SIW Q-band filters using advanced multilayer PCB technology
Résumé
This paper deals with the design of Q-band filters
using a low-cost multilayered Printed Circuit Board (PCB)
substrate. In order to meet strong electrical specifications, the
Substrate Integrated Waveguide (SIW) technique has been used
to take profit of the complete build-up of the multilayered PCB.
Advanced fabrication techniques of vias and micro-vias have also
been developed in this project to implement 4th and 6th-order
filters in this technology. The challenge here is to use a standard
PCB process to design complex microwave devices that usually
require accurate fabrication process and very low tolerances,
especially in such frequency ranges. Based on that, two 2.8x8mm²
prototypes have been designed, simulated and fabricated on a
1mm-thick PCB made of copper and blend of high performance
resin material. Regarding the results of these filters, measured
insertion & return losses are in a very good agreement with the
simulation while exhibiting high rejections and low footprint.