Measurement Technique for Microwave Surface Resistance of Additive Manufactured Metals

Additive manufactured (AM) metals are a subject of much interest for their performance in passive microwave applications. However, limitations could arise due to artifacts, such as surface texture and/or roughness resulting from the manufacturing process. We have, therefore, adopted parallel plate resonator accurate measurement resistance flat metal plates, allowing current flow two orthogonal directions by simply exciting different resonant mode (at 5.3 and 6.4 GHz), without need remove refix sample. The systematic random errors associated with very small, less than 1% 0.1%, respectively. technique is demonstrated measurements on range samples alloys, AlSi10Mg Ti6Al4V, laser powder bed fusion, addition traditionally machined bulk alloys aluminum brass. For AM AlSi10Mg, we have studied effect directional features, generated raster paths, transverse or flow. Importantly device applications, demonstrate that these exhibit no anisotropy features.