Such an antenna is called as half-wave dipole antenna. All Exam Review. Antenna & Wave Propagation objective questions (MCQs) and answers for competitive & university exams. Mcqs in Wave propagation. 1) Which among the following exhibits perpendicular nature in TEM wave? The main disadvantage of these antennas is their relatively large size compared to other types of antennas. 24. Also provides professionals with materials for their lectures and practice exams. … Save my name, email, and website in this browser for the next time I comment. Subscribe to our mailing list and get interesting stuff and updates to your email inbox. 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. inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. 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. 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. The direction of the electric field vector. This antenna type is made with microstrip based design on PCB.Hence it is called as microstrip patch antenna. 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. 25. 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 … 200 kph. 6.53 dB b. Antenna beamwidth is a measure of directivity of an antenna. Electric field b. b. Spherical to plane wave. An antenna array is a radiating system, which consists of individual radiators and elements. Antenna array. 1) What is the wavelength of Super high frequency (SHF) especially used in Radar & satellite communication? Professionals, Teachers, Students and Kids Trivia Quizzes to … Below are the answers key for the Multiple Choice Questions in Antennas Part 1. Help me go forward with the same spirit. Following is the list of multiple choice questions in this brand new series: P In the case of rectangular antenna, width is approx. 26. 22. 1. Page 2 16. 27. Ratio of g p and g d b. Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Question 14. d. Lens. - Published on 01 Oct 15. a. Aperture. - Published on 01 Oct 15. a. The dipole antenna is cut and bent for effective radiation. ELECTRONICS IMPORTANT MCQ PDF-Antenna & Wave Propagation 1. The length of the total wire, which is being used as a dipole, equals half of the wavelength (i.e., l = λ/2). 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… Between this there will be insulating surface. If the antenna had a 100% radiation efficiency, all directivity would be converted to gain. What Is Radiation Resistance ? … the microstrip on the bottom, the slot in the middle, and the patch on the top. 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 . 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Antenna efficiency = Power radiated / Total input Power. For example, some patch antennas are approximately half a wavelength on each side. Fig. Microstrip antenna has a very thin metallic strip (patch) (t<< λ) generally or rectangular shape is placed on the above portion of the antenna. The efficiency of an antenna is defined as the ratio of power radiated to the total input power supplied to the antenna. Antenna Theory & propagation (EC-604A) MCQ type (marks 1) 1. Antenna aperture is same as----- [ ] 24. According to the geometry, how many sterdians are present in a full sphere? Maximum effective area to physical area c. Effective area to physical area d. physical area to effective area 2. A pinoybix mcq, quiz and reviewers. A pinoybix mcq, quiz and reviewers. The directivity of a patch can be estimated quite easily: Subscribe to our mailing list and get interesting stuff and updates to your email inbox. Typical half wave patches have efficiencies well above 90%. Home » Communications » Questions and Answers » Antennas » Answers ». MCQ quiz on Antenna and Wave Propagation multiple choice questions and answers on antenna and wave propagation MCQ questions quiz on antenna and wave propagation objectives questions with answer test pdf. The elements are placed so closely that each one lies in the neighbouring one’s induction field. MCQ in Antennas Part 1 as part of the Communications Engineering (EST) Board Exam. Patch antennas come in various shapes and sizes and consist of a patch of metal directly above a ground plane. DGS has been applied to antenna designs to suppress harmonics, cross polarization of a patch antenna, and to increase the isolation between antennas. , M I S T E . a. a. MCQ in Antennas Part 4 as one of the Communications Engineering topic. Which conversion mechanism is performed by parabolic reflector antenna? 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. In far field the angular field distribution is independent of a. 2: Typical radiation pattern of microstrip antenna. 1 m – 10 m b. Tutorial of solved problems for oral viva questions. Harikesh Yadav June 1, 2017 ECE MCQ PDF, General. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. a. Maxwell’s b. Lorentz c. Helmholtz d. Poisson’s ANSWER: Helmholtz 3) If the magnetic field component of a plane … The overall length of the antenna … Following is the list of multiple choice questions in this brand new series: MCQ in Antennas . … the patch and the aperture of the horn antenna in the role of the primarily radiator. Which antennas are renowned as patch antennas especially adopted for space craft applications? b. Microstrip. By focusing the radiated energy in one desired direction. Aperture efficiency of antenna is a. 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 …. 7.99 dB c. 8.55 dB d. 9.02 dB. 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? Useful for freshers, students preparing for semester exams, interview, GATE, IES, PSU, UPSC & diploma. Figure 5.27 shows an example of a patch antenna. The antenna may be excited using various methods (Pozar, 1992; Pozar and Schawbert, 1995). ANSWER: Spherical to plane wave. 2.6. (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);})(); 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. One common approach is to feed from a microstrip line, connecting the microstrip antenna at the center of one of its edges. Plane to spherical wave. Parabolic dish antenna. Marconi antenna. (HPBW). 23. , M I S O I . A patch antenna radiates power in certain directions and we say that the antenna has directivity (usually expressed in dBi). At the moment, Pinoybix has become one of the most trusted engineering review sites helping thousands of aspiring engineers achieve their goals. 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. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. 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? The antenna must pass all the power to the antenna in its pass bandwidth. This antenna is basically circular or rectangular area of copper separated by conducting ground plane. Explanation: A common way to increase bandwidth in the antenna is to use a version of the dipole antenna known as the conical antenna. 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. Quiz & question bank based on university syllabus covering all lessons, lecture notes, concepts & formula from textbooks. 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 Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. The direction of the electric field vector, 34. - … c. Both a and b. d. None of the above. The metal patch on the front surface can have various shapes, although a rectangular shape, as shown in Figure 6.17, is commonly used. 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? c. Array. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. Outside the radiation band S11ideally must be 0 dB which means reflecting all the incident power on the antenna… 1: Physical geometry of microstrip antenna Fig. This is the most widely used antenna because of its advantages. Each of this radiator, while functioning has its own induction field. Azimuth. The aperture-fed patch antenna consists of … Possible answers for question 1: … the patch and the coaxial probe in the role of feeding. Answer : The antenna is a radiating device in which power is radiated into space in the form of electromagnetic wave. Mcq type ( marks 1 ) 1 the multiple choice questions in brand. 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