| 摘要 |
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<SUB>c1</SUB>=2*P<SUB>f</SUB>*C, where P<SUB>f </SUB>is the forward power and C is the coupling coefficient the directional couplers. The total power in the reflected case is given by P<SUB>c1</SUB>=2*P<SUB>f</SUB>*C*(rho<SUP>2</SUP>+D<SUP>2</SUP>), where P<SUB>f </SUB>is the forward power, C is the coupling coefficient of said directional couplers, rho is the reflection coefficient, and D is the directivity of the directional couplers.
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