Research On High Temperature Superconducting Frequency Dispenser

As the first component of the channelized receiver,the performance and state of the frequency distributor directly affect the signal interception rate,frequency selection ability and sensitivity of the channelized receiver.The frequency distributor made of traditional materials has a large insertion loss and low channel isolation,which leads to serious signal interference between channels,and with the increase of receiver operating frequency,the performance of the traditional frequency distributor decreases rapidly.The frequency distributor designed by high temperature superconducting material can improve the comprehensive performance of the receiver.In this paper,the following research is carried out on how to optimize the performance of high temperature superconducting frequency distributor and expand the number of channels:1.A parallel-coupled broadband frequency distributor is designed based on the image parameter method.Firstly,the method of designing filters based on normalized prototypes and two microband line transformation methods are introduced.Secondly,a two-channel frequency distributor with a bandwidth of 500MHz is designed with a reduced dual-terminal matching network,which operates at 2.0-3.0GHz and has an in-band insertion loss peak of only ldB.2.The four-channel frequency distributor of U-type card and card comb structure is designed with the "T-branch and transmission line" matching network,with a working band of 2.0-2.8GHz,a single-channel bandwidth of 200MHz,and a insertion loss of less than-1dB,and a return loss of more than 25dB.The comparison shows that the U-type card frequency distributor is simple in design,with a steep edge,and achieves good performance,which can be miniaturized.3.The application of cross-type branch combined with T-branch and transmission line to form a comprehensive matching network,designed three channels continuous frequency distributor,to achieve the expansion of the number of channels.First of all,a three-channel frequency distributor based on a matching network is designed,which provides an effective method for the design of singular channels to achieve good performance,the insertion loss is within-1dB,the channel side is very steep,the rectangular coefficient is less than 1.1,and there is no excess harmonic and transmission zero point.Secondly,the number of channels is expanded,the four-and five-channel frequency distributor is designed,the minimum insertion loss is 0.03dB,the isolation degree is higher than 20dB,and the band-out suppression peak is raised to 40dB.At the same time,based on the three-section second-class ultra-broadband machine design 16 channel narrow band frequency distributor,the comparison shows that the frequency divider based on the function divider design increases the number of channels,increases the insertion loss,and the frequency distributor insertion loss based on the matching network is small,easy to expand the number of channels.In summary,this paper provides an effective method for the design of high temperature superconducting frequency distributor,and realizes the optimization of the new energy of the receiver and the expansion of the number of channels.In the development of electronic equipment is of great significance,can be widely referenced and applied.