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. 04, 2008
Filed:
Jun. 27, 2006
Ping LI, Dunstable, MA (US);
Ping Li, Dunstable, MA (US);
Analog Devices, Inc., Norwood, MA (US);
Abstract
A power detection system implemented using a pair of directional couplers and a transmission line (or equivalent) disposed between the directional couplers, wherein the transmission line (or equivalent) provides a 90° phase shift between the directional couplers. Accurate power detection is provided by combining the powers detected at each of the directional couplers, whereby the combined power is independent of load phase. The total power in the forward case is given by P=2*P*C, where Pis the forward power and C is the coupling coefficient the directional couplers. The total power in the reflected case is given by P=2*P*C*(ρ+D), where Pis the forward power, C is the coupling coefficient of said directional couplers, ρ is the reflection coefficient, and D is the directivity of the directional couplers.