Reconfigurable Planar SIW Cavity Resonator and Filter

Abstract

A new reconfigurable frequency cavity compatible with planar technology has been designed, manufactured and measured. An original tuning solution is proposed, based upon the insertion of vertical capacitive posts integrated within SIW cavities. One extremity of each post is connected to a floating metallic ring, located on the substrate supporting the SIW cavity. The frequency agility is obtained once the metallic ring is connected to the ground plane by short-circuited the corresponding annular slot using surface actuators. Such combination of volumic cavity and planar activation leads to reconfigurable filters with high Q values and simplified tuning control conditions.

Compact CPW-Fed Combline Filter in Substrate Integrated Waveguide Technology

“…Although the insertion of metallic posts as perturbing elements of the TE 101 mode in SIW circuits had been already explored in [1] for reconfiguration purposes, the authors have recently proposed that a combline resonator in SIW technology can be built by inserting an opened-shorted plated via hole inside the cavity [2].…”

Mechanical Tuning of Substrate Integrated Waveguide Filters

“…In [7], the authors proposed the inclusion of PIN diodes to obtain discrete electrical tuning. Discrete mechanical tuning is proposed in [8] by opening or shortcircuiting a capacitive circular slot, with a tuning range of 5%, or by using MEMS devices [9] with a tuning range of 7%. A more complex system is presented in [10] which uses a cylinder of plasma in the resonator, but presents only simulated results.…”

SIW‐based interdigital bandpass filter with harmonic suppression

“…Recently, capacitive posts are integrated within SIW cavities to realize combline resonators in SIW technology, which are then used to design an X‐band SIW‐based combline BPF in . In this article, similar resonators to the ones presented in are used to design a novel SIW‐based interdigital BPF, where each resonator is configured reversely with respect to the adjacent one within the SIW cavity (and hence, forms interdigital type SIW resonators).…”