Design Of The High-Performance Multiplexer Of Point Of Interface

Nowadays,the development of communication technology is changing from month to month.The Polar Code program of Huawei becomes the final plan of 5G control channel eMBB?Enhanced Mobile Broadband?scenario coding after the competition from Europe and the United States enterprises in November 2016.The 4G communication has been fully popular in almost all cities and the frequency of communication is increasing highly,the frequency bands is increasing egmentation.Communication system has gradually varied,for instance,3G CDMA and 4G TD-LTE.In order to achieve the uplink and downlink signals of the various communication bands,the indoor communication distribution system becomes more and more complicated,and many times the repeated construction of the respective operators to establish their own coverage system exacerbates this situation.Therefore,the design and popularization of Point Of Interface?POI?is necessary,and the key of POI design is of great significance.After the middle of 20^th centry,the study of Multi-frequency combiner design had begun.limited by the theory,the development of computer technology and other related factors,the thudy was gradually mature in recent years.With the filter in parallel,we can design a combination of road and select structure flexibly to achieve the design targets.The main work of this paper is to design a five-way combiner with high performance and structural requirements such as isolation,low insertion loss and high out-of-band suppression.Multi-frequency combiner can be decomposed into several single-passband filter structure.Therefore,this paper first introduces the theoretical part of basic part-filter,and focuses on the generalized Chebyshev filter and cross coupling Matrix analysis to provide theoretical support for the subsequent design of complex structure filter,and also discusses the coupling coefficient formula with the simulation software HFSS.Then the paper will discuss the simulation of single and double cavity resonant frequency and coupling coefficient,and analyze the impacts on the performance of the filter in the actual design.In particular,the application of more CT and CQ cross coupling and port coupling structure will have an effect on the performance.Subsequently,the paper discuss the Y matrix method which is widely used in the design process to adjust the resonance and coupling.Then the paper determine the topology and extract the initial coupling matrix from coupleFila to the two-dimensional software AWR circuit model simulation according to our software simulation design ideas,and then makes models in HFSS to design combiner,and finally the overall simulation.In the process,the paper also focuses on the introduction of the cavity structure and the introduction of the public cavity to reduce the number of joint-side taps and the volume of the combiner,simplify processing,reduce the interaction between the passages.The last link is processing test to get the design of high-performance combiner.