| Electrical Communication is a free textbook on the basics of communication technology. See the editorial for more information.... |
|
Home  Radio Wave Propagation and Antennas The Wave Antenna |
|
 Search the VIAS Library | Index
|
  |
The Wave AntennaThis is defined34 as "a directional antenna composed of a system of parallel, horizontal conductors from one-half to several wavelengths long, and terminated to ground at the far end in its characteristic impedance." The wave antenna, or Beverage antenna34 has been extensively used as a long-wave, low-frequency, antenna. In its simplest form it consists of a single horizontal ware about one wavelength long pointed toward the distant station. The end of the line nearer the distant transmitting station is grounded through an impedance approximately equal to the characteristic impedance of the antenna when regarded as a transmission line consisting of one wire and ground return. The other end is connected through the receiving equipment to ground. The action of this antenna is explained52 as follows: The incoming wave front is tilted forward slightly; thus, when an incoming wave travels along the antenna, a voltage is induced in it52 This voltage increases as the wave nears the receiving station. A wave along the line from the opposite direction will be absorbed at the terminating impedance. Waves coming from broadside will induce very little voltage, and thus the wave antenna is highly directive.
|
|
| Home Radio Wave Propagation and Antennas The Wave Antenna |
|
Last Update: 2011-05-30