enow.com Web Search

Search results

1. Results from the WOW.Com Content Network

2. Directional antenna - Wikipedia

   en.wikipedia.org/wiki/Directional_antenna

   Patch antenna gain pattern. A directional antenna or beam antenna is an antenna which radiates or receives greater radio wave power in specific directions. Directional antennas can radiate radio waves in beams, when greater concentration of radiation in a certain direction is desired, or in receiving antennas receive radio waves from one specific direction only.

3. Doppler radio direction finding - Wikipedia

   en.wikipedia.org/wiki/Doppler_radio_direction...

   Early radio direction finding (RDF) solutions used highly directional antennas with sharp "nulls" in the reception pattern. [2] The operator rotated the antenna, looking for points where the signal either reached a maximum or, more commonly, suddenly disappeared or 'nulled'.

4. Antenna types - Wikipedia

   en.wikipedia.org/wiki/Antenna_types

   This article provides a summary description of many of the different antenna types used for radio receiving or transmitting systems. This summary article collects groups of antennas based on their electrical operation. The classification and sub-classifications below follow those typically used in most antenna engineering textbooks. [1] [2] [3 ...

5. Direction finding - Wikipedia

   en.wikipedia.org/wiki/Direction_finding

   However, the klystron was quite unsuitable as it was a narrow-band device and extremely noisy [21]: 392 and the TWT, although potentially more suitable, [21]: 548 has poor matching characteristics and large bulk, which made it unsuitable for multi-channel systems using a preamplifier per antenna. However, a system has been demonstrated, in ...

6. Antenna rotator - Wikipedia

   en.wikipedia.org/wiki/Antenna_rotator

   An antenna rotator (or antenna rotor) is a device used to change the orientation, within the horizontal plane, of a directional antenna. Most antenna rotators have two parts, the rotator unit and the controller. The controller is normally placed near the equipment which the antenna is connected to, while the rotator is mounted on the antenna ...

7. Adcock antenna - Wikipedia

   en.wikipedia.org/wiki/Adcock_antenna

   The Adcock antenna is an antenna array consisting of four equidistant vertical elements which can be used to transmit or receive directional radio waves. The Adcock array was invented and patented by British engineer Frank Adcock and since his August 1919 British Patent No. 130,490, the 'Adcock Aerial' has been used for a variety of ...

8. Antenna (radio) - Wikipedia

   en.wikipedia.org/wiki/Antenna_(radio)

   [12] [13] For example, the "receiving pattern" (sensitivity to incoming signals as a function of direction) of an antenna when used for reception is identical to the radiation pattern of the antenna when it is driven and functions as a radiator, even though the current and voltage distributions on the antenna itself are different for receiving ...

9. Log-periodic antenna - Wikipedia

   en.wikipedia.org/wiki/Log-periodic_antenna

   The log-periodic is commonly used as a transmitting antenna in high power shortwave broadcasting [15] stations because its broad bandwidth allows a single antenna to transmit on frequencies in multiple bands. The log-periodic zig-zag design with up to 16 sections has been used.