Patent ID: 9287846
Filing Date: 2016-03-15
CPC Classification: H01P,H03H

Claim Text:
1. A high-frequency phase shifter operative to vary a phase between a high-frequency input signal and an output signal by transmission phase Φ, comprising a two-port network having an input and an output and which, with respect to high-frequency properties of the two-port network, comprises three two-terminal networks having low-loss reactances, wherein at least one of the three two-terminal networks is arranged in a series circuit as a two-terminal network in series with one of the input or output and at least one of the three two-terminal networks is arranged in a parallel circuit as a two-terminal network in parallel with an earth terminal of the two-port network, so that a T circuit or a π circuit is provided, wherein each two-terminal network in series comprises a respective identical fixed inductance connected in series with a respective identical series capacitance element having an electrically identical capacitance value, each two-terminal network in parallel includes a respective identical fixed inductance connected in parallel with a respective identical parallel capacitance element having an electrically identical capacitance value, and all capacitance elements in the two-port network are adjusted in their respective capacitance values by the same tuning voltage U for variation of the transmission phase Φ of the two-port network, wherein each of the at least one series capacitance element and the at least one parallel capacitance element of the three two-terminal networks includes at least one variable-capacitance diode, and depending on the tuning voltage U—apart from the technical variance between the variable-capacitance diodes—the same capacitance value C(U) for each of the capacitance elements is set.