Highly-Miniaturized Packaged UWB 7th-Order Bandpass Filter

S. Cadiou (1) , Benjamin Potelon (1) , Cédric Quendo (1) , Eric Rius (1) , Jean-François Favennec (1) , Rémi Ségalen (2) , Françoise Mahé (2)

1 Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (UMR 3192)
2 TSA - Thales Systèmes Aéroportés

This paper describes an original filtering solution for specifications in the Ultra Wide Band (UWB) (3.1 to 10.6 GHz). This 7th-order filter is based on an association of series- and parallel-resonators, where open-ended coupled-lines are used as series resonators, and open-ended stepped-impedance half-wavelength stubs as the parallel ones. Addition of open-ended half-wavelength stubs enhanced the rejection level close to the band edges. This UWB filter was realized in microstrip technology on a 254-μm-thick alumina substrate of permittivity 9.9. It was also strongly miniaturized to be put in a 0.32 x 0.32 inch2 Stratedge package and mounted on a FR4 plate for measurements: its insertion loss is 5 dB, and rejection in the lower and the upper bands is 31 and 20 dB, respectively. The measured return losses are better than 11.8 dB.

Domaines: Electronique; Electromagnétisme

S. Cadiou, Benjamin Potelon, Cédric Quendo, Eric Rius, Jean-François Favennec, et al.. Highly-Miniaturized Packaged UWB 7th-Order Bandpass Filter. 40 th Microwave Conference (EuMC), 2010 European, Sep 2010, Paris, France. pp.EuMC46-3. ⟨hal-00575009⟩