Reconfigurable Cavity Filters with Contactless Tuners
Mahmoud Abdelfattah
10.25394/PGS.9770747.v1
https://hammer.purdue.edu/articles/thesis/Reconfigurable_Cavity_Filters_with_Contactless_Tuners/9770747
<p>The recent development of tunable
microwave filters has shown their great potential for being an integral
component in future wireless systems across a wide range of applications. In
the last decade, filters based on tunable evanescent-mode (EVA) cavity
resonators have demonstrated a high performance with high quality factor (Q),
wide tuning range and high power handling. However, the implementation of these
filters suffers from reliability issues and integration complexity which
restricted the practical utilization of these filters in different real-system
applications. This dissertation will present and evaluate several practical and
novel solutions to overcome these practical challenges without compromising the
filter performance. </p>
<p>The first part of the dissertation
focuses on the design of quasi-absorptive bandstop filters with passive
absolute bandwidth compensation utilizing micromachined cavity filters. The
second part of the dissertation presents a novel method to tune
substrate-integrated-waveguide (SIW) cavity filters using contactless tuners.
In this work, a new tuning mechanism is proposed to overcome the mechanical
reliability issues and the sensitive assembly of conventional tunable cavity
filters. Furthermore, a new utilization of dual-mode SIW resonators is
introduced in order to improve response selectivity and realize constant
absolute bandwidth filters without compromising filter size and performance. </p><br>
2019-10-16 19:01:37
Microwave filters
Reconfigurable filters
tunable filter
evanescent-mode filter
Microwave and Millimetrewave Theory and Technology