单波束相控阵雷达中放大器阻抗调谐的作用距离改进
Range Improvement in Single-Beam Phased Array Radars by Amplifier Impedance Tuning
摘要：
由于阵列扫描角度的变化，天线阻抗会发生变化，从而导致雷达作用距离显著降低。元件级可重构阻抗调谐器可用于最佳匹配功率放大器器件;然而，阻抗匹配也会影响阵列方向图。本文研究了阵元阻抗调谐对发射功率和阵列方向图的影响，提出了一种阵元阻抗调谐器的实现方法。通过仿真给出了开关短截线阻抗调谐器对阵列方向图和发射功率影响的实例。作为这些实验的结果，指导方针的开发，为创建实时电路优化技术的阵列元件。
英文摘要：
Significant radar range degradation can be incurred due to variations in antenna impedance from changing array scan angle. Element-wise reconfigurable impedance tuners can be used to optimally match the power amplifier device; however, the impedance matching can also affect the array pattern. In this paper, the effects of element-wise impedance tuning on the transmitted power and on the array pattern are studied, and an approach is recommended for the element-wise implementation of impedance tuners. Examples of impact on array pattern and transmitted power are given using simulation of a designed switched-stub impedance tuner. As a result of these experiments, guidelines are developed for the creation of real-time circuit optimization techniques in the array elements.
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