Conception de circuits reconfigurables à base de MEMS RF

Soutenue le 26 mars 2009Thèse Université de Limoge

Conception de circuits reconfigurables à base de MEMS RF

This work presents the conception of reconfigurable circuits based on MEMS RF with strong quality factors and multifunction in microstrip technologies. This type of circuits requires a rather long time of simulation and large simulator memory. Therefore, we developed a method of hybrid simulation so as to find a response to these shortcomings. We conceived a non-linear electromechanic model for the used MEMS, in order to simulate the intermodulation of the Tchebychev filter that was made. Then, we present the steps followed to conceive and optimize a metamaterial circuit base on MEMS RF varactors. Finally, a metamaterial circuit with 149 multifunction varactors is conceived and optimized.LIMOGES-BU Sciences (870852109) / SudocSudocFranceF

A 2-pole digitally tunable filter using local one bit varactors.

International audienc

Concept and Manufacturing of a 2-Pole Digitally Tunable Filter Based on RF MEMS Varactors

International audienceThis paper presents the design of tunable filters based on capacitive RF MEMS switched loads appropriately distributed along an hairpin resonator. The capacitive load distribution is computed using hybrid circuit EM simulation and allows precise computation of the frequency shift for every location of the switched load. To prove the concept, a two pole filter has been fabricated on a 525 μm-thick quartz substrate and it occupies a total area of 1x0.85 cm2. Its center frequency can be discretely tuned using 2 capacitive switches from 9.8 to 11 GHz with 4 positions. Return losses less than 15 dB and insertion losses better than 2.5 dB have been measured over the whole operation band

Design of a 2-pole digitally tunable RF MEMS Filter based on a hybrid simulation approach.

International audienc

Conception de filtres accordables à fort coefficient de qualité par intégration de varactors MEMS RF pour des applications spatiales.

Session Poster : 4

New approach for the treatement of FBRLS algorithm with long impulse response

International audienc

Design of a Flexible Metamaterial RF MEMS Circuit for Multi-Purpose/a Tunable Bass-Band Filter

International audienceThis paper represents a new and original design of a Metamaterial circuit based on matrix of resonator cells using variable analog MEMS capacitors 'varactors', periodically distributed in some way to fulfill a multiple applications circuit, whose one is a tunable pass band-filter. The cells are connected together with lumped elements computed using hybrid circuit EM simulation and allow precise computation of the frequency shift for every changing of the capacitive load. The design is extremely dynamic and can be used for numerous applications due to the agility in controlling the varactors. Those later, are actuated in some manner to achieve a tunable 2-pole pass-band filter, its center frequency is analogically and then digitally tuned from 11 to 12.6 GHz. Return losses less than 15 dB and insertion losses better than 1 dB over the whole operation band. The circuit has been conceived on a 525 µm-thick quartz substrate and it occupies a total area of 1.48x0.79 cm². Finally, we discuss the challenging and opportunities in the field of Metamaterials based on RF MEMS