The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 04, 1978
Filed:
Oct. 12, 1976
Jean Michel Autran, Paris, FR;
Bernard Epsztein, Paris, FR;
Thomson-CSF, Paris, FR;
Abstract
An input transducer for a surface wave filter with a transfer function T(F) the inverse Fourier transform of which is a function I(t) having maxima the amplitude of which vary within wide limits; such an input transducer comprises at least two elemental transducers of which one has a pulse response comprising the high-amplitude maxima of I(t), while the other(s) has/have a pulse response comprising maxima equal to n times the low-amplitude maxima of I(t); the first is fed by the signal to be filtered; the other(s) is/are fed by a signal equal to 1/n of the signal to be filtered. Such a transducer arranged at one end of a piezoelectric substrate of which the other end comprises a wide-band output transducer, provides for the construction of high quality filters.