The concept of compact waveguide window based on the low-loss cyclic olefin copolymer (COC) is proposed in this letter, which considers the characteristics of broadband performance, transparency, sufficient mechanical strength, and simple mechanical process, by simply integrating the machined bipyramids-type COC dielectrics into the modified waveguide. To verify our idea, two waveguide windows consisting of internal dielectrics and external fixtures are designed and fabricated. The two types of waveguide windows are measured along with two strain rectangular waveguides at the Ka-band with the return loss better than 18.5 dB over the related frequency range of 42.8% and better than 20 dB over the related frequency range of 49%, respectively. The measured results show the advantages of the proposed concept, which is an excellent candidate for broadband application at a millimeter-wave frequency or higher.

中文翻译：

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基于低损耗环烯烃共聚物的紧凑型宽带透明波导窗口

在这封信中提出了基于低损耗环烯烃共聚物（COC）的紧凑波导窗口的概念，它考虑了宽带性能、透明性、足够的机械强度和机械工艺简单的特点，通过简单地集成加工的双锥-将 COC 电介质输入到改进的波导中。为了验证我们的想法，设计并制造了两个由内部电介质和外部夹具组成的波导窗口。两种类型的波导窗口与两个在 Ka 波段的应变矩形波导一起测量，回波损耗分别在 42.8% 的相关频率范围内优于 18.5 dB 和在相关频率范围 49% 内优于 20 dB . 测量结果显示了所提出概念的优点，