What is the loop antenna?

The loop antenna is an antenna that creates a continuous conductive path between one two -wire transmission line to another. There are three categories of loop antennas: small, medium and large. A small loop is considered, so if its perimeter is less than the wavelength. Most of the directional reception loops are approximately one tenth of the wavelength. It is also less sensitive to nearby electrical noise than other antennas when they are properly protected. If a small loop is brought to resonance by means of a tuning capacitor, its receiving voltage can be significantly increased. When the signal arrives along the loop axis, the same amount of voltage will be induced in each limb to take into account symmetry. Because the output of the loop is the difference in the voltage between the two limbs, it should always be zero. If the signal arrives on the plane loops, it creates a phase difference between the limb voltage. These signals create maximum power for a small loop.

There are two specific cases where the loop antenna is classified as a medium loop. These cases therefore have specific properties. The first housing occurs when the half -wave length loop is mounted in the horizontal plane. This creates a horizontally polarized icing antenna, an antenna that evenly radiates power in the horizontal plane. The second case is the case of a loop full of wavelength, which radiates on its axis. These loops often occur as elements of four -cylinder antennas used by amateur radio operators. Are polarized according to the position of their feeding point.

The large loop antenna is essentially a dipole antenna that was connected at the ends to form a circle, triangle or square. Those that have been formed in triangles are called Delta Loop antennas. Circular loops gain about ten percent more profit than any of the other forms, but thanks to their shape it is difficult to support. For this reason, they are triangular and square inLook loops much more common. Large loops usually have a much stronger signal in the loop plane rather than along the axis. This remains true if the loop is not too big.

Some loops antennas can also be tuned to the AM broadcast band. The AM loop antenna is usually tuned by a capacitor. They can also be wound around the ferrite rod to increase the aperture. Ferit is a ceramic material used in applications from magnetic components to microelectronics. The antennas wound around these bars are commonly referred to as loop antennas due to the shape of the wire. These antennas work well for receiving, but are inefficient and impractical for transmission.