Patent ID: 7919969

Claim:
Network analyzer comprising: a signal generator for generating an excitation signal which can be fed via a measuring line to a test object that can be connected to the network analyzer, and a measuring bridge connected by signals to the measuring line and via which a reference signal, which corresponds to the excitation signal, can be decoupled on a reference channel and a measuring signal, which corresponds to a signal returning from the test object, can be decoupled on a measuring channel, the measuring bridge comprising at least one resistive bridge and at least one directional coupler in such a way that the measuring bridge is operated in a lower frequency range as a resistive bridge and in an upper frequency range as a directional coupler, wherein the resistive bridge is connected in series to the directional coupler, a first test-object-side change-over switch is provided on the measuring line to make the returning signal available to either the resistive bridge or the directional coupler and to decouple said returning signal as the measuring signal via a measuring branch of the resistive bridge or via a measuring branch of the directional coupler, the measuring branch, which is formed as a coupling path, precedes the first test-object-side change-over switch in a direction of travel-of the signal returning in the measuring line, the measuring line can be connected by a line connection by a second test-object-side change-over switch to the measuring channel of the measuring bridge to form a through path, and the second test-object-side change-over switch is in line with the measuring branch, and is disposed between the test object and the measuring branch of the directional coupler in the direction of the signal returning in the measuring line.