This document discusses key concepts related to antennas including:
1. It defines radiation power density as the power radiated per unit surface area from the antenna surface.
2. It explains that directivity is a measure of the directional properties of an antenna and is defined as the ratio of radiation intensity in a given direction compared to an isotropic source.
3. Gain accounts for both the directional properties and efficiency of an antenna, defined as the ratio of intensity in a given direction compared to an isotropic source radiating the same total power.
4. Additional concepts covered include beamwidth, radiation patterns, and parameters related to receiving performance such as effective length and capture area.
By completing this presentation will be have a clear idea about Antenna's working principles, Antenna's Types & Antenna's Parameters. At the end to this document you'll have a brief idea about Antenna's Tilt vs Distance Calculation & Cluster wise optimum Antenna Selection procedure. Impact of antenna PIM & VSWR have been described elaborately in this document as well.
An Antenna is a transducer, which converts electrical power into electromagnetic waves and vice versa.
An Antenna can be used either as a transmitting antenna or a receiving antenna.
A transmitting antenna is one, which converts electrical signals into electromagnetic waves and radiates them.
A receiving antenna is one, which converts electromagnetic waves from the received beam into electrical signals.
In two-way communication, the same antenna can be used for both transmission and reception.
Basic Parameters
Frequency
Wavelength
Impedance matching
VSWR & reflected power
Bandwidth
Percentage bandwidth
Radiation intensity.
hello readers i give my PPT presentation for about antenna and ther properties and working explain in this ppt
i hope you like it THANK YOU.......!!!!!!!
An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. The individual antenna elements are connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase relationship. The radio waves radiated by each individual antenna combine and superpose, adding together (interfering constructively) to enhance the power radiated in desired directions, and cancelling (interfering destructively) to reduce the power radiated in other directions. Similarly, when used for receiving, the separate radio frequency currents from the individual antennas combine in the receiver with the correct phase relationship to enhance signals received from the desired directions and cancel signals from undesired directions.
By completing this presentation will be have a clear idea about Antenna's working principles, Antenna's Types & Antenna's Parameters. At the end to this document you'll have a brief idea about Antenna's Tilt vs Distance Calculation & Cluster wise optimum Antenna Selection procedure. Impact of antenna PIM & VSWR have been described elaborately in this document as well.
An Antenna is a transducer, which converts electrical power into electromagnetic waves and vice versa.
An Antenna can be used either as a transmitting antenna or a receiving antenna.
A transmitting antenna is one, which converts electrical signals into electromagnetic waves and radiates them.
A receiving antenna is one, which converts electromagnetic waves from the received beam into electrical signals.
In two-way communication, the same antenna can be used for both transmission and reception.
Basic Parameters
Frequency
Wavelength
Impedance matching
VSWR & reflected power
Bandwidth
Percentage bandwidth
Radiation intensity.
hello readers i give my PPT presentation for about antenna and ther properties and working explain in this ppt
i hope you like it THANK YOU.......!!!!!!!
An antenna array (or array antenna) is a set of multiple connected antennas which work together as a single antenna, to transmit or receive radio waves. The individual antenna elements are connected to a single receiver or transmitter by feedlines that feed the power to the elements in a specific phase relationship. The radio waves radiated by each individual antenna combine and superpose, adding together (interfering constructively) to enhance the power radiated in desired directions, and cancelling (interfering destructively) to reduce the power radiated in other directions. Similarly, when used for receiving, the separate radio frequency currents from the individual antennas combine in the receiver with the correct phase relationship to enhance signals received from the desired directions and cancel signals from undesired directions.
Broadside Array vs end-fire array
Higher directivity.
Provide increased directivity in
elevation and azimuth planes.
Generally used for reception.
Impedance match difficulty in
high power transmissions.
Variants are:
Horizontal Array of Dipoles
RCA Fishborne Antenna
Series Phase Array
Frequency Independent Antennas:
Wide band antennas
Frequency independent bandwidth in octave range
Broadband antennas
Frequency independent bandwidth in the range 40:1
Multiband antennas
Antenna resonate at different frequencies.
Broadside Array vs end-fire array
Higher directivity.
Provide increased directivity in
elevation and azimuth planes.
Generally used for reception.
Impedance match difficulty in
high power transmissions.
Variants are:
Horizontal Array of Dipoles
RCA Fishborne Antenna
Series Phase Array
Frequency Independent Antennas:
Wide band antennas
Frequency independent bandwidth in octave range
Broadband antennas
Frequency independent bandwidth in the range 40:1
Multiband antennas
Antenna resonate at different frequencies.
Its a good presentation on Antenna topic because every one is know that in electrical engineering antenna is a complete subject & its too much difficult subject of electrical engineering....I hope this ppt slides helpful in your future...Thanks A lot guys.......
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MicroStrip Antenna
Introduction .
Micro-Strip Antennas Types .
Micro-Strip Antennas Shapes .
Types of Substrates (Dielectric Media) .
Comparison of various types of flat profile printed antennas .
Advantages & DisAdvantages of MSAs .
Applications of MSAs .
Radiation patterns of MSAs .
How to Optimizing the Substrate Properties for Increased Bandwidth ?
Comparing the different feed techniques .
