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Advantages of Sinuous antenna | disadvantages of Sinuous antenna

This page covers advantages and disadvantages of Sinuous Antenna or spiral antenna. It mentions Sinuous

What is Sinuous or spiral antenna?

The sinuous antenna has been designed to achieve better performance compare to spiral antenna having same size. It has capability to sense circular polarisations of both types viz. RHCP and LHCP simultaneously. Hence it is also known as "Dual polarised sinuous antenna". It is specific type of log periodic antenna.

It has two output ports which provide maximum response to left hand circularly polarised and right hand circularly polarised signals. It is also capable to respond to linearly polarised signals.

Sinuous antenna

Due to two ports in the design, it can always receive any polarised signal which is not less than 3 dB below the matched polarisation sensitivity. It has four arms which are rotated at 90 degrees to each other. The four arms circularly oscillate +/- 45 degrees with increasing distance from the center.

It is slowly taking the position of spiral antennas and are used in anti-radiation missile system. It is widely used in electronic warfare systems.

Benefits or advantages of Sinuous antenna

Following are the benefits or advantages of Sinuous antenna:
➨Slant polarisation of 45 degree is achievable without polariser.
➨It offers higher bandwidth.
➨It is very useful for phased focal plane array application.
➨It is easy to fabricate.
➨It has wide range of advantages for UWB applications.

Drawbacks or disadvantages of Sinuous antenna

Following are the disadvantages of Sinuous antenna:
➨Design of sinuous geometry as well as feed design is complex to certain extent.

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