PROJECT TITLE :

Design and Multiphysics Analysis of Direct and Cross-Coupled SIW Combline Filters Using Electric and Magnetic Couplings

ABSTRACT:

During this paper, combline substrate integrated waveguide (SIW) filters using electric and magnetic couplings are totally studied. Thus, a negative coupling scheme consisting on an open-ended coplanar probe is proposed and analyzed intimately. Several in-line 3-pole filters at C-band are designed, manufactured and measured showing how the presented approach will be used for implementing direct couplings while enabling an important size reduction and improved spurious-free band compared to conventional magnetic irises. A absolutely-packaged quasi-elliptic four-pole filter is additionally designed at 5.seventy five GHz showing how the negative coupling structure will be used for introducing transmission zeros by means of cross-couplings between non-adjacent resonators. Finally, average and peak power handling capabilities of those filters have been additionally analyzed from a multiphysics point of view. Measured results validate the theoretical predictions confirming that combline SIW filters can handle important levels of continuous and peak power, providing at the same time simple integration, compact size and advanced filtering responses.