| CPC H01P 3/16 (2013.01) [G02B 6/1228 (2013.01); H01P 5/028 (2013.01); H01Q 9/045 (2013.01); H01Q 9/0485 (2013.01)] | 21 Claims |

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1. An electromagnetic device, comprising:
a substrate comprising an elongated aperture having an overall length, L, and an overall width, W, as observed in a plan view of the device, where L is greater than W;
a dielectric medium comprising a dielectric material other than air disposed on the substrate substantially covering the aperture, the dielectric medium having a cross sectional boundary, as viewed in the plan view of the device, that is symmetrical with respect to an in-plane axis of reflection of the dielectric medium;
wherein the device is configured such that a line perpendicular to the overall length L of the elongated aperture and passing through a center point of the elongated aperture is not in any in-plane axis of reflection of the dielectric medium.
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