Free PDF download of jobs, exams and tests; E-books, materials, notes, previous solved papers, questions and answers with explanations, FAQ, MCQ, etc. GATE 2019 ECE syllabus contains Engineering mathematics, Signals and Systems, Networks, Electronic Devices, Analog Circuits, Digital circuits, Control Systems, Communications, Electromagnetics, General Aptitude. It is defined as the ratio of the power radiated in desired direction to the power radiated in the opposite direction. Explain Radiation pattern (june/july08) A radiation pattern defines the variation of the power radiated by an antenna as a function of the direction away from the antenna. 26. 73.What are the parameters to be considered for the design of an helical antenna? Answer : Waves propagated over other paths near the earth surface is called ground wave propagation. Explain the geometry of a log periodic antenna. In uniform linear array as the array length is increased to increase the directivity, the secondary lobes also occurs. The applications of helical antenna are: . 30. Questions provided here are the Expected questions that are possible to be appeared in the upcoming … Antenna is also said to be an impedance transforming device. antenna and wave propagation questions with answers multiple choice questions antennas and wave propagation. When these modes re-emerge from the ionosphere they recombine into a single plane wave again. Finally the plane of polarization will usually have changed, this phenomenon is known as Faraday’ s rotation. ANSWER: 1 cm – 10 cm. 6.What are the different types of aperture.? 85. This aperture is a measure of the physical size of the antenna. Gain 3. 4.Gives notes on the antenna impedances. 9.Explain the principle of pattern multiplication with some examples. rectangular,square,triangular and hexagonal), 67.Give an expression of radiation resistance of a small loop Radiation resistance of a small loop is given by Rr=31,200 (A/_ 2)2, 68.How to increase the radiation resistance of a loop antenna. 84. 3. 1 cm – 10 cm C. 10 cm – 1 m D. 0.1 cm – 1 cm. List the arrays used for array tapering . The basic requirements of transmitting antennas are: a) High efficiency b) Low side lobes c) Large signal to noise ratio d) Lone of the mentioned View Answer. WA = ò ò4p Pn ( q,f ) dW ,Where dW = Sin q d q .df. a) Linear. Question 70. What is meant by identical Point sources.? 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? The distance with in which a signal of given frequency fails to be reflected back is the skip distance for that frequency.The higher the frequency the greater the skip distance. Basics of Antennas, Dipole Antennas, Radiation Pattern, Antenna Gain. i. Scattering aperture. In this array the elements are fed parasitically to reduce the problem of feed line. Radio waves are easy to generate and are widely used for both indoor and outdoor communications because of their ability to pass through buildings and travel long distances. 33.i) Write a short note on Traveling wave antenna. ii) Explain the term pattern multiplication. A. SONAR 16. Hey buddies, I am here sharing the PDF eBook and notes for Antenna & wave propagation (AWP) for Electronics Engineering students. Impedance 4. Directivity from Pattern. ExamSIDE.Com. 1 m – 10 m B. 31:09. Antenna arrays are used to increase the gain of the antenna.. Forgot Password? TQ, visit us again. Derive the expression for calculating field strength at a distance in space wave Propagation. Anna University EC6602 Antenna and Wave propagation Syllabus Notes 2 marks with answer is provided below. Answer: a Explanation: The basic requirements of a transmitting antenna are high gain and efficiency while requirements of receiving … Sorry, preview is currently unavailable. wave velocity vp = c / ¥__- (fc / f)2 Group velocity, vp vg = c2 vg = c2 / vp. 23. The Correct Answer Among All the Options is B Given , a=75mm b=37.5mm As we know, guide wavelength in rectangular waveguide, Cut-off frequency is given by , And Cut-off frequency in case of air-filled waveguide , For mode, For mode, Now, = On solving we get, Refer the Topic Wise Question for Waveguides Electromagnetics 75.Which antenna will produce circularly polarized waves Helical antenna radiates circularly polarized wave. While the total phase pattern is the sum of the phase patterns of the individual source pattern and array pattern.0, 44.What is the advantage of pattern multiplication? antenna-and-wave-propagation-question-bank-with-answers-pdf 1/1 Downloaded from ons.oceaneering.com on December 22, 2020 by guest Download Antenna And Wave Propagation Question Bank With Answers Pdf Right here, we have countless books antenna and wave propagation question bank with answers pdf and collections to check out. Axial mode of operation. Subject: Antenna and Wave Propagation 4. Antenna Wave & Propagation - Important Questions with Answers b. It is made up of direct wave and ground reflected wave. Structure of ionosphere, Refraction and Reflection of Sky Waves by ionosphere, Ray Path, Critical Frequency, MUF, LUF, OF, Virtual Hlght and Skip Distance. i.e Maximum radiation intensity from test antenna Gain (G) = --------------------------------------------------------, ----------------------- Maximum radiation intensity from the reference antenna with same input power. What is meant by front to back ratio.? iii. Radiation pattern is the relative distribution of radiated power as a function of distance in space .It is a graph which shows the variation in actual field strength of the EM wave at all points which are at equal distance from the antenna. Pal once much knowledge remain in the form of electromagnetic wave 39.what is the area over which the direction. The technique used are diversity reception setting thus bored around the earth surface is called wave... 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