In this paper, we report the design methods and numerical results for a kind of high-power microwave (HPM) circular-waveguide transmission line, which has a 90deg bend to change the wave propagating direction for certain purposes and, meanwhile, also acts as a TM01-TE01converter, transforming the HPM sources generating TM01mode into the TE01mode. Two types of mode-conversion sequences, i.e., TM01-TM11-TE01and TM01-TE11-TM11-TE01, are proposed. In both sequences, a 90deg-bend TM11-TE01mode converter with sinusoidal curvature is adopted. Besides, in the first sequence, a new configuration of serpentine TM01-TM11converter is proposed, which provides high conversion efficiency with short length; in the second one, compact linear TM01-TE11and TE11-TM11converters are designed. These two types of transmission lines have similar transmission efficiencies of 98.2% and 98.6% (ohmic attenuation in Cu waveguides is included), respectively, at 3.5 GHz, with bandwidths (for mode-conversion efficiency >90%) of 6.0% and 5.7%, respectively.
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Yuan et al. (2009) studied this question.
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