一种Ku波段宽带高功率TEM-TE11模式转换器OA

[Background]In the field of high-power microwave transmission,mode converters are essential components for transforming one waveguide mode into another.However,existing high-power mode converters often face a critical trade-off between broadband operation and compact physical size.Achieving both wideband performance and miniaturization simultaneously remains a significant engineering challenge,especially for applications requiring high efficiency and high-power handling.[Purpose]To overcome this difficulty,this paper proposes a novel broadband high-power TEM-to-TE11 mode converter.The design integrates a broadband waveguide phase shifter with a radial-line waveguide power divider,aiming to deliver both excellent frequency response and a compact longitudinal dimension suitable for modern high-power feeder systems.[Methods]The proposed converter consists of three functional stages.First,a TEM-mode radial-line waveguide power divider splits the input TEM microwave signal from a coaxial waveguide into four identical in-phase rectangular-waveguide TE10 mode signals.Second,a phase-shifting section employs a capacitive-iris-loaded broadband phase shifter to introduce a precise 180-degree phase reversal between symmetrically paired paths.Third,a TE11 radial-line combiner merges the four phase-adjusted microwave signals at the output port,synthesizing a linearly polarized coaxial TE11 mode.[Results]Full-wave simulation results demonstrate that the converter achieves a conversion efficiency exceeding 98%across the frequency band from 13.2 GHz to 15.4 GHz,corresponding to a relative bandwidth greater than 15%.Moreover,the power-handling capability surpasses 200 MW,while the overall longitudinal length is only 1.9 free-space wavelengths at the center frequency.These metrics indicate outstanding performance in terms of both bandwidth and compactness.[Conclusions]The proposed TEM-TE11 mode converter successfully addresses the longstanding conflict between broadband operation and compact size in high-power applications.With its high efficiency,broad bandwidth,substantial power capacity,and minimal axial length,the converter is well suited for integration into current and future high-power transmission feeder systems.