ANTENNA & PROPAGATION

Far Zone:

: Field Pattern

Instantenous Poynting Vector (Power Density):

Avarage Power Radiated:

Radiation Intensity: (independent from r)

unitsphere

Directivity:

Beam Solid Angle:

Approximate Formulas for Directivity:

Krauss: (rad) Thai Pereira: (degree)

Beam Efficiency: ( : power radiated in cone angle θ, first null angle)

Gain and Efficiency:

\_____/ \___/(efficiency)

\_________/overall efficiency:

voltage reflection coefficient:

Transmitter Receiver

Vector Effective Length:

∝ Field Pattern

output at open circuit receiver, input for

receiver

Effective Area (Aperture):

output power to load, incident power density

(input)

at max value:

\_____/free space

propagation loss

: Effective Isotropic Radiated Power (EIRP)

Because for

, ,

Infinitesimal Dipole:

,

,

Small Dipole:

\__________/

,

Finite Length Dipole:

,

Half Wavelength Dipole:

Loop Antenna:

,

Array:

isotropic sources:

Array Factor:

\______/

for ,