Research On The Performance Of Two-dimensional Photonic Crystal RF Filter Based On AAH Cavity

With the continuous development of wireless communication applications,the spectrum resources are becoming increasingly tight.The demand for information capacity and information transmission quality shows an explosive growth trend,and higher requirements are placed on the performance of filters in microwave/RF devices.Due to the continuous expansion of the frequency band of radio frequency signals to high frequency bands,traditional radio frequency filters have been unable to meet the growing business needs.Therefore,it is of great significance to design a new type of RF filter and realize the application of such microwave/RF devices in various backgrounds such as multi-band and ultra-wideband.Photonic crystal devices have advantages over electronic devices in processing high-frequency signals.Because of their large operating bandwidth,low transmission loss,and electromagnetic interference resistance,they have become a research hotspot in recent years.Therefore,the research on RF filters based on photonic crystals has important application value.This paper presents a novel RF band-stop filter based on two-dimensional photonic crystals.Firstly,the lattice structure and the design of line-defect waveguides are analyzed,and then the effects of different resonators on the device performance are discussed.Next,the influence of structural parameters on the performance of the filter was studied,and three resonator filters with different lattice mismatch parameters were designed.The results show that the center wavelength of the stop band is 1668.3?m,the stop band attenuation is 30d B,the pass band insertion loss is 0.04d B,the stop band 3d B bandwidth is 0.01?m,and the quality factor Q value is 1.5×10~4,which further improves the filtering.The ability of the device to suppress the noise outside the high frequency band.Based on the principle of the two-color cavity of Aubry-André-Harper model,this paper also proposes a new type of RF bandpass filter based on two-dimensional photonic crystal.Firstly,the filter performance of the filter is analyzed.Then,the structural parameters of the device are optimized and analyzed.Three resonant cavity filters with different lattice mismatch parameters are designed.The results show that the filter has excellent performance,the center wavelength of the passband is1666?m,the transmittance is 0.99,the passband insertion loss is 0.06d B,the quality factor Q value is 1×10~4 the device size is small,the structure is simple,Easy to integrate,has important applications in ultra-wideband communication systems.