The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, we present the design, fabrication and characterization of the first tunable bandpass filter that combines split ring resonators (SRRs) and vanadium dioxide (VO2)-based microwave switches. The device consists on a pair of coupled SRRs, feed by means of tapped microstrip lines, that can be connected to metallic patches by electronically activating the VO2-based switches. Through the...
This paper presents the effects of residual charging in dielectric less actuators of RF-MEMS ohmic switches. Indeed, in order to strongly reduce component sensitivity to charging, a dielectric less electrostatic actuator has been introduced in a conventional DC contact series MEMS relay design, resulting both in strong improvement in reliability and preservation of its intrinsic RF performance. Under...
The influence of atmosphere on capacitive RF-MEMS switches is studied. It is shown that ambient atmosphere not only induces an incremental effect on the degradation of MEMS switches but also completely changes the charging mechanism of the dielectrics, directly linked with RF-MEMS reliability behaviour of MEMS switches reliability. Operating RF-MEMS switches in a dry environment changes the mechanism...
We present the practical realization of microwave switches (both in series or shunt configurations) based on reversible metal-semiconductor transitions exhibited by vanadium dioxide (VO2) material. This transition (thermally or electrically initiated) is used to switch on and off a microwave signal propagating in a microwave coplanar waveguide incorporating a thin VO2 film. The realised devices may...
This paper presents recent results on the development of high power MEMS switched varactors. Design methodology as well as fabrication and measurement results are presented. The MEMS varactors are made of a thick metal gold cantilever, with a reduced contact area, that allows to control high power microwave signals. Operation up to 5 watts CW is demonstrated, with good reliability. First results on...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.