An antenna is a transducer
designed to transmit or receive electromagnetic waves. In other
words, antennas convert electromagnetic waves into electrical currents
and vice versa. Antennas are used in systems such as radio and television
broadcasting, point-to-point radio communication, wireless LAN,
radar,
and space exploration. Antennas usually work in air or outer space,
but can also be operated under water or even through soil and rock
at certain frequencies for short distances.
Physically, an antenna is an arrangement of conductors that generate
a radiating electromagnetic field in response to an applied alternating
voltage and the associated alternating electric current, or can
be placed in an electromagnetic field so that the field will induce
an alternating current in the antenna and a voltage between its
terminals. Some antenna devices (parabolic antenna, Horn Antenna)
just adapt the free space to another type of antenna.
Marine Antenna Systems usually require sturdy
marine
antenna mounts to attach the antenna to the ship.
