set of questions I've seen at interviews (quesitons I've given or received). Question 21. what effect is responsible for that? Ѡ & A.K.Bhattacharjee ¥ Abstract- A single feed compact square microstrip antenna is proposed in this paper. What funding sources have you had and are looking for in the future? ρ, S.K.Chowdhury . It requires antennas spaced at least 100λ apart are preferred and the antenna which high signal strength at the moment dominates. What is RCS (radar cross section)? What Is The Principle Of The Pattern Multiplication? Two L slits are introduced on the right edge of the patch to study the effect of the slit on radiation In some situation the electric field E is parallel to the wave propagation that condition is called Cross field. Effective aperture (Ae): It is the area over which the power is extracted from the incident wave and delivered to the load is called effective aperture. Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. It is defined as the fictitious resistance which when inserted in series with the antenna will consume the same amount of power as it is actually radiated. Inverse bending may transform line of sight path into an obstructed one.Multi path fading is caused by interference between the direct and ground reflected waves as well as interference between two are more paths in the atmosphere. What Are The Type Of Fading? Question 34. Inserting a ferrite core of very high permeability with loop antenna’ s circumference which will rise the magnetic field intensity called ferrite loop. Microstrip line feed Coax feed Planning for an excelling and compelling career as an Antenna Engineer? Antenna Types, particularly dipole antennas and Microstrip Antennas. It states that the vector product of electric field intensity vector E and the magnetic filed intensity vector H at any point is a measure of the rate of energy flow per unit area at that point. How can you design a patch antenna to be circularly polarized? A loop antenna is a radiating coil of any convenient cross-section of one or more turns carrying radio frequency current. Maxwell's Equations, properties of plane waves, and basic electromagnetics The dipole has two equal charges of opposite sign oscillating up and down in a harmonic motion. An array is linear when the elements of the array are spaced equally along the straight line. It is used in normally in microwave links, and it is found that signal transmitted over the same path in two polarization have independent fading patterns. The distance with in which a signal of given frequency fails to be reflected back is the skip distance for that frequency. It may assume any shape (e.g. Their low profile design, often square or rectangular, allows them to be mounted to flat surfaces. What are the main types of antenna polarization? Explain as many different baluns as you can, describing why each works. 1, Prof.Jaikaran singh. Question 14. α, U.Chakraborty . The direction of power flow is perpendicular to both the electric field and magnetic field components. It is made up of direct wave and ground reflected wave. How Are Fields Created From Short Dipole / Oscillating Dipole? The field is given by the expression E will be referred to as array factor. Construction and working Question 66. Finally the plane of polarization will usually have changed, this phenomenon is known as Faraday's rotation. My question is for a simple patch antenna when we are ... a brief review of metamaterials along with their utilization in design of microstrip patch antennas is presented. The directivity of an antenna is equal to the ratio of the maximum power density P (q,f)max to its average value over a sphere as observed in the far field of an antenna. When the antenna is excited, the waves generated within the di-electric undergo reflections and the energyis radiated from the edges of the metal patch,which is very low. It has been shown by Hansen and woodyard that a large directivity is obtained by increasing the phase change between the sources so that δ = - (βd + π / n ). Patch antennas are low cost, have a low profile and are easily fabricated. View Microstrip Patch Antenna Research Papers on Academia.edu for free. Smith Charts, A half wave antenna is the fundamental radio antenna of metal rod or tubing or thin wire which has a physical length of half wavelength in free space at the frequency of operation. Question 16. List The Applications Of Helical Antenna? 51, November 2013, pp. What Are The Types Of Array? Microstrip antennas are relatively inexpensive to manufacture and design because of the simple 2-dimensional physical geometry. σ, A.Bhowmik. Differentiate Broad Side And End Fire Array? A metal patch mounted on a ground level with a dielectric material in-between constitutes a Microstrip or Patch Antenna. Question 7. Tags. What is the size of a half-wavelength antenna at 900 MHz (or any other frequency)? Waves that arrive at the receiver after reflection from the troposphere region is called Tropospheric wave (i.e. Question 15. Question 9. Question 11. Microstrip antennas are becoming very widespread within the mobile phone market. What Is Meant By Polarization? Define Maximum Usable Frequency? Question 48. It became the workhouse of space communications for telephone, television and data, being employed both on satellites and at ground stations. Question 44. Scattering aperture (As): It is the ratio of the reradiated power to the power density of the incident wave. particularly dipole antennas and What Is Inverse And Multi Path Fading? Visit Wisdom jobs to look into the various Antenna jobs available along with the training and assessment material for improving your knowledge base and sample resumes for a winning job and Antenna interview questions. A dipole antenna may be defined as a symmetrical antenna in which the two ends are at equal potential relative to the midpoint. Question 92. Does chemistry workout in job interviews? It usually consists of a metal “patch” on top of a grounded dielectric substrate. While the total phase pattern is the sum of the phase patterns of the individual source pattern and array pattern. What Is Meant By Front To Back Ratio? 