The Influence of Radiation Distance on Microwave Coupling Efficiency in Microwave-assisted Rock Breakage

High power microwave early irradiation has a great potential in assisting excavators in breaking hard and abrasive rocks, radiation efficiency is a very important issue. The paper studied the radiation of standard rectangular waveguides on rocks at different working distances, obtained the minimum S
11
parameter through CST simulation, and determined the corresponding optimal radiation position, at a working distance of 0.31λ, the S
11
is minimum, which is the optimal position of the sample relative to the microwave antenna. Using this method, we can quickly and accurately obtain the efficiency of microwave coupling into rocks, can guide practical engineering applications.