2305-TRANSMISSION LINES AND WAVE GUIDES,
B.E./B.Tech. DEGREE EXAMINATION,
NOVEMBER/DECEMBER 2010,
FIFTH Semester,
Electronics and Communication Engineering,
EC2305-TRANSMISSION LINES AND WAVE GUIDES,
REGULATION 2008 B.E.m.Th. DEGREE EXAMINATION, NOVEMBER/DECEMBER $10 Filth Semester Electronics and Communication Engi EC 2305 TRANSMISSION LINES AND WAVEGUl\ES / (Regulation 200S)
Time: Three hours
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Reg. No. |
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Maximum: 100 Marks
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equency of 10 KHz. The ro(L. |
Answer .
PART A (10
1. A constant-K T*section high pass fil design impedance is 600 ohm.
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5. A lossless line has a charaefcerisde impedance of 400 ohms. Determine the standing wave ratio if the receiving end impedance is 800 +j 0.0 ohms. |
2. What are the advantages
3. Define delay distortion
4. Write the express: telephone cable.
tant and velocity of propagation for
6. Write the expressions for the input impedance of open and short circuited dissipajjg
fluency for the guided waves.
GHz and plane separation of 3 cm, find the group and he dominant mode.
he cutoff wavelength for the TMh mode in a standard rectangular = 4.5 cm.
plications of cavity resonators.
PART B (5 x 16 = 80 Marks)
11. (a) (i) Design a m-derived T*section low pass filter having frequency (fc) of 5000 Hz and a design impedance of 600oh frequency of infinite attenuation is 1.25 &.
(ii) Draw and explain the operation of crystal Alters.
Or
(b) (i) Design a constanl-K T-scction band frequencies of 1 KHz and <t KHz. The des
(8) lain the <>
(ii) Draw a constant-K T-section band elimination filte operation with necessary design equations.
12. (a) (i)
(i)
The characteristiimpwi lyjfform transmission line is
2309.6 ohms alJa frequei 0>1Hz. At this frequency, the
propagation coiBtanrfkC > + j 0.99). Determine Rand L.
(6)
Explain tbfET > liny not terminated in characteristic
impedarae with afeins. Define reflection coefficient and
roflortir*! (10)
(b) (i)
(ii)
13. (a)
(i)
(ii)
Draw and explain|the oration of quarter wave line. (8)
It is required to mhi 200 ohms load to a 300 ohms transmission line to reduce the SWR along the line to 1. What must be the characteristic impedance of the quarter wave transformer used for this purpose if it is directly connected to the load? (4)
Wnltare the drawbacks of single stub matching and open circuited
(4)
Or
d explain the principle of double stub matching. (8)
A UHF lossless transmission line working at I GHz is oonnectcd to unmatched line producing a voltage reflection coefficient of [5(0.866 + j 0.5). Calculate the length and position of the stub to match the line. (8)
A transmission line has the following per unit length parameters :
L = 0.1jM H, R =5 ohms. C = 300 pF and G = 0.01 mho. Calculate the propagation constant and cjMrt9R9ria(ic impedance at 500 MHz. (8) Derive the conditions reqpirefiMdistfltionless line. (8)
14. (a) (i) Explain the transmission of TE waves between parallel conducting planes with ncccssary expressions and diagra: field components.
(ii) A TEM wave at 1 MHz propagates in the conducting planes which is filled with dielectric and e,- 2. Find the phase constant and c\ impedance.
Or
(b) (i) Explain the reasons for the attenuate between parallel planes with nccessary e
(ii) Write a brief note on the manner of wave travel an between parallel planes.
15. (a)
(i) Discuss the propagation of TM waves in a rectangular waveguide with relevant expressions and diagrams for the field components.
(10)
(ii)
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A rectangular waveguie internally has a 9 GHz : wavelength, phase an< impedance for the dominant ,= 4.5 cm and b = 3 cm n it. Calculate the guide locftics and characteristic (6) (b) Explain the propa waveguide with suitable cxpre 
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 Anna University Chennai 2010-5th Sem B.E Electronics & Communication Engineering ./B.Tech , EMR/EMR , ester, Electronics and Communication Engineering, EC2305-TRANSMISSION LINES AND WAVE GUIDES,
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