Introduction to Types of Antenna
DIPOLE ANTENNA:
This kind of outdoor antenna is made up of two pieces of aluminium poles. Therefore this kind of antenna is termed Dipole antenna. Suppose the length of this type of dipole antenna is 7.4feet. This antenna is able of attracting the signals related to it. However in the middle portion, current and voltage are high. Therefore, the transmission cable which is connected in this portion and taken to the TV receiver. The gain achieved by this antenna is very minimum, therefore it is modified.
FOLDER DI-POLE ANTENNA:
In this, a pole that is double the length of the di-pole is occupied and folded making equal to the length of di-pole. Because this structure is double such as the di-pole antenna, it is able of absorbing more signals. The gain achieved by this antenna is double like of the di-pole antenna. Therefore this kind of antenna is employed through the people bit far away from the transmitter.
REFLECTOR DI-POLE ANTENNA:
This category of antenna is employed at the distance of more than 50km from the transmitter. In this, together with the folded di-pole, an yet other pole that has bit more length than the di-pole is placed. This is termed as Reflector, because it imitates the waves to the di-pole and forms magnetic flux in it. The distance among the di-pole and the reflector is ë/4. Because, the phase of this wave and the wave attracted through the di-pole are identical. Therefore this kind of antenna is able of providing more gain.
YAGI ANTENNA:
The diagram depicts the structure of yagi antenna. As similar to reflector and yet other piece of pole is added before the di-pole. The length of the new piece have be equivalent to the di-pole. This is known as director.
In the diagram 'D' stands for director. Suppose that waves are coming from the arrow's direction, the director is the first (primary) element to receive the waves. At present this antenna could capable to produce three times higher gain (reflector, director, folded di-pole) than the strength of another antenna. Therefore the gain provided through this antenna is extremely high and it is extensively used even far away from the transmitter.
Figure: yagi antenna
DISH ANTENNA:
The word dish antenna is frequently employed for a parabolic antenna. Parabolic antenna is a high-gain reflector antenna that employed for television and data communications, radio, and as well for radiolocation (radar), on the SHF and USF parts of the electromagnetic spectrum. At these frequencies the comparatively short wavelength of electromagnetic radiation permits reasonably sized reflectors to show the wanted highly directional response for both transmitting and receiving.
Heinrich Hertz built the first parabolic reflector antenna of world in year 1888. The antenna contain a focal distance of 0.12meters, an aperture 1.2 meters wide, and was employed at operating frequency of approximately 450MHz. the reflector was prepared from zinc sheet metal that supported through a wooden frame, and contain a spark-gap excited dipole along the focal line. Along with, two such types of antennas one employed for transmitting and another for receiving.
A general parabolic antenna contains a parabolic reflector along with a small feed antenna at its focus. To locate the focus, reflect the light of a flashlight off of the dish. The flashlight is at the focus, while the reflected beam is parallel.
The reflector is a metallic surface created into a parabolic of revolution and in a rounded rim which creates the diameter of the antenna. This paraboloid possesses a different focal point by virtue of containing the reflective property.
The feed antenna at the focus of reflector is generally a low gain like a half-wave dipole or a small waveguide horn. The feed antenna is linked to the related radio frequency (RF) transmitting or receiving equipment through way of a coaxial cable transmission line or hollow waveguide.
Referring the parabolic antenna like a circular aperture provides the subsequent approximation for the maximum gain: G ≈ (π2 D2) / λ2 or G() \
Where:
G stands for power gain,
D stands for reflector,
ë stands for wavelength
Latest technology based Electrical Engineering Online Tutoring Assistance
Tutors, at the www.tutorsglobe.com, take pledge to provide full satisfaction and assurance in Types of Antenna homework help via online tutoring. Students are getting 100% satisfaction by online tutors across the globe. Here you can get homework help for Types of Antenna, project ideas and tutorials. We provide email based Types of Antenna homework help. You can join us to ask queries 24x7 with live, experienced and qualified online tutors specialized in Types of Antenna. Through Online Tutoring, you would be able to complete your homework or assignments at your home. Tutors at the TutorsGlobe are committed to provide the best quality online tutoring assistance for Electrical Engineering homework help and assignment help services. They use their experience, as they have solved thousands of the Electrical Engineering assignments, which may help you to solve your complex issues of Types of Antenna. TutorsGlobe assure for the best quality compliance to your homework. Compromise with quality is not in our dictionary. If we feel that we are not able to provide the homework help as per the deadline or given instruction by the student, we refund the money of the student without any delay.
Industrial Chemical Processes I tutorial all along with the key concepts of Definition of chemical industry, Basic chemicals, Speciality chemicals, Consumer chemicals, Where are chemical sites located, Chemical industry: how environmentally safe, challenges for the chemical industry
Theory and lecture notes of Stock Market all along with the key concepts of the stock market, Six Key Indicators of Macroeconomics and level of stock market. Tutorsglobe offers homework help, assignment help and tutor’s assistance on Stock Market.
purification methods-empirical and molecular formula tutorial all along with the key concepts of purification methods, distillation, crystallization, chromatography, empirical and molecular formula, structural formula
www.tutorsglobe.com offers rectilinear figures homework help, rectilinear figures assignment help, online tutoring assistance, geometry mathematics solutions by online qualified math tutor's help.
Move ahead with first-class Project Management Assignment Help service to score top grades at competitive prices!
tutorsglobe.com selling costs assignment help-homework help by online characteristics of monopolistic competition tutors
tutorsglobe.com laboratory diagnosis assignment help-homework help by online candida albicans tutors
www.tutorsglobe.com offers d-block elements & its properties homework help, d-block assignment help, online tutoring assistance, inorganic chemistry solutions by online qualified tutor's help.
The Main Features of Limited Companies are Legal nature (A limited company has been explained as an artificial person that has been produced by law.), Perpetual life, Limited liability.
There is a danger that non-executive directors will not provide an independent voice. They may come under the influence of the executive directors and fail to challenge decisions and so promote proper accountability.
Principles of Nuclear Magnetic Spectroscopy tutorial all along with the key concepts of NMR Spectroscopy, Principles of Nuclear Magnetic Resonance Spectroscopy, Chemical Shift and NMR Spectrometers
Insulating materials are exists in dissimilar shapes and sizes. Insulating materials are presented like Tapes, rolls, sleeves, paper and cloth.
It might be useful to make clear the role and composition of the board of directors. The board governs the company for the shareholders and is accountable for promoting their interests.
theory and lecture notes of amplifier configurations and instrumentation amplifier along with the key concepts of inverting amplifier, difference amplifier, instrumentation amplifier. tutorsglobe offers homework help, assignment help and tutor’s assistance on amplifier configurations.
Comparative Morphology in Plant tutorial all along with the key concepts of Algae Morphology, Unicellular forms, Colonial Algae, Filamentous Forms, Heterotrichous Form, Thalloid Forms and Polysiphonoid Forms
1943672
Questions Asked
3689
Tutors
1462799
Questions Answered
Start Excelling in your courses, Ask an Expert and get answers for your homework and assignments!!