The Designing Of The High Temperature Superconductor In Extreme Parameter

This thesis reports the research work on design and fabrication of high temperature superconductor(HTS)filters,especially on the design and test of HTS filters with high frequency,low frequency,ultra-wide band and ultra-narrow band.Firstly,taking the first filter the author designed as an example,the thesis introduces the procedure used to design an HTS filter and the difficulties we might meet when designing the filter.Then the author introduces two kinds of ultra-narrow band HTS filters designed during the postgraduate study.The first filter worked in UHF band,and an U-shape structure was designed to reduce the coupling of resonators and to save space at the same time.Finally,we designed a ten order quasi-elliptic function filter on a 43×16 mm~2 substrate,with the relative bandwidth of 0.068%.After designing the filter in UHF band,the author designed an ultra-narrow band HTS filter in VHF band.In this filter,the author changed the layout of resonators,by rearranging the 8 resonators into two lines.In this way,we fabricated this VHF band filter on a 38×38 mm~2 HTS substrate and introduced two transmission zeroes on both sides of the passband.The relative bandwidth of the filter reached 0.039%.Meanwhile the out of band rejection was better than-50 dB.Except for the ultra-narrow band filters,we also conducted some interesting researches on wide band filters.Here we introduced two filters working at extreme frequencies.The first one was an X-band wide band filter with relative bandwidth of40%.In this filter,we directly connected the input/output microstrip line with the first resonator of the filter to guarantee the external quality factor.The value of the external quality factor was controlled by tuning the relatively position of the input/output line with respect to the resonator.The second filter worked in VHF band and was designed with quarter-wave resonators.A square structure was introduced to substitute the ground.The relative bandwidth of this filter was up to 42.8%.In the design of the wide band filter,the author found two difficulties in the design of the wide band filter at relatively low frequency.The first difficulty is the size problem,and the second is the strong coupling the wide band filter requires.To solving these problems,the author designed a filter system with a high pass filter and a low pass filter.The relative bandwidth of this filter system was over 108%.Except for the filters in extremely bandwidth,we also designed a filter in Ku band,targeting at the applications of HTS filters to the civil use of wireless communication with increasingly higher frequencies.At the end of the thesis,the author reports his earlier work on perovskite solar cells,focusing on the preparation of high efficiency perovskite solar cells by using spray system.