Important: Use custom search function to get better results from our thousands of pages

Use " " for compulsory search eg:"electronics seminar" , use -" " for filter something eg: "electronics seminar" -"/tag/" (used for exclude results from tag pages)

Thread Rating:
  • 0 Votes - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Fundamental Parameters of Antennas pdf
Post: #1

Fundamental Parameters of Antennas

.pdf  1Fundamental Parameters.pdf (Size: 1.58 MB / Downloads: 222)


To describe the performance of an antenna, definitions of various parameters are necessary.
Some of the parameters are interrelated and not all of them need be specified for
complete description of the antenna performance. Parameter definitions will be given
inthis chapter. Many of those inquotationmarks are from the IEEE Standard Definitions
of Terms for Antennas (IEEE Std 145-1983).∗ This is a revisionof the IEEE Std


An antenna radiation pattern or antenna pattern is defined as “a mathematical function
or a graphical representation of the radiation properties of the antenna as a function
of space coordinates. Inmost cases, the radiationpatternis determined in the farfield
region and is represented as a function of the directional coordinates. Radiation
properties include power flux density, radiation intensity, field strength, directivity,
phase or polarization.” The radiation property of most concern is the two- or threedimensional
spatial distribution of radiated energy as a function of the observer’s
position along a path or surface of constant radius. A convenient set of coordinates
is shown in Figure 2.1. A trace of the received electric (magnetic) field at a constant
radius is called the amplitude field pattern. Onthe other hand, a graph of the spatial
variation of the power density along a constant radius is called an amplitude power

Radiation Pattern Lobes

Various parts of a radiationpattern are referred to as lobes, which may be subclassified
into major or main, minor, side, an dback lobes.
A radiation lobe is a “portion of the radiation pattern bounded by regions of
relatively weak radiation intensity.” Figure 2.3(a) demonstrates a symmetrical threedimensional
polar pattern with a number of radiation lobes. Some are of greater
radiation intensity than others, but all are classified as lobes.

Principal Patterns

For a linearly polarized antenna, performance is often described in terms of its principal
E- an dH-plane patterns. The E-plane is defined as “the plane containing the electricfield
vector and the direction of maximum radiation,” and the H-plane as “the plane
containing the magnetic-field vector and the direction of maximum radiation.” Although
it is very difficult to illustrate the principal patterns without considering a specific
example, it is the usual practice to orient most antennas so that at least one of the
principal plane patterns coincide with one of the geometrical principal planes. An
illustrationis showninFigure 2.5. For this example, the x-z plane (elevation plane;
φ = 0) is the principal E-plane and the x-y plane (azimuthal plane; θ = π/2) is the
principal H-plane. Other coordinate orientations can be selected.

Radian and Steradian

The measure of a plane angle is a radian. 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. A graphical illustration is showninFigur e 2.10(a). Since the circumference of a
circle of radius r is C = 2πr, there are 2π rad (2πr/r) ina full circle.
The measure of a solid angle is a steradian. 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. A graphical illustration
is showninFigure 2.10(b). Since the area of a sphere of radius r is A = 4πr2, there
are 4π sr (4πr2/r2) ina closed sphere.

Marked Categories : fundamental parameters of antennas, fundamental parameters antenna ppt, fundamentals of antenna parameters pdf, fundamental parameters of antenna in pdf file, antenna parameters pdf, an tenna parameter field region calculation ppt, standard definitions of terms for antennas pdf 1983, seminar report on antenna fundamentals pdf, antenna parameters definition, fundamental parameters of antenna pdf, antenna seminar topics pdf, fundamental parameters antenna pdf, the parameters of antenna pdf, fundamental parameters of antennas pdf, electrical parameter pdf, antenna parameters, fundamental parameters of antenna ppt, fundamental parameters of antennas ppt,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  servlet jsp multiple choice questions and answers pdf Guest 3 2,866 18-01-2018 02:42 PM
Last Post: dhanabhagya
  siwes report on science laboratory technology pdf Guest 1 0 15-01-2018 01:58 PM
Last Post: dhanabhagya
Thumbs Up maths mvssn prasad ecet books in pdf Guest 0 0 14-01-2018 03:15 PM
Last Post: Guest
  siwes report on science laboratory technology pdf bello idirs wolf 1 0 12-01-2018 12:10 PM
Last Post: dhanabhagya
  sound pollution information in marathi language pdf file Guest 3 5,654 12-01-2018 12:09 PM
Last Post: dhanabhagya
  POLLUTION & TYPES OF POLLUTION pdf project girl 2 5,362 12-01-2018 10:28 AM
Last Post: dhanabhagya
  mechanic diesel theory pdf in hindi medium Guest 1 133 08-01-2018 02:38 PM
Last Post: dhanabhagya
  is earth turning into dumping ground evs project 12 science pdf file Guest 1 0 08-01-2018 12:50 PM
Last Post: dhanabhagya
  bmsic textbook pdf Guest 1 254 08-01-2018 12:13 PM
Last Post: dhanabhagya
  m1 textbook for engineering mathematics author s panduranga pdf Guest 1 0 08-01-2018 12:12 PM
Last Post: dhanabhagya
This Page May Contain What is Fundamental Parameters of Antennas pdf And Latest Information/News About Fundamental Parameters of Antennas pdf,If Not ...Use Search to get more info about Fundamental Parameters of Antennas pdf Or Ask Here