In this letter, a dielectric resonator antenna (DRA) with an engraved groove and a comb-like metal wall for beamwidth enhancement in both E- and H-planes is proposed. First, with an engraved groove, the radiation intensity on the top wall of the rectangular DRA can be enhanced, which significantly broadens the half-power beamwidth (HPBW) in the E-plane. Second, by placing a regular notched metal wall around the grooved DRA, HPBWs in both E- and H-planes can be greatly widened simultaneously. Finally, for the further improvement of HPBW in the H-plane, the regular notched wall is replaced by a 3-D printed comb-like metal wall. Vertical currents can be induced on the comb-like wall due to the coupling of the DRA, which can increase gain at low elevation angles and further enhance HPBW of 20°. Thus, HPBWs of the proposed antenna in both cutting planes can be improved step by step without scarifying each other and bandwidth. To verify the proposed design, an antenna prototype is fabricated and measured, which shows an impedance bandwidth of 38.2% (2.58–3.8 GHz), with excellent HPBW performance of 248° and 148° in the E- and H-planes, respectively.

中文翻译：

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DRA带有刻槽和梳状金属壁，可增强E和H平面的波束宽度

在这封信中，提出了一种带有刻槽和梳状金属壁的电介质谐振器天线（DRA），用于在E和H平面上增加波束宽度。首先，通过刻槽，可以增强矩形DRA顶壁上的辐射强度，从而显着拓宽E平面中的半功率波束宽度（HPBW）。其次，通过在带槽的DRA周围放置规则的带槽金属壁，可以同时大大扩展E和H平面中的HPBW。最后，为了进一步改善H平面中的HPBW，用3D打印的梳状金属壁代替规则的缺口壁。由于DRA的耦合，会在梳状壁上感应出垂直电流，这会增加低仰角时的增益并进一步增强20°的HPBW。因此，可以逐步改善两个切割平面中拟议天线的HPBW，而不会相互影响和带宽。为了验证所提出的设计，制造并测量了天线原型，该天线原型显示出38.2％（2.58–3.8 GHz）的阻抗带宽，在E和H平面分别具有248°和148°的出色HPBW性能。