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Antenna

3:29

CRYSTAL CLEAR SOUND FROM A VERY INTERESTING CRYSTAL DIODE RADIO. IT HAS FLEXIBLE ("FRAME") ANTENNA.

1:45

World's Simplest Radio

3:00

Homemade Diode

2:24

World's Simplest Radio (4K)

3:04

FOXHOLE RADIO FROM THE PENCIL AND THE BLADE / TUTORIAL

In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. In transmission, a radio transmitter supplies an electric current to the antenna's terminals, and the antenna radiates the energy from the current as electromagnetic waves. In reception, an antenna intercepts some of the power of an electromagnetic wave in order to produce an electric current at its terminals, that is applied to a receiver to be amplified. Antennas are essential components of all radio equipment, and are used in radio broadcasting, broadcast television, two-way radio, communications receivers, radar, cell phones, satellite communications and other devices.
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  • Terminology 

  • Overview 

  • Reciprocity 

  • Resonant antennas 

  • Current and voltage distribution 

  • Electrically short antennas 

  • Arrays and reflectors 

  • Modeling antennas with line equations 

  • Characteristics 

  • Bandwidth 

  • Gain 

  • Effective area or aperture 

  • Radiation pattern 

  • Efficiency 

  • Polarization 

  • Impedance matching 

  • Effect of ground 

  • Mutual impedance and interaction between antennas