What are the parasitic elements of Yagi-Uda antenna?

A Yagi antenna with one driven element (A) called a folded dipole, and 5 parasitic elements: one reflector (B) and 4 directors (C). The antenna radiates radio waves in a beam toward the right.

How do the driven element of an Yagi antenna behave?

The Yagi antenna propagates electromagnetic field energy in the direction running from the driven element toward the director(s), and is most sensitive to incoming electromagnetic field energy in this same direction. The more directors a Yagi has, the greater the forward gain and the longer the antenna becomes.

Which element is needed for a Yagi antenna?

It has five elements: three directors (to left) one reflector (to right) and a driven element which is a folded dipole (double rod) to match the 300 Ω twin lead feedline. The beam direction (direction of greatest sensitivity) is to the left.

What is the radiation pattern of Yagi-Uda antenna?

Explanation: Radiation pattern of a Yagi-Uda antenna is end-fire. It has its main beam parallel to the axis of antenna (boom). The addition of directors will increase the gain of antenna while reflectors will increase the directivity of antenna.

What are the parasitic elements?

In electrical networks, a parasitic element is a circuit element (resistance, inductance or capacitance) that is possessed by an electrical component but which it is not desirable for it to have for its intended purpose.

What is a parasitic element of an antenna Mcq?

Explanation: A parasitic array consists of a basic antenna connected to a transmission line plus one or more additional conductors that are not connected to the transmission line. These extra conductors are referred to as parasitic elements, and the antenna itself is referred to as the driven element.

What is driven antenna?

In a multielement antenna array, the driven element or active element is the element in the antenna which is electrically connected to the receiver or transmitter. In a transmitting antenna it is driven or excited by the RF current from the transmitter, and is the source of the radio waves.

What do you mean by driven elements in Yagi array?

In a multielement antenna array (such as a Yagi-Uda antenna), the driven element or active element is the element in the antenna (typically a metal rod) which is electrically connected to the receiver or transmitter. The driven element is often a dipole.

What does a Yagi antenna do?

A Yagi antenna is a directional antenna that improves radiation in a single direction, and such radiation can be either transmission or reception of energy, such as cell signal.

How does a Yagi-Uda antenna works?

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.

Why is Yagi-Uda antenna known as parasitic array?

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. As a result these additional elements are referred to as parasitic elements.