摘要
军用宽频段通信系统通常配置跳频滤波器以获得更好的抗干扰性能。这类系统的射频前端在发射时,易产生异常杂散。在大功率工作时,整机功率平坦度变差、定向耦合器产生额外谐波能量、跳频滤波器不仅表现为谐波抑制能力下降,还将导致邻信道功率比恶化。文中通过分析射频前端各模块级联后相互间的影响,以及各模块在通过大功率时特性的改变来阐明上述问题的原因,提出了相应的解决措施,这些措施在工程实践中已得到了有效应用。
In military wide frequency range communication systems, the frequency - hopping filters are used to improve the anti - EMI features. The RF front - end of such systems will probably produce Abnormal Spur while transmitting RF signals. In high power mode, such RF front -end will result in deterioration of RF power flatness. The harmonic energy will he raised by directional coupler. The harmonic suppression of the frequency - hopping fil- ters will be weeken, and the ACPR of the RF signal will degrade because of frequency hopping filters. In this article, the interaction between the different modules in RF front end while connecting them together, and the characteristic change of the modules in high power mode are analysed to explain the reasons for the problems above. In the end, the corresponding solutions are presented, which have been applied in engineering practice.
出处
《电子科技》
2017年第9期156-158,共3页
Electronic Science and Technology
