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- Q4677546 subject Q10210014.
- Q4677546 subject Q7168825.
- Q4677546 subject Q7210690.
- Q4677546 abstract "An active antenna is an antenna that contains active electronic components, as opposed to typical passive components. A passive antenna typically resembles a dipole antenna.An active design allows the construction of antennas of limited size and / or wide frequency range, and are primarily used in situations where a simpler and more receptive large antenna is either impractical (inside a portable radio) or impossible (suburban residential area that disallows use of large outdoor low-frequency antennas).Most active antennas use antenna parts of minimal conducting area, e.g., a small whip, connected to the active component (usually a FET). The signal attenuation caused by the antenna-size-to-wavelength mismatch is compensated by an active circuit. The active circuit consists of an impedance translating stage and an optional amplification stage. This arrangement is especially useful for constructing compact low frequency antennas which, due to budgetary, spatial, or practical requirements (e.g., installation in vehicles), must be downsized. Low frequency signal wavelengths range from one to ten kilometers.Power for the active components may be supplied by batteries, a filtered power supply, or through the signal feeder itself (phantom power). Antennas containing active impedance translating and optionally amplifying stages are usually used only for receiving, since operation of such stages is unidirectional.".
- Q4677546 wikiPageWikiLink Q10210014.
- Q4677546 wikiPageWikiLink Q1126859.
- Q4677546 wikiPageWikiLink Q1187868.
- Q4677546 wikiPageWikiLink Q131214.
- Q4677546 wikiPageWikiLink Q17156810.
- Q4677546 wikiPageWikiLink Q176097.
- Q4677546 wikiPageWikiLink Q204157.
- Q4677546 wikiPageWikiLink Q267298.
- Q4677546 wikiPageWikiLink Q41364.
- Q4677546 wikiPageWikiLink Q429451.
- Q4677546 wikiPageWikiLink Q7168825.
- Q4677546 wikiPageWikiLink Q7210690.
- Q4677546 comment "An active antenna is an antenna that contains active electronic components, as opposed to typical passive components.".
- Q4677546 label "Active antenna".