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Antenna Parameters

The document discusses antenna parameters, including transducers, radiation patterns, and necessary conditions for effective radiation. It outlines types of radiation patterns such as isotropic, directional, and omni-directional, along with key concepts like E-plane and H-plane. Additionally, it emphasizes the importance of understanding field regions for antenna design and signal propagation.

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15 views24 pages

Antenna Parameters

The document discusses antenna parameters, including transducers, radiation patterns, and necessary conditions for effective radiation. It outlines types of radiation patterns such as isotropic, directional, and omni-directional, along with key concepts like E-plane and H-plane. Additionally, it emphasizes the importance of understanding field regions for antenna design and signal propagation.

Uploaded by

noyesyesgg
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Antenna Parameters

• Transducer – converts electric energy to EM energy


• Momentary radiation of DC
• Change in energy due to acceleration and deceleration of
charges causes radiation

• Necessary conditions
Radiation Pattern

1. Power density
2. Radiation Intensity
3. Directivity
4. Gain
5. Polarization
6. Field strength

1. Amplitude field pattern

2. Amplitude power pattern


Radiation Pattern Lobes
Types of patterns
• Isotropic- Radiates equally in all directions –point source

• Directional- Radiates or receives effectively in or from a particular


direction- yagi uda
Omni- directional - In one plane directional and in other plane isotropic -
Dipole antenna
Principle Planes
E- plane - Plane containing E field vector and
direction of wave propagation

H- plane - Plane containing H field vector and


direction of wave propagation
Uniform Plane Wave

E X H = direction of wave propagation – TEM wave


Understanding these regions is crucial for antenna design, placement, and

Field Regions analysis. The near field is often associated with reactive effects, while the far
field is where the antenna's radiation pattern becomes more predictable and
consistent. The Fresnel zone is important for assessing signal propagation and
potential obstacles in the communication path.
Radian There are 2π radians in a circle as C= 2πr

• Measure of a plane angle

Steradian - Measure of a solid angle

There are 4π steradians in a closed sphere as A= 4πr2


infinitesimal area on sphere
Radiation Power Density
For an isotropic radiator
• References
• C. A. Balanis, Antenna Theory: Analysis and Design (3rd eds.), John Wiley & Sons, Hoboken, NJ,
2005.

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