Method for measuring a characteristic impedance and a propagation constant of a two-port network

Claim 2

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; and for measuring the characteristic impedance and the propagation constant of a line, the terminations of the two-port network are measured by themselves, wherein said network is exclusively a line and said terminations comprise connecting plugs and a short section of the line.

Claim 3

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; for measuring the characteristic impedance and the propagation constant of a line, the terminations of the two-port network are measured by themselves, wherein said network is exclusively a line and said terminations comprise connecting plugs and a short section of the line; and wherein, for measuring the terminations separately: a short line having given connecting plugs is connected to the reflection measuring instrument; successively at least two finite impedances are connected to the short line, in each case an actual termination impedance being measured; and wherein, for measuring the input impedances: the short line is replaced by a long line having the same connection plugs and in each case an input impedance is measured for the at least two finite impedances.

Claim 4

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; for measuring the characteristic impedance and the propagation constant of a line, the terminations of the two-port network are measured by themselves, wherein said network is exclusively a line and said terminations comprise connecting plugs and a short section of the line; and wherein, for measuring the terminations separately: a short line having given connecting plugs is connected to the reflection measuring instrument; successively at least two finite impedances are connected to the short line, in each case an actual termination impedance being measured; and wherein, for measuring the input impedances: the short line is replaced by a long line having the same connection plugs and in each case an input impedance is measured for the at least two finite impedances.

Claim 5

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; and for measuring the characteristic impedance and the propagation constant of an absorber medium, the terminations of the two-port network are measured by themselves, wherein said terminations comprise parallel line wires and said network is the absorber medium surrounding the parallel line wires.

Claim 6

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; and for measuring the characteristic impedance and the propagation constant of an absorber medium, the terminations of the two-port network are measured by themselves, wherein said terminations comprise parallel line wires and said network is the absorber medium surrounding the parallel line wires.

Claim 7

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; for measuring the characteristic impedance and the propagation constant of an absorber medium, the terminations of the two-port network are measured by themselves, wherein said terminations comprise parallel line wires and said network is the absorber medium surrounding the parallel line wires; and wherein, for measuring the terminations: two parallel line wires having given connecting plugs are connected to the reflection measuring instrument; successively at least two finite impedances are connected to the parallel line wires, in each case an actual termination impedance being measured; and wherein, for measuring the input impedances: the parallel line wires are placed in an absorber medium and in each case an input impedance is measured for the at least two finite impedances.

Claim 8

Method for measuring a characteristic impedance and a propagation constant of a two-port network, which method comprises the steps of: measuring at least two input impedances ZE1, ZE2 by means of a reflection measuring instrument at an input port of the two-port network with at least two different terminations of an output port of the two-port network; and determining from the at least two input impedances ZE1, ZE2 the characteristic impedance ZW and the propagation constant g; wherein: known finite impedances, which are independent of the two-port network, are used as terminations of the output port; for measuring the characteristic impedance and the propagation constant of an absorber medium, the terminations of the two-port network are measured by themselves, wherein said terminations comprise parallel line wires and said network is the absorber medium surrounding the parallel line wires; and wherein, for measuring the terminations: two parallel line wires having given connecting plugs are connected to the reflection measuring instrument; successively at least two finite impedances are connected to the parallel line wires, in each case an actual termination impedance being measured; and wherein, for measuring the input impedances: the parallel line wires are placed in an absorber medium and in each case an input impedance is measured for the at least two finite impedances.

Claim 9

Method as claimed in claims 1, 2, 3 or 4, wherein for determining the characteristic impedance ZW and the propagation constant g from the measured input impedances, two relations of the following type are used: ##EQU4## where ZA1=finite impedance for the first input impedance ZE1 ZA2=finite impedance for the second input impedance ZE2 L=length of the two-port network ln=natural logarithm.

Claim 10

Method as claimed in claim 5, wherein: at least three input impedances are measured with at least three different predetermined terminations; from two input impedances each in each case a preliminary characteristic impedance and a preliminary propagation constant, respectively, are determined; and a final characteristic impedance and a final propagation constant, respectively, are obtained by averaging the preliminary characteristic impedances and preliminary propagation constants, respectively.