Overmoded relativistic backward wave oscillators cannot preserve output mode purity, generating a number of TM0nmodes in general. Until now, terminations for high power microwave (HPM) devices are only matched to a single operating mode. It is quite difficult to properly radiate a combination of TM0nmodes using HPM antennas. In this paper, a novel efficient TM0n-TEM-mode converter is proposed. With the method of power dividing and field matching described, a mixture of TM01, TM02, and TM03modes generated by an HPM device can be successfully converted into a pure coaxial circular waveguide TEM mode utilizing the outer and inner coaxial waveguide structure with an efficiency of over 99% at the center frequency. Such a mode transition will greatly improve the radiation efficiency of HPM antennas.
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Peng et al. (2016) studied this question.
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