enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   The category of simple antennas consists of dipoles, monopoles, and loop antennas. Nearly all can be made with a single segment of wire (ignoring the break made in the wire for the feedline connection). [citation needed] Dipoles and monopoles called linear antennas (or straight wire antennas) since their radiating parts lie along a single ...

3. Loop antenna - Wikipedia

   en.wikipedia.org/wiki/Loop_antenna

   In contrast, small-loop / "magnetic" antennas better tolerate being mounted close to the ground, [m] so all parts of loop antennas, including the high-voltage parts, are more often within easy reach. In summary: the high voltages from high Q pose a greater threat in small loops than most other small antennas, and demand greater caution, even ...

4. Citizens band radio - Wikipedia

   en.wikipedia.org/wiki/Citizens_band_radio

   After the 1973 oil crisis, the U.S. government imposed a nationwide 55 mph speed limit, and fuel shortages and rationing were widespread.Drivers (especially commercial truckers) used CB radios to locate service stations with better supplies of fuel, to notify other drivers of speed traps, and to organize blockades and convoys in a 1974 strike protesting the new speed limit and other trucking ...

5. Radio-frequency identification - Wikipedia

   en.wikipedia.org/wiki/Radio-frequency_identification

   an antenna for receiving and transmitting the signal; a substrate [17] The tag information is stored in a non-volatile memory. [17] The RFID tag includes either fixed or programmable logic for processing the transmission and sensor data, respectively. [citation needed] RFID tags can be either passive, active or battery-assisted passive.

6. Direction finding - Wikipedia

   en.wikipedia.org/wiki/Direction_finding

   Antennas are generally sensitive to signals only when they have a length that is a significant portion of the wavelength, or larger. Most antennas are at least 1 ⁄ 4 of the wavelength, more commonly 1 ⁄ 2 – the half-wave dipole is a very common design. For longwave use, this resulted in loop antennas tens of feet on a side, often with ...

7. Extremely low frequency - Wikipedia

   en.wikipedia.org/wiki/Extremely_low_frequency

   The rights of way of the two perpendicular 14 mile (23 km) overhead transmission lines that constituted the ground dipole antenna which radiated the ELF waves can be seen at lower left. Extremely low frequency ( ELF ) is the ITU designation [ 1 ] for electromagnetic radiation ( radio waves ) with frequencies from 3 to 30 Hz , and corresponding ...