In this paper, a broadband dielectric resonator antenna (DRA) with a simple H‐slot feeding structure is proposed. The broad bandwidth (~45%) and uni‐directional radiation enable this DRA suitable to work as a radiation element in the construction of a beam‐scanning array with not only low frequency sensitivity which is important for accurate angle estimation of in‐coming targets, but also a wide scanning range. Moreover, stable coupling coefficients are established around all the above three resonances with respect to its corresponding feeding line, ensuring a low sidelobe level (SLL) across the whole operating frequency range. In order to realize such a DRA, a latticed rectangular structure is utilized to generate the lower two resonances, while the upper resonance is generated by its H‐shaped feeding slot. The shape of the latticed dielectric resonator is also modified according to a 3‐D printed fixing structure for an accurate installation. A 20‐element beam‐scanning prototype is demonstrated and manufactured. The range of scanning angle is from −36° to +13° within the bandwidth of 10 to 16 GHz, corresponding to a frequency sensitivity of only 122.5 MHz/^o. The achieved SLL are smaller than 19 dB for all scanning beams. The above performance indicates that, this array is very suitable for near‐range radar systems requiring an accurate angle estimation.

中文翻译：

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宽带介质谐振器天线的设计及其在宽扫描角和抑制旁瓣的低灵敏度频率波束扫描阵列中的应用

本文提出了一种具有简单H槽馈电结构的宽带介质谐振器天线（DRA）。宽带宽（〜45％）和单向辐射使该DRA适合用作光束扫描阵列构造中的辐射元件，不仅具有低频灵敏度，这对于准确估计入射目标的角度也很重要，而且扫描范围广。此外，围绕上述三个谐振相对于其相应的馈线，建立了稳定的耦合系数，从而确保了在整个工作频率范围内的低旁瓣电平（SLL）。为了实现这样的DRA，利用格子的矩形结构来产生下部的两个共振，而上部的共振是由其H形进料槽产生的。晶格介电谐振器的形状也根据3D打印固定结构进行了修改，以实现精确安装。演示并制造了20个元素的光束扫描原型。扫描角度范围在10至16 GHz的带宽内为-36°至+ 13°，对应的频率灵敏度仅为122.5 MHz /^Ø。对于所有扫描光束，获得的SLL均小于19 dB。以上性能表明，该阵列非常适合需要精确角度估计的近距离雷达系统。