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Advantages of Vivaldi antenna | disadvantages of Vivaldi antenna

This page covers advantages and disadvantages of Vivaldi antenna. It mentions Vivaldi antenna advantages or benefits and Vivaldi antenna disadvantages or drawbacks.

What is Vivaldi antenna?

Introduction:
The novel design of vivaldi antenna is initially proposed by Gibson in the form of notch or tapered slot antenna. They are simple planar broadband antennas.

Vivaldi antenna

As shown in the figure-1, it consists of tapered slot cut in a thin film of metal with or without electrically thin substrate on one side of the film. It is usually used between 2 to 20 GHz range. They provide medium gain which depends on length of the taper and shape of the curvature. The gain varies with frequency and it is between 4 dBi to 8 dBi.

Following are the three types of Vivaldi antenna.
• Tapered slot antenna
• Antipodal vivaldi antenna
• Balanced antipodal vivaldi antenna

Benefits or advantages of Vivaldi antenna

Following are the benefits or advantages of Vivaldi antenna:
➨It offers wide bandwidth characteristics and hence used for wideband signals.
➨It offers higher directivity.
➨(Tapered slot antenna type) It can produce symmetrical radiation pattern in H-plane and E-plane.
➨(Tapered slot antenna type) Bandwidth can be changed by varying antenna parameters such as shape, length, dielectric constant and dielectric thickness etc.

Drawbacks or disadvantages of Vivaldi antenna

Following are the disadvantages of Vivaldi antenna:
➨It is costlier due to complex fabrication process.
➨Manufacturing of Balanced antipodal vivaldi antenna is more complex due to its tri-plate structure.



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