Answer : The antenna is a radiating device in which power is radiated into space in the form of electromagnetic wave. Between this there will be insulating surface. In this chapter, we shall discuss about another important factor in the radiation pattern of an antenna, known as beam width.In the radiation pattern of an antenna, the main lobe is the main beam of the antenna where maximum and constant energy radiated by the antenna flows. Antenna beam width is an angular width in degrees, measured on the radiation pattern (major lobe) between points where the radiated power has fallen to half its maximum value .This is called as “beam width” between half power points or half power beam width. Magnetic field c. Direction of propagation d. All of the above ANSWER: All of the above 2) Which equations are regarded as wave equations in frequency domain for lossless media? Explanation: A common way to increase bandwidth in the antenna is to use a version of the dipole antenna known as the conical antenna. … the patch and the aperture of the horn antenna in the role of the primarily radiator. a. Each of this radiator, while functioning has its own induction field. - … c. Array. Help me go forward with the same spirit. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. This antenna type is made with microstrip based design on PCB.Hence it is called as microstrip patch antenna. Antenna & Wave Propagation objective questions (MCQs) and answers for competitive & university exams. Parabolic dish antenna. Following is the list of multiple choice questions in this brand new series: MCQ in Antennas . Such an antenna is called as half-wave dipole antenna. … the microstrip on the bottom, the slot in the middle, and the patch on the top. For example, some patch antennas are approximately half a wavelength on each side. Maximum effective area to physical area c. Effective area to physical area d. physical area to effective area 2. Antenna efficiency = Power radiated / Total input Power. I have been designing a micro strip patch antenna with inset feed and I have a few HFSS simulation questions Substrate dielectric: 3.5 Substrate height : 1.5mm Frequency: 2.5GHz I followed a particular video on YouTube to guide me, and used an online calculator for the width and length of patch… The length of the total wire, which is being used as a dipole, equals half of the wavelength (i.e., l = λ/2). 25. c. Both a and b. d. None of the above. The antenna may be excited using various methods (Pozar, 1992; Pozar and Schawbert, 1995). 26. 24. 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Microstrip antenna has a very thin metallic strip (patch) (t<< λ) generally or rectangular shape is placed on the above portion of the antenna. 1: Physical geometry of microstrip antenna Fig. Antenna array. A patch antenna radiates power in certain directions and we say that the antenna has directivity (usually expressed in dBi). ELECTRONICS IMPORTANT MCQ PDF-Antenna & Wave Propagation 1. Below are the answers key for the Multiple Choice Questions in Antennas Part 1. Figure 5.27 shows an example of a patch antenna. Plane to spherical wave. Narrowband MIMO Systems - In [ 42 ], a defected ground structure (DGS) consisting of concentric circular rings in different configurations is presented and its stop band characteristics are examined. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. Also provides professionals with materials for their lectures and practice exams. a. Maxwell’s b. Lorentz c. Helmholtz d. Poisson’s ANSWER: Helmholtz 3) If the magnetic field component of a plane … Antenna beamwidth is a measure of directivity of an antenna. , M I S T E . T e c h . Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna Arrays; 1) If a linear uniform array consists of 9 isotropic elements separated by λ/4, what would be the directivity of a broadside array in dB? A pinoybix mcq, quiz and reviewers. The direction of the electric field vector. Ratio of g p and g d b. Save my name, email, and website in this browser for the next time I comment. A 'skip zone' is: the distance between the antenna and where the refracted wave first returns to earth the distance between the far end of the ground wave and where the refracted wave first returns to earth (function() {var script=document.createElement("script");script.type="text/javascript";script.async =true;script.src="//telegram.im/widget-button/index.php?id=@allexamreview";document.getElementsByTagName("head")[0].appendChild(script);})(); Mcqs in Wave propagation. Which antennas are renowned as patch antennas especially adopted for space craft applications? 