Broadband, High Gain, Narrow Width Rectangular Dielectric Resonator Antenna with Air Gap

The broadband, narrow width, rectangular dielectric resonator antenna(RDRA) of aluminum nitride(εr=8.6) was designed and the effect of inclusion of air gap at the bottom of the dielectric resonator antenna(DRA),above the ground plane, was investigated. Gain around 7 dBi was obtained for DRA with air gap(DRAAG) over a broad bandwidth in upper X, Ku, and K bands. Further enhancement in gain could be obtained by placing a metal wall parallel to the length of DRA. However, due to the presence of metal wall, bandwidth was reduced. These structures with the metal wall are capable of operating over a wide band extending from Ku band to lower K band with the gain of around 10 dBi. CST Microwave Studio Software was used to simulate all these structures.Performance parameters of DRA with air gap were compared with several broadband DRA structures reported in recent literature. The proposed DRAAG with the metal wall in this paper is capable of operating over a wide bandwidth along with a significant gain.

X波段高增益圆柱形介质谐振器天线的设计

基于新型(1-x)Zn_(2)SiO_(4)-xLi_(2)TiO_(3)微波介质陶瓷材料,设计了一种工作在X波段的圆柱形介质谐振器天线(DRA)。该天线采用微带-缝隙耦合方式进行馈电,通过增加矩形环状缝隙产生新谐振点的方法增加阻抗带宽,将微带线枝节改为T字形调节阻抗匹配。仿真结果显示,在工作频段10.34~11.18 GHz范围内,阻抗带宽为820 MHz,频带内驻波比(VSWR)小于2,带内平均增益大于8.62 dBi,最高增益可达10.73 dBi,天线方向性良好。天线的整体性能优异且结构简单,可应用在广播卫星、地球探测卫星、气象卫星等领域。