3-D printed filter based on helical resonators with variable width

Abstract

This paper presents a helical resonator bandpass filter produced using a stereolighography (SLA) based 3-D printing technique. The filter is formed of four coupled helical resonators, and for each resonator the helix is fixed at both ends so that the resonator is less prone to vibration. The helix is designed to have variable width and this yields enhanced performance in terms of a higher unloaded quality factor and a spurious resonance at higher frequencies. Such a helix is ideally suited to 3-D printing which allows easy production of complex structures. The whole filter is printed from a resin, then plated with metal, and tested.The measured result has a good agreement with simulations.

A novel 3D metal printing in‐line bandpass filter with multiple controllable transmission zeros

“…Nowadays, 3D printing technology has become increasingly methodical and has improved the performance of RF devices with flexible fabrication and controllable accuracy. For example, 3D printing technology not only easily fabricates devices with complex structures, but also has higher quality factors 12–14 . In Vaitukaities et al, 14 the 3D printing technology displays the ability to fabricate complex deformed elliptical cavity resonator that can introduce independently controlled TZs over an extensive frequency range.…”

“…For example, 3D printing technology not only easily fabricates devices with complex structures, but also has higher quality factors. [12][13][14] In Vaitukaities et al, 14 the 3D printing technology displays the ability to fabricate complex deformed elliptical cavity resonator that can introduce independently controlled TZs over an extensive frequency range. In Rao et al, 15 3D printing technology is used to design a new waveguide loaded air slots' resonator with compact size and highquality factor.…”