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Dielectric Lens Antenna

A horn antenna is one of the most commonly used antenna types for a focused antenna. However, the horn antenna is limited by its dimensions, which must have a certain size relative to the wavelength in order to work properly and efficiently. Since this will typically be too large to fit into the flange, a dielectric lens antenna with reduced dimensions is developed. The lens has the spherical form which is able to enhance the gain by making use of guided surface waves. The antenna is fed by a circular waveguide and at the boundary of the dielectric half space. A stepped impedance transformer has been introduced in order to provide broadband input matching impedance.

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,,,and here is how you can get an increase in directivity  with a dielectric feed on cantenna,,,

 

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,,, and another version with a spherical dielectric lens, which have diameters  244 and 305mm...

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