What is a Yagi antenna How does it work?

Yagi antennas use mutual coupling between standing-wave current elements to produce a traveling-wave unidirectional pattern. It consists of an array of a dipole and additional closely coupled parasitic elements. The elements in the Yagi antenna are usually welded to a conducting rod or tube at their centers.

How does a Yagi antenna radiate?

The parasitic elements of the Yagi antenna operate by re-radiating their signals in a slightly different phase to that of the driven element. In this way the signal is reinforced in some directions and cancelled out in others. The Yagi antenna is able to provide very useful levels of gain and front to back ratios.

Is Yagi antenna unidirectional?

Also called a beam antenna and parasitic array, the Yagi is very widely used as a high-gain antenna on the HF, VHF and UHF bands. It has moderate to high gain depending on the number of elements present, sometimes reaching as high as 20 dBi, in a unidirectional beam pattern.

Why is Yagi Uda antenna used?

It is a highly directional antenna and widely used in to receive TV signals. Now a day’s Yagi -Uda antennas are also used in the fields of RADARs, satellites and RFID applications [2]. The length and spacing of reflector shows significant impact on gain, directivity and radiation pattern of the antenna.

What is meant by unidirectional antenna?

A unidirectional antenna focuses the radiofrequency (RF) energy in one or two directions which lowers the beamwidth and overall area covered, but increases the strength of the signal and distance covered in that direction. In fact, an indoor 14dBi directional antenna can reach up to 3.2km indoors and 6.4km outdoors!

What is the radiation pattern of a Uda antenna?

Radiation Pattern The directional pattern of the Yagi-Uda antenna is highly directive as shown in the figure given below. The minor lobes are suppressed and the directivity of the major lobe is increased by the addition of directors to the antenna.

How does Yagi-Uda antenna radiates explain with neat diagram?

The feeder is the folded dipole. The reflector is the lengthy element, which is at the end of the structure. The figure depicts a clear form of the Yagi-Uda antenna….Designing.

What is Yagi antenna?

A Yagi antenna is a directional antenna consisting of a driven element such as dipole or folded dipole and additional parasitic elements, typically a reflector and one or more directors. It radiates in only one direction and is most commonly used in point-to-point communications.