有源相控阵天线收发隔离度计算方法

Transmitter-Receiver Isolation Calculating Method of Active Phased Array Antennas

提出了一种全双工有源相控阵天线射频链路系统收发隔离度的计算方法。基于微波网络理论,首先针对发射工作频率提取出发射天线阵面到接收天线阵面的耦合传输矩阵,计算出耦合到接收相控阵系统射频链路里的信号功率,其值必须小于低噪声放大器的输入1 d B压缩点功率值,确定发阻滤波器的隔离度。然后针对接收工作频率提取出发射天线阵面到接收天线阵面的耦合传输矩阵,计算出从发射相控阵系统射频链路里耦合到接收天线阵面的噪声功率,其值必须小于接收相控阵系统的噪底,确定收阻滤波器的隔离度。最后研制了全双工有源相控阵天线原理样机并进行了测试,在与目标对接试验中,全双工有源相控阵天线工作时无失锁现象,接收通道能正常工作,验证了提出方法的正确性。

A transmitter- receiver isolation calculating method of full- duplex active phased array RF- link system is proposed.Based on microwave network theory,the coupling transmitting matrix is firstly obtained from transmitting array to receiving array in the transmitting operating frequency,and signal power that is coupled to receiving phased array RF-link system is calculated. The isolation of transmitting restraining filter is determined in view of the calculated signal power value less than the inputting 1d B compressing power value of low noise amplifier. And then the coupling transmitting matrix of receiving array is obtained from transmitting array to receiving array in the receiving operating frequency,the noise power which comes from transmitting phased array RF-link system is computed. The isolation of receiving restraining filter is determined as a result of the calculated noise power value less than the noise floor of receiving phased array. Finally,the prototype is manufactured and measured. Through transmitting-receiving experimentation,it shows that active phased array has no lose lock when it works,and receiving RF-link system works well,and corresponding measured results demonstrate the proposed method＇s validity.