An All-metal Cross-slot Multilayer Circular Polarizer Conversion Unit for High-power Microwave Applications

An all-metal Transmit-Array design for circular polarization made by multilayer structure is presented in this paper. By introducing a multilayer cross-slot into a circular waveguide, efficient transmission from right-hand circular polarization to left-hand circular polarization at X-band could be achieved. The working bandwidth can reach 140 MHz when the transmission efficiency is greater than 99%, and phase shift range of 360
^◦
can be achieved. After array formation, beam scanning at an elevation of 21
^◦
was achieved by changing the phase distribution through rotating units, and the hollow beam was converted into a solid beam for outward radiation with enhanced gain, while the side lobe is better than 11.5 dB. The power capacity of single unit is 1.17 MW, namely 3 GW/m
²
, proving its potential−for application in the field of high-power microwave (HPM).