Appendix D
Symbols
If a subject area is indicated, it will be in brackets (e.g., [RF]), whereas other comments, such as units for a quantity, will be in parentheses [e.g., 505 (usually, hertz)].
| A | amplitude (e.g., of a sinusoid) |
| Ac | carrier amplitude A(t): time-varying amplitude of modulated sinusoid |
| B | magnetic flux density (usually, Wb/m2 or tesla) |
| B | bandwidth (usually, hertz) |
| Bb | signal bandwidth at baseband |
| Bt | transmitted signal bandwidth |
| Bchannel | channel bandwidth (usually, hertz) |
| Btotal | total bandwidth (usually, hertz; e.g., available for use in a cellular system) |
| χe | electric susceptibility |
 |
the (infinite) set of complex numbers |
| C | capacitance (usually, farads) |
| C | (Shannon) capacity [information theory] |
| {cn} | set of Fourier series coefficients |
| D | electric displacement field |
| D | directivity [antennas] |
| D(θ, ϕ) | directive gain [antennas] |
| d | distance (e.g., between a transmitter and a receiver) |
| dboundary | boundary between far field and near field [antennas] |
| Δf | a small difference in frequency |
| δ(t) | impulse response [signals and systems] |
| E | electric field |
| Eant | antenna efficiency [antennas] |
| Eb/N0 | energy per bit to white noise power spectral density ratio |
| e | 2.71828182846 . . . (a constant) |
| ε | permittivity, or absolute permittivity (in contrast to r) |
| ε0 | permittivity of free space |
| εr | dielectric constant, or relative permittivity (in contrast to ... |