7.99 dB c. 8.55 dB d. 9.02 dB. The metal patch on the front surface can have various shapes, although a rectangular shape, as shown in Figure 6.17, is commonly used. 2: Typical radiation pattern of microstrip antenna. Fig. According to the geometry, how many sterdians are present in a full sphere? The patch structure and the ground plane are placed on the opposite phases of the antenna, and separated by a dielectric material sheet which is … MCQ in Antennas Part 1 as part of the Communications Engineering (EST) Board Exam. What Is Radiation Resistance ? Antenna aperture is same as----- [ ] Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. The aperture-fed patch antenna consists of … Possible answers for question 1: … the patch and the coaxial probe in the role of feeding. Microstrip patch antenna consists of a radiating patch on one side of a dielectric substrate (FR4) that has a ground plane (Cu) on the other side as shown in Fig. Harikesh Yadav June 1, 2017 ECE MCQ PDF, General. Coupling an antenna to a separate resonant circuit at a similar frequency is often done to increase its bandwidth, for instance in a slot-coupled patch. ANTENNAS AND WAVE PROPAGATION 2015 U N I T W I S E B I T B A N K –K .R A V E E N D R A M . Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. Marconi antenna. 200 kph. 6.53 dB b. The direction of the electric field vector, 34. The directivity of a patch can be estimated quite easily: 24. Beamforming is a technique that focuses a wireless signal towards a specific receiving device, rather than having the signal spread in all directions from a broadcast antenna, as it normally would. ANSWER: Spherical to plane wave. One common approach is to feed from a microstrip line, connecting the microstrip antenna at the center of one of its edges. 23. Which conversion mechanism is performed by parabolic reflector antenna? 22. - Published on 01 Oct 15. a. a. Multiple Choice Questions and Answers on Antenna & Wave Propagation Multiple Choice Questions and Answers By Sasmita January 14, 2017 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. This is the most widely used antenna because of its advantages. In far field the angular field distribution is independent of 2.6. Patch antennas come in various shapes and sizes and consist of a patch of metal directly above a ground plane. 1. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. 27. A pinoybix mcq, quiz and reviewers. 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. 1) Which among the following exhibits perpendicular nature in TEM wave? The antenna must pass all the power to the antenna in its pass bandwidth. The main disadvantage of these antennas is their relatively large size compared to other types of antennas. Coupling an antenna to a separate resonant circuit at a similar frequency is often done to increase its bandwidth, for instance in a slot-coupled patch. All Exam Review. MCQ in Antennas Part 4 as one of the Communications Engineering topic. we respect your privacy and take protecting it seriously, Multiple Choice Questions in Antennas Part 1, Series of Multiple Choice Questions in Electronics Systems and Technologies, Pinoybix Elex is officially on Google Play | First of …, Complete List of Reviewers to Pass Engineering Board Exam, MCQ in Power Plant Engineering Part 6 | ME Board …, MCQ in Power Plant Engineering Part 5 | ME Board …, MCQ in Power Plant Engineering Part 4 | ME Board …, MCQ in Power Plant Engineering Part 3 | ME Board …, MCQ in Power Plant Engineering Part 2 | ME Board …. The dipole antenna is cut and bent for effective radiation. Outside the radiation band S11ideally must be 0 dB which means reflecting all the incident power on the antenna… Aperture efficiency of antenna is a. Following is the list of multiple choice questions in this brand new series: P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. 1 m – 10 m b. b. Spherical to plane wave. d. Lens. At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. b. Microstrip. By focusing the radiated energy in one desired direction. a. Pinoybix.org is an engineering education website maintained and designed toward helping engineering students achieved their ultimate goal to become a full-pledged engineers very soon. The efficiency of an antenna is defined as the ratio of power radiated to the total input power supplied to the antenna. … This antenna is basically circular or rectangular area of copper separated by conducting ground plane. Azimuth. Question 14. Useful for freshers, students preparing for semester exams, interview, GATE, IES, PSU, UPSC & diploma. Tutorial of solved problems for oral viva questions. The overall length of the antenna … The elements are placed so closely that each one lies in the neighbouring one’s induction field. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. - Published on 01 Oct 15. a. Aperture. Professionals, Teachers, Students and Kids Trivia Quizzes to … Home » Communications » Questions and Answers » Antennas » Answers ». Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. Antenna Theory & propagation (EC-604A) MCQ type (marks 1) 1. Electric field b. Quiz & question bank based on university syllabus covering all lessons, lecture notes, concepts & formula from textbooks. , M I S O I . An antenna array is a radiating system, which consists of individual radiators and elements. 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