Miniaturized Passive Two-Path Notch Filter For UWB receiver
R. Lababidi *, A. Mansour, F. Le Roy
Lab-STICC- ENSTA Bretagne
Brest, France
Corresponding author: raafat.lababidi@ensta-bretagne.fr
J. Gaubert, S. Bourdel
IM2NP - UMR CNRS 7334, University of Aix-Marseille
Campus de Saint-Jérôme, Avenue Escadrille Normandie Niemen-Case 142, F-13397 Marseille Cedex, France

In this paper, the RF characteristics of the flexible Kapton-based substrate are investigated by using the microstrip ring resonator in order to characterize the 
relative permittivity (år) and loss tangent (tanä) of the substrate at Ultra Wide Band (UWB) range. A compact notch filter using the approach of phase 
cancellation between two signal paths is also reported here. The passive notch filter is designed onto a Rogers4003-based substrate to test its performance. The 
integrated silicon chip is then reported on a grounded area of filter and connected to the output of this later by wire-bonding forming an SIP (System In 
Package) approach. The complete design is fully simulated using HFSS simulation tools, featuring high rejection at the central frequency and very low insertion 
loss far from the notch frequency.
Keywords— Flexible Substrate; Ring Resonator; SIP; Notch Filter; UWB receiver