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:
Mar. 15, 1977
Filed:
Nov. 04, 1975
Applicant:
Inventor:
Julien Prevot, Paris Cedex, FR;
Assignee:
Societe Lignes Telegraphiques et Telephoniques, Paris, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ; H01P / ; H01P / ;
U.S. Cl.
CPC ...
333 / ; 328167 ; 333 / ; 333 / ; 333 / ; 333 / ;
Abstract
An active resonant circuit to be used as a cell for a low insertion loss high level microwave filter is disclosed comprising a circuit tuned at f.sub.o inductively coupled with a negative resistance amplifier consisting of a transistor with a cut-off frequency high with respect to f.sub.o , an emitter circuit coupled to said tuned circuit, with a high transformer ratio, an adjustable tuned circuit in the base of said transistor and means for biassing said transistor for maximum negative resistance at f.sub.o . Two or more cells may be associated to constitute a filter.