Nonreciprocal Horn Antennas Using Angular Momentum-Biased Metamaterial Inclusions

PROJECT TITLE :

Nonreciprocal Horn Antennas Using Angular Momentum-Biased Metamaterial Inclusions

ABSTRACT:

During this work, we tend to apply angular momentum-biased metamaterials to interrupt the intrinsic reciprocity of antenna systems, with potential applications to satellite Communications. We focus our attention on a conical horn antenna exhibiting nonreciprocal response for left-handed and right-handed circularly polarized fields. A metallic screen with an annular aperture is placed between the feeding waveguide and also the horn. This inclusion is loaded with modulated capacitors to realize a nonreciprocal transmittance for circularly polarized fields impinging from opposite sides. We have a tendency to gift the analysis of the nonreciprocal annular inclusion and explain its nonreciprocal response, obtained through proper spatiotemporal modulation, with the assistance of a similar transmission-line representation. A potential practical implementation of the modulation circuit based on band-pass and band-stop filters is also discussed. The electrical and radiating performance of the conical horn is numerically evaluated, showing the flexibility of the proposed antenna to filter signals with same polarization in two separate bands, e.g., uplink and downlink bands of a satellite link, relying on the propagation direction of the signal. These results might pave the way to many attention-grabbing applications of nonreciprocal radiators in satellite and radar systems.

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