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How does an antenna convert electrical?
Antennas have two complementary functions: converting electromagnetic waves into voltage and current used by a circuit, and converting voltage and current into electromagnetic waves which are transmitted into space. Sometimes parts of electric circuits may have characteristics that unintentionally make them antennas.
What does a receiving antenna do?
Receiving antenna – a device for reception of radiofrequency (RF) A receiving antenna performs the reverse of the process performed by the transmission antenna. It receives radiofrequency radiation and converts it into electric currents in an electric circuit connected to the antenna.
Does a receiving antenna radiate?
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 (radio waves). An antenna is an array of conductors (elements), electrically connected to the receiver or transmitter.
How is the current in an antenna related to the voltage?
The long answer is ” Maxwell’s equations “. If you don’t want to understand all the gritty details of that math, then here’s a simple, incomplete understanding: the current in an antenna is associated with a magnetic field, and the voltage is associated with an electric field.
How is a signal transmitted through an antenna?
Signals are transmitted through space by electromagnetic waves consisting of electric fields measured in Volts per meter and magnetic fields measured in Amps per meter. Depending on the type of field being detected, the antenna takes on a particular construction.
How is the inductance of an antenna determined?
The circulation of this magnetic field results in inductance of the antenna. The antenna is therefore a reactive device having both capacitance from the charge distribution and inductance from the current distribution. Figure 3. (a) Electric field E and (b) magnetic field H and TEM field from dipole charge and current
How does a dipole antenna produce an electric field?
If the plates are spread apart so that they lie in the same plane, the electric field between the plates extends out into space. The same process occurs with an electric field dipole antenna as shown in Figure 2 (b). Charges on each part of the antenna produce a field into space between the two halves of the antenna.