Design And Realization Of 30-512MHz Frequency-Hopping Filter Module

The development of electronic technology makes signal processing and wireless communications is becoming increasingly popular. It also makes wireless communications become an important way in people`s daily life. Nowadays communication systems are faced with the increasingly complex electromagnetic environment. This requires receivers would be able to face more complex demanding environmental requirements. Hopping radio Receivers as an important part of communications carrier must possess superior anti-interference ability and adaptability. Hopping filter components can have a multi-frequency in the UHF / VHF frequency range. In order to save resources, communications equipment, improve the spectrum efficiency.The filter constituted by the selected frequency components compared to the fixed frequency filter will more sensitive influence on the couple. Thus, finding the relationship between them will benefit the tunable filter design and production.In this paper, we explored the relationship between the state and the effects of coupling with the tunable filter. And examined the major factor of the state in the hopping environment. we studied the close influence in the system state changes caused by the coupling.Designed the 30-512 MHz tunable filter with 2.5%-4.5% frequency bandwidth according to the summary of conclusions. Entire module within 30-512 MHz frequency satisfied the following requirements: the output gain keep a flatness of 11.6±2.0dB.Band rejection at(1±10%)f0 is no less than 38 d B.The output VSWR is lower than 2.0.The linear working input-power is above +1.0dBm.The maximum input power reaches the requirement of +38dBm.The result indicates that these principles have made us avoid running into wrong direction in the implementation of such a module and enhanced the performance a lot of the module.