Abstract
A novel methodology of mode conversion from rectangular TE10 mode to TE30/TE40/TE50 modes with the same exciting topology is proposed in this article. The proposed mode converter compromises an <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$H$ </tex-math></inline-formula> -plane T-junction power dividing network and a mode exciting structure based on two coupling apertures. One of the most significant highlights of this geometry is that various TE <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$_{m0}$ </tex-math></inline-formula> ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$m = 3, 4, 5, 6, 7, \ldots $ </tex-math></inline-formula> ) high-order modes could be excited just by adjusting the width of the overmoded output waveguide. Terahertz-band (230–300 GHz) rectangular TE30/TE40/TE50 mode converters were optimized and 1 dB transmission bandwidths of 49.4, 32.5, and 29.0 GHz were obtained, respectively. Within these bandwidths, the port reflections were lower than −15 dB. Two kinds of back-to-back joined rectangular TE30 mode converter prototypes with different cutting planes were fabricated and measured. The measured <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$S$ </tex-math></inline-formula> -parameters are in good agreement with the simulated ones having considered the conductor loss, machining errors, and assembling errors, which verifies the feasibility of the proposed mode conversion methodology.
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