大功率高相位稳定性P波段铁氧体环行器研制

Development of P-band ferrite circulator with high power and high phase stability

针对应用于P波段大功率微波成像系统的大功率环行器传输相位稳定性的严格要求,分析了大功率环行器电气性能,建立了P波段大功率环行器HFSS仿真模型,并结合ANSYS热力学软件进行了热、电、磁等多物理场分析。结果表明,器件在大功率状态下铁氧体材料饱和磁化强度随温度的变化是影响其传输相位稳定性的关键因素。据此提出了器件对铁氧体材料饱和磁化强度在实际工作条件下(20～40℃)的具体性能要求,优化设计了满足系统需要的P波段大功率环行器,并实验测试了优化后器件在高功率状态下的性能。测试结果表明,其传输相位变化由±7°缩小到±3°,测试结果与理论分析相吻合。

Aiming at the strict requirement for transmission phase stability of high-power circulator used in P-band high-power microwave imaging system, the electrical performance of high-power circulator is analyzed, and the HFSS simulation model of P-band high-power circulator established. Combined with ANSYS thermodynamics software, the thermal, electrical, and magnetic fields are analyzed, and the result is obtained that the change of saturated magnetization with temperature is the key factor affecting the phase stability of ferrite at high power. Based on this, the specific perfonnance requirements of the device for saturated magnetization of feMte materials under actual operating conditions （20 to 40 ~C） are proposed. The P-band high-power circulator which meets the system requirements is designed. The performance of the optimized device under high-power condition is tested experimentally. The test results show that the transmission phase stability is improved from ±7° to ±3°, and the test results are in agreement with the theoretical analysis.