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Double Metaloop Antenna

Inner and outer metaloops backed by a ground plane constitute a double metaloop (D-ML) antenna. The height of the D-ML antenna above the ground plane is small: on the order of lambda/100 at the design frequency. The outer metaloop creates a null within the circularly polarized (CP) beam pattern generated by the inner metaloop. The null is formed through a difference in the excitation voltage sources for the two metaloops. It is revealed that the null is moved in the elevation plane by changing the amplitude/power of the excitation voltages, and that the null is rotated in the azimuth direction by changing the phase of the excitation voltages.