In this paper, we describe the possibility of establishing the effect of electromagnetic drag on the microwave range. We are conducting an initial study of the use of this effect for novel fluid flow sensors designing. Two different experimental stands on circular and rectangular waveguides are considered. The study is carried out using a vector network analyzer at frequencies of 8-12 GHz (X-band). Distilled water is used as a moving medium. The experiment is optimized on the basic parameters (including the temperature of the liquid) to obtain the maximum magnitude of the target observation effect. As an optimization criterion, the difference of the arrival phase of two coherent waves propagating in identical media is used, one of which has a translational motion, and the second is at rest. In conclusion, findings are presented describing the main optimization results. The principle of detecting the effect of drag on guided waves in the transmission lines is set. As a sensor test experiment, a scheme using a signal analyzer is provided.