数字阵列天线宽带辐射方向图综合技术

Synthetic Technology of Wideband Radiation Pattern Based on Digital Array Antenna

针对采用数字中频的多通道阵列天线的宽带信号辐射能力展开了研究。介绍的数字阵列天线宽带辐射方向图综合技术,其主要创新点是宽带辐射方向图计算方法的理论推导,并对其在频域取平均,用于衡量其副瓣电平。在详细介绍数字阵发射的宽带辐射场计算方法的基础上,通过仿真对多通道数字中频系统的宽带辐射方向图进行计算。本文研究的数字阵列天线,其阵面是工作在8 GHz的矩形网格平面微带天线阵,宽带信号是经线性调频信号调制的二进制相移键控(BPSK)编码信号,不同通道发射不同的基带信号,对宽带发射波束进行了分析,论证了基于数字阵列天线的宽带发射波束形成的有效性。

In this paper,the radiation capability of broadband signals using digital intermediate frequency(IF)multi-channel array antenna is studied.For the wideband pattern synthesis technology of the digital array antenna introduced in this paper,the main advantage and contribution is the theoretical eduction of the calculation method for broadband radiation pattern,and the even value in frequency domain is gained,which is applied to weigh the side-lobe level.Based on the detailed introduction of the calculation method of broadband radiation field transmitted from digital array,the broadband radiation pattern in multi-channel digital IF system is calculated through simulation.For the digital array antenna studied in this paper,the array is planar microstrip antenna array of rectangular grid in 8 GHz,the broadband signal is binary phase shift keying(BPSK)signal modulated by linear frequency modulation(FM)signal,different baseband signals are transmitted in different channels.The broadband transmitting beam is analyzed,and the validity of broad transmitting beam forming based on digital array antenna is demonstrated.