基于PRS实现介质谐振器天线增益增强

Gain enhancement of dielectric resonator antenna based on PRS

工作于主模的常规矩形介质谐振器天线(DRA)的增益一般仅为5~6 dBi,针对这一不足,提出了一种加载新型部分反射表面(PRS)的宽频带谐振腔天线。所设计PRS的上表面由4个旋转对称的半圆环贴片组成,下表面则是一个方形孔径贴片。利用这种新结构单元,可以使入射到此表面的电磁波反射时产生正反射相位梯度(通常为负反射相位梯度),从而可以在宽频带内有效实现天线增益增强。仿真结果表明:在9.52~12.48 GHz内馈源天线增益得到提升,最大增幅超过6 dBi。谐振腔天线在匹配带宽内增益平稳,3 dB相对增益带宽为21.1%(11 GHz, 9.84~12.17 GHz)且交叉极化量得到有效抑制。所设计天线可应用于对天线增益有较高要求的通信场景中。

Conventional rectangular dielectric resonator antenna(DRA)working in main mode have a gain of only 5~6 dBi.In order to solve the shortcoming, a wideband resonator antenna loaded with a novel partially reflective surface(PRS)is proposed.The upper surface of PRS is composed of four rotationally symmetric half-ring patches, while the lower surface is a square aperture patch.By using this new structure unit, the electromagnetic wave incident on the surface can be reflected with a regular reflection phase gradient(usually a negative reflection phase gradient),so that the antenna gain-boosting can be effectively achieved in wideband.The simulation results show that the feed antenna gain is improved in 9.52~12.48 GHz, and the maximum increase is more than 6 dBi.The gain of the resonator antenna is stable in the matching bandwidth, and the 3 dB relative gain bandwidth is 21.1 %(11 GHz, 9.84~12.17 GHz).Besides, the cross-polarization is effectively suppressed.The designed antenna can be used in communication scenarios with high requirements for antenna gain.