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.

How does a Yagi antenna radiate?

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.

What type of antenna pattern does a Yagi antenna typically have?

The Yagi–Uda antenna typically consists of a number of parallel thin rod elements, each approximately a half wave in length. Often they are supported on a perpendicular crossbar or "boom" along their centers.

Is Yagi-Uda antenna directional?

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.

What are θ and φ patterns in antenna radiation pattern?

While θ and ϕ are the standard angles in math and science and a lot of antenna theory, for practice on or near the earth's surface, azimuth and elevation angles are frequently used. Azimuth is the same as ϕ, and elevation is 90° − θ. Things get more interesting if we consider a horizontal dipole.

What is the radiation pattern of array antenna?

The array factor consists of orientation and separation information of point sources while the element factor gives the radiation characteristic of given antenna element. The antenna radiation pattern can be calculated by multiplying the array factor with the element factor of given antenna [1].

Is Yagi omnidirectional?

While a Yagi antenna or other directional antenna will only pull in signal from one narrow direction, omni antennas can pull signal from elsewhere. In fact, that's what makes the omnidirectional antennas perfect for most uses.

What is the working principle of Yagi-Uda antenna?

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 are radiation patterns made?

Radiation Pattern in 2D Two-dimensional pattern can be obtained from three-dimensional pattern by dividing it into horizontal and vertical planes. These resultant patterns are known as Horizontal pattern and Vertical pattern respectively.

What are the characteristics of Yagi-Uda antenna?

Yagi-Uda Antennas

• Driven Element: 0.45-0.49 wavelengths.
• Directors: 0.4-0.45 wavelengths.
• Separation between Directors: 0.3-0.4 wavelengths.
• Radii of directors: 0.15-0.25 wavelengths.
• Separation between driven element an parasitics: 0.15-0.25 wavelengths.

What is pattern in antenna?

The radiation pattern or antenna pattern is the graphical representation of the radiation properties of the antenna as a function of space. That is, the antenna's pattern describes how the antenna radiates energy out into space (or how it receives energy).

What is the frequency range of Yagi-Uda antenna?

The frequency of Yagi-Uda antenna ranges between 3 MHz to 300 GHz. Frequencies ranging between 3 MHz and 300 GHz are categorized into VHF, LF, UHF, HF, SHF and EHF [1-6]. Antennas can be used for various applications such as for wireless ccommunications, satellite communication, astronomical antenna etc.

Is Yagi antenna vertical or horizontal?

A Yagi antenna should also be pointed so that the largest fins are closest to the mast and the shortest fins pointed at each other. For Omni directional antennas, they should be in most cases pointed directly vertical. That is to say, pointed directly up into the sky.

Why is it called a Yagi antenna?

The Yagi antenna is named after Japanese engineer Hidetsugu Yagi. Sources vary, but Mr. Yagi either (a) co-invented the antenna with engineer Shintaro Uda in the 1920's, or (b) popularized Uda's antenna design by publishing the first English language accounts and demonstrating the antenna in the U.S.

What is the maximum range of a Yagi antenna?

Use with Long-Range Repeater to extend range up to 5,000′ in all directions.

What is E-plane and H radiation pattern?

A radiation pattern is usually represented graphically for the far-field conditions along the electrical field and the magnetic field vectors, along the direction of maximum radiation or E-plane and H-plane. The E-plane and H-plane are reference planes for linearly polarized antennas.

What are the 3 basic types of antennas?

There are several different types of antennas in three broad categories: omni-directional, directional, and semi-directional.

What is null in antenna pattern?

In radio electronics, a null is a direction in an antenna's radiation pattern where the antenna radiates almost no radio waves, so the far field signal strength is a local minimum. Nulls occur because different parts of an antenna radiate radio waves of different phase.

What is the radiation pattern of parabolic antenna?

The radiation pattern of a parabolic antenna contains a major lobe, which is directed along the axis of propagation, and several small minor lobes. Very narrow beams are possible with this type of reflector.

What is the radiation pattern of loop antenna?

They are the most efficient of all antenna types for both transmission and reception. Large loop antennas have a two-lobe radiation pattern at their first, full-wave resonance, peaking in both directions perpendicular to the plane of the loop.