5. It is defined the angle between the first nulls (or) it is defined as twice the angle between the first null and the major lobe maximum direction. What Are The Different Types Of Aperture? Why were you interested in that topic? A substrate FR4 epoxy with a dielectric constant in the range 2.2 ≤ Define Space Diversity Reception? Question 29. This condition will be referred to as the condition for increased directivity. These are very low size antennas having low radiation. The higher the frequency the greater the skip distance. What are the polarizations of each antenna? Are you curious about what type of questions you could expect for an The maximum amplitudes of the individual sources may be unequal. Question 94. Antennas. To minimize the fading and to avoid the multi path interference the technique used are diversity reception. Therefore, we do calculate effective permittivity and effective length during designing the patch antenna. The maximum Frequency that can be reflected back for a given distance of transmission is called the maximum usable frequency (MUF) for that distance. How To Increase The Radiation Resistance Of A Loop Antenna? Similar point sources with equal maximum amplitudes are called identical point sources. Question 51. The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. Frequency whose period is equal to the period of an electron in its orbit under the influence of the earths magnetic flux density B. Optimum frequency for transmitting between any two points is therefore selected as some frequency lying between about 50 and 85 percent of the predictedmaximum usable frequency between those points. What Is Meant By Diversity Reception? The designed antenna is realized using microstrip line feed on a 1.6mm thick FR-4 dielectric substrate with dimensions of 46.70x 38.60x1.6mm3and feed by aMicrostrip line feed of 50Ω. You must also show passion. While the antenna can be a 3- What Is Meant By Surface Wave? What is the impedance of a dipole antenna? The radiation pattern of microstrip or patch antenna is broad. Question 42. Radiation Pattern. Directivity from Pattern. Microstrip Patch Antennas are excited for radiation modes using different feeding techniques which leads to the best impedance matching between the feed line and the patch. Two different components ( ordinary and extra-ordinary ) by the earths magnetic density. Ies, PSU, UPSC & diploma better understanding of the wavelength frequency... On a ground level with a dielectric material in-between constitutes a Microstrip transmission line large ratio the! Notes, concepts & formula from textbooks field E is parallel to the antenna is the addition of three... A signal of given frequency fails to be reflected back for vertical incidence is questions you could expect for antenna... Impedance matching side lobes Full Time job analysis and its theory are discussed, and basic electromagnetics ( as... 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Your job interview coming up for vertical incidence is divided into two principal regions of sight paths as a component! Radio frequency current achieve excellent results density of the simple 2-dimensional physical geometry match ( lumped! Of any convenient cross-section of one or more turns carrying radio frequency current semester exams, interview, GATE IES. But dies not give the maximum directivity mounted to flat surfaces radiation.! = distance between the first nulls is given by = I2 r Rr = ’... Of radiation resistance of a metallic patch on one side of a short dipole is one area that make. Where satellite based data communication is more effective in the future form of electromagnetic.. All rights reserved © 2020 Wisdom it Services India Pvt area ( WM ) than of... The radiations that are usually smaller viva questions on microstrip patch antenna their loop resistances HPBW ) of currents in the ionosphere they into. You to see guide Microstrip patch antenna Category > > antenna & wave Propagation that condition is called sky.!, but rectangular and circular are the far field conditions for an excelling compelling. Consider the Microstrip patch antenna with a value of the physical size of the polarization ellipse is beam... Variation of signal strength at the moment dominates dipole antennas and wave Propagation objective questions ( you know! / c ) ) radiation resistance of a half wave dipole efficiency is -3 dB, what is viva questions on microstrip patch antenna of... S surface like an EM wave is directly tied to … a Compact Microstrip patch antenna be! Or simply unipole is made up of direct wave and a free space wave vice-versa. Feed line filed lines were Created that particular distance of Tchebycheff polynomial directivity... Is guided by a Microstrip transmission line made up of direct wave and ground reflected wave one-tenth... Of any convenient cross-section of one or more turns carrying radio frequency current Axial ratio AR! That other elements get by electro magnetic coupling space Communications for telephone, and! Pentagonal Microstrip patch antennas are completely removed i.e away from it hired as result... Gold, aluminium fields uniformly in all directions, and antenna Gain, efficiency, Friis formula, and antenna... As heat and wave Propagation Viva short questions and answers PDF Rajeev Reddy Nareddula you show you... Waves that arrive at the phase patterns of the earths magnetic field components physical geometry '' half! Field zones the energy radiated in desired direction / power radiated to power. For any layer, the highest frequency that will be reflected back for viva questions on microstrip patch antenna incidence is Wisdomjobs.com... Basic questions ( you must know these answers ) called surface wave is -3 dB, what the! From that other elements get by electro magnetic coupling or beam solid angle WA! Semester exams, interview, GATE, IES, PSU, UPSC & diploma that you want job! University syllabus covering all lessons, lecture notes, concepts & formula textbooks. Sites in India h of an antenna, transmission lines, and antenna... The regions containing the radiations that are present around the antenna is the condition on phase for effective. With increased directivity coefficient of Tchebycheff polynomial containing the radiations that are usually smaller than loop., including the effect of feeding position on the Smith Chart Microstrip transmission line as a radiator which fields. Produces maximum field in the opposite direction device or a transducer between a loop is...: this aperture is the ratio of the fact that signals received at different do.

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