Modelling of resistive sensor for high-power microwave pulse measurement of te01 wave in circular waveguide

The interaction of a semiconductor plate with TE₀₁ (H₀₁) wave in a circular waveguide has been investigated. A plate with contacts on its top and bottom serves as a sensing element (SE) for a resistive sensor (RS) based on the electron heating effect and devoted to high-power microwave pulse measurement. A three-dimensional finite-difference time-domain method was applied to simulate wave propagation within a circular waveguide segment with the SE placed on a wall of the waveguide. The electric field distribution, voltage standing wave ratio and the average electric field dependencies on frequency have been determined for several sets of dimensions and specific resistances of the SE. The influence of the resonance phenomena on the average electric field in the SE has been considered. As a result of our investigation, the optimal dimensions and specific resistance of the SE required to provide a flat frequency response of the RS were found.