宽带大功率超短波射频通道测试系统设计

Design of Broadband High Power Ultra-Short Wave RF Channel Test System

摘要:

文章根据机载超短波射频通道的性能检测需求,设计了一个射频通道测试系统,可通过无线方式来实现对射频功率等参数的检测。首先,设计了小型化宽带检测天线,利用有限元法计算出其输入阻抗后,利用“化场为路”的方法,并结合微波网络理论、电路理论计算了其传输特性；然后,采用全波分析和微波理论相结合的混合法计算了空间衰减；最后,将空间衰减和检测天线传输特性相结合,分析了射频通道的功率传输特性。在没有对实验系统进行校准的情况下,实测结果与理论结果依然达到了较高的吻合度,表明使用该测试系统可以在宽频带、大功率情况下方便、可靠地实现对射频通道的性能检测。

Abstract:

According to the performance detection requirements of airborne ultrashort wave RF channel, in this paper, anRF channel test system was designed, which could detect the parameters such as RF power through wireless. Firstly, a min.iaturized broadband detection antenna was designed. After calculating its input impedance by finite element method, thetransmission characteristics were calculated by using the method of“converting electric field into circuit”and combiningwith microwave network theory and circuit theory .Then the spatial attenuation was calculated by the hybrid method com.bining full wave analysis and microwave theory. Finally, the spatial attenuation and the detection antenna transmissioncharacteristics were combined to analyze the power transmission characteristics of the RF channel. In the absence of cali.bration of the experimental system, the experimental test results and the theoretical results still reached a high degree ofagreement. It shows that the test system can perform the performance detection of the RF channel conveniently and reli.ably under the condition of wide frequency band and high power.