基于TM_(50)模的高增益贴片天线

High-gain patch antenna based on TM_(50) mode

本文提出了一个基于TM_(50)模的高增益方形贴片天线.在TM_(50)谐振模式下,天线表面会有2段与辐射边缘相反的电流,通过在天线表面开槽,可使贴片表面的2段反相电流各自形成回路,从而很好地去除TM_(50)模的4个旁瓣.与此同时,由于削弱了反相电流,开槽后的天线是由3段同相电流叠加而成,这就等同于3个工作于TM_(10)模的天线单元共同作用的效果.通过调节槽型缝隙,天线单元最大增益可达到13. 3 dB.

In this study,a high-gain square patch antenna based on the TM50 mode is proposed.Owing to the operation of the TM50 mode,there is a pair of reversed-phase currents comparing with the radiating edges on the surface of the antenna.By introducing transverse slots along the central line of the patch,each of the two reversed-phase currents are interrupted to circulate with little radiation;thus,the four side-lobes of the TM50 mode can be suppressed well.Simultaneously,because the reversed-phase current is weakened,the slotted antenna is superposed by three inphase currents,which providean effect equivalent to that of three antenna elements operating under the TM10 mode.By adjusting the size of the slots,the maximum gain of the antenna can reach 13.3 dB.