viva questions on microstrip patch antenna

What Is Meant By Isotropic Radiator? The effective height h of an antenna is the parameter related to the aperture. When these modes re-emerge from the ionosphere they recombine into a single plane wave again. Question 9. Antenna is also said to be an impedance transforming device. Discuss how you would impedance match both bands. Question 87. The distance with in which a signal of given frequency fails to be reflected back is the skip distance for that frequency. A dipole antenna may be defined as a symmetrical antenna in which the two ends are at equal potential relative to the midpoint. Are you curious about what type of questions you could expect for an 1, Prof.Jaikaran singh. Differentiate Broad Side And End Fire Array? This effect is called mutual coupling and results in mutual impedance. This is called as "beam width" between half power points or half power beam width.(HPBW). The efficiency of an antenna is defined as the ratio of power radiated to the total input power supplied to the antenna. Also includes the portion of energy received as a result of diffraction around the earth surface and the reflection from the upper atmosphere. Antenna efficiency = Power radiated / Total input Power. The ratio of the major to the minor axes of the polarization ellipse is called the Axial Ratio (AR). Increasing Microstrip Patch Antenna Bandwidth by Inserting Ground Slots Yahya S. H. Khraisat Department of Electrical and Electronics Engineering, Al-Huson University College, Al -Balqa’ Applied University, Al-Huson, Jordan Abstract Microstrip patch antenna (MPA) is widely implemented in different commu-nication systems. Give The Expression For The Effective Aperture Of A Short Dipole? Directivity from beam area (WA). View Microstrip Patch Antenna Research Papers on Academia.edu for free. The polarization are three types. Absorption character of ionosphere for the paths between transmitter and receiver. What Is Inverse And Multi Path Fading? To minimize the fading and to avoid the multi path interference the technique used are diversity reception. The radiation resistance of a half wave dipole is given by. Antenna Engineer Interview Questions. Antennas. Waves propagated over other paths near the earth surface is called ground wave propagation. Making a great Resume: Get the basics right, Have you ever lie on your resume? What is the relationship between the speed of light, frequency and wavelength? How To Increase The Radiation Resistance Of A Loop Antenna? Question 94. D = P (q,f)max / P(q,f)av. 3. Question 92. This distance is given by r = 0.159 λ. 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. What Are The Types Of Array? This field is more effective in the vicinity of the current element only. Question 38. Question 17. What Are Electrically Small Loop Antennas? 2, Prof.Mukesh Tiwari. Keywords † Microstrip patch anten na, Rectangu lar patch, 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. i.e Maximum radiation intensity from test antenna (G)= Maximum radiation intensity from the reference antenna with same input power. D = 4p / WA. What Is Meant By Front To Back Ratio? Inserting a ferrite core of very high permeability with loop antenna’ s circumference which will rise the magnetic field intensity called ferrite loop. α, U.Chakraborty . Abstract —Due to the existence of growth in development of low cost, less weight, highly reliable, minimal profile antennas for wireless When δ = - β d, produces maximum field in the direction φ = 0 but dies not give the maximum directivity. Question 14. This method takes advantage of the fact that signals of slightly different frequencies do not fade synchronously. In some situation the electric field E is parallel to the wave propagation that condition is called Cross field. Define Magneto-ions Splitting? Basically, a microstrip patch antenna is composed of a trace of copper or any other metal of any geometry on one side of a standard printed circuit board (PCB) substrate with other side grounded. 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. Question 44. It is an array in which the amplitudes of the antenna elements in the array are arranged according to the coefficients of the binomial series. Fading is variation of signal strength occur on line of sight paths as a result of the atmospheric conditions. End fire array is defined as an arrangement in which the principal direction of radiation is coincides with the array axis. The length of the metal patch is λ/2. Here are a set of actual antenna engineer interview questions, to give you an idea. What is the impedance of a dipole antenna? Related review on Microstrip Patch Antennas 10 B)Microstrip Patch Antenna Design: Microstrip patch antenna consists of very thin metallic strip placed on ground plane where the thickness of metallic strip is restricted by t<< λ 0 and the height is restricted by0.0003λ 0 ≤ .05λ 0 (where λ 0 is wavelength) Question 48. Electrically Small (Circumference < λ / 10 ), Electrically Small (Dimension comparable to λ ). 1. If an e.m.f is applied to the terminals of an antenna no.1 and the current measured at the terminals of the another antenna no.2, then an equal current both in amplitude and phase will be obtained at the terminal of the antenna no.1 if the same emf is applied to the terminals of antenna no.2. Make sure transmission lines, and impedance matching. The total beam area (WA) consists of the main beam area (WM) plus the minor lobe area (Wm). Tapering is done from center to end. For certain applications, it is highly desirable that secondary lobes should be eliminated completely or reduced to minimum desirable level compared to main lobes. Give The Expression For The Effective Aperture Of A Half Wave Dipole? Question 84. Antenna Measurements. Graphical representation of the radial component of the poynting vector Sr at a constant radius as a function of angle is called power density pattern or power pattern. Efficiency, 3 . What Do You Understand By Retarded Current? These are very low size antennas having low radiation. The fields around an antenna ay be divided into two principal regions. They are Elliptical polarization ,circular polarization and linear polarization. The total field pattern of an array of non isotropic but similar sources is the product of the. Question 7. The antenna appears to the transmission line as a resistive component and this is known as the radiation resistance. 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. where β = 2Π / λ and d = distance between the elements. For any layer, the highest frequency that will be reflected back for vertical incidence is. However, a distance reaches from the conductor at which both the induction and radiation field becomes equal and the particular distance depends upon the wavelength. Question 81. microstrip patch antenna is obtained from the following equations from (1) to (4).The microstrip patch antenna width(w) and antenna’s effective dielectric constant ( ) of the patch can be resolute through the equation (1) and (2). The geometry of the designed microstripline feed microstrip patch antenna is as shown in fig.5. The power radiated from an antenna per unit solid angle is called the radiation intensity U (watts per steradian or per square degree). Question 78. break a hiring decision. you show that you want the job and like (or better yet, love) what you do. What is the FCC limit on SAR? What Is The Need For The Binomial Array? Physical aperture (Ap): This aperture is a measure of the physical size of the antenna. Planning for an excelling and compelling career as an Antenna Engineer? 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. Related Content. The amplitude of currents in the linear array source is non-uniform; hence the central source radiates more energy than the ends. It can not be predicted properly. It is made up of direct wave and ground reflected wave. What Are The Type Of Ground Wave? Question 74. Design Microstrip Patch Antenna with coaxial feeding. Define Maximum Usable Frequency? Directivity, The co -axial feed antenna resonated at 2.4GHz and Microstrip lin e fed antenna resonated at 2.404GHz. source having the same amplitude and phase. What Is Meant By Reciprocity Theorem? What Is Meant By Similar Point Sources? Normally the electric field E is perpendicular to the direction of wave propagation. What is the size of a half-wavelength antenna at 900 MHz (or any other frequency)? Microstrip antennas are becoming very widespread within the mobile phone market. Also the return loss of pentagonal patch is comparable with elliptical patch… Planning for an excelling and compelling career as an Antenna Engineer? What Is The Difference Between Isotropic And Non-isotropic Source? W’ = I2 R Rr = W’/ I2 Where Rr is a fictitious resistance called called as radiation resistance. Question 56. In this array the elements are fed parasitically to reduce the problem of feed line. What Are The Factors That Affect The Propagation Of Radio Waves? What research are you looking to do in the future? Which antennas are renowned as patch ... c. Array. The radiation intensity is independent of distance. I am currently working on Rectangular Patch Antenna when fed with Proximity coupling. 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. The Microstrip patch antennas are well known for their performance and their robust design, fabrication and their extent usage. What is 1 mW in dBm? When the antenna is receiving with a load resistance matched to the antenna radiation resistance, maximum power is transferred to the load and the power is also re-radiated from the dipole. It became the workhouse of space communications for telephone, television and data, being employed both on satellites and at ground stations. Scattering aperture (As): It is the ratio of the reradiated power to the power density of the incident wave. Question 75. Question 21. Question 66. Question 70. of (1) Where satellite based data communication. Self impedance of an antenna is defined as its input impedance with all other antennas are completely removed i.e away from it. Antenna Polarization should all be known. Waves that arrive at the receiver after reflection in the ionosphere is called sky wave. What are avoidable questions in an Interview? The energy radiated in a particular direction by an antenna is measured in terms of FIELD STRENGTH. Question 47. Question 12. Due to the earth’ s magnetic fields, the ionosheric medium becomes anisotropic and the incident plane wave entering the ionosphere will split into ordinary and extra ordinary waves/modes. Specifically, This field is also known as near field. How Are Fields Created From Short Dipole / Oscillating Dipole? The patch antennas are popular for low profile applications at frequencies above 100MHz. Why is it important? 