小口径弹载遥测系统天线设计

Design of Small-Caliber Shell-Borne Telemetry System Antenna

天线是弹载遥测系统的核心器件。针对小口径弹载遥测系统的特殊需求,开展弹载天线设计。采用圆极化模式消除炮弹飞行过程中自旋对遥测信号的影响;通过扩展天线的波束宽度适应炮弹的曲线弹道;为满足小口径炮弹对天线小尺寸的需求,通过采用高介电常数介质基板并对辐射单元开槽实现天线小型化;天线和弹载遥测系统板卡之间采用插针相连以实现天线的抗过载要求。对所设计的天线进行试制加工,并测得其阻抗带宽为24 MHz,沿轴线±80°内的轴比均小于3 dB,且其顶点处增益为2.18 dBi。测试结果表明此天线的性能够满足实际使用需求。

The antenna is the core component of the shell-borne telemetry system.According to the special needs of small-caliber shell-borne telemetry system,the shell-borne antenna design is carried out.The circular polarization mode is used to eliminate the influence of spin on the telemetry signal during the flight of the shell.Adapt to the curved trajectory of the shell by expanding the beam width of the antenna.In order to meet the needs of small-caliber shells for the small size of the antenna,the antenna is miniaturized by using a high dielectric constant substrate and slotting the radiation unit.The antenna and the shell-borne telemetry system board are connected by pins to achieve the antenna′s overload resistance.The designed antenna is processed and its impedance bandwidth is measured to be[JP3]24 MHz,the axial ratio is less than 3 dB within±80°along the axis,and the gain at its apex is 2.18 dBi.The measured results show that the performance of this antenna can meet the actual use needs.