 =
o
" |
is conductivity in siemens/meter |
|
o = 8.85 x 10-12 F/m: permittivitiy of free space |
| " is the imaginary part of complex relative permittivity |
| |
= 2 f |
is radian frequency in radians/second |
| f is frequency in hertz |
| |
tan  = "/' | tan is the loss tangent |
| |
| P = | E |2 |
P is density of absorbed power at a point in watts/cubic meter |
| is conductivity in siemens/meter at the point |
| |E | is rms electric-field intensity in rms volts/meter |
| |
| D = E | D is electric-flux density in coulombs/square meter |
| is permittivity in farads/meter |
| E is electric-field intensity in volts/meter |
| |
B =  H | B is magnetic-flux density in tesla |
| is permeability in henry/meter |
| H is magnetic-field intensity in amperes/meter |
| |
| o=8.85 x 10-12 F/m | o is the permittivity of free space |
| |
| o = 4 x 10-7 H/m | o is the permeability of free space |
| |
| f = 1/T | f is frequency in hertz |
| |
| T is period in seconds |
| |
 = v/f | is wavelength in meters |
| |
| v is velocity of propagation in meters/second |
| f is frequency in hertz |
| |
 | E/H is the wave impedance in ohms |
| E/H = 377 ohms in free space | E is the magnitude of the electric-field intensity in volts/meter |
| H is the magnitude of the magnetic-field intensity in amperes/meter |
| |
| |
 | v is the velocity of propagation in meters/second |
| v = 3 x 108 m/s in free space | is the premeability in henry/meter |
| is the permittivity in farad/meter |
| |
| <P> = <E x H> | <P> is the time-averaged Poynting's vector in watts/square meter |
| E is the electric-field intensity in rms volts/meter |
| H is the magnetic-field intensity in rms amperes/meter |
| |
| P = E2/377 | P is the magnitude of the time-average Poynting vector for a planewave in free space |
| E is the magnitude of the electric-field intensity in rms volts/meter |
| 377 is the wave impedance of free space in ohms |
| |
| S = Emax/Emin | S is the standing-wave ratio (unitless) |
| E max is the maximum value of the magnitude of the electric-field intensity anywhere along the wave |
| E min is the minimum value of the magnitude of the electric-field intensity anywhere along the wave |
| |
S = (1 +  ) / (1 - ) | S is the standing-wave ratio (unitless) |
|
is the magnitude of the reflection coefficient (ratio of reflected E-field to incident E-field) |
 | |
| is the skin depth in meters |
| ' is the real part of the permittivity |
|
" is the imaginary part of the permittivity |
| f is the frequency in MHz |
| |
| SAR =
|E| 2 / m | SAR is the local specific absorption rate in watts/kilogram |
| is the conductivity in siemens/meter |
| |E| is the electric-field strength in rms volts/meter |
| m is the mass density in kilograms/cubic meter |
 | |
| fo is the resonant frequency in hertz of the SAR for E polarization |
|  is the average length of the absorbing object |
| d is the average diameter of the absorbing object |
 | F is the rms value of the periodic function f (t) |
| T is the period of the function |
| |
G = gp / | G is the rms value of a sinusoid |
| Gp is the peak value of the sinusoid |
| |
| d = 2L2/
| d is the approximate distance from an antenna at which the n ear fields become negligible and the fields are approximately far fields |
| L is the largest dimension of the antenna |
| is the wavelength |