一款适用于5G通信频段的限幅滤波结构的设计

本文设计了一款新型的、工作于5G移动通信频段的限幅滤波一体化结构,其适用于射频前端,具有良好的电磁防护功能。该结构通过将限幅滤波两个模块进行一体化设计,避免了模块之间匹配网络的构建,实现了电路体积的减小。相较于传统的铁氧体频率选择限幅器,该结构在目标频段实现了宽跨度、大功率容量的特点。测试结果表明:在2.55~2.65 GHz频带内,该结构的插入损耗小于1.8 dB,限幅电平约为7.5 dBm;在4.8~4.9 GHz频带内,该结构的插入损耗小于2 dB,限幅电平约为2.5 dBm。在所选频带外,泄露功率被衰减到可忽略不计。因此,本文所设计的结构在保护敏感元件的同时可以有效提高射频前端接收机的灵敏度。

Design of An Integrated Structure of Limiting And Filtering For 5G Communication Frequency Bands

This paper designs a new integrated structure of limiting and filtering that works in the 5G mobile communication frequency band, which is suitable for RF front-end and has good point-to-point protection. By integrating the two modules of limiting and filtering, the structure avoids the construction of a matching network between the modules and reduces the circuit volume. Compared with the traditional ferrite frequency selective limiter, the structure achieves the characteristics of wide span and high power capacity in the target frequency band. The test results show that: in the 2.55-2.65GHz frequency band, the insertion loss of the structure is less than 1.8dB, and the clipping level is about 7.5dBm; in the 4.8-4.9GHz frequency band, the insertion loss of the structure is less than 2dB, and the clipping level is less than 2dB. About 2.5dBm. Outside the selected frequency band, the leakage power is attenuated to be negligible. Therefore, the structure designed in this paper can effectively improve the sensitivity of the RF front-end receiver while protecting the sensitive components.