Broadband Circulator With High Performance Filter Simulation And Preparation

With the continuous development of information technology, the high developmentspeed of microwave communication systems in the field of telecommunication ishighlighted particularly. Microwave duplexer and multiplexer are important componentsin telecommunication systems, they are mainly used to achieve the following problems:first, solve the system frequency congestion problems, and can satisfy the multi channelreal time two-way communication; second, making transceiver channels sharing oneantenna possible. For these requirements, we need to design components which couldmulti channel synthesis and separation.In this paper, we studied the component of duplexer and multiplexer, the ferritecirculator and band-pass filter, for example, we studied the design of the S bandbroadband high power circulator and high performance band-pass filter, usingprofessional computer aided design software, and developed good performancecomponents to meet the system requirements. High performance band-pass filters usecoaxial cavity structure, this structure has characteristics such as high power capacity,low insertion loss and spurious band far from central frequency. Combining withbroadband high power circulator, the band pass filter can realize high powertransmission. In addition, these two components can also be used in telecommunicationsystems separately, because of their excellent performance, large power capacity andbroad bandwidth, these two components were widely used.For the development requirement of broadband circulator and high performancefilter in this paper, the following work has been done:(1) Researching on the strip line circulator basic theories, focuing on the aspectsthat influence the bandwidth of stripline circulators, introduces the basic characteristicsof ferrite magnetic material used in circulators. This paper studies how to properlyselect materials for circulator.(2) Through the analysis by electromagnetic simulation software HFSS, this paperfixed several key figures which could affect the performance of the components, then using optimize computation, to achieve the planned goal. SolidWorks is then used todesign the structure of the components, increasing the power capacity and stability.(3) In the design of band-pass filter, we combine the low pass filter andGeneralized Chebyshev combline band-pass filter, realizes the band-pass filters of broadstop-band requirements. The design process is similar with the circulator design process,first introduced the basic theory of generalized Chebyshev filter, then analyzed itscoupling, topology structure.(4) Based on the theory, combined with the simulation software, we concluded thefilter structure and size, development and debugging the band-pass filter that can meetthe requirement of performance, and the filter can achieve high proximal inhibition andwide stop-band requirements.