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A half wave whip antenna (length of ) has somewhat higher gain than a quarter wave whip, but it has a current node at its feedpoint at the base of the rod so it has very high input impedance. If it was infinitely thin the antenna would have an infinite input impedance, but the finite width gives typical, practical half wave whips an impedance ...
The quarter-wave whip and rubber ducky antennas used with handheld radios such as walkie-talkies and portable FM radios are also monopole antennas. In these portable devices the antenna does not have an effective ground plane, the ground side of the transmitter is just connected to the ground connection on its circuit board .
At the lowest resonant frequency that arm is slightly under a quarter-wave long. Both dipoles and monopoles are often built large enough to be self-resonant; usually each arm is a quarter-wave long. However a few types of linear antennas are specifically made too small to resonate – short whip antennas, and unplanned random wire antennas, for ...
The waves are shown graphically by bars of color (red for voltage, V and blue for current, I) whose width is proportional to the amplitude of the quantity at the corresponding point on the antenna. The quarter-wave elements imitate a series-resonant electrical element due to the standing wave present along the conductor. At the resonant ...
In the ground plane antenna style whip antenna, the plane consists of several wires 1 / 4 λ long radiating from the base of a quarter-wave whip antenna. The radio waves from an antenna element that reflect off a ground plane appear to come from a mirror image of the antenna located on the other side of the ground plane.
The quarter-wave monopole, the most compact resonant antenna, may be the most widely used antenna in the world. The five-eighth wave monopole – length 0.625 λ , or 5 / 8 of a wavelength – is also popular, since at that length monopoles direct the greatest proportion of their radiated power horizontally, hence the best use of ...