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Advantages of YAGI Antenna,disadvantages of YAGI UDA Antenna

This page covers advantages and disadvantages of YAGI UDA Antenna. It mentions YAGI Antenna advantages or benefits and YAGI Antenna disadvantages or drawbacks. It also describes Yagi Antenna basics.

What is YAGI UDA Antenna?

Introduction:
The antenna structure which consists of one driven element, one or more directors (i.e. parasitic elements) and one reflector with configuration arranged as shown in the figure-1 is known as YAGI UDA antenna. Parasitic elements are arranged collinearly and are kept nearer to each other.

YAGI-UDA Antenna or YAGI ANTENNA

The radiation pattern of YAGI antenna is uni-directional and has gain of about 7 dB. It can be used at HF and VHF frequencies.

YAGI ANTENNA Radiation Pattern

The spacing between driven element, director element and reflector is kept to about 0.15λ. Back lobes in the radiation pattern are reduced by keeping radiators closer to each other. The reflector length is about 5% bigger compare to driven element while directors are about 5% shorter compare to driven element. Usually dipoles are used as driven element.

It uses one reflector and multiple director elements which are either having equal length or having decreasing length. The bigger parasitic elements act as reflector while shorter parasitic elements act as director or concentrator of the radiation.
Refer Antenna tutorial >> and antenna types >>.

Benefits or advantages of YAGI Antenna | YAGI UDA Antenna

Following are the benefits or advantages of YAGI Antenna:
➨It is compact in size and light in weight.
➨It offers wide bandwidth due to use of folded dipole.
➨It offers unidirectional radiation pattern which is reasonably good.
➨It offers substantial increase in directivity and gain compare to simple dipole antenna.
➨It is lower in cost and simple to build.
➨It can be mounted easily on vertical poles or other poles with standard mechanical fixings.

Drawbacks or disadvantages of YAGI Antenna | YAGI UDA ANTENNA

Following are the disadvantages of YAGI Antenna:
➨It does not offer very high gain. It offers moderate gain of about 7 dB. Antenna length increases to achieve higher gain.
➨It is sensitive to frequency.
➨Bandwidth is reduced if more number of director elements are used in array.
➨The design is obstructive in nature.



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