Direct-Reading Swept-Frequency Slotted-Line System with Slope Correction

Many broad-band devices unfortunately exhibit voltage standing wave ratio (VSWR) spikes within narrow frequency bands, and such devices should be tested continuously over the whole frequency range to identify the spikes. The time required for testing is important and a direct-reading display, or record, is a major convenience. The system described uses a swept-frequency slotted-line technique to give a direct-reading record of VSWR over the frequency range 2-18 GHz within 30 s, without degrading the accuracy of the technique.