Range Improvement in Single-Beam Phased Array Radars by Amplifier Impedance Tuning
2021 IEEE Texas Symposium on Wireless and Microwave Circuits and Systems (WMCS)(2021)
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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关键词
cognitive radar,power amplifiers,radar phased array beamforming,radio spectrum management,reconfigurable circuits
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