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:
Aug. 18, 1981
Filed:
Dec. 21, 1979
Applicant:
Inventor:
Ronald J Wanat, Elgin, IL (US);
Assignee:
Motorola, Inc., Schaumburg, IL (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H01P / ; H01P / ;
U.S. Cl.
CPC ...
333202 ; 333222 ;
Abstract
A helical resonator filter with increased bandwidth is provided for use as a wideband bandpass filter. The device is composed of a series of helical resonators cells cascaded with non-uniform cell spacing, thus providing an increase in coupling coefficients between cells. The increased bandwidth is thereby obtained without placing a burden on the exterior housing dimensions relative to a normally spaced narrow bandwidth filter and without substantially reducing the unloaded Q's or increasing insertion losses.