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This three-day course teaches the basics of antenna and antenna array theory. Fundamental concepts such as beam patterns, radiation resistance, polarization, gain/directivity, aperture size, reciprocity, and matching techniques are presented. Different types of antennas such as dipole, loop, patch, horn, dish, and helical antennas are discussed and compared and contrasted from a performance - applications standpoint. The locations of the reactive near-field, radiating near-field (Fresnel region), and far-field (Fraunhofer region) are described and the Friis transmission formula is presented with worked examples. Propagation effects are presented. Antenna arrays are discussed, and array factors for different types of distributions (e.g., uniform, binomial, and Tschebyscheff arrays) are analyzed giving insight to sidelobe levels, null locations, and beam broadening (as the array scans from broadside.) The end-fire condition is discussed. Beam steering is described using phase shifters and true-time delay devices. Problems such as grating lobes, beam squint, quantization errors, and scan blindness are presented. Antenna systems (transmit/receive) with active amplifiers are introduced. Finally, measurement techniques commonly used in anechoic chambers are outlined. The textbook, Antenna Theory, Analysis & Design, is included as well as a comprehensive set of course notes.
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HFSS MICROSTRIP PATCH ANTENNA- ANALYSIS AND DESIGNShivashu Awasthi
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In radio and electronics, an antenna is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver. In transmission, a radio transmitter supplies an electric current oscillating at radio frequency to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves (radio waves). In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce a tiny voltage at its terminals, that is applied to a receiver to be amplified.
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The Division of Vaccine and Immunization is facing increasing difficulty monitoring vaccines and other commodities distribution once they have been distributed from the national stores. With the introduction of new vaccines, more challenges have been anticipated with this additions posing serious threat to the already over strained vaccine supply chain system in Kenya.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
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Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
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Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
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21. infinite distances are not realizable in practice, the most commonly used criterion
for minimum distance of far-field observations is 2D2/λ.
22. One radian is defined as the plane angle with its vertex at the center of a circle of
radius r that is subtended by an arc whose length is r.
23. One steradian is defined as the solid angle with its vertex at the center of a sphere of
radius r that is subtended by a spherical surface area equal to that of a square with
each side of length r.
24. Radiation Power Density
The power radiated per unit surface area from the antenna surface (in spherical
coordinates system) is called Radiation Power Density (in W/m2).
Instantaneous
Poynting vector
25. The poynting vector can also be expressed as:
Average poynting
vector or Average
power density
Real (calculated
over one time
period):
Imaginary part is
eliminated
Radiation Power Density
Peak Values (not
RMS)
Analogous to Ohm’s law :
P=1/2 VI*
26. Instanatious Total Power = Integration of normal component of poynting
vector (power density) over the entire surface
Average (total) radiated power
28. Radiation intensity (W/unit solid angle) in a given direction is defined as “the
power radiated from an antenna per unit solid angle.” Obtained by multiplying
radiation density (in W/m2) with square of distance r.
29.
30. Radiation is equal in all directions, i.e. U will be independent of the angles θ and φ,
31. The beamwidth of a pattern is defined as the angular separation between two
identical points on opposite side of the pattern maximum.
Half-Power Beamwidth (HPBW ) is defined as: “In a plane containing the direction
of the maximum of a beam, the angle between the two directions in which the
radiation intensity is one-half value of the beam.”
The angular separation between the first nulls of the pattern is referred to as the
First-Null Beamwidth (FNBW )
32.
33. Directivity, D
•directivity of an antenna defined as “the ratio of the radiation intensity in a given
direction from the antenna to the radiation intensity averaged over all directions.
•The average radiation intensity is equal to the total power radiated by the antenna
divided by 4π.
•If the direction is not specified, the direction of maximum radiation intensity is
implied.”
34. directivity of a nonisotropic source is equal to the ratio of its radiation intensity
in a given direction over that of an isotropic source.
52. The values of directivity will be equal to or greater than zero and equal to or less
than the maximum directivity (0 ≤ D ≤ D0).
53. Normalised Radiation
intensity
The beam solid angle ΩA is defined as the solid angle through which all the
power of the antenna would flow if its radiation intensity is constant (and equal to
the maximum value of U, i.e. Umax) for all angles within ΩA.
54. Instead of using the exact expression of (2-23) to compute the directivity, it is often
convenient to derive simpler expressions, even if they are approximate, to compute
the directivity. These can also be used for design purposes.
For antennas with one narrow major lobe and very negligible minor lobes, the beam
solid angle is approximately equal to the product of the half-power beamwidths in two
perpendicular planes
Symmetrical and
85. The total antenna efficiency e0 is used to take into account losses at
the input terminals and within the structure of the antenna.
1. reflections because of the mismatch between the transmission line and the antenna
2. I 2R losses (conduction and dielectric)
86.
87.
88.
89.
90.
91. Gain
•Gain of an antenna (in a given direction) is defined as “the ratio of the intensity, in a
given direction, to the radiation intensity that would be obtained if the power accepted
by the antenna were radiated isotropically.
•The radiation intensity corresponding to the isotropically radiated power is equal to
the power accepted (input) by the antenna
divided by 4π.”
•gain of the antenna is closely related to the directivity, it is a measure that takes into
account the efficiency of the antenna as well as its directional capabilities.
•directivity is a measure that describes only the directional properties of the antenna,
and it is therefore controlled only by the pattern.
92.
93.
94.
95.
96.
97. Relative Gain
•the ratio of the power gain in a given direction to the power gain of a reference
antenna (a lossless isotropic source).” The power input must be the same for both
antennas.
Partial Gains
143. Definition: the ratio of the available power at the terminals of a receiving antenna
to the power flux density of a plane wave incident on the antenna from that
direction, the wave being polarization-matched to the antenna.
147. RT (load) Rr RL
Finally the capture area is defined as the equivalent area, which when multiplied by the incident
power density leads to the total power captured, collected, or intercepted by the antenna.