A singly fed wideband circularly polarized (CP) substrate-integrated dielectric resonator antenna (SIDRA) is proposed for millimeter-wave (mm-wave) applications. The SIDRA consists of an inner cylindrical dielectric resonator (DR), an outer ring DR, and a substrate-integrated waveguide (SIW) cavity. To generate CP fields, a cross-slot formed by two rectangular slots with different lengths is utilized to feed the DRA at its bottom. It has been found that owing to the embedded structure, the fundamental HEM $_{11\delta }$ mode of the inner DR and the higher order HEM $_{12\delta +1}$ mode of the entire DR can be excited simultaneously, at adjacent frequencies. Moreover, owing to the different loading effects of the two feeding slots, the resonance frequencies of the nearly degenerate DR modes excited by the two slots are slightly different from each other. The two nearly degenerate modes lead to the wide impedance and axial ratio (AR) bandwidths of 34.6% and ~30%, respectively. In addition, due to the surrounding SIW cavity, the directivity of the antenna is greatly improved as compared with that of the isolated counterpart, with the maximum gain given by 8.15 dBic.

中文翻译：

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用于毫米波应用的宽带圆极化基板集成嵌入式介质谐振器天线

单馈宽带圆极化 (CP) 衬底集成介质谐振器天线 (SIDRA) 被提议用于毫米波 (mm-wave) 应用。SIDRA 由内部圆柱形介质谐振器 (DR)、外环 DR 和衬底集成波导 (SIW) 腔组成。为了产生 CP 场，由两个不同长度的矩形槽形成的交叉槽用于在其底部馈送 DRA。已经发现，由于嵌入结构，基本的 HEM $_{11\delta }$ 内部 DR 和高阶 HEM 的模式 $_{12\delta +1}$ 可以在相邻频率上同时激发整个 DR 的模态。此外，由于两个馈电槽的负载效应不同，两个槽激发的近简并DR模式的共振频率略有不同。这两种近乎简并的模式导致阻抗和轴比 (AR) 带宽分别为 34.6% 和 ~30%。此外，由于周围的SIW腔，天线的方向性与隔离对应物相比有很大改善，最大增益为8.15 dBic。