Size Reduction of Electromagnetic Devices Using Double Near-Zero Materials

The phase pattern tailoring and finite/nonzero wave impedance properties of double-near-zero materials, which have both the permittivity and permeability close to zero, are utilized to reduce the size of certain electromagnetic devices. As a proof of concept, it is applied to internal and external cloaks and field concentrators. The proposed technique enables reducing the size of the investigated devices by 50% by changing their structure from a full cylinder to half cylinder. The half-sized devices can still perform the functions of their full-size counterparts. To understand the phenomenon and validate the numerical results, the method is proven analytically for the internal cloak. The same analysis can also be applied for the external cloak and concentrator. For the included analysis, the transverse electric Z-polarization is used. For the transverse magnetic Z-polarization, the duality principal can be applied.