一种和差波束可重构的微带贴片天线

A Sum-difference Beam Reconfigurable Microstrip Patch Antenna

本文设计了一种工作在TM03模式的单层方形和差波束可重构的开槽微带贴片天线。该天线由同轴探针馈电,没有复杂的和差网络和馈电结构。顶层辐射贴片上三个平行排布的矩形槽用于和波束方向图的旁瓣降低和增益增强。槽两侧的八个金属过孔用于产生差波束。底层金属地上设计了简单的二极管开关控制电路用于实现和波束与差波束的切换。测试结果表明,该和差波束天线的中心工作频率为3.53 GHz,-10 dB阻抗带宽为1.4%,和波束的增益为11.35 dBi,旁瓣电平为-22.9 dB,半功率波束宽度为45°,差波束的增益为9.62 dBi,零深深度为-17.95 dB。本文提出的和差波束可重构微带贴片天线结构紧凑,低剖面、高增益,且具有良好的辐射特性,易于在PCB板上与其他平面电路集成。

A single-layer square slotted microstrip patch antenna working in TM 03 mode with reconfigurable sum-difference beams is designed in this paper.The antenna is fed by a coaxial probe without complex sum-difference network and feed structure.Three parallel-arranged rectangular slots on the top radiation patch are used for sidelobe reduction and gain enhancement of the sum beam pattern.Eight metal vias on both sides of the slot are used to generate the difference beam.A simple diode switch control circuit is designed on the bottom metal floor to realize the switching between the sum beam and the difference beam.The measured results show that the center operating frequency of the sum-difference beam antenna is 3.53 GHz,the impedance bandwidth of-10 dB is 1.4%,the gain of the sum beam is 11.35 dBi,the sidelobe level is-22.9 dB,the half power beamwidth is 45°,the gain of difference beam is 9.62 dBi,and the null depth is-17.95 dB.The proposed sum-difference beam reconfigurable slotted microstrip patch antenna has compact structure,low profile,high gain,good radiation characteristics,and is easy to integrate with other planar circuits on PCB.