A Novel Concept of TE₂₀-Mode 90° Waveguide Twist With Mode Filtering Characteristics

Le résumé fourni par la source

We present a novel TE$_{\text{20}}$-mode 90$^{\circ}$waveguide twist concept for millimeter-wave (mm-wave) and terahertz (THz) applications. This waveguide twist has the unique characteristic of mode filtering; that is, only the desired TE$_{\text{20}}$mode can be rotated and output, the fundamental TE$_{\text{10}}$mode, and higher order modes will be reflected. In the design, the input/output (I/O) channels are orthogonal oversized waveguides, the TE$_{\text{20}}$mode is converted into a cross-waveguide (cross-WG) with gradually changed arm lengths. Broad bandwidth (BW) and high efficiency can be easily achieved in a compact size. To verify the proposed concept, two 160–270-GHz prototypes based on rectangular waveguides (RWGs) and groove gap waveguides (GGWs) were designed, fabricated, and measured. The RWG-based prototype was milled in one metal block, while the GGW-based one was fabricated in two metal split blocks. The measured results reveal that the two prototypes achieve average insertion losses of 0.21 and 0.36 dB for the interested TE$_{\text{20}}$mode, and minimum suppressions of 45 and 35 dB for the unwanted TE$_{\text{10}}$mode over the desired frequency band. The features of polarization rotation and mode filtering make the proposed TE$_{\text{20}}$-mode waveguide twist be a candidate for compact, broadband, and efficient waveguide systems.

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