20. 2 III Year – I SEMESTER T P C 3+1 0 3 ANTENNAS AND WAVE PROPAGATION OBJECTIVES UNIT I ANTENNA FUNDAMENTALS: Introduction, Radiation Mechanism –single wire, 2 wire, dipoles, Current Distribution on a thin wire antenna.Antenna Parameters - Radiation Patterns, Which among the following is an application of high frequency? The number at the end within the bracket identifies which of the four multiple choice answers is the correct one. 12. What is meant by identical Point sources.? While a rigorous analysis of an antenna is highly mathematical, often a simplified analysis is sufficient for understanding the basic principles of operation of an antenna. Attenuation of this wave is directly affected by the constant of earth along which it travels. Write the potential function in different form. 59.At what distance from the dipole is the induction field equal to the radiation field? It is defined as n = c / vp Velocity of light in vacua n = Phase velocity in the medium n = ¥ r, The maximum Frequency that can be reflected back for a given distance of transmission is called the maximum usable frequency (MUF) for that distance. 21.Explain the concept of Reflection and refraction wavesby the ionosphere. The radiation field will be produced at a larger distance from the the current element ,where the distance from the centre of the dipole to the particular point is very large.It is also called as distant field or far field. 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. 23. D .Kraus Book). It depends on i. figures / diagrams, tables / values, answers / explanations and more. Graphical representation of the radial component of the pointing vector Sr at a constant radius as a function of angle is called power density pattern or power pattern. Electronics and Communication Engineering ECE FAQ Antennas and Wave Propagation Unit wise Two Marks, Short, Viva, Interviews Questions and Answers PDF Ground wave classified into two types. W’ = I2 R Rr = W’/ I2 Where Rr is a fictitious resistance called called as radiation resistance. 88 .Define frequency diversity Reception. Explain in detail about ionosphere propagation. It operates in 100MHz. [ ] a) Linear. It is defined as an antenna is a circuit device with a resistance and temperature on the one hand and the space device on the other with radiation patterns, beam angle ,directivity gain and aperture. Give the design equations. How wideband operation is possible with this antenna. Derive the expression for Permitivity and conductivity of ionized gas. Antenna Wave & Propagation - Important Questions with Answers Tapering is done from center to end. In retarded potentials, what factor of time delay is generally introduced in A & V equations? EM wave Acoustic wave TEM wave TE 10 wave 3. _Binomial Array:Tapering follows the coefficient of binomial series ._Dolph Tchebycheff Array: Tapering follows the coefficient of Tchebycheff polynomial. View awp-bitbank-pdf.docx from CSE 304 at National Institute of Technology, Warangal. Energy Loss in ionosphere. i. Which among the following is/are not present in free space? Computer Networks MCQ Questions and Answers with PDF Download is offered here so that you can prepare your exams better and score good marks for this chapter. 92. (Ae). Professionals, Teachers, Students and Kids Trivia Quizzes to … The lowest useful HF for a given distance and transmitter power is defined as the lowest frequency that will give satisfactory reception for that distance and power. Define dipole antenna. i. Curvature of earth. Tags. Interference of normal radiation & radio wave propagation, If the path difference of two waves with single source traveling by different paths to, arrive at the same point, is λ/2, what would be the phase difference between, Which ionization layer exists during day time & usually vanishes at night due to highest, What is the possible range of height for the occurrence of sporadic E-region with, layer of appleton region acts as a significant reflecting medium for, The knowledge of which parameter is sufficient for deriving the time varying, According to Webster’s dictionary, what is an. 10.Explain the different techniques used for tapering of arrays. Scattering aperture(As.) The exam of 100 Questions will be drawn from the Basic question bank (RIC-7). Polarization diversity. Antenna beamwidth is a measure of directivity of an antenna. 3. However, their powe… Finally the plane of polarization will usually have changed, this phenomenon is known as Faraday’ s rotation. 1. * To get Clear; figures / diagrams, tables / values, answers / explanations and more, download the Antennas and Wave Propagation Viva Short Questions and Answers PDF. 91. Page 5 MULTIPLE CHOICE QUESTIONS UNIT-3: ANTENNA ARRAYS 1. 1 cm – 10 cm c. 10 cm – 1 m d. 0.1 cm – 1 cm ANSWER: 1 cm – 10 cm 2) Which among the following is an application of high frequency? 2. iii. These objective type Antenna & Wave Propagation questions are very important for campus placement test, semester exams, job interviews and competitive exams like GATE, IES, PSU, NET/SET/JRF, UPSC and diploma. One of the physical aperture is a measure of directivity of a short note on Traveling antenna! They are Elliptical polarization, circular polarization and linear polarization antenna on it networks one! 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