Directional coupler for a accurate power detection
US7339366B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 27, 2006 |
| Grant date | Mar 4, 2008 |
| Priority date | — |
| Expiry date | Jun 27, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R21/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
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 Pc1=2*Pf*C, where Pf is the forward power and C is the coupling coefficient the directional couplers. The total power in the reflected case is given by Pc1=2*Pf*C*(ρ2+D2), where Pf is 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.