T/R组件阻抗失配对相控阵天线性能的影响

T/R 组件为满足低剖面的设计要求,收发开关一般采用集成度较高的单刀双掷(SPDT)开关设计方案,然而有源相控阵天线大角度扫描时随着有源电压驻波比的增大,会导致T/R 组件与天线辐射单元阻抗失配。文中分析了该阻抗失配问题,并对采用SPDT 开关的T/R 组件进行了阻抗失配实验,从发射输出峰值功率、组件发射效率、发射通道相位三个方面定量分析了T/R 组件输出端口阻抗失配对发射性能的影响,并将该T/R 组件应用于有源相控阵天线,通过测试等效全向辐射功率(EIRP)进一步讨论其影响。

Influence of T/ R Module Impedance Mismatch on the Performance of Phased Array Antenna

In order to meet the design requirements of low profile, the transceiver switch in T/R module generally adopts the design of single pole double throw (SPDT) switch with high integration. When the active voltage standing wave ratio increases with the increase of the scanning angle of the active phased array antenna, the impedance mismatch between T/R module and antenna radiation element will inevitably occur in active phased array antenna that applies SPDT switch in T/R modules. In this paper, the impedance mismatch problem is analyzed by impedance deflection experiment of T/R module, the transmitting output peak power, transmission efficiency and transmission channel phase of the module are quantitatively presented and discussed, showing the influence of T/ R module impedance mismatch on emission performance. The T/R modules are applied in an active phased array antenna, and its influence is further discussed by testing EIRP.