Wave transmission lines and networks – Automatically controlled systems
Patent
1996-05-09
1998-04-28
Gensler, Paul
Wave transmission lines and networks
Automatically controlled systems
324 95, 330279, 330280, 333109, H03H 700
Patent
active
057450161
ABSTRACT:
The invention relates to a directional coupler arrangement and measurement of radio frequency electric power with a directional coupler arrangement, which arrangement comprises a directional coupler, in which a terminal impedance, a detector element and a control circuit are connected between the end of the second conductor element and the earth potential. The impedance value of the terminal impedance can be altered by means of an electric control signal and said control circuit produces said control signal on the basis of the signal provided by the detector element. When the detected power level is low, the control circuit increases the impedance value of the terminal impedance, whereby the peak voltage of the signal applied to one end of the directional coupler increases and the arrangement yields a measurement result that is larger than ordinary, which improves the accuracy and reliability of the arrangement at low power levels.
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Gensler Paul
Nokia Mobile Phones Ltd.
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