Abstract
An X-band GW-level polarization controllable TM01-TE11 mode converter for high power microwave (HPM) systems is proposed. The mode converter consists of a TM01-TE10 mode coupler, a TE11-TE10 mode coupler and four phase shifters. The overall axial dimension is less than 300 mm. By controlling the phase shifters, the online adjustment of vertical, horizontal and circular polarizations can be implemented. The simulation demonstrates that the transmission efficiency is higher than 95.6% from 9.4 GHz to 9.8 GHz. The power capacity of the mode converter is on GW-level.
Highlights
The waveguide modes generated by the high power microwave (HPM) sources are usually axisymmetric TM01 mode.[1]
It consists of three parts: 1) a circular waveguide TM01 to rectangular waveguide TE10 mode coupler; 2) a circular waveguide TE11 to rectangular waveguide TE10 mode coupler; 3) four rectangular waveguide TE10 mode phase shifters
When the circular waveguide port of the TM01-TE10 mode coupler is excited with the TM01 mode microwave, the TE10 modes with equal amplitudes and equal phases are output at the four rectangular waveguides
Summary
The waveguide modes generated by the HPM sources are usually axisymmetric TM01 mode.[1]. To ensure high transmission efficiency, their axial dimensions are large and exceed 700mm at X-band.[2] If overmoded ratio of the circular waveguide become larger, the dimensions will be several meters. The polarization of the converter output mode is fixed. For extension of practical application of HPM system, the length of the mode converter should be further shortened. The online adjustment of vertical, horizontal and circular polarizations are required. A novel X-band high power TM01-TE11 mode converter is proposed. When the waveguide phase shifters are controlled under different phase conditions, the polarization adjustment can be realized
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