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:
Jul. 28, 1981
Filed:
Jun. 22, 1979
Applicant:
Inventors:
William H Childs, Gaithersburg, MD (US);
Christoph E Mahle, Washington, DC (US);
Assignee:
Communications Satellite Corporation, Washington, DC (US);
Primary Examiner:
Int. Cl.
CPC ...
H04L / ;
U.S. Cl.
CPC ...
329105 ; 329112 ; 329116 ; 329137 ; 329204 ; 333116 ; 375 84 ; 455327 ;
Abstract
A microwave integrated circuit (MIC) quadrature phase shift keying (QPSK) demodulator uses a novel arrangement of couplers to permit the IF ports to be adjacent one another so that, in mixer applications, it is unnecessary for the circuitry to leave the plane of the MIC. A symmetrical arrangement of the MIC ensures near-perfect phase orthogonality of the RF.sub.2 split and the power/phase identity of the RF.sub.1 split.