一种高隔离度双频收发模块的设计与实现

Design and implementation of high-isolation dual-band transceiving module

文中从非线性理论的角度出发,阐述在宽带接收机中虚假信号的产生和对接收模块的影响,并设计一种双频段收发模块。该收发模块同时工作在S频段和X频段,发射大信号和接收小信号同时存在。为了避免S频段发射大信号对X频段接收小信号的影响,忽略单一频段收发子模块的详细设计,从分机的角度阐述在同时存在大小信号的条件下如何设计可以提高模块的隔离度。其次,采用模块化设计方法、独立的电源供电和结构分腔,在一个模块内部同时实现大动态范围的S波段和X波段信号的发射和接收。通过对产品的调试和测试得出,在输出功率大于40 dBm的条件下,S频带发射机和X频带接收机之间的隔离度大于110 dB,满足指标要求。测试结果表明,所设计的双频段收发模块可广泛应用于电子侦察干扰领域,具有重要的工程意义。

From the perspective of nonlinear theory,the generation of spurious signals in broadband receivers and their impact on the receiving module are expounded,and a dual-band transceiving module is designed.The transceiving module can work simultaneously in both S-band and X-band,transmitting large signals and receiving small signals at the same time.In order to avoid the impact of transmitting large signals in S-band on receiving small signals in X-band,the detailed design of single band transceiving sub module is ignored,and how to design to improve the isolation of the module in the case of large signals and small signals existing at the same time is described from the perspective of the unit.By means of the modular design approach,independent power supply and structural split cavity,the transmission and reception of S-band and X-band signals with large dynamic range are realized simultaneously within one module.The debugging and testing results of the product show that the isolation between S-band transmitter and X-band receiver is greater than 110 dB under the condition that the output power is greater than 40 dBm,which can meet the index requirements.The testing results show that the designed dual-band transceiving module can be widely used in the fields of electronic reconnaissance and jamming,which has a important engineering significance.