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The main objective of the Wide Field Monitor (WFM) on the LOFT mission is toprovide unambiguous detection of the high-energy sources in a large field ofview, in order to support science operations of the LOFT primary instrument,the LAD. The monitor will also provide by itself a large number of results onthe timing and spectral behaviour of hundreds of galactic compact objects,Active Galactic Nuclei and Gamma-Ray Bursts. The WFM is based on the codedaperture concept where a position sensitive detector records the shadow of amask projected by the celestial sources. The proposed WFM detector plane, basedon Double Sided micro-Strip Silicon Detectors (DSSD), will allow proper2-dimensional recording of the projected shadows. Indeed the positioning of thephoton interaction in the detector with equivalent fine resolution in bothdirections insures the best imaging capability compatible with the allocatedbudgets for this telescope on LOFT. We will describe here the overallconfiguration of this 2D-WFM and the design and characteristics of the DSSDdetector plane including its imaging and spectral performances. We will alsopresent a number of simulated results discussing the advantages that thisconfiguration offers to LOFT. A DSSD-based WFM will in particular reducesignificantly the source confusion experienced by the WFM in crowded regions ofthe sky like the Galactic Center and will in general increase the observatoryscience capability of the mission.

The silicon micro-strip detector plane for the LOFT/Wide Field Monitor