A Two-Pole Lumped-Element Programmable Filter With MEMS Pseudodigital Capacitor Banks

Author

Palego, Cristiano ; Pothier, Arnaud ; Crunteanu, Aurelian ; Chatras, Matthieu ; Blondy, Pierre ; Champeaux, Corinne ; Tristant, Pascal ; Catherinot, Alain

Author_Institution

Univ. of Limoges, Limoges

Volume

56

Issue

3

fYear

2008

fDate

3/1/2008 12:00:00 AM

Firstpage

729

Lastpage

735

Abstract

This paper presents a novel two-pole reconfigurable bandpass filter on alumina substrate for applications in X- and S-bands. An analytical approach was followed for synthesis of multiple filtering characteristics. A microstrip network on alumina was then optimized to implement a set of switched filtering functions. Finally a reconfigurable filter was fabricated and tested in order to validate the proposed approach. This filter exploits five 3-bit capacitor banks controlled with microelectromechanical systems ohmic switches to achieve 12 states with 37.5% tuning range between 1.51-2.26 GHz. Several tuning mechanisms are demonstrated including frequency, bandwidth tuning, and frequency + bandwidth tuning. Good agreement with theoretical results has been obtained.

Keywords

UHF filters; channel bank filters; circuit tuning; lumped parameter networks; micromechanical devices; MEMS pseudodigital capacitor banks; S-bands; X-bands; alumina substrate; bandwidth tuning; frequency 1.51 GHz to 2.26 GHz; frequency tuning; microelectromechanical systems ohmic switches; microstrip network; switched filtering functions; two-pole lumped-element programmable filter; two-pole reconfigurable bandpass filter; Filters; RF microelectromechanical systems (MEMS); tunable filters;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2008.916873

Filename

4453834