Keywords: Dipole antenna standing waves animation 461x217x150ms.gif standing waves on a half-wave dipole antenna driven by a sinusoidal voltage V<sub>O</sub> from a radio transmitter at its resonant frequency The oscillating voltage pushes the electrons back and forth along the two metal rods that make up the antenna creating oscillating currents <span style color blue; >blue arrows</span> in the antenna hello this wrong theory charging its ends alternately positive + and negative - Since at this frequency the antenna is a half wavelength λ/2 long a sinusoidal wave of voltage or current takes exactly one cycle to make the round trip from one end of the antenna to the other and back and the reflected waves reinforce each other The antenna acts like an electronic resonater Waves of current and voltage reflecting back and forth between the ends of the rods interfere to form standing waves The waves are shown graphically by bars of color <span style color red; >red for voltage V</span> and <span style color blue; >blue for current I</span> whose width at each point is proportional to the amplitude of the wave at that point There are voltage antinodes maxima and current nodes zero points at each end while there is a voltage node and current antinode at the drive point in the center The large oscillating voltages and currents on the antenna at resonance causes it to radiate maximum radio wave power 2015-06-06 own Chetvorno other versions cc-zero Uploaded with UploadWizard Dipole antennas Animated GIF Antennas Animations of electronics Animations of standing waves |