| D |
|
|
|
| dBm |
|
Relative measure of signal power where the reference 0 dBm
is equal to one milliwatt. See also decibel. |
|
| Decibel, dB |
|
A relative, dimensionless unit calculated as ten times the
logarithm to the base 10 of a power ratio or as twenty times
the logarithm to the base 10 of a voltage ratio. |
|
| Delay Line |
|
A cable that delays electrical signals by a specified amount
of time. |
|
Dielectric |
|
In a coaxial cable, the insulation between inner and outer conductor.
It significantly influences the electrical characteristics such
as impedance, capacitance, and velocity of
propagation. |
|
Dielectric Constant
(Permittivity) |
|
Basic electrical property of a material that describes its
behaviour in an electric field. The dielectric constant of the
dielectric is the most important design parameter for coxial
cables and determines dimensions, losses and propagation characteristics. |
|
Dielectric Withstanding
Voltage |
|
The maximum potential gradient that a dielectric material
can withstand without failure. |
|
| DIN 7/16 |
|
50 ‰ coxial connector with screw type coupling mechanism.
Suitable for medium to high power applications. Frequency range
DC - 7.5 ㎓. |
|
| Direct Current (DC) |
|
An electric current which flows in only one direction. |
|
| Dissipation |
|
Unusable or lost energy, such as the production of unused
heat in a circuit. |
|
| Distortion |
|
An unwanted change or addition to a signal or waveform when
it is amplified.
This definition excludes noise which is an extraneous signal
superimposed on the desired signal. |
|
