一种应用于5G通信的无反射滤波器设计

A reflectionless filter design for 5G communication

为了解决通信电路中“信号反射”的问题,提出了一种无反射陷波电路,用于“吸收”通信电路中特定频点处的微波信号。通过级联无反射陷波电路改善了现有吸收式滤波器的阻带抑制与吸收效率。采用砷化镓IPD工艺对电路进行版图设计,最终得到的器件版图尺寸仅有800μm×500μm×87.71μm,1500μm×500μm×87.71μm。版图仿真结果表明,基于砷化镓IPD工艺设计的无反射陷波滤波器能够有效吸收特定频率的微波信号,滤波器回波损耗始终大于12.5 dB,平均吸收效率达到90%以上。改进后的无反射低通滤波器,在DC-3.5 GHz频段内插入损耗小于2.5 dB,在1.4倍截至频率处插入损耗达到20 dB,在1.7倍截至频率处插入损耗达到40 dB,具有良好的带外抑制性能。在反射信号吸收方面,DC-7.5 GHz频率范围内,滤波器的回波损耗始终大于15 dB,反射信号吸收效率高达95%以上。

In order to solve the problem of"signal reflection"in the communication circuit,this paper designs a reflectionless notch filter to"absorb"the microwave signal at a specific frequency point,and improved the stopband performance and absorption efficiency of the existing reflectionless low-pass filter by cascating reflectionless notch filter.Using the GaAs IPD process to design the layout,the layout size of the devices is only 800μm×500μm×87.71μm,1500μm×500μm×87.71μm.The layout simulation results show that the reflectionless notch filter can effectively absorb microwave signals in specific frequency,the average absorption efficiency of more than 90%.The improved reflectionless low-pass filter has a good stopband performance,and the insertion loss of less than 2.5 dB in the DC-3.5 GHz frequency band,the insertion loss of 20 dB at 1.4 times the cutoff frequency and the insertion loss of 40 dB at 1.7 times the cutoff frequency.In terms of stopband signal absorption,within the frequency range of DC-7.5 GHz,the return loss of the filter is always greater than 15 dB,and the absorption efficiency of the reflected signal is more than 95%.