In this letter, a wideband coaxial to air-filled waveguide transition is proposed, which has been realized by the substrate integrated waveguide (SIW) technology. The present design incorporates several air-filled vias of varying hole diameter to efficiently match the impedance over a wide operating bandwidth in the dominant TE10 mode, hence replacing the need for dielectric taper or larger footprint. A transition prototype has been designed and tested to validate the results. The measured return loss is better than 15 dB and insertion loss of 1 ± 0.1 dB over the band of interest (9.5–15 GHz), hence portraying a near-octave bandwidth from the proposed design.

中文翻译：

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具有近倍频程带宽的同轴到充气基板集成波导过渡


在这封信中，提出了一种宽带同轴到充气波导的过渡，该过渡已通过基板集成波导（SIW）技术实现。目前的设计采用了多个不同孔径的空气填充通孔，可在主要 TE10 模式下的宽工作带宽上有效匹配阻抗，从而取代了对电介质锥度或更大占位面积的需求。已经设计并测试了过渡原型以验证结果。在感兴趣的频段 (9.5–15 GHz) 上，测得的回波损耗优于 15 dB，插入损耗优于 1 ± 0.1 dB，因此，所提出的设计呈现出接近倍频程的带宽。