As mm-wave systems continue to push toward higher levels of integration and reduced form factors, ceramic materials play an increasingly important role in enabling miniaturization. High-permittivity, low-loss ceramics such as alumina allow guided-wave structures to operate at significantly smaller cross-sectional dimensions than air-filled hollow waveguides, making them especially attractive for compact, high-frequency components.
The ceramic-based components presented in this work were manufactured by Horizon Microtechnologies using a precision ceramic additive manufacturing workflow built on Boston Micro Fabrication’s (BMF) micro-precision 3D printing technology. BMF’s platform enables the fabrication of ceramic green bodies with highly accurate internal and external geometries, supporting the fine feature resolution and dimensional control required for mm-wave operation. This precision is essential when working with ceramic-loaded structures, where even small deviations can impact impedance, mode propagation, and overall electromagnetic performance.
Using micro-scale additive manufacturing, Horizon is able to produce complex ceramic geometries — including waveguide paths, junctions, and integrated filter features — as monolithic parts that would be extremely difficult or impractical to realize using conventional ceramic machining or assembly-based approaches. After printing, the ceramic parts are sintered to full density, preserving the dimensional fidelity of the original BMF-printed geometry while delivering the mechanical and dielectric properties required for high-frequency operation.
Horizon then applies high-conductivity external metallization to the sintered ceramic structures wholly or partially, creating fully functional dielectric-loaded waveguide components with smooth, electrically continuous surfaces. This approach enables the integration of multiple functions — such as waveguides, antennas, and filters — into a single compact component, eliminating alignment errors and reducing assembly complexity.
An example of this capability is the integrated ceramic-loaded module operating at 50 GHz, which combines a waveguide feed, junction, rod antenna, and filter within a single, partially metallized alumina body. By leveraging BMF’s micro-precision ceramic printing and Horizon’s metallization expertise, this component achieves a reduction in size of approximately three times in each dimension compared to an equivalent air-filled hollow waveguide system, while maintaining excellent electromagnetic performance.
This combination of BMF’s ceramic precision additive manufacturing and Horizon’s coating and application engineering expertise enables a new class of highly compact, application-ready mm-wave components. The result is not only miniaturization at the component level, but also greater flexibility in system architecture, higher packing density, and accelerated development cycles for next-generation mm-wave technologies.
