An article, comprising: a dielectric structure (300, 900, 900') comprising: one or more regions (302, 904, 1902) of at least one solid material having a dielectric constant greater than four, wherein at least one region of the one or more regions (302, 904, 1902) of at least one solid material comprising a solid particle being anisotropic with a larger first average particle dimension ( d maj) in a first plane and a smaller second average particle dimension ( d min) in a second plane perpendicular to the first plane; and a plurality of regions (304, 902, 1904) of vacuum or gas, wherein at least one region of vacuum or gas of the plurality of regions (304, 902, 1904) of vacuum or gas comprising pores being anisotropic with a larger first average pore dimension ( d' maj) in a first plane and a smaller second average pore dimension ( d' min) in a second plane perpendicular to the first plane; wherein at least one of: an aspect ratio of d maj to d min for the at least one region (302, 904, 1902) of at least one solid material is equal to or greater than four; and an aspect ratio of d' maj to d' min for the at least one region (304, 902, 1904) of vacuum or gas is equal to or greater than four, and wherein the plurality of regions (304, 902, 1904) of vacuum or gas are dispersed throughout the one or more regions (302, 904, 1902) of at least one solid material, wherein the first average particle dimension ( d maj) and first average pore dimension ( d' maj) are oriented at an angle (α) less than 45° between the first plane in a cross-section to an axis perpendicular to the electric field, such that, upon application of an electric field to the dielectric structure (300, 900, 900'), the average electric field in the one or more regions (302, 904, 1902) of at least one solid material is less than the average electric field in the plurality of regions (304, 902, 1904) of vacuum or gas. one or more regions (302, 904, 1902) of at least one solid material having a dielectric constant greater than four, wherein at least one region of the one or more regions (302, 904, 1902) of at least one solid material comprising a solid particle being anisotropic with a larger first average particle dimension ( d maj) in a first plane and a smaller second average particle dimension ( d min) in a second plane perpendicular to the first plane; and a plurality of regions (304, 902, 1904) of vacuum or gas, wherein at least one region of vacuum or gas of the plurality of regions (304, 902, 1904) of vacuum or gas comprising pores being anisotropic with a larger first average pore dimension ( d' maj) in a first plane and a smaller second average pore dimension ( d' min) in a second plane perpendicular to the first plane; wherein at least one of: an aspect ratio of d maj to d min for the at least one region (302, 904, 1902) of at least one solid material is equal to or greater than four; and an aspect ratio of d' maj to d' min for the at least one region (304, 902, 1904) of vacuum or gas is equal to or greater than four, and an aspect ratio of d maj to d min for the at least one region (302, 904, 1902) of at least one solid material is equal to or greater than four; and an aspect ratio of d' maj to d' min for the at least one region (304, 902, 1904) of vacuum or gas is equal to or greater than four, and wherein the plurality of regions (304, 902, 1904) of vacuum or gas are dispersed throughout the one or more regions (302, 904, 1902) of at least one solid material, wherein the first average particle dimension ( d maj) and first average pore dimension ( d' maj) are oriented at an angle (α) less than 45° between the first plane in a cross-section to an axis perpendicular to the electric field, such that, upon application of an electric field to the dielectric structure (300, 900, 900'), the average electric field in the one or more regions (302, 904, 1902) of at least one solid material is less than the average electric field in the plurality of regions (304, 902, 1904) of vacuum or gas.