A 2 pole 9.6–11.7 GHz band stop filter using analog tuning RF MEMS varactors

Author

Mardivirin, David ; Barrière, Fabien ; Pothier, Arnaud ; Crunteanu, Aurélian ; Blondy, Pierre

Author_Institution

XLIM Res. Inst., Univ. de Limoges, Limoges, France

fYear

2011

fDate

10-11 Oct. 2011

Firstpage

530

Lastpage

533

Abstract

A tunable 9.6 GHz to 11.7 GHz bandstop filter is presented. Tuning is done using RF-MEMS structures with analogical capacitance variation, from 25 fF to 225 fF [1]. The filter is a 2 pole design, based on ring resonators coupled on a 50 Ohms micro-strip transmission line. A half-wave line is arranged between the two resonators, to optimize microwave performances with a zero reflection mode, and minimizes the out of band losses. The measured performances are -35 dB of rejection at 9.6 GHz, shifting to -42 dB at 11.7 GHz. The losses below the rejected band are less than -1 dB. This device has also been measured under variable RF power and has shown handling at 6 W.

Keywords

band-stop filters; circuit tuning; micromechanical devices; microstrip lines; microwave filters; resonator filters; transmission lines; varactors; 2 pole design; RF MEMS varactors; RF-MEMS structures; analog tuning; analogical capacitance variation; band stop filter; frequency 9.6 GHz to 11.7 GHz; half-wave line; microstrip transmission line; resistance 50 ohm; ring resonators; zero reflection mode; Bridge circuits; Capacitance; Micromechanical devices; Radio frequency; Resonant frequency; Tuning; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Integrated Circuits Conference (EuMIC), 2011 European

Conference_Location

Manchester

Print_ISBN

978-1-61284-236-3

Type

conf

Filename

6102873