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:
Oct. 17, 1995
Filed:
Jan. 23, 1995
Jesse C James, Huntsville, AL (US);
McDonnell Douglas Corporation, St. Louis, MO (US);
Abstract
An adjustable phase shifter is formed of an RF transmission line having an internal cavity, in which the phase shift produced is determined in part by a mound of flowable dielectric material in the internal cavity. An inlet tube defines a chute for dispensing the dielectric material into the internal cavity and a capped outlet tube connected to a bottom end of the internal cavity defines another gravity chute through which the dielectric material is removed to lower the height of the mound, when the cap is removed from the tube. The electrical length of the phase shifter is increased with addition of dielectric material and decreased with removal thereby varying the effective length of the RF transmission line and the phase shift produced on the RF that propagates therethrough.