Solutions for
|
Home /
Shielding /
Key Terms - EFGH
| Electric Field | A field induced by a high impedance source, such as a monopole. A region where there is a voltage potential; the potential changing with distance. The strength of the field is expressed either in decibels, dB, with respect to a reference voltage or an absolute value expressed in volts per meter | | Electromagnetic Field | A wave characterized by variations of electric and magnetic fields | | Electromotive Force | Pressure of voltage. The force which causes current to flow in a circuit | | EMP | Electromagnetic Pulse; a large impulsive-type electromagnetic wave generated by nuclear or chemical explosions | | Farad | The unit of capacitance | | Faraday Shield | A conductor (copper, steel, etc.) put in place to electrically shield or contain RF energy. Shielded enclosures are sometimes referred to as "Farady Cages." | | Far Field/Radiation Field | A distance greater than the wavelength divided by 2π where the transition of the electric and magnetic field impedance reaches 377 ohms | | Fault | An unintentional short circuit or partial short (usually of a power circuit) between energized conductors or between an energized conductor to ground | | Feedthru | A conductor through the thickness of a substrate, thus electrically connecting both surfaces | | | A path used to bring in or out desired signals through a shielded enclosure | | Filter | A selective network which will allow the desired frequencies to pass while suppressing or attenuating other frequencies | | Flanking Paths | Transmission paths which transmit acoustic energy around a sound barrier; paths which "bypass" the intended barrier | | Free Field | An environment in which there are no reflective surfaces within the frequency range of interest | | Frequency | The number of cyclical variations per unit time. Frequency is generally expressed in cycles per second (cps), also denoted Hertz (Hz) | | | The unit of frequency measurement is Hertz, which stands for cycles per second | | Frequency Band | A range of frequencies that can be covered without switching | | Frequency Span | The magnitude of the frequency band displayed, expressed in Hertz or Hertz per division |
| Gasket | A material that is inserted between mating surfaces of an electronic enclosure to provide low resistance across the seam and thereby preserve current continuity of the enclosure | | Gauss | A unit of magnetic induction (flux density) equal to 1 maxwell per cm squared | | Gigahertz | A unit of frequency equal to 1 billion Hertz | | Ground | A reference plane common to all electronic, electrical, electro-mechanical systems and connected to earth by means of a ground rod, ground grid, or other similar means | | Ground Isolation | Maintaining an insulating dielectric layer between a shielded enclosure and ground | | Harmonic | A sinusoidal wave having a frequency that is an integral multiple of the fundamental frequency. | | HEMP | High-Altitude Electromagnetic Pulse; relates to MIL-Hdbk-423 and MIL-Std 188-125 | | Henry | The unit of inductance when induced electromotive force of one volt is produced by the inducing current changing at the rate of one ampere per second | | Hertz | The unit of frequency, equal to one cycle per second | | High Pass Filter | A wave filter having a single transmission band extending from some critical, or cutoff, frequency other than zero, up to infinite frequency |
|
|
|
Got a Question?