Matra

About: Matra is a based out in . It is known for research contribution in the topics: Signal & Detector. The organization has 1330 authors who have published 1216 publications receiving 17967 citations.

Mounting of electronic microcomponents on a support

Abstract: For flat mounting of electronic microcomponents, such as chip carriers, on a printed circuit support, the electrical contacts of the microcomponent are connected to pads on the printed circuit, microcomponents having solderable contacts on a lower face thereof, comprising electrically connecting said solderable contacts of the microcomponent to respective pads on the printed circuit through sections of flexible wires having a sufficient degree of curvature for mechanically uncoupling said microcomponents from said printed circuit support and mechanically connecting the microcomponent to the support through a spacer having planar dimensions lower than planar dimensions of a base of said microcomponent for providing access to said contacts for connecting said sections thereto. An intermediate product includes the chip carrier and a grid conencted to the lower face thereof, including connecting sections and an edge strip connecting the external ends of all sections.

Spark resistant structure, in particular for aircraft

Abstract: Spark-resistant structure for use with aircraft, including a sheet-shaped external element made of a composite material with an exterior face bearing an electrically conducting surface layer for dissipating lightning energy. The external element also has an interior face. The structure further includes a sheet-shaped internal element with exterior and interior faces. The interior face of the external element is least partially superimposed on the exterior face of said internal element. Each element has holes which are aligned with each other. The structure also includes a fixing structure for holding the elements together in a fixed position passing through the aligned holes and forming an alignment. The fixing structure electrically contacts the conducting surface layer. Additionally, a first electrically conducting strip is positioned under the conducting surface layer of the external element, and it extends longitudinally in a direction of the alignment of the fixing structure. Moreover, the fixing structure passes through and makes an electrical contact with the first electrically conducting strip. The electrical contact between the fixing structure, as well as the electrical contact between the conducting surface layer and the conducting strip are both obtained by electrically conducting paste introduced into the holes in the external element.

Transmission method for CDMA radiotelephone communications, and apparatuses for implementing such method

Abstract: A base station constructs CDMA channels, each defined by a respective spreading sequence which modulates information bits to be transmitted for forming a respective channel signal. The different channel signals are combined, and then modulated on a carrier frequency, so as to produce a phase shift keyed radio signal which is transmitted towards mobile stations. Each spreading sequence has only one real component. For producing the radio signal, a relative phase shift is applied between different channel signals.

Study of basic mechanisms induced by an ionizing particle on simple structures

Abstract: The currents induced by an ionizing particle in a diode and a bar are compared. A short track, located within the structure, and a long track passing through it are considered. Analysis of the mechanisms involved is proposed to explain why the observed effects are approximately the same.