無線通信系統(tǒng)中無源關(guān)鍵技術(shù)研究
[Abstract]:This paper mainly studies the non-source key technology in wireless communication system. A method for determining filter order number and transmission zero position by optimization algorithm is presented. Meanwhile, a two-mode and multi-mode band pass filter, a Wilkinson power splitter with filtering characteristics, a multi-layer substrate integrated wave splitter are also studied and designed. a substrate integrated waveguide work splitter with filtering characteristics and a microstrip square waveguide coaxial probe transition. The main contents of this paper are as follows: Firstly, based on the optimization theory, a method of determining the order number and the transmission zero position of the generalized Chefs filter satisfying the requirement of the filter amplitude index is proposed. By modifying the proposed optimization objective function, the method is extended to the order number of the self-equalization filter and the position of the transmission zero point. The validity and superiority of the method are verified by several application examples. Compared with the results given by reference, the filter obtained by the method has the advantages of low order number and good external suppression effect. Secondly, the equivalent circuit of the short-circuit branch-load resonator and the open-circuit branch-loaded resonator are analyzed and summarized respectively, and the characteristic of zero-crossing distribution of the branch-section loading type filter is summarized. A four-mode filter and a dual-mode double-pass filter are designed by using the short-circuit branch-load resonator, and the external transmission zeros are directly coupled between the source and the load to improve the band-out transmission characteristic of the filter. An open-circuit branch-loaded dual-mode resonator is proposed. The resonator can adjust the resonant frequency without changing the peripheral dimension of the resonator, and the dual-mode bandpass filter is designed by using the resonator. Two types of three-mode resonators are designed by changing the load mode of branch sections, and three-mode filters are respectively designed and processed by using these three-mode resonators. The designed filter has the advantages of small volume, wide band width, high band rejection and the like. Thirdly, a Wilkinson power divider with filter characteristics is proposed by replacing a quarter-wavelength impedance transformer in the Wilkinson power splitter with a filter. On the basis of the design idea, a two-mode, three-mode filter power divider is designed and processed, and the correctness of the design method is verified. The designed filter power divider has the characteristics of filter and work divider, which can effectively reduce the size of the system. Fourth, a multi-layer substrate integrated waveguide four-function splitter is proposed, which has the advantages of small size, simple design, two paths of output identical phases, two paths of output out of phase, which can be applied in the design of power synthesis and antenna feed network, etc. and multi-layer circuit processes such as LTCC and the like can be adopted for processing. fifthly, combining the high-pass characteristic of the substrate integrated waveguide and the low-pass characteristic of the defect, a substrate integrated waveguide work splitter with the filtering characteristic is proposed, the adjustment of the lower stop band frequency can be realized by changing the equivalent width of the substrate integrated waveguide, changing the size of the defect ground structure can adjust the upper stop band frequency so that the filtering bandwidth can be flexibly adjusted to meet different engineering requirements. The designed filtering power divider has the advantages of small volume, easy integration with planar circuit and the like. Finally, based on the coaxial probe coupling, the transition structure of Ka-band microstrip transmission waveguide is designed, and the equivalent circuit of the transition structure is extracted, and the correctness of the extracted equivalent circuit is proved by simulation and field simulation. finally, the coaxial probe transition structure in both the parallel and vertical directions of the waveguide and the microstrip is designed through field simulation; the structure has the advantages of compact structure, wide frequency band and good sealing; and the waveguide output port can rotate coaxially with the coaxial probe, and can meet the requirements of different polarization directions of the waveguide ports in practical engineering.
【學位授予單位】:電子科技大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:TN713
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