In this study, a broadband and high gain dielectric-rod end-fire antenna are proposed for applications on both the K and Ka bands. By employing the double-ridged waveguide (DRW) feeding structure which is composed of a coaxial line to tapered DRW transition, a parabolic tapered DRW, and a parabolic-tapered flared parallel waveguide section, the impedance bandwidth of this proposed antenna is broadened to 84.5%. The dielectric-rod with the double circular truncated cone structure acted as the main radiator of the proposed antenna is adopted to achieve higher gains and lower side-lobe levels as compared to the traditional circular cone dielectric-rod, while the four-wedges structure inserted in the waveguide is developed as the matching section of the dielectric-rod to further improve the impedance matching. The measured results show that this antenna can be operated in 17.9–44.1 GHz, and the measured gain changes from 9.9 to 15.5 dBi. Moreover, the radiation patterns are demonstrated with observed end-fire characteristic in the overall operating band.

中文翻译：

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锥形脊形波导馈电的宽带和高增益电介质棒端射天线，用于K / Ka频段应用

在这项研究中，提出了一种宽带和高增益电介质棒端射天线，用于K和Ka频段。通过采用由同轴线到锥形DRW过渡，抛物线锥形DRW和抛物线锥形喇叭形平行波导段组成的双脊波导（DRW）馈电结构，该天线的阻抗带宽扩展到84.5。 ％。与传统的圆锥电介质杆相比，采用具有双圆截锥结构的电介质棒作为拟议天线的主要辐射体，以实现更高的增益和更低的旁瓣电平，而插入了四楔结构波导中的阻抗被开发为电介质棒的匹配部分，以进一步改善阻抗匹配。测量结果表明，该天线可以在17.9–44.1 GHz的频率下工作，并且测量的增益从9.9 dBi变为15.5 dBi。此外，在整个工作范围内，观察到的辐射图案具有观察到的端射特性。