Fractal Antenna Systems, Inc.

Ryan Thistle

Nathan Cohen

Philip Salkind

Daniel Earle

A J Shelman-Cohen

Novel directional antennas are disclosed which utilize plasmonic surfaces (PS) that include or present an array of closely-spaced parasitic antennas, which may be referred to herein as 'parasitic arrays' or fractal plasmonic arrays (FPAs). These plasmonic surfaces represent improved parasitic directional antennas relative to prior techniques and apparatus. Substrates can be used which are transparent and/or translucent.

Parasitic antenna arrays incorporating fractal metamaterials

Systems according to the present disclosure provide one or more surfaces that function as power radiating surfaces for which at least a portion of the radiating surface includes or is composed of 'fractal cells' placed sufficiently closed close together to one another so that a surface wave causes near replication of current present in one fractal cell in an adjacent fractal cell. The fractal cells may lie on a flat or curved sheet or layer and be composed in layers for wide bandwidth or multibandwidth transmission. The area of a surface and its number of fractals determines the gain relative to a single fractal cell. The boundary edges of the surface may be terminated resistively so as to not degrade the cell performance at the edges. Fractal plasmonic surface cards are described.

Directional antennas from fractal plasmonic surfaces

Vivaldi tapered slot and Vivaldi horn antennas that feature or include fractal plasmonic surfaces ('FPS') are described. Vivaldi slot antennas are described which include a conductive surface defining a tapered slot, with the conductive surface including a plurality of fractal resonators which form or constitute a fractal plasmonic surface (FPS). In some embodiments the fractal resonators can be defined by slots. In some embodiments the fractal resonators can include self-complementary features. In exemplary embodiments, two Vivaldi horn antennas may be used for a Vivaldi horn antenna. The two Vivaldi FPS antennas can be arranged in a crossed or cross configuration such that the two antennas are essentially perpendicular to one another and are therefore able to receive and transmit two orthogonal polarizations of radiation. The two antennas can be fed by separate respective feed lines. The two antennas can be mounted inside of a horn or casing.

Vivaldi horn antennas incorporating FPS

Novel directional antennas are disclosed which utilize fractal plasmonic surfaces (FPS) that include or present an array of closely-spaced parasitic antennas, which may be referred to herein as 'parasitic arrays' or fractal plasmonic arrays (FPAs). These fractal plasmonic surfaces represent improved parasitic directional antennas relative to prior techniques and apparatus.

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Waltham, MA, United States of America

Ryan Thistle