Partially-Air-Filled Slow-Wave Substrate Integrated Waveguide in Metallic Nanowire Membrane Technology

In this paper, the slow-wave effect and air-filled technology are combined to achieve a compact and efficient substrate integrated waveguide in the W-band. The MnM interposer technology, based on a nanoporous alumina membrane and copper nanowires, allowing a simple through substrate via fabrication, was used. A first partially-air-filled slow-wave substrate integrated waveguide was fabricated and measured, resulting in a reduction of the attenuation constant by 75% at 1.2 times the cut-off frequency as compared to the classic SIW, with similar dimensions.