3D-Printed Dielectric Resonators for Quasi-TE112 Mode Singlets, Doublets and Dual-Mode Filters

Abstract

This paper demonstrates the use of a ceramic-based stereolithography additive manufacturing process in the fabrication of higher-order mode dielectric resonators. In this work, dielectric resonators with concentric disks around a combline rod structure are 3D-printed using alumina. The integration of the concentric disks for use of the TE 112 mode allows for a more compact cavity structure and a higher unloaded quality factor when compared to a simple dielectric combline resonator with a similar S-parameter response. The achievable improvements in quality factor for the TE 112 -mode resonators utilising concentric disks are compared through simulations and experimental results. The measured results demonstrate an increased average in the unloaded quality factor of Q u ≈ 2172 which is approximately 44%. Additionally, the application of the 3D-printed resonators is further demonstrated in a TE 112 singlet, doublet, and dualmode filter configuration.

A 3-D-Printed Dielectric Resonator for Triple-Mode Applications

“…Many approaches to miniaturization exist, such as the use of dielectric resonators, which reduce the structural size by compressing the electromagnetic fields [1], metamaterials [2], and multimode monoblock filters [3]. In a recent work on utilizing ceramic additive manufacturing (AM) for dielectric combline resonators [4], the quality factor performance of higher modes was increased and dual-mode operation was achieved through changes in the geometry. In this work, the concept of periodic changes in the geometry is expanded to triple-mode operations.…”