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. The radiation pattern of This is one area that can make or Question 28. 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. antenna engineer interview? Ѡ & A.K.Bhattacharjee ¥ Abstract- A single feed compact square microstrip antenna is proposed in this paper. Patch antennas are low cost, have a low profile and are easily fabricated. Question 76. How can you design a patch antenna to be circularly polarized? Which antennas are renowned as patch antennas especially adopted for space craft ... Microstrip - Patch antennas. 3.1 Introduction 6 things to remember for Eid celebrations, 3 Golden rules to optimize your job search, Online hiring saw 14% rise in November: Report, Hiring Activities Saw Growth in March: Report, Attrition rate dips in corporate India: Survey, 2016 Most Productive year for Staffing: Study, The impact of Demonetization across sectors, Most important skills required to get hired, How startups are innovating with interview formats. A short dipole is one in which the field is oscillating because of the oscillating voltage and current. Antenna Gain, 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. Do you have employment gaps in your resume? Electrical and Electronics Engineering Interview Questions, EDI (electronic data Interchange) Interview Questions, Microwave Engineering Interview Questions, Electrical and Electronics Engineering Practice Tests, EDI (electronic data Interchange) Practice Tests, Business administration Interview questions, Cheque Truncation System Interview Questions, Principles Of Service Marketing Management, Business Management For Financial Advisers, Challenge of Resume Preparation for Freshers, Have a Short and Attention Grabbing Resume. Additional benefits of patch antennas is that they are easily fabricated making them cost effective. Wireless Communication. What Is The Advantage Of Pattern Multiplication? The radiation resistance of a loop antenna can be increased by: Question 64. Industry Specific - Defense Department Jobs. Question 51. Question 6. If the TIS Similar point sources with equal maximum amplitudes are called identical point sources. What is the difference between a loop antenna and a folded dipole antenna? 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. This is why we allow the books compilations in this website. The effective aperture of a short dipole is given by. directional,Both the antennas were fabricated using FR4 of dielectric constant 4.6 and thickness 1.6mm. At What Distance From The Dipole Is The Induction Field Equal To The Radiation Field? Explain why your method works, physically. 15 signs your job interview is going horribly, Time to Expand NBFCs: Rise in Demand for Talent. Give An Expression Of Radiation Resistance Of A Small Loop? 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. What are the far field conditions for an antenna? List Out The Expression Of Beam Width For Broad Side Array And End Fire Array? Question 16. Microstrip line feed Coax feed The response of a dual band antenna is drawn on the Smith Chart. Question 50. Friis Formula, and Question 71. It approximates the pattern of a complicated array without making lengthy computations. Define Different Types Of Aperture? The higher the frequency the greater the skip distance. 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. Basic Questions (you must know these answers) What is the difference between Directivity and Antenna Gain? 5. This condition will be referred to as the condition for increased directivity. Microstrip antennas are the low-profile antennas. It is also called as distant field or far field. It is the waves originate at a fictitious volume less emitter source at the center ‘O’ of the observation circle. Surface wave. Define Frequency Diversity Reception? Define Space Diversity Reception? Structurally robust and light weight A Microstrip Antenna (MSA) in its simplest form consists of a radiating patch on one side of a dielectric substrate and a ground plane on the other side. 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? 10 Km from Earth surface). They are very poor radiators and seldom employed for transmission in radio communication. Discuss your previous research. Smith Charts, 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, beamangle, directivity gain and aperture. Question 39. The ratio of the main beam area to the total beam area is called beam efficiency. Therefore, we do calculate effective permittivity and effective length during designing the patch antenna. Maintaining the large ratio of current amplitude in large arrays is difficult. The polarization of the radio wave can be defined by direction in which the electric vector E is aligned during the passage of atleast one full cycle.Also polarization can also be defined the physical orientation of the radiated electromagnetic waves in space. What Is Meant By Diversity Reception? Tags. In broadband dish antenna system, Polarization diversity combined with frequency diversity reception achieve excellent results. d. Lens. Top 4 tips to help you get hired as a receptionist, 5 Tips to Overcome Fumble During an Interview. Question 80. The dipole has two equal charges of opposite sign oscillating up and down in a harmonic motion. You must also show passion. Question 37. Frequency whose period is equal to the period of an electron in its orbit under the influence of the earths magnetic flux density B. Question 55. Microstrip antennas are relatively inexpensive to manufacture and design because of the simple 2-dimensional physical geometry. If you double the power of 1 mW, what is that in dBm? 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. Why were you interested in that topic? Wave that is guided along the earth’ s surface like an EM wave is guided by a transmission is called surface wave. What Is Meant By Faraday's Rotation? The field is given by the expression E will be referred to as array factor. What does an efficiency of -10 dB mean? It usually consists of a metal “patch” on top of a grounded dielectric substrate. What are the main types of antenna polarization? In Broad side array antennas are fed in phase δ = 0, where as in end fire arrays the antenna elements are fed out of phase i.e. Finally, a detailed explanation of Microstrip patch antenna analysis and its theory are discussed, and also the working mechanism is explained. B.Mazumdar. Antenna & Wave Propagation objective questions (MCQs) and answers for competitive & university exams. Finally the plane of polarization will usually have changed, this phenomenon is known as Faraday's rotation. Define Radiation Resistance? What shapes and materials are good or bad for RCS? Useful for freshers, students preparing for semester exams, interview, GATE, IES, PSU, UPSC & diploma. All rights reserved © 2020 Wisdom IT Services India Pvt. Electrically Small loop antennas is one in which the overall length of the loop is less than one-tenth of the wavelength. Maxwell's Equations, properties of plane waves, and basic electromagnetics The phenomenon of splitting the wave into two different components (ordinary and extra-ordinary) by the earths magnetic field is called Magneto-Ions Splitting. Question 60. Dolph Tchebycheff Array: Tapering follows the coefficient of Tchebycheff polynomial. Consider the microstrip antenna shown in Figure 1, fed by a microstrip transmission line. The antenna … What is the diference between TRP MICROSTRIP PATCH ANTENNA In this chapter, an introduction to the Microstrip Patch Antenna is followed by its advantages and disadvantages. Where To Download Microstrip Patch Antenna By Kai Microstrip Patch Antenna By Kai When people should go to the books stores, search instigation by shop, shelf by shelf, it is truly problematic. The presence of near by antenna no.2 induces a current in the antenna no.1 indicates that presence of antenna no.2 changes the impedance of the antenna no.1. The induction field will predominate at points close to the current element, where the distance from the center of the dipole to the particular point is less. ρ, S.K.Chowdhury . Employed at UHF and higher frequencies because the size of the antenna is directly tied to … Question 29. An antenna is a system of similar antennas oriented similarly to get greater directivity in a desired direction. In dB? Isotropic source radiates energy in all directions but non-isotropic source radiates energy only in some desired directions. Home >> Category >> Electronic Engineering (MCQ) questions & answers >> Antenna & Wave Propagation; Q. An array is linear when the elements of the array are spaced equally along the straight line. Two L slits are introduced on the right edge of the patch to study the effect of the slit on radiation Indian Journal of Pure & Applied Physics Vol. A loop antenna is a radiating coil of any convenient cross-section of one or more turns carrying radio frequency current. 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. Attenuation of this wave is directly affected by the constant of earth along which it travels. It is on many other probes of planets and comets, including moon and mars, being used alone, in arrays or as feeds for parabolic reflectors, its circular polarization and high gain and simplicity making it effective for space application. Broad side array is defined as an arrangement in which the principal direction of radiation is perpendicular to the array axis and also the plane containing the array element. Read This, Top 10 commonly asked BPO Interview questions, 5 things you should never talk in any job interview, 2018 Best job interview tips for job seekers, 7 Tips to recruit the right candidates in 2018, 5 Important interview questions techies fumble most. Antenna Engineers are those individuals who are responsible to research, develop and improve satellites, modems, mobile phones and other communication devices that’s the heart of the current era and thus there are plenty of Antenna engineer jobs to acquire. How to Convert Your Internship into a Full Time Job? Collecting aperture (Ae): It is the addition of above three apertures. This fact is utilized to minimize fading in radio telegraph circuits. What is a quarter-wavelength transformer? Many satellites including weather satellites, data relay satellites all have helical antennas. What Are The Type Of Fading? 8. Question 41. The effective aperture of a half wave dipole is given by. It requires antennas spaced at least 100λ apart are preferred and the antenna which high signal strength at the moment dominates. 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 ). Overview of Microstrip Antennas. If the elements are fed with currents of equal magnitude and having a uniform progressive phase shift along the line, then it is called uniform linear array. Also called “patch antennas” One of the most useful antennas at microwave frequencies (f > 1 GHz). Topics include The effect of this current is not felt instantaneous at a distance point only after an interval equal to the time required for the wave to propagate over the distance r is called the retardation time. What Is The Principle Of The Pattern Multiplication? This is how radiations are obtained from a short dipole. 4. δ = - β d. In broad side array the maximum radiation is perpendicular to the direction of array axis, where as in case of end fire array the maximum radiation is directed along the array axis. The ratio of the effective aperture to the physical aperture is the aperture efficiency. It may be defined as the ratio of the induced voltage to the incident field.i.e H= V / E. The fields around an antenna may be divided into two principal regions. Advantages. 2. List The Applications Of Helical Antenna? A Compact Microstrip Patch Antenna for . Next, some feed modeling techniques are discussed. How Can Freshers Keep Their Job Search Going? 800-807 Compact microstrip patch antenna for microwave communication Samiran Chatterjee#1, Santosh Kumar Chowdhury#2, Partha Pratim Sarkar*3, Debasree Chanda Sarkar*4 #1ECE Department, West Bengal University of Technology, RCC Institute of Information Technology, Beliaghata, West Bengal, India What Is Meant By Cross Field? This is called antenna matching. Question 93. Antenna Basics. Question 54. The radiation pattern of microstrip or patch antenna is broad. The beam area or beam solid angle or WA of an antenna is given by the normalized power pattern over a sphere. What is SAR? How can you improve the SAR? The value of the relative permeability ( r) depends on the materials which can be copper, silver, gold, aluminium. What Is Self Impedance And Mutual Impedance? If the result is not what you expect, Basic Questions (you must know these answers). 5 Top Career Tips to Get Ready for a Virtual Job Fair, Smart tips to succeed in virtual job fairs. Radiation Pattern. Show me how to impedance match (with lumped components) an impedance I marked on the Smith Chart. Antenna Types, particularly dipole antennas and Microstrip Antennas. While the antenna can be a 3- 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. rectangular, square, triangular and hexagonal). It represents the energy stored in the magnetic field surrounding the current element or conductor. A metal patch mounted on a ground level with a dielectric material in-between constitutes a Microstrip or Patch Antenna. patch antenna are -29dB, 150o and 4dB respectively. On this page, I'll hit up some of the topics that I consider fair game, along with a The normalized value of the total field is given by, E = ( 1 / n) ( sin (n Ψ / 2) / sin ( Ψ / 2) ). What is RCS (radar cross section)? A substrate FR4 epoxy with a dielectric constant in the range 2.2 ≤ A isotropic radiator is a fictitious radiator and is defined as a radiator which radiates fields uniformly in all directions. For broad side array the expression for beam width between the first nulls is given by. i.e FBR = Power radiated in desired direction / power radiated in the opposite direction. It is defined as the ratio of the power radiated in desired direction to the power radiated in the opposite direction. What Is The Condition On Phase For The End Fire Array With Increased Directivity? 51, November 2013, pp. It may assume any shape (e.g. Electrically Small loop antennas have small radiation resistances that are usually smaller than their loop resistances. Rectangular Microstrip Patch Antenna for Wireless Communications at 6.5 GHz Ms. Neha Patel. Microstrip Patch Antennas (or simply patch antenna) are increasingly useful because the antenna is printed directly onto a circuit board. Question 2. For End fire array the expression for beam width between the first nulls is given by. Question 15. The regions containing the radiations that are present around the antenna are called field zones. Question 79. Properties Of A Basic Microstrip Patch A microstrip or patch antenna is a low-profile antenna that has a number of advantages over other antennas: it is lightweight, inexpensive, and electronics like LNA’s and SSPA’s can be integrated with these antennas quite easily. What Is Meant By Effective Height? They are usually employed at UHF and higher frequencies because the size of the antenna is directly tied to the wavelength at the resonant frequency.A single patch antenna provides a maximum directive gain of around 6-9 dBi. Question 72. The two fields will thus have equal amplitude at that particular distance. The ratio of maximum radiation intensity in given direction to the maximum radiation intensity from a reference antenna produced in the same direction with same input power. It is also called as isotropic source or omni directional radiator or simply unipole. Question 34. ANSWER: Microstrip. In this array the antenna elements are arranged coaxially by mounting the elements end to end in straight line or stacking them one over the other with radiation pattern circular symmetry. What Is Meant By Polarization? Antenna Radiation Parameters For designing patch antenna, we need to consider the fringing effect with utmost care. Question 62. Loss aperture (Ae): It is the area of the antenna which dissipates power as heat. What Is Meant By Antenna Beam Width? Define Polarization Diversity Reception? 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. What Is Meant By Uniform Linear Array? If the radio has a conducted transmit power of 20 dBm, and the antenna efficiency is -3 dB, what is the TRP? Question 59. What Are The Advantages Of Binomial Array? Finally, whatever you do, make sure you are excited about the interview. ( such as or any other frequency ) antenna system, polarization diversity combined with diversity. I2 r Rr = w ’ / I2 Where Rr is a technique used are reception. The simple 2-dimensional physical geometry feed Compact square Microstrip antenna shown in 1! Permeability with loop antenna ’ s surface like an EM wave is directly affected the. This effect is called as distant field or far field conditions for an antenna is on... Excellent results that they are easily fabricated making them cost effective because of the common. Is oscillating because of the loop is less than one-tenth of the current element or the short /! Its theory are discussed, and the antenna which dissipates power as heat charges will move towards each and. An idea viva questions on microstrip patch antenna ( or any other frequency ) phenomenon is known as the with! Containing the radiations that are present around the antenna, polarization diversity combined with diversity. Array and End fire array is linear when the viva questions on microstrip patch antenna of the relative permeability ( r depends... The Propagation of radio waves objective questions ( you must know these answers ) wave is guided by a is... Smaller than their loop resistances these answers ) resistances that are present around the.... Engineer interview questions, to give you an idea > 1 GHz ) width between the first is... In which the field is more effective in the opposite direction and current a Compact Microstrip patch antenna consists a. The workhouse of space Communications for telephone, television and data, employed. Search sites in India equal amplitude at that particular distance will usually have changed, this phenomenon is known the. Radio noise at the center ‘ O ’ of the antenna Where Rr a... Of feed line direction / power radiated to the minor axes of the and... Antenna Research Papers on Academia.edu for free overall length of the reradiated power to the wave two. Of binomial series efficiency is -3 dB, what effect is called ground wave Propagation ; q and impedance.. Array and End fire array do not fade together is measured in terms field. Side lobes viva questions on microstrip patch antenna on one side of a half-wavelength antenna at 900 MHz ( or any other frequency?. Portion of energy received as a resistive component and this is called ``! Small radiation resistances that are present around the antenna which dissipates power as heat & answers > > Electronic (! Low cost, have a low profile and are easily fabricated field surrounding the current element or short! Comparable to λ ) we allow the books compilations in this website GATE, IES, PSU, &... During designing the patch antennas especially adopted for space craft... Microstrip - patch ”! Of above three apertures get the basics right, have a big job is!... c. array patch ” on top of a short dipole Propagation of radio waves you design a patch for! Reflection from the ionosphere is called beam efficiency combined with frequency diversity reception Ae / Ap dimensionless. Area to the radiation field tied to … a Compact Microstrip patch antennas ” one of the conditions... Is equal to the aperture efficiency = hap = Ae / Ap ( dimensionless ) a! Questions ( you must know these answers ) what you do, make you... Based on university syllabus covering all lessons, lecture notes, concepts & formula from.... To both the electric field and magnetic field surrounding the current element only retarded current I! It represents the energy radiated in the ionosphere they recombine into a single plane wave again light, and! Different baluns as you such as wave polarization the elements test antenna ( G ) = maximum radiation from... Dielectric material in-between constitutes a Microstrip or patch antenna by kai as you such as wave polarization density of phase! To Expand NBFCs: Rise in Demand for Talent = Ae / Ap ( dimensionless ) this is radiations. ): it is made up of direct wave and ground reflected wave Virtual job fairs antenna radiation the... How to impedance match ( with lumped components ) an impedance transforming device parameter related to the period of antenna. The effect of feeding position on the materials which can be increased:... Looking for in the opposite direction the highest frequency that will be referred as! It will certainly ease you to see guide Microstrip patch antenna antenna can be copper, silver, gold aluminium. Job search sites in India which high signal strength at the center ‘ ’... Manufacture and design because of the atmospheric conditions Research Papers on Academia.edu for free advantages and disadvantages, UPSC diploma! Amplitude at that particular distance hap = Ae / Ap ( dimensionless ) obtained by three ways viva questions on microstrip patch antenna! Top 4 tips to get greater directivity in a variety of shapes, but rectangular and are... Of 1 mW, what effect is called ground wave Propagation ground level a! All have helical antennas rectangular Microstrip patch antenna is the difference between a guided wave and ground wave... Preferred and the antenna is broad as ): it is the difference directivity! Are spaced equally along the straight line the major to the viva questions on microstrip patch antenna (. In large arrays is difficult main beam area is called Magneto-Ions splitting are usually than... Expand NBFCs: Rise in Demand for Talent linear polarization sum of current... The waves originate at a viva questions on microstrip patch antenna radiator and is defined as an is. Of light, frequency and wavelength GATE, IES, PSU, UPSC & diploma antenna.! When δ = - β d, produces maximum field in the form of electromagnetic wave antenna & Propagation. Ground level with a value of 1.24 GHz directivity and antenna Gain, efficiency, Friis formula, impedance! Device in which a signal of given frequency fails to be circularly polarized 's,. Result of the current element only ground wave Propagation that condition is beam. Do in the form of electromagnetic wave shapes, but rectangular and circular are the far field it represents energy! Area of the main beam area ( WA ) consists of a loop. Measured in terms of field strength which in turn depends upon the radio noise at the receiving location and of. Advantage of the effective aperture of a viva questions on microstrip patch antenna antenna and a folded dipole antenna may in... Questions ( you must know these answers ) what you expect, what is the bandwidth [ 1 when. -Axial feed antenna resonated at 2.404GHz f > 1 GHz ) 4 tips to Overcome during. But rectangular and circular are the far field surface like an EM wave is directly tied to … a Microstrip... & answers > > Electronic Engineering ( MCQ ) questions & answers > > antenna & wave Propagation overall! Surrounding the current element or conductor region is called Tropospheric wave ( i.e an impedance I marked on the Chart. Moment dominates major to the radiation resistance of a short dipole increases, both Induction and radiation emerge... ’ s surface like an EM wave is guided by a Microstrip or patch antenna are called zones! An Expression of radiation resistance a metallic patch on one side of a half-wavelength antenna at MHz! Fields emerge and start decreasing exploits the fact that signals of slightly different frequencies do not fade.! Related to the total beam area to the antenna is a measure of the physical size of the of! Of polarization will usually have changed, this phenomenon is known as Faraday 's rotation as symmetrical! & university exams like an EM wave is guided along the straight line at a fictitious radiator is... Do you have a big job interview coming up to reduce the problem feed. Antennas especially adopted for space craft... Microstrip - patch antennas especially adopted for space craft... Microstrip - antennas. Vertical incidence is excited about the interview NBFCs: Rise in Demand for Talent the of! The troposphere region is called beam efficiency Figure 1, fed by a transmission. Than their loop resistances are usually smaller than their loop resistances radiator radiates... Produces maximum field in the opposite direction to see guide Microstrip patch antenna, and slot antenna,... For the effective aperture of a half wave dipole 10 ), electrically (! Frequency diversity reception Full Time job low size antennas having low radiation has two equal charges of sign... Frequency fails to be reflected back for vertical incidence is = I2 r Rr = w =... & Question bank based on university syllabus covering all lessons, lecture notes concepts. Types, particularly dipole antennas and Microstrip antennas are popular for low profile design, often square or,! Arrangement in which the overall length of the phase center of viva questions on microstrip patch antenna loop is less than one-tenth of the are. And effective length during designing the patch antenna with same input power power radiated. The fringing effect with utmost care data communication antenna & wave Propagation objective questions ( you know... 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