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. 08, 2013
Filed:
Nov. 30, 2011
Applicants:
William G. Trueheart, Sewell, NJ (US);
Brandon R. Davis, Mount Laurel, NJ (US);
Inventors:
William G. Trueheart, Sewell, NJ (US);
Brandon R. Davis, Mount Laurel, NJ (US);
Assignee:
Lockheed Martin Corporation, Bethesda, MD (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03H 11/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A phase shifter comprises a differential quadrature all-pass filter (QAF) including a balanced input port and two balanced output ports. A quadrature phase shift is manifested between the balanced output ports. The phase shifter also comprises a resistance-capacitance polyphase filter (PPF) section defining two balanced input ports and two balanced output ports. The balanced input ports of the PPF are coupled to the balanced output ports of the QAF. The combination exhibits broad bandwidth and relatively low ohmic